JP2018196733A - Method and apparatus for three-dimensional oral cavity measurement - Google Patents

Abstract

To provide a three-dimensional oral cavity measurement apparatus capable of accurately three-dimensionally measuring a wide-range measurement range in an oral cavity that is a narrow space, an oral cavity three-dimensional measurement method, and a display method for a three-dimensional oral cavity measurement result.SOLUTION: A three-dimensional oral cavity measurement method includes: a wide-range three-dimensional measurement information acquisition step (a step s1) of acquiring wide-range three-dimensional measurement information acquired by measuring a wide-range shape in a desired measurement range in the oral cavity; a narrow-range three-dimensional measurement information acquisition step (a step s2) of acquiring a plurality of pieces of narrow-range three-dimensional measurement information acquired by measuring a narrow-range three-dimensional shape that is narrower than the wide range in the measurement range; and a synthetic three-dimensional information creation step (a step s3) of disposing the narrow-range three-dimensional measurement information on the basis of the wide-range three-dimensional measurement information using common measurement-range position information in the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information, as a synthesis reference.SELECTED DRAWING: Figure 3

Description

  For example, an intraoral 3D measurement device and an intraoral 3D measurement method for imaging light irradiated toward a measurement target in the oral cavity such as a tooth, and performing image analysis processing to measure the three-dimensional shape of the measurement target The present invention also relates to a method for displaying intraoral three-dimensional measurement results.

  For example, there are measuring apparatuses and measuring methods for measuring a three-dimensional shape of a measuring object by various methods such as a light cutting method, a focusing method, a spatial code method, a phase shift method, a stereo method, a photogrammetry method, and a SLAM method. Proposed and implemented. For example, in the shape measuring device of Patent Document 1, projection light that has passed through a lattice pattern plate is projected onto a measurement object as light having a lattice shape, and reflected light of the projection light having the lattice shape projected onto the measurement object is reflected. It is an apparatus that can measure a three-dimensional shape of a measurement target based on a captured image. Further, in recent dental treatments, the three-dimensional shape of the dentition is measured by using the shape measuring device, and applied to artificial teeth and prosthesis design.

  However, for example, the measuring device Z as in Patent Document 1 cannot measure a wide measuring range in a narrow space such as the entire dental arch Da in the oral cavity at a time. This is because the dentition, which is the subject, has a complicated shape, and many blind spots are generated just by taking a single image, and the three-dimensional data is lost.

  For this reason, for example, it is necessary to divide the measurement into the following procedures. As shown in FIG. 11 (a), a narrow range Rn that is a part of the measurement target is measured (hereinafter referred to as narrow range measurement), and adjacent narrow ranges can be covered so that the entire measurement target can be covered. Each measurement is performed a plurality of times so as to include an overlapping portion Rr (hereinafter referred to as an overlapping portion) (see FIG. 11B). Then, as shown in FIG. 11C, adjacent narrow range measurement results In ′ are connected based on the overlap location Rr in each narrow range measurement result (referred to as narrow range measurement result In ′), and a wide range of measurements are performed. A measurement result (overall measurement result Ic ′) of the entire object is obtained.

  However, in this way, in the wide range of overall measurement results Ic ′ formed by sequentially connecting the adjacent narrow range measurement results In ′ based on the overlap location Rr, as shown in FIG. Even if the range measurement result In ′ is slightly connected, an error is generated, and the error is accumulated by sequentially connecting the entire measurement target, so that a large error may occur as the overall measurement result Ic ′.

JP 2011-242178 A

  Therefore, the present invention provides an intraoral 3D measuring device, an intraoral 3D measuring method, and an intraoral 3D measurement result display method capable of accurately measuring a wide range of measurement in the oral cavity which is a narrow space. The purpose is to do.

  The present invention provides a wide-range three-dimensional measurement information acquisition step of acquiring wide-range three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a narrow-range three-dimensional shape narrower than the wide range in the measurement range. The narrow range 3D measurement information acquisition step for acquiring a plurality of measured narrow range 3D measurement information, and the wide range 3D measurement information and the position information in the measurement range common to the narrow range 3D measurement information as a synthesis reference It is an intraoral 3D measurement method that performs a combined 3D information creation step of arranging the narrow range 3D measurement information based on a wide range of 3D measurement information and creating composite 3D information of the measurement range. Features.

  In addition, the present invention acquires wide-range three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a plurality of narrow-range three-dimensional measurement information obtained by measuring a narrow three-dimensional shape that is narrower than the wide range. A measurement information acquisition unit that performs the narrow-range three-dimensional measurement information based on the wide-range three-dimensional measurement information based on a combination reference of the position information in the measurement range common to the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information. An intraoral three-dimensional measuring device provided with a synthetic three-dimensional information creating unit that arranges and creates synthetic three-dimensional information of the measurement range.

  The above-described wide range in the desired measurement range may be the entire desired measurement range, or may be a part of the desired measurement range, may be a range wider than the above-described narrow range, As a whole measurement range formed by joining a plurality of 3D measurement information that is a part of the measurement range, narrower than the above-mentioned wide range, and wider than the above-mentioned narrow range at overlapping portions in each 3D measurement information Also good.

Further, the measurement range can be the entire dental arch including the gingiva in the oral cavity, a predetermined region in the dental arch, or the entire edentulous jaw or a part thereof.
The above-mentioned wide-range three-dimensional measurement information, narrow-range three-dimensional measurement information, and synthetic three-dimensional information can be numerical information such as spatial coordinate information, texture direction vector information, measurement value reliability information, and image information.

According to the present invention, it is possible to accurately three-dimensionally measure a wide range of measurement objects in the oral cavity, which is a narrow space.
More specifically, according to the method described above, a wide range of three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a plurality of measurements of a three-dimensional shape of a narrow range narrower than the wide range in the measurement range. Narrow-range three-dimensional measurement information is acquired, and the narrow-range three-dimensional measurement based on the wide-range three-dimensional measurement information using the common information in the measurement range in the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information as a synthesis reference Since the measurement information is arranged and the synthetic three-dimensional information of the measurement range is created, it can be the synthetic three-dimensional information of the measurement range composed of the narrow-range three-dimensional measurement information based on the wide-range three-dimensional measurement information. Accumulation of errors does not occur, and the entire measurement range can be accurately three-dimensionally measured.

  As an aspect of the present invention, the wide-range three-dimensional measurement information is composed of wide-range three-dimensional image information obtained by measuring the wide-range three-dimensional shape and imaging the narrow-range three-dimensional measurement information. It is composed of narrow-range three-dimensional image information obtained by imaging the measurement result, and in the synthetic three-dimensional information creation step, synthetic three-dimensional image information imaged based on the synthetic three-dimensional information can be created.

Alternatively, the combined three-dimensional information creation unit can be configured to create combined three-dimensional image information imaged based on the combined three-dimensional information.
According to the present invention, measurement information can be imaged and displayed, so that the user can operate while visually confirming the measurement state, and the operability is improved.

As an aspect of the present invention, in the narrow range three-dimensional measurement information acquisition step, the narrow range three-dimensional measurement information can be measured with higher resolution than the wide range three-dimensional measurement information.
According to the present invention, it is possible to obtain a combined three-dimensional information of a measurement range composed of high-resolution narrow-range three-dimensional measurement information based on a wide range of three-dimensional measurement information that does not accumulate errors, and the entire measurement range is highly accurate. In addition, high-resolution three-dimensional measurement is possible.

  Further, as an aspect of the present invention, in the composite 3D information creation step, the composite 3D information is obtained by using characteristic location information common to the narrow range 3D measurement information and the wide range 3D measurement information as position information within the measurement range. Can be created.

Alternatively, the composite 3D information creation unit creates the composite 3D information using characteristic location information common to the narrow range 3D measurement information and the wide range 3D measurement information as the position information in the measurement range. be able to.
According to the present invention, it is possible to create combined three-dimensional information obtained by accurately combining a plurality of narrow-range three-dimensional measurement information based on wide-range three-dimensional measurement information via feature location information.

  Further, as an aspect of the present invention, a position information acquisition step of acquiring position information of each of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information is performed, and in the composite three-dimensional information creation step, the position information acquisition step The synthesized three-dimensional information can be adjusted based on the position information acquired in (1).

  Alternatively, it includes a position information acquisition unit that acquires position information of each of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information, and the combined three-dimensional information creation unit is acquired by the position information acquisition unit. Based on the information, the combined three-dimensional information can be adjusted.

  The position information described above can be position information based on the entire position at the time of three-dimensional measurement, such as GPS, or position information based on a relative position with respect to the oral cavity, for example. Therefore, the position information acquisition unit can be a measuring device that can measure the entire position such as GPS, or a measuring device that can measure a relative position such as a position sensor. Further, the position information may be acquired using an acceleration sensor, a speed sensor, a gyro sensor, an orientation sensor, an attitude sensor, or a combination of the above various sensors.

  According to this invention, in order to adjust the synthetic three-dimensional information based on the position information of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information, more accurate and accurate synthetic three-dimensional information is created. Can do.

Further, as an aspect of the present invention, in the synthetic three-dimensional information creation step, the narrow-range three-dimensional measurement information in which measurement information in a corresponding range in the wide-range three-dimensional measurement information in which the narrow-range three-dimensional measurement information is arranged Can be overwritten.
According to the present invention, the amount of information of the combined three-dimensional information can be reduced.

As an aspect of the present invention, the wide-range three-dimensional measurement information can be total measurement information obtained by measuring the entire shape in the measurement range.
According to the present invention, a wide range of three-dimensional measurement information of the entire measurement range formed by connecting a plurality of three-dimensional measurement information narrower than a wide range and wider than the above-mentioned narrow range by overlapping portions in each three-dimensional measurement information, Compared to the case, the accumulation of errors does not occur, and more accurate combined three-dimensional information can be created.

  Further, as an aspect of the present invention, a plurality of the wide range 3D measurement information is arranged using the common wide range position information in the adjacent wide range 3D measurement information as a connection reference, and the entire combined measurement information of the entire measurement range is obtained. It is possible to perform the entire combined measurement information creation step to be created.

  According to the present invention, a plurality of the wide-range three-dimensional measurement information is arranged using the common wide-range position information in the adjacent wide-range three-dimensional measurement information as a connection reference to create the total measurement information of the entire measurement range. Even in a wider measurement range, accurate synthetic measurement information can be created.

  Further, as an aspect of the present invention, at least one of the plurality of narrow range three-dimensional measurement information is adjusted narrow range three-dimensional measurement information including measurement information in a range corresponding to the wide range position information, and the composite three-dimensional information creation An overall joint measurement information adjustment step of adjusting the overall joint measurement information based on the adjusted narrow range three-dimensional measurement information arranged in the process can be performed.

  According to the present invention, the overall combined measurement information of the entire measurement range created by arranging a plurality of the wide-range three-dimensional measurement information using the common wide-range position information in the adjacent wide-range three-dimensional measurement information as a connection reference is adjusted narrowly. Since adjustment is made based on the range 3D measurement information, the overall combined measurement information is adjusted based on clearer feature location information, so even more accurate combined measurement information can be created even in a wider measurement range. .

  Further, as an aspect of the present invention, there is provided a display method of intraoral 3D measurement results in which the wide range 3D measurement information and the narrow range 3D measurement information measured by the intraoral 3D measurement method are imaged and superimposed. It is characterized by being.

  According to the present invention, since the imaged narrow range 3D measurement information can be synthesized while being superimposed on the imaged wide range 3D measurement information, the user can visually confirm the synthesis status of the narrow range 3D measurement information. It is possible to create composite 3D information more reliably.

As an aspect of the present invention, the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information that are imaged and superimposed are displayed so that at least one of brightness, color, luminance, and display pattern is different. it can.
According to the present invention, the user can clearly recognize the narrow-range three-dimensional measurement information superimposed and displayed on the wide-range three-dimensional measurement information, and therefore can create synthesized three-dimensional information more accurately.

  As an aspect of the present invention, the measurement information acquisition unit includes a light source that irradiates the object to be measured with projection light, an image sensor that captures the irradiation field irradiated with the projection light, and reflected light from the object to be measured. Can be configured by a three-dimensional measuring instrument including a light guide path that guides light to the image sensor, a light source, the light guide path, and a housing that includes the image sensor and can be gripped.

  The light source includes various light sources such as a planar light source having a planar light emitting portion, a spot light source having a spot shape, a strip light source having a strip shape, and a single light source or an array in which a plurality of light sources are arranged. Shaped light source. The light source includes light that passes through a lens and an optical fiber, and light that is shaped using a diffusion plate, a mask, or the like. The light source may be a uniform light source that emits uniform projection light, or a structured light source that emits structured projection light such as a sine wave or checkered lattice, Both the uniform light source and the structured light source may be provided. The structured light source may include a mechanism for dynamically changing the structured pattern of projection light. The projection light may pass through the light guide path, or a light source may be arranged so as to directly irradiate the measurement object without passing through the light guide path.

For example, when the three-dimensional measurement method is based on a stereo method using a multi-lens camera, the image sensor may be composed of a plurality of image sensors, or may be based on a three-dimensional measurement method other than the stereo method. For example, a single image sensor may be used. The imaging element includes a CCD image sensor (Charge Coupled Device image sensor) using a photodiode, a CMOS image sensor (Complementary MOS image sensor), and the like.
According to the present invention, a narrow intraoral measurement range can be three-dimensionally measured with high accuracy.

  As an aspect of the present invention, the light guide path includes a wide-range light guide path for measuring a wide range and a narrow-range light guide path for measuring a narrow range, and the wide-area light guide path and the narrow-range light guide. Switching means for switching a light guide path for guiding light among the paths can be provided.

  According to the present invention, the entire measurement range can be measured three-dimensionally with high accuracy using a single three-dimensional measurement device by simply switching between a wide measurement range and a narrow measurement range with a simple structure.

Further, as an aspect of the present invention, a part of the housing may include at least the light guide path, and may be configured with a detachment / exchange part that can change the measurement range in the measurement range by detachment / replacement.
According to the present invention, it is possible to switch between a wide measurement range and a narrow measurement range by simply attaching and detaching, and to perform three-dimensional measurement of the entire measurement range with high accuracy using a single three-dimensional measurement device.
It is preferable to further include a desorption error detection unit that detects a desorption error of the desorption exchange unit, and a measurement result correction unit that corrects the measurement result based on the desorption error.

In addition, as an aspect of the present invention, it is configured to be detachable from the housing, and includes an attachment that includes at least the light guide path and is attached to and detached from the housing to change a measurement range in the measurement range. be able to.
According to the present invention, it is possible to switch between a wide measurement range and a narrow measurement range by simply detaching the attachment, and to perform three-dimensional measurement of the entire measurement range with high accuracy using a single three-dimensional measurement device.
In addition, it is preferable to further include a desorption error detection unit that detects an attachment desorption error and a correction unit that corrects the measurement result based on the desorption error.

  According to the present invention, the present invention provides an intra-oral three-dimensional measurement apparatus, intra-oral three-dimensional measurement method, and intra-oral three-dimensional measurement result display method capable of accurately three-dimensionally measuring a wide measurement range in the oral cavity which is a narrow space. Can be provided.

The schematic block diagram of the intraoral three-dimensional measuring apparatus. 1 is a schematic configuration diagram of a handy scanner. The flowchart of the intraoral three-dimensional measuring method. Explanatory drawing about the intraoral three-dimensional measuring method. The schematic block diagram of the handy scanner of another embodiment. The schematic block diagram of the handy scanner of another embodiment. The schematic block diagram of the handy scanner of another embodiment. The flowchart of the intraoral three-dimensional measuring method of another embodiment. The flowchart of the intraoral three-dimensional measuring method of another embodiment. Schematic of the display method of the intraoral three-dimensional measurement result. Explanatory drawing about the conventional intraoral three-dimensional measuring method.

Hereinafter, an intraoral three-dimensional measuring apparatus 1 according to the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows a schematic diagram of an intraoral three-dimensional measuring apparatus 1, FIG. 2 shows a schematic configuration diagram of a handy scanner 10 (corresponding to a three-dimensional measuring device), and FIG. 3 shows a flow chart of the intraoral three-dimensional measuring method. FIG. 4 shows an explanatory diagram of the intraoral three-dimensional measurement method.

  Specifically, FIG. 4A shows a perspective view of a wide range 3D measurement situation, FIG. 4B shows a perspective view of a narrow range 3D measurement situation, and FIG. 4C shows a wide range 3D image Iw ( 4 (d) shows a state in which a narrow range 3D image In (corresponding to the narrow range 3D image information) is superimposed on the wide range 3D image Iw and processed. FIG. 4E shows a synthesized 3D image Ic (corresponding to synthesized 3D image information).

  As shown in FIG. 1, the intraoral three-dimensional measuring apparatus 1 is an apparatus that measures the three-dimensional shape of the dental arch Da in the oral cavity. The intraoral three-dimensional measuring apparatus 1 includes a handy scanner 10, a control unit 20, and a monitor 30. The handy scanner 10 and the monitor 30 are connected to the control unit 20.

The handy scanner 10 includes a grippable case 110 and a tip unit 120 (120a, 120b) corresponding to a detachable / exchangeable part that can be attached to and detached from the case 110.
The housing 110 includes a light source 111, a pattern generation unit 112 that converts the projection light Lt emitted from the light source 111 toward the tooth T that is an object to be measured, into structured light having a desired pattern, and projection light. And an image pickup unit 113 corresponding to an image pickup device for photographing the irradiated field irradiated with. The light source 111, the pattern generation unit 112, and the imaging unit 113 are connected to the control unit 20 described later, and are controlled by the control / calculation device 21 of the control unit 20.

  Here, as the pattern generation unit 112, for example, a slit-shaped mask in which a light transmission unit and a light-blocking unit are periodically repeated is used, so that the light emitted from the light source 111 is used as projection light having a sinusoidal pattern. It is configured to irradiate. Note that, by combining the light source 111 and the pattern generation unit 112, it can be regarded as a structured light source.

  The light source 111 includes various light sources such as a planar light source having a planar light emitting portion, a spot light source having a spot shape, a strip light source having a strip shape, and a single light source or an array in which a plurality of light sources are arranged. Shaped light source. The light source includes light shaped using a lens, an optical fiber, a diffusion plate, a mask, or the like.

  The imaging unit 113 includes a plurality of imaging units 113 when the three-dimensional measurement method is based on a stereo method using a multi-view camera, or a single unit when the three-dimensional measurement method is based on a method other than the stereo method. The imaging unit 113 is used. Here, as an example, since a three-dimensional measurement method based on the phase shift method is used, it is illustrated as an apparatus having a single imaging unit 113.

  The imaging unit 113 can be configured by a CCD image sensor (Charge Coupled Device image sensor) using a photodiode or a CMOS image sensor (Complementary MOS image sensor). In addition, here, the entrance / exit port 121 is drawn to be the lower surface on the front end side, but it may be provided in an arbitrary direction.

  The tip unit 120 is configured to be detachable from the tip side of the housing 110, and guides the projection light Lt irradiated from the light source 111 to the tooth T or the like as the object to be measured and guides the reflected light Lr. The optical path 130 is built in, and the projection light Lt is emitted toward the tooth T, and an incident / exit port 121 through which the reflected light Lr reflected by the tooth T is incident is provided on the lower surface on the distal end side.

The light guide path 130 includes a projection light path 131 that guides the projection light Lt and a reflected light path 132 that guides the reflected light Lr.
The tip unit 120 includes a wide range tip unit 120a having a wide measurable area and a narrow range tip unit 120b having a narrow measurable area that is narrower than the wide range. It is configured as possible.

  The built-in light guide path 130 is different between the wide range tip unit 120a for wide range measurement and the narrow range tip unit 120b for narrow range measurement, and the wide range tip unit 120a has a light guide for wide range where the measurable area is wide. The path 130a is built in, and the narrow-range tip unit 120b has a built-in narrow-range light guide path 130b whose measurable area is a narrow range.

  Of course, the wide-range light guide path 130a includes a wide-range projection light path 131a and a wide-area reflected light path 132a, and the narrow-range light guide path 130b includes the narrow-range light guide path 131b and the narrow-range reflected light. It is comprised with the path | route 132b. The change of the measurable range can be realized by appropriately designing the arrangement, the focal length, the number of the optical elements such as lenses built in the light guide path in each tip unit.

The control unit 20 to which the handy scanner 10 and the monitor 30 are connected includes a control / arithmetic unit 21 and a storage unit 22.
The control / arithmetic unit 21 dynamically changes the pattern of the structured light to be projected or emitted from the light source 111 (for example, the phase shift of the structured light in the phase shift method or the structured light in the focusing method). (Focus position change) or the imaging of the imaging unit 113 is controlled, and a three-dimensional shape is calculated based on the result of imaging by the imaging unit 113 to generate a three-dimensional measurement image. The storage unit 22 is connected to the control / arithmetic unit 21 and the control / arithmetic unit 21, and stores various data, a control program for controlling the connected device, and the like.

The monitor 30 is a display device configured by liquid crystal or the like, and is configured to be connected to the control unit 20 and to display a three-dimensional measurement image I and the like by control from the control unit 20.
In FIG. 1, the control unit 20 and the handy scanner 10 are depicted as having separate housings. However, when the whole or part of the control unit 20 is sufficiently small, the handy scanner 10 It may be incorporated inside the housing 110.

With reference to FIGS. 3 and 4, the intraoral three-dimensional measurement method for accurately three-dimensionally measuring a wide measurement range in a narrow oral cavity using the intraoral three-dimensional measurement apparatus 1 configured as described above will be described below. I will explain it.
In the following description, a case where three-dimensional measurement is performed on the entire dental arch Da as a wide range of measurement in a narrow oral cavity will be described.

  First, as shown in FIG. 4A, the wide range Rw in which the entire dental arch Da is accommodated by the handy scanner 10 in which the wide range tip unit 120a incorporating the wide range light guide path 130a is mounted on the housing 110 is tertiary. Wide range 3D measurement information is acquired by performing original measurement (see step s1, FIG. 3), and based on the acquired wide range 3D measurement information, a wide range 3D image Iw is created by the control / arithmetic unit 21 and displayed on the monitor 30 (See FIG. 4C).

  The wide-range three-dimensional measurement information measured at this time is information on the entire wide-area Rw acquired by the handy scanner 10 equipped with the wide-area tip unit 120a including the wide-area light guide path 130a. The wide-range three-dimensional image Iw based on the information also has a low resolution. In addition, the wide-range three-dimensional image Iw often lacks the third-order information of the blind spot, and is an incomplete three-dimensional image. 4C, 4D, and 4E, low-resolution images are illustrated by dotted lines, and high-resolution images are illustrated by solid lines as described later.

  Next, as shown in FIG. 4 (b), the handy scanner 10 in which the narrow-range tip unit 120b including the narrow-range light guide path 130b is replaced with the wide-range tip unit 120a and mounted on the housing 110 is installed. In the dental arch Da, a narrow range Rn in which a small number or a plurality of teeth T are accommodated is three-dimensionally measured to obtain narrow range three-dimensional measurement information (step s2). Based on the acquired narrow range three-dimensional measurement information, A narrow-range three-dimensional image In is created by the control / arithmetic unit 21.

  The narrow range three-dimensional measurement information measured at this time is information on the narrow range Rn acquired by the handy scanner 10 equipped with the narrow range tip unit 120b including the narrow range light guide path 130b. It becomes high resolution information about a narrow range, and the narrow range three-dimensional image In based on the information also has high resolution.

  Then, the narrow-range three-dimensional image In created by the control / arithmetic unit 21 is displayed on the monitor 30 together with the wide-range three-dimensional image Iw, and as shown in FIG. 4D, the low-resolution wide-range three-dimensional image Iw is displayed. Then, a superimposing process for creating a synthesized three-dimensional image Ic by superimposing the high-resolution narrow-range three-dimensional image In is performed (step s3).

  More specifically, in the superimposition process, the characteristic location included in each of the narrow range three-dimensional measurement information displayed as the narrow range three-dimensional image In and the wide range three-dimensional measurement information displayed as the wide range three-dimensional image Iw. Information (hereinafter referred to as feature location information) is compared, common feature location information (corresponding to position information within the measurement range) is extracted, and low resolution wide-range 3D measurement information (wide range) via the common feature location information A process of superimposing high-resolution narrow-range three-dimensional measurement information (narrow-range three-dimensional image In) on the three-dimensional image Iw) is performed.

In this way, the superposition process (step s3) for superimposing the high resolution narrow range 3D image In on the low resolution wide range 3D image Iw to create the synthesized 3D image Ic is performed by the dental arch Da. It is repeated a plurality of times throughout (step s4: No).
FIG. 4D shows a state in which a superimposition process for superposing a plurality of narrow-range three-dimensional images In on the right back is performed on the wide-range three-dimensional image Iw of the entire dental arch Da.

  The overlapping process of the narrow range three-dimensional image In on the wide range three-dimensional image Iw is performed a predetermined number of times, that is, when a plurality of narrow range three-dimensional images In are superimposed over the entire wide range three-dimensional image Iw (step s4: Yes). ) Overwrite the information on the corresponding part of the wide-range three-dimensional image Iw with the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw to complete the composite three-dimensional image Ic (step s5).

  The handy scanner 10 is provided with a position information acquisition unit 40 such as GPS that obtains position information of the three-dimensional measurement information to be measured (wide-range three-dimensional measurement information, narrow-range three-dimensional measurement information), and based on the acquired position information. (Position information acquisition step), the total third order for adjusting the position when the narrow range three-dimensional measurement information (narrow range three-dimensional image In) is superimposed on the wide range three-dimensional measurement information (wide range three-dimensional image Iw). Original information (composite 3D image Ic) may be created.

  Further, in the above description, the wide range tip unit 120a and the narrow range tip unit 120b are configured to be attached to and detached from the case 110, but the tip unit 120 and the case 110 when they are exchanged are used. A desorption error detecting unit 50 (see FIG. 1) for detecting the desorption error d (see FIG. 2) and a measurement result correcting unit for correcting the three-dimensional measurement result according to the desorption error d detected by the desorption error detecting unit 50 23 (see FIG. 1) may be provided.

  Further, in the above description, the wide-range tip unit 120a and the narrow-range tip unit 120b are attached to and detached from the housing 110, but as shown in FIG. Instead of the unit 120b, the attachment 120c including the additional light guide path 130c is attached to the wide-area tip unit 120a, and the wide-area tip unit 120a and the attachment 120c are combined to support the narrow-range tip unit 120b. You may let them.

  Note that the attachment 120c is depicted as having the entrance / exit port 121 on the lower surface on the front end side, as with the front end unit 120, but may be provided in any direction. The additional light guide path 130c includes an additional projection light path 131c and an additional reflected light path 132c, similarly to the wide-area light guide path 130a.

  Further, in FIG. 5, it is drawn to function as a narrow-range tip unit by combining an attachment with the originally-provided tip unit for wide range, but conversely, the tip unit for narrow range originally provided Of course, it can be configured to function as a tip unit for a wide range by combining attachments. The change of the measurement range can be realized by appropriately designing the arrangement, the focal length, the number of the optical elements such as lenses incorporated in the light guide path in the tip unit and the attachment.

  The attachment 120c also has a detachment error detection unit 50 that detects a detachment error d ′ (see FIG. 5) of the attachment 120c with respect to the wide-area tip unit 120a, and a three-dimensional response according to the detachment error d detected by the detachment error detection unit. You may provide the measurement result correction | amendment part 23 which correct | amends a measurement result.

  Furthermore, as shown in FIG. 6, a front end unit 120d including a light guide path 130a for a wide range and a light guide path 130b for a narrow range as well as an optical path switching unit 60 such as a mirror for switching the optical path is mounted on the housing 110. The control unit 20 may be provided with a switching control unit 24 (see FIG. 1) that controls the optical path switching unit 60.

  In FIG. 6, the wide-range light guide path 130a and the narrow-range light guide path 130b are arranged in parallel in the tip unit 120d and the optical path is switched by the optical path switching unit 60. The optical path 130a and the additional light guide path 130c built in the attachment 120c may be arranged in series, and the optical path switching unit 60 may switch whether to guide the additional light guide path 130c. The change of the measurement range can be realized by designing so that the arrangement, the focal length, the number, etc. of optical elements such as lenses incorporated in each light guide path can be appropriately selected by switching.

  Further, as shown in FIG. 7, an optical element capable of adjusting the focal length such as a variable focus lens including a liquid lens, a spatial light modulator, and a deformable mirror is incorporated, or a lens constituting the light guide is mechanically installed. You may use the front-end | tip unit 120e which incorporated the range adjustment light guide path 130e (131e, 132e) which can adjust a measurable area | region from a wide range to a narrow range by moving.

  In the above description, after all the narrow-range three-dimensional images In are overlaid (step s4: Yes), the information on the corresponding part of the wide-range three-dimensional image Iw is overwritten with the information of the narrow-range three-dimensional image In ( In step s5), after overlapping each narrow-range three-dimensional image In (step s3), processing is performed so that the information on the corresponding part of the wide-range three-dimensional image Iw is overwritten with the information in the narrow-range three-dimensional image In. May be.

  Furthermore, in the above description, as the wide-range three-dimensional measurement information constituting the wide-range three-dimensional image Iw, the entire dental arch Da is measured as a wide range Rw, but the dental arch Da is divided into a plurality of wide ranges Rw. Three-dimensional measurement may be performed.

  In this case, as shown in FIG. 8, a wide range Rw set as a part of the dental arch Da is set by the handy scanner 10 in which the wide range tip unit 120a including the wide range light guide path 130a is mounted on the casing 110. Three-dimensional measurement is performed to acquire a wide range of three-dimensional measurement information (step t1).

  This is repeated a plurality of times (step t2: No), and wide-range three-dimensional measurement information of the entire dental arch Da is acquired (step t2: Yes). At this time, the range is set so that the plurality of wide ranges Rw cover the entire dental arch Da, and the wide ranges Rw overlap each other.

  The wide range Rw is a part of the dental arch Da, but is wider than the narrow range Rn. Therefore, the number of times of wide-range three-dimensional measurement for measuring the wide range Rw a plurality of times and measuring the entire dental arch Da is a narrow range tertiary for measuring the narrow range Rn a plurality of times and measuring the entire dental arch Da. Less than the number of original measurements.

  Then, a process of joining the acquired plurality of wide-range three-dimensional measurement information using the three-dimensional measurement information of the overlapping portion Rr as a joining reference is performed (step t3), and the total joint measurement information of the entire dental arch Da is obtained. create.

  Created by the control / arithmetic unit 21 based on the narrow-range three-dimensional measurement information obtained by three-dimensionally measuring the narrow range Rn with respect to the wide-range three-dimensional image Iw created by the control / calculation unit 21 based on the total joint measurement information. The superposed narrow range three-dimensional image In (step t4) is superimposed to create a composite three-dimensional image Ic (step t5), and is repeated a plurality of times until the entire dental arch Da is obtained (step t6: No). .

  The overlapping process of the narrow range three-dimensional image In on the wide range three-dimensional image Iw is performed a predetermined number of times, that is, when a plurality of narrow range three-dimensional images In are overlaid over the wide range three-dimensional image Iw (step t6: Yes). ) Overwrite the information of the corresponding part of the wide-range three-dimensional image Iw with the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw to complete the composite three-dimensional image Ic (step t7).

  Furthermore, when a plurality of wide-range three-dimensional measurement information is connected to create total joint measurement information, and a wide-range three-dimensional image Iw is created based on the total joint measurement information, a plurality of wide-range three-dimensional measurement information is connected. The combined total joint measurement information may be adjusted based on narrow-range three-dimensional measurement information including information on a part corresponding to the overlap part Rr serving as a joint reference.

  In this case, as shown in FIG. 9, first, the steps u1 to u3 corresponding to the above-described steps t1 to t3 are performed to create the total joint measurement information of the entire dental arch Da.

  Next, a narrow range Rn in which a small number or a plurality of teeth T of the dental arch Da are accommodated by the handy scanner 10 in which the narrow range distal end unit 120b including the narrow range light guide path 130b is mounted on the housing 110 is formed. When three-dimensional measurement is performed to obtain narrow-range three-dimensional measurement information (step u4), but the acquired narrow-range three-dimensional measurement information includes measurement information of a location corresponding to the overlapping location Rr that is a connection reference (Step u5: Yes), the corresponding wide range based on the narrow range three-dimensional measurement information (corresponding to the adjustment narrow range three-dimensional measurement information) including the measurement information of the portion corresponding to the overlapping portion Rr serving as the joining reference. It is determined whether or not the connection of the three-dimensional measurement information is to be adjusted. When the adjustment is to be made (step u6: Yes), the adjusted total connection measurement information (step u7) is added. And then combined processes superimposed narrow range three-dimensional measurement information, to create a composite three-dimensional information (step u8).

  Corresponding to the overlap location Rr serving as the joining reference when the acquired narrow-range three-dimensional measurement information does not include the measurement information of the location corresponding to the overlap location Rr serving as the joining reference (Step u5: No). If the connection of the corresponding wide-range three-dimensional measurement information is not adjusted based on the narrow-range three-dimensional measurement information including the measurement information of the place to be performed (step u6: No), the whole combined measurement information is narrow as it is. The range three-dimensional measurement information is overlaid (step u8). Then, this process is repeated a plurality of times (step u9: No), and the narrow range three-dimensional measurement information is overlaid on the entire joint measurement information (step u9: Yes), and then superimposed on the whole joint measurement information. The narrow range three-dimensional measurement information is overwritten to complete the combined three-dimensional image Ic (step u10).

In the above description, even if the predetermined condition for ending the repetition is not reached in the middle of the repetition of steps s4, t2, t6, u2, and u9, the user presses the interruption switch or the like. There may be an operation mode in which the measurement is interrupted to complete the three-dimensional images Ic and Iw, but the repetition is incomplete.
Further, there may be an operation mode in which measurement is restarted from the middle of steps s4, t2, t6, u2, and u9 repeatedly by the user pressing a restart switch after the interruption.

In the above description, the high resolution narrow range 3D image In is displayed on the low resolution wide range 3D image Iw. However, as shown in FIG. 10, for example, the low resolution wide range 3D image In is displayed. The image Iw is displayed with low brightness, the high resolution narrow-range 3D image In is displayed with high brightness, and the color, brightness, or display pattern of the wide-range 3D image Iw and narrow-range 3D image In (for example, continuous lighting) , Blinking, etc.) may be changed for display. Of course, brightness, color, luminance, display pattern, and other different display methods may be combined for display.
In the above description, the measurement target is the entire dental arch Da, but the measurement target may be a part of the dental arch Da.

  In this way, using the intraoral three-dimensional measuring apparatus 1, wide-area three-dimensional measurement information acquisition for acquiring wide-area three-dimensional measurement information obtained by measuring the shape of the wide-range Rw including the dental arch Da that is a desired measurement range in the oral cavity is obtained. Step (steps s1, t1, u1) and a narrow range three-dimensional measurement information acquisition step (steps s2, t4, t4) for acquiring a plurality of narrow range three-dimensional measurement information obtained by measuring a three-dimensional shape of a narrow range Rn narrower than the wide range Rw u4) and the position information (characteristic location information) in the measurement range common to the wide range 3D measurement information and the narrow range 3D measurement information, and the narrow range 3D measurement information is arranged based on the wide range 3D measurement information. Then, a narrow range based on a wide range of three-dimensional measurement information is obtained by performing a synthetic three-dimensional information creation step (steps s3, t5, u8) for creating synthetic three-dimensional information of the measurement range. It is possible to obtain synthetic three-dimensional information of the measurement range composed of the three-dimensional measurement information, and the accumulation of errors that has been a problem in the conventional measurement device Z does not occur, and a wide range of dentitions in the oral cavity, which is a narrow space The bow Da can be accurately measured three-dimensionally.

  The wide range 3D measurement information is composed of a wide range 3D image Iw obtained by measuring the 3D shape of the wide range Rw, and the narrow range 3D measurement information is imaged from the measurement result of the narrow range Rn. The entire measurement range is formed by creating a composite 3D image Ic that is composed of the narrow range 3D image In and is imaged based on the composite 3D information in the composite 3D information creation step (steps s3, t5, u8). Therefore, the user can operate while visually confirming the measurement result, and the operability is improved.

  Further, in the narrow range three-dimensional measurement information acquisition step (steps s2, t4, u4), the narrow range three-dimensional measurement information is measured with a higher resolution than the wide range three-dimensional measurement information. Synthetic three-dimensional information (synthetic three-dimensional image Ic) of the measurement range composed of high-resolution narrow-range three-dimensional measurement information based on the measurement information can be created, and the entire measurement range can be three-dimensionally measured with high accuracy. .

  In addition, the narrow range three-dimensional measurement information (narrow range) in which the measurement information in the range in the wide range three-dimensional measurement information (wide range three-dimensional image Iw) in which the narrow range three-dimensional measurement information (narrow range three-dimensional image In) is arranged. By performing the overwriting process (steps s5, t7, u10) with the three-dimensional image In), the information amount of the combined three-dimensional information can be reduced.

  In addition, by measuring the shape of the entire dental arch Da with a wide range of three-dimensional measurement information, a plurality of pieces of information narrower than the wide range Rw and wider than the narrow range Rn described above are connected by overlapping portions in each information. Compared to the case where the entire measurement range formed as a whole is wide-range three-dimensional measurement information, more accurate combined three-dimensional information can be created.

  In addition, the wide range 3D image Iw (wide range 3D measurement information) and the narrow range 3D image In (narrow range 3D measurement information) measured by the intraoral 3D measurement method described above are superimposed and displayed on the monitor 30. Since the narrow range 3D image In can be synthesized while being superimposed on the wide range 3D image Iw, it can be operated while visually confirming the synthesis status of the narrow range 3D image In, and the synthesized 3D information can be created more reliably. can do.

  In addition, the handy scanner 10 includes a light source 111, a pattern generation unit 112 that converts the projection light Lt emitted from the light source 111 toward the tooth T, which is a measurement object, into structured light having a desired pattern, and a light source The projection light Lt emitted from 111 is guided to the dental arch Da, and the light guide path 130 (130a, 130b, 130c, 130e) for guiding the reflected light Lr from the dental arch Da and the projection light are emitted. Since the imaging unit 113 that captures the irradiated field, the light source 111, the pattern generation unit 112, and the imaging unit 113 are provided and the housing 110 that can be gripped is provided, the measurement range in the narrow oral cavity is increased. Three-dimensional measurement can be performed with high accuracy.

Further, in the case of the handy scanner 10 using the tip unit 120 (120a, 120b) capable of changing the measurement range in the measurement range by attaching / detaching the housing 110, the tip unit 120 is simply attached / detached and replaced. By switching between a wide measurement range and a narrow measurement range, the entire measurement range can be measured three-dimensionally with high accuracy using a single handy scanner.
In addition, it is preferable to further include a desorption error detection unit 50 that detects the desorption error d of the tip unit 120 (120a, 120b) and a measurement result correction unit 23 that corrects the measurement result based on the desorption error d.

In addition, as shown in FIG. 5, an additional light guide path 130c is built in, and an attachment 120c that is attached to and detached from the wide-area tip unit 120a attached to the housing 110 to change the measurement range in the measurement range is provided. By using the handy scanner 10, it is possible to switch between a wide measurement range and a narrow measurement range by simply attaching and detaching the attachment 120c, and three-dimensionally measuring the entire measurement range with high accuracy using a single handy scanner. Can do.
In addition, it is preferable to further include a detachment error detection unit 50 that detects a detachment error d ′ of the attachment 120c, and a measurement result correction unit 23 that corrects a measurement result based on the detachment error d ′.

  Further, as shown in FIG. 6, an optical path switching unit 60 that switches a light guide path to be guided among a wide-range light guide path 130 a that measures a wide range and a narrow-range light guide path 130 b that measures a narrow range is provided. In the case of the handy scanner 10 equipped with the tip unit 120d provided, the entire measurement range can be accurately tertiary using a single handy scanner by simply switching between a wide measurement range and a narrow measurement range with a simple structure. The original measurement can be performed.

  In addition, the handy scanner 10 includes a position information acquisition unit 40 and performs a position information acquisition step of acquiring the position information of each of the narrow-range three-dimensional measurement information and the wide-range three-dimensional measurement information, thereby creating a combined three-dimensional information creation step (step s3). , T5, u8), by adjusting the combined three-dimensional information based on the position information acquired in the position information acquiring step, more accurate and accurate combined three-dimensional information can be created.

  In addition, as shown in FIG. 8, a plurality of wide-range three-dimensional measurement information is arranged using the common wide-range position information in adjacent wide-range three-dimensional measurement information as a connection reference, and the total measurement information of the entire measurement range is obtained. By performing the entire combined measurement information creation step (steps t3, u3) to be created, accurate combined three-dimensional information can be created even in a wider measurement range.

  Further, as shown in FIG. 9, at least one of the plurality of narrow-range three-dimensional measurement information includes narrow-range three-dimensional measurement information (adjustment) including information on a location corresponding to the overlap location Rr serving as the connection reference. Narrow-range three-dimensional measurement information), and the overall combined measurement information is adjusted based on the narrow-range three-dimensional measurement information (adjusted narrow-range three-dimensional measurement information) in the combined three-dimensional information creation step (steps s3, t5, u8). By performing the overall connection measurement information adjustment step (step u7), the overall connection measurement information is adjusted based on clearer feature location information, so even more accurate combined three-dimensional even in a wider measurement range Information can be created.

  Further, as shown in FIG. 10, by displaying the wide-range three-dimensional image Iw and the narrow-range three-dimensional image In superimposed on the monitor 30, so that at least one of brightness, color, luminance, and display pattern is different, Since the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw can be clearly recognized, synthetic three-dimensional information can be created more accurately.

In correspondence between the configuration of the present invention and the above-described embodiment,
The wide-range three-dimensional measurement information acquisition process of the present invention corresponds to steps s1, t1, and u1,
Similarly,
The narrow-range three-dimensional measurement information acquisition step corresponds to steps s2, t4, u4,
The synthetic 3D information creation process corresponds to steps s3, t5, u8,
Wide range 3D image information corresponds to wide range 3D image Iw,
Narrow range 3D image information corresponds to the narrow range 3D image In,
The combined 3D image information corresponds to the combined 3D image Ic,
The overwriting process corresponds to steps s5, t7, u10,
The overall connection measurement information creation process corresponds to steps t3 and u3,
The adjusted narrow range three-dimensional measurement information corresponds to the narrow range three-dimensional measurement information including information on the location corresponding to the overlap location Rr,
The overall connection measurement information adjustment process corresponds to step u7,
The measurement information acquisition unit and the three-dimensional measurement device correspond to the handy scanner 10,
The combined 3D information creation unit corresponds to the control / arithmetic unit 21,
The position information acquisition unit corresponds to the position information acquisition unit 40,
The object to be measured corresponds to the dental arch Da,
The light guide path corresponds to the light guide path 130, the light guide path 130a for a wide range, the light guide path 130b for a narrow range, the additional light guide path 130c, and the range adjustment light guide path 130e,
The imaging element corresponds to the imaging unit 113,
The wide light guide path corresponds to the wide light guide path 130a,
The narrow-range light guide path corresponds to the narrow-range light guide path 130b,
The switching means corresponds to the optical path switching unit 60,
The attachment / detachment exchange unit corresponds to the tip unit 120 (120a, 120b),
The present invention is not limited to the configuration of the embodiment described above, and many embodiments can be obtained.
For example, in the above description, the entire dental arch Da is used as the desired measurement range, but may be a part of the dental arch Da, or the entire edentulous jaw or a part thereof.

The above-mentioned position information may be constituted by not only the position information acquisition unit 40 such as GPS but also a position sensor that measures a relative position with respect to the oral cavity. Alternatively, the position information may be acquired using an acceleration sensor, a speed sensor, a gyro sensor, an orientation sensor, a posture sensor, or a combination of the above various sensors.
Furthermore, the handy scanner 10 may include a light source for illumination in addition to the light source 111.

  In the above description, the narrow range 3D in which the measurement information in the range is arranged in the wide range 3D measurement information (wide range 3D image Iw) in which the narrow range 3D measurement information (narrow range 3D image In) is arranged. Although the overwriting process (steps s5, t7, u10) is performed with the measurement information (narrow range three-dimensional image In), it is not necessary to perform the overwriting process by performing only the overlaying process.

DESCRIPTION OF SYMBOLS 1 ... Intraoral three-dimensional measuring device 10 ... Handy scanner 21 ... Control and calculation device 40 ... Position information acquisition part 60 ... Optical path switching part 110 ... Case 111 ... Light source 112 ... Pattern generation part 113 ... Imaging part 120, 120d, 120e ... tip unit 120a ... tip unit 120b for wide area ... tip unit 120c for narrow area ... attachment 130 ... light guide path 130a ... light guide path 130b for wide area ... light guide path 130c for narrow area ... additional light guide path 130e ... range adjustment guide Optical path Da ... Dental arch Ic ... Synthetic 3D image In ... Narrow range 3D image Iw ... Wide range 3D image Lr ... Reflected light Lt ... Projection light

  For example, an intraoral 3D measurement device and an intraoral 3D measurement method for imaging light irradiated toward a measurement target in the oral cavity such as a tooth, and performing image analysis processing to measure the three-dimensional shape of the measurement target The present invention also relates to a method for displaying intraoral three-dimensional measurement results.

  For example, there are measuring apparatuses and measuring methods for measuring a three-dimensional shape of a measuring object by various methods such as a light cutting method, a focusing method, a spatial code method, a phase shift method, a stereo method, a photogrammetry method, and a SLAM method. Proposed and implemented. For example, in the shape measuring device of Patent Document 1, projection light that has passed through a lattice pattern plate is projected onto a measurement object as light having a lattice shape, and reflected light of the projection light having the lattice shape projected onto the measurement object is reflected. It is an apparatus that can measure a three-dimensional shape of a measurement target based on a captured image. Further, in recent dental treatments, the three-dimensional shape of the dentition is measured by using the shape measuring device, and applied to artificial teeth and prosthesis design.

  However, for example, the measuring device Z as in Patent Document 1 cannot measure a wide measuring range in a narrow space such as the entire dental arch Da in the oral cavity at a time. This is because the dentition, which is the subject, has a complicated shape, and many blind spots are generated just by taking a single image, and the three-dimensional data is lost.

  For this reason, for example, it is necessary to divide the measurement into the following procedures. As shown in FIG. 11 (a), a narrow range Rn that is a part of the measurement target is measured (hereinafter referred to as narrow range measurement), and adjacent narrow ranges can be covered so that the entire measurement target can be covered. Each measurement is performed a plurality of times so as to include an overlapping portion Rr (hereinafter referred to as an overlapping portion) (see FIG. 11B). Then, as shown in FIG. 11C, adjacent narrow range measurement results In ′ are connected based on the overlap location Rr in each narrow range measurement result (referred to as narrow range measurement result In ′), and a wide range of measurements are performed. A measurement result (overall measurement result Ic ′) of the entire object is obtained.

  However, in this way, in the wide range of overall measurement results Ic ′ formed by sequentially connecting the adjacent narrow range measurement results In ′ based on the overlap location Rr, as shown in FIG. Even if the range measurement result In ′ is slightly connected, an error is generated, and the error is accumulated by sequentially connecting the entire measurement target, so that a large error may occur as the overall measurement result Ic ′.

JP 2011-242178 A

  Therefore, the present invention provides an intraoral 3D measuring device, an intraoral 3D measuring method, and an intraoral 3D measurement result display method capable of accurately measuring a wide range of measurement in the oral cavity which is a narrow space. The purpose is to do.

The invention includes a wide three-dimensional measurement information obtained by measuring the wide variety of three-dimensional shape in any one of the dental arch and edentulous in the oral cavity, in one of the dental arch and the edentulous Contact a three-dimensional measurement information obtaining step you get a plurality of narrow range three-dimensional measurement information of the respective three-dimensional shape of a plurality of narrow ranges measured kicking, and the extensive three-dimensional measurement information, a plurality of the narrow range three-dimensional based on the measurement information, wherein the a intraoral three-dimensional measurement method for performing a three-dimensional information creating step that creates information on three-dimensional shape of a wide range.

As an aspect of the present invention, the three-dimensional information creation step uses, as a synthesis reference, common position information common to the three-dimensional shape included in the wide-range three-dimensional measurement information and the three-dimensional shape included in the narrow-range three-dimensional measurement information. The narrow range three-dimensional measurement information may be arranged based on the wide range three-dimensional measurement information.

As an aspect of the present invention, the wide-range three-dimensional shape included in the wide-range three-dimensional measurement information acquired in the three-dimensional measurement information acquisition step may have a blind spot.
Further, as an aspect of the present invention, the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information may be information obtained by being measured by a three-dimensional measurement device that inserts into the oral cavity and performs three-dimensional measurement. Good.
As an aspect of the present invention, the three-dimensional measuring device may measure the target three-dimensionally using a focusing method.

Further, the present invention provides a wide range three-dimensional measurement information obtained by measuring a wide range of three-dimensional shape in any one of the dental arch and edentulous jaw in the oral cavity, and a plurality of information in any one of the dental arch and the edentulous jaw. Based on the storage unit that stores a plurality of narrow range three-dimensional measurement information obtained by measuring each three-dimensional shape of the narrow range, the wide range three-dimensional measurement information, and the plurality of narrow range three-dimensional measurement information, It is an intraoral three-dimensional measuring apparatus provided with a three-dimensional information creating unit that creates information on the wide range of three-dimensional shapes.

  The present invention provides a wide-range three-dimensional measurement information acquisition step of acquiring wide-range three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a narrow-range three-dimensional shape narrower than the wide range in the measurement range. The narrow range 3D measurement information acquisition step for acquiring a plurality of measured narrow range 3D measurement information, and the wide range 3D measurement information and the position information in the measurement range common to the narrow range 3D measurement information as a synthesis reference It is an intraoral 3D measurement method that performs a combined 3D information creation step of arranging the narrow range 3D measurement information based on a wide range of 3D measurement information and creating composite 3D information of the measurement range. Features.

  In addition, the present invention acquires wide-range three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a plurality of narrow-range three-dimensional measurement information obtained by measuring a narrow three-dimensional shape that is narrower than the wide range. A measurement information acquisition unit that performs the narrow-range three-dimensional measurement information based on the wide-range three-dimensional measurement information based on a combination reference of the position information in the measurement range common to the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information. An intraoral three-dimensional measuring device provided with a synthetic three-dimensional information creating unit that arranges and creates synthetic three-dimensional information of the measurement range.

  The above-described wide range in the desired measurement range may be the entire desired measurement range, or may be a part of the desired measurement range, may be a range wider than the above-described narrow range, As a whole measurement range formed by joining a plurality of 3D measurement information that is a part of the measurement range, narrower than the above-mentioned wide range, and wider than the above-mentioned narrow range at overlapping portions in each 3D measurement information Also good.

Further, the measurement range can be the entire dental arch including the gingiva in the oral cavity, a predetermined region in the dental arch, or the entire edentulous jaw or a part thereof.
The above-mentioned wide-range three-dimensional measurement information, narrow-range three-dimensional measurement information, and synthetic three-dimensional information can be numerical information such as spatial coordinate information, texture direction vector information, measurement value reliability information, and image information.

According to the present invention, it is possible to accurately three-dimensionally measure a wide range of measurement objects in the oral cavity, which is a narrow space.
More specifically, according to the method described above, a wide range of three-dimensional measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity, and a plurality of measurements of a three-dimensional shape of a narrow range narrower than the wide range in the measurement range. Narrow-range three-dimensional measurement information is acquired, and the narrow-range three-dimensional measurement based on the wide-range three-dimensional measurement information using the common information in the measurement range in the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information as a synthesis reference Since the measurement information is arranged and the synthetic three-dimensional information of the measurement range is created, it can be the synthetic three-dimensional information of the measurement range composed of the narrow-range three-dimensional measurement information based on the wide-range three-dimensional measurement information. Accumulation of errors does not occur, and the entire measurement range can be accurately three-dimensionally measured.

  As an aspect of the present invention, the wide-range three-dimensional measurement information is composed of wide-range three-dimensional image information obtained by measuring the wide-range three-dimensional shape and imaging the narrow-range three-dimensional measurement information. It is composed of narrow-range three-dimensional image information obtained by imaging the measurement result, and in the synthetic three-dimensional information creation step, synthetic three-dimensional image information imaged based on the synthetic three-dimensional information can be created.

Alternatively, the combined three-dimensional information creation unit can be configured to create combined three-dimensional image information imaged based on the combined three-dimensional information.
According to the present invention, measurement information can be imaged and displayed, so that the user can operate while visually confirming the measurement state, and the operability is improved.

As an aspect of the present invention, in the narrow range three-dimensional measurement information acquisition step, the narrow range three-dimensional measurement information can be measured with higher resolution than the wide range three-dimensional measurement information.
According to the present invention, it is possible to obtain a combined three-dimensional information of a measurement range composed of high-resolution narrow-range three-dimensional measurement information based on a wide range of three-dimensional measurement information that does not accumulate errors, and the entire measurement range is highly accurate. In addition, high-resolution three-dimensional measurement is possible.

  Further, as an aspect of the present invention, in the composite 3D information creation step, the composite 3D information is obtained by using characteristic location information common to the narrow range 3D measurement information and the wide range 3D measurement information as position information within the measurement range. Can be created.

Alternatively, the composite 3D information creation unit creates the composite 3D information using characteristic location information common to the narrow range 3D measurement information and the wide range 3D measurement information as the position information in the measurement range. be able to.
According to the present invention, it is possible to create combined three-dimensional information obtained by accurately combining a plurality of narrow-range three-dimensional measurement information based on wide-range three-dimensional measurement information via feature location information.

  Further, as an aspect of the present invention, a position information acquisition step of acquiring position information of each of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information is performed, and in the composite three-dimensional information creation step, the position information acquisition step The synthesized three-dimensional information can be adjusted based on the position information acquired in (1).

  Alternatively, it includes a position information acquisition unit that acquires position information of each of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information, and the combined three-dimensional information creation unit is acquired by the position information acquisition unit. Based on the information, the combined three-dimensional information can be adjusted.

  The position information described above can be position information based on the entire position at the time of three-dimensional measurement, such as GPS, or position information based on a relative position with respect to the oral cavity, for example. Therefore, the position information acquisition unit can be a measuring device that can measure the entire position such as GPS, or a measuring device that can measure a relative position such as a position sensor. Further, the position information may be acquired using an acceleration sensor, a speed sensor, a gyro sensor, an orientation sensor, an attitude sensor, or a combination of the above various sensors.

  According to this invention, in order to adjust the synthetic three-dimensional information based on the position information of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information, more accurate and accurate synthetic three-dimensional information is created. Can do.

Further, as an aspect of the present invention, in the synthetic three-dimensional information creation step, the narrow-range three-dimensional measurement information in which measurement information in a corresponding range in the wide-range three-dimensional measurement information in which the narrow-range three-dimensional measurement information is arranged Can be overwritten.
According to the present invention, the amount of information of the combined three-dimensional information can be reduced.

As an aspect of the present invention, the wide-range three-dimensional measurement information can be total measurement information obtained by measuring the entire shape in the measurement range.
According to the present invention, a wide range of three-dimensional measurement information of the entire measurement range formed by connecting a plurality of three-dimensional measurement information narrower than a wide range and wider than the above-mentioned narrow range by overlapping portions in each three-dimensional measurement information, Compared to the case, the accumulation of errors does not occur, and more accurate combined three-dimensional information can be created.

  Further, as an aspect of the present invention, a plurality of the wide range 3D measurement information is arranged using the common wide range position information in the adjacent wide range 3D measurement information as a connection reference, and the entire combined measurement information of the entire measurement range is obtained. It is possible to perform the entire combined measurement information creation step to be created.

  According to the present invention, a plurality of the wide-range three-dimensional measurement information is arranged using the common wide-range position information in the adjacent wide-range three-dimensional measurement information as a connection reference to create the total measurement information of the entire measurement range. Even in a wider measurement range, accurate synthetic measurement information can be created.

  Further, as an aspect of the present invention, at least one of the plurality of narrow range three-dimensional measurement information is adjusted narrow range three-dimensional measurement information including measurement information in a range corresponding to the wide range position information, and the composite three-dimensional information creation An overall joint measurement information adjustment step of adjusting the overall joint measurement information based on the adjusted narrow range three-dimensional measurement information arranged in the process can be performed.

  According to the present invention, the overall combined measurement information of the entire measurement range created by arranging a plurality of the wide-range three-dimensional measurement information using the common wide-range position information in the adjacent wide-range three-dimensional measurement information as a connection reference is adjusted narrowly. Since adjustment is made based on the range 3D measurement information, the overall combined measurement information is adjusted based on clearer feature location information, so even more accurate combined measurement information can be created even in a wider measurement range. .

  Further, as an aspect of the present invention, there is provided a display method of intraoral 3D measurement results in which the wide range 3D measurement information and the narrow range 3D measurement information measured by the intraoral 3D measurement method are imaged and superimposed. It is characterized by being.

  According to the present invention, since the imaged narrow range 3D measurement information can be synthesized while being superimposed on the imaged wide range 3D measurement information, the user can visually confirm the synthesis status of the narrow range 3D measurement information. It is possible to create composite 3D information more reliably.

As an aspect of the present invention, the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information that are imaged and superimposed are displayed so that at least one of brightness, color, luminance, and display pattern is different. it can.
According to the present invention, the user can clearly recognize the narrow-range three-dimensional measurement information superimposed and displayed on the wide-range three-dimensional measurement information, and therefore can create synthesized three-dimensional information more accurately.

  As an aspect of the present invention, the measurement information acquisition unit includes a light source that irradiates the object to be measured with projection light, an image sensor that captures the irradiation field irradiated with the projection light, and reflected light from the object to be measured. Can be configured by a three-dimensional measuring instrument including a light guide path that guides light to the image sensor, a light source, the light guide path, and a housing that includes the image sensor and can be gripped.

  The light source includes various light sources such as a planar light source having a planar light emitting portion, a spot light source having a spot shape, a strip light source having a strip shape, and a single light source or an array in which a plurality of light sources are arranged. Shaped light source. The light source includes light that passes through a lens and an optical fiber, and light that is shaped using a diffusion plate, a mask, or the like. The light source may be a uniform light source that emits uniform projection light, or a structured light source that emits structured projection light such as a sine wave or checkered lattice, Both the uniform light source and the structured light source may be provided. The structured light source may include a mechanism for dynamically changing the structured pattern of projection light. The projection light may pass through the light guide path, or a light source may be arranged so as to directly irradiate the measurement object without passing through the light guide path.

For example, when the three-dimensional measurement method is based on a stereo method using a multi-lens camera, the image sensor may be composed of a plurality of image sensors, or may be based on a three-dimensional measurement method other than the stereo method. For example, a single image sensor may be used. The imaging element includes a CCD image sensor (Charge Coupled Device image sensor) using a photodiode, a CMOS image sensor (Complementary MOS image sensor), and the like.
According to the present invention, a narrow intraoral measurement range can be three-dimensionally measured with high accuracy.

  As an aspect of the present invention, the light guide path includes a wide-range light guide path for measuring a wide range and a narrow-range light guide path for measuring a narrow range, and the wide-area light guide path and the narrow-range light guide. Switching means for switching a light guide path for guiding light among the paths can be provided.

  According to the present invention, the entire measurement range can be measured three-dimensionally with high accuracy using a single three-dimensional measurement device by simply switching between a wide measurement range and a narrow measurement range with a simple structure.

Further, as an aspect of the present invention, a part of the housing may include at least the light guide path, and may be configured with a detachment / exchange part that can change the measurement range in the measurement range by detachment / replacement.
According to the present invention, it is possible to switch between a wide measurement range and a narrow measurement range by simply attaching and detaching, and to perform three-dimensional measurement of the entire measurement range with high accuracy using a single three-dimensional measurement device.
It is preferable to further include a desorption error detection unit that detects a desorption error of the desorption exchange unit, and a measurement result correction unit that corrects the measurement result based on the desorption error.

In addition, as an aspect of the present invention, it is configured to be detachable from the housing, and includes an attachment that includes at least the light guide path and is attached to and detached from the housing to change a measurement range in the measurement range. be able to.
According to the present invention, it is possible to switch between a wide measurement range and a narrow measurement range by simply detaching the attachment, and to perform three-dimensional measurement of the entire measurement range with high accuracy using a single three-dimensional measurement device.
In addition, it is preferable to further include a desorption error detection unit that detects an attachment desorption error and a correction unit that corrects the measurement result based on the desorption error.

  According to the present invention, the present invention provides an intra-oral three-dimensional measurement apparatus, intra-oral three-dimensional measurement method, and intra-oral three-dimensional measurement result display method capable of accurately three-dimensionally measuring a wide measurement range in the oral cavity which is a narrow space. Can be provided.

The schematic block diagram of the intraoral three-dimensional measuring apparatus. 1 is a schematic configuration diagram of a handy scanner. The flowchart of the intraoral three-dimensional measuring method. Explanatory drawing about the intraoral three-dimensional measuring method. The schematic block diagram of the handy scanner of another embodiment. The schematic block diagram of the handy scanner of another embodiment. The schematic block diagram of the handy scanner of another embodiment. The flowchart of the intraoral three-dimensional measuring method of another embodiment. The flowchart of the intraoral three-dimensional measuring method of another embodiment. Schematic of the display method of the intraoral three-dimensional measurement result. Explanatory drawing about the conventional intraoral three-dimensional measuring method.

Hereinafter, an intraoral three-dimensional measuring apparatus 1 according to the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows a schematic diagram of an intraoral three-dimensional measuring apparatus 1, FIG. 2 shows a schematic configuration diagram of a handy scanner 10 (corresponding to a three-dimensional measuring device), and FIG. 3 shows a flow chart of the intraoral three-dimensional measuring method. FIG. 4 shows an explanatory diagram of the intraoral three-dimensional measurement method.

  Specifically, FIG. 4A shows a perspective view of a wide range 3D measurement situation, FIG. 4B shows a perspective view of a narrow range 3D measurement situation, and FIG. 4C shows a wide range 3D image Iw ( 4 (d) shows a state in which a narrow range 3D image In (corresponding to the narrow range 3D image information) is superimposed on the wide range 3D image Iw and processed. FIG. 4E shows a synthesized 3D image Ic (corresponding to synthesized 3D image information).

  As shown in FIG. 1, the intraoral three-dimensional measuring apparatus 1 is an apparatus that measures the three-dimensional shape of the dental arch Da in the oral cavity. The intraoral three-dimensional measuring apparatus 1 includes a handy scanner 10, a control unit 20, and a monitor 30. The handy scanner 10 and the monitor 30 are connected to the control unit 20.

The handy scanner 10 includes a grippable case 110 and a tip unit 120 (120a, 120b) corresponding to a detachable / exchangeable part that can be attached to and detached from the case 110.
The housing 110 includes a light source 111, a pattern generation unit 112 that converts the projection light Lt emitted from the light source 111 toward the tooth T that is an object to be measured, into structured light having a desired pattern, and projection light. And an image pickup unit 113 corresponding to an image pickup device for photographing the irradiated field irradiated with. The light source 111, the pattern generation unit 112, and the imaging unit 113 are connected to the control unit 20 described later, and are controlled by the control / calculation device 21 of the control unit 20.

  Here, as the pattern generation unit 112, for example, a slit-shaped mask in which a light transmission unit and a light-blocking unit are periodically repeated is used, so that the light emitted from the light source 111 is used as projection light having a sinusoidal pattern. It is configured to irradiate. Note that, by combining the light source 111 and the pattern generation unit 112, it can be regarded as a structured light source.

  The light source 111 includes various light sources such as a planar light source having a planar light emitting portion, a spot light source having a spot shape, a strip light source having a strip shape, and a single light source or an array in which a plurality of light sources are arranged. Shaped light source. The light source includes light shaped using a lens, an optical fiber, a diffusion plate, a mask, or the like.

  The imaging unit 113 includes a plurality of imaging units 113 when the three-dimensional measurement method is based on a stereo method using a multi-view camera, or a single unit when the three-dimensional measurement method is based on a method other than the stereo method. The imaging unit 113 is used. Here, as an example, since a three-dimensional measurement method based on the phase shift method is used, it is illustrated as an apparatus having a single imaging unit 113.

  The imaging unit 113 can be configured by a CCD image sensor (Charge Coupled Device image sensor) using a photodiode or a CMOS image sensor (Complementary MOS image sensor). In addition, here, the entrance / exit port 121 is drawn to be the lower surface on the front end side, but it may be provided in an arbitrary direction.

  The tip unit 120 is configured to be detachable from the tip side of the housing 110, and guides the projection light Lt irradiated from the light source 111 to the tooth T or the like as the object to be measured and guides the reflected light Lr. The optical path 130 is built in, and the projection light Lt is emitted toward the tooth T, and an incident / exit port 121 through which the reflected light Lr reflected by the tooth T is incident is provided on the lower surface on the distal end side.

The light guide path 130 includes a projection light path 131 that guides the projection light Lt and a reflected light path 132 that guides the reflected light Lr.
The tip unit 120 includes a wide range tip unit 120a having a wide measurable area and a narrow range tip unit 120b having a narrow measurable area that is narrower than the wide range. It is configured as possible.

  The built-in light guide path 130 is different between the wide range tip unit 120a for wide range measurement and the narrow range tip unit 120b for narrow range measurement, and the wide range tip unit 120a has a light guide for wide range where the measurable area is wide. The path 130a is built in, and the narrow-range tip unit 120b has a built-in narrow-range light guide path 130b whose measurable area is a narrow range.

  Of course, the wide-range light guide path 130a includes a wide-range projection light path 131a and a wide-area reflected light path 132a, and the narrow-range light guide path 130b includes the narrow-range light guide path 131b and the narrow-range reflected light. It is comprised with the path | route 132b. The change of the measurable range can be realized by appropriately designing the arrangement, the focal length, the number of the optical elements such as lenses built in the light guide path in each tip unit.

The control unit 20 to which the handy scanner 10 and the monitor 30 are connected includes a control / arithmetic unit 21 and a storage unit 22.
The control / arithmetic unit 21 dynamically changes the pattern of the structured light to be projected or emitted from the light source 111 (for example, the phase shift of the structured light in the phase shift method or the structured light in the focusing method). (Focus position change) or the imaging of the imaging unit 113 is controlled, and a three-dimensional shape is calculated based on the result of imaging by the imaging unit 113 to generate a three-dimensional measurement image. The storage unit 22 is connected to the control / arithmetic unit 21 and the control / arithmetic unit 21, and stores various data, a control program for controlling the connected device, and the like.

The monitor 30 is a display device configured by liquid crystal or the like, and is configured to be connected to the control unit 20 and to display a three-dimensional measurement image I and the like by control from the control unit 20.
In FIG. 1, the control unit 20 and the handy scanner 10 are depicted as having separate housings. However, when the whole or part of the control unit 20 is sufficiently small, the handy scanner 10 It may be incorporated inside the housing 110.

With reference to FIGS. 3 and 4, the intraoral three-dimensional measurement method for accurately three-dimensionally measuring a wide measurement range in a narrow oral cavity using the intraoral three-dimensional measurement apparatus 1 configured as described above will be described below. I will explain it.
In the following description, a case where three-dimensional measurement is performed on the entire dental arch Da as a wide range of measurement in a narrow oral cavity will be described.

  First, as shown in FIG. 4A, the wide range Rw in which the entire dental arch Da is accommodated by the handy scanner 10 in which the wide range tip unit 120a incorporating the wide range light guide path 130a is mounted on the housing 110 is tertiary. Wide range 3D measurement information is acquired by performing original measurement (see step s1, FIG. 3), and based on the acquired wide range 3D measurement information, a wide range 3D image Iw is created by the control / arithmetic unit 21 and displayed on the monitor 30 (See FIG. 4C).

  The wide-range three-dimensional measurement information measured at this time is information on the entire wide-area Rw acquired by the handy scanner 10 equipped with the wide-area tip unit 120a including the wide-area light guide path 130a. The wide-range three-dimensional image Iw based on the information also has a low resolution. In addition, the wide-range three-dimensional image Iw often lacks the third-order information of the blind spot, and is an incomplete three-dimensional image. 4C, 4D, and 4E, low-resolution images are illustrated by dotted lines, and high-resolution images are illustrated by solid lines as described later.

  Next, as shown in FIG. 4 (b), the handy scanner 10 in which the narrow-range tip unit 120b including the narrow-range light guide path 130b is replaced with the wide-range tip unit 120a and mounted on the housing 110 is installed. In the dental arch Da, a narrow range Rn in which a small number or a plurality of teeth T are accommodated is three-dimensionally measured to obtain narrow range three-dimensional measurement information (step s2). Based on the acquired narrow range three-dimensional measurement information, A narrow-range three-dimensional image In is created by the control / arithmetic unit 21.

  The narrow range three-dimensional measurement information measured at this time is information on the narrow range Rn acquired by the handy scanner 10 equipped with the narrow range tip unit 120b including the narrow range light guide path 130b. It becomes high resolution information about a narrow range, and the narrow range three-dimensional image In based on the information also has high resolution.

  Then, the narrow-range three-dimensional image In created by the control / arithmetic unit 21 is displayed on the monitor 30 together with the wide-range three-dimensional image Iw, and as shown in FIG. 4D, the low-resolution wide-range three-dimensional image Iw is displayed. Then, a superimposing process for creating a synthesized three-dimensional image Ic by superimposing the high-resolution narrow-range three-dimensional image In is performed (step s3).

  More specifically, in the superimposition process, the characteristic location included in each of the narrow range three-dimensional measurement information displayed as the narrow range three-dimensional image In and the wide range three-dimensional measurement information displayed as the wide range three-dimensional image Iw. Information (hereinafter referred to as feature location information) is compared, common feature location information (corresponding to position information within the measurement range) is extracted, and low resolution wide-range 3D measurement information (wide range) via the common feature location information A process of superimposing high-resolution narrow-range three-dimensional measurement information (narrow-range three-dimensional image In) on the three-dimensional image Iw) is performed.

In this way, the superposition process (step s3) for superimposing the high resolution narrow range 3D image In on the low resolution wide range 3D image Iw to create the synthesized 3D image Ic is performed by the dental arch Da. It is repeated a plurality of times throughout (step s4: No).
FIG. 4D shows a state in which a superimposition process for superposing a plurality of narrow-range three-dimensional images In on the right back is performed on the wide-range three-dimensional image Iw of the entire dental arch Da.

  The overlapping process of the narrow range three-dimensional image In on the wide range three-dimensional image Iw is performed a predetermined number of times, that is, when a plurality of narrow range three-dimensional images In are superimposed over the entire wide range three-dimensional image Iw (step s4: Yes). ) Overwrite the information on the corresponding part of the wide-range three-dimensional image Iw with the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw to complete the composite three-dimensional image Ic (step s5).

  The handy scanner 10 is provided with a position information acquisition unit 40 such as GPS that obtains position information of the three-dimensional measurement information to be measured (wide-range three-dimensional measurement information, narrow-range three-dimensional measurement information), and based on the acquired position information. (Position information acquisition step), the total third order for adjusting the position when the narrow range three-dimensional measurement information (narrow range three-dimensional image In) is superimposed on the wide range three-dimensional measurement information (wide range three-dimensional image Iw). Original information (composite 3D image Ic) may be created.

  Further, in the above description, the wide range tip unit 120a and the narrow range tip unit 120b are configured to be attached to and detached from the case 110, but the tip unit 120 and the case 110 when they are exchanged are used. A desorption error detecting unit 50 (see FIG. 1) for detecting the desorption error d (see FIG. 2) and a measurement result correcting unit for correcting the three-dimensional measurement result according to the desorption error d detected by the desorption error detecting unit 50 23 (see FIG. 1) may be provided.

  Further, in the above description, the wide-range tip unit 120a and the narrow-range tip unit 120b are attached to and detached from the housing 110, but as shown in FIG. Instead of the unit 120b, the attachment 120c including the additional light guide path 130c is attached to the wide-area tip unit 120a, and the wide-area tip unit 120a and the attachment 120c are combined to support the narrow-range tip unit 120b. You may let them.

  Note that the attachment 120c is depicted as having the entrance / exit port 121 on the lower surface on the front end side, as with the front end unit 120, but may be provided in any direction. The additional light guide path 130c includes an additional projection light path 131c and an additional reflected light path 132c, similarly to the wide-area light guide path 130a.

  Further, in FIG. 5, it is drawn to function as a narrow-range tip unit by combining an attachment with the originally-provided tip unit for wide range, but conversely, the tip unit for narrow range originally provided Of course, it can be configured to function as a tip unit for a wide range by combining attachments. The change of the measurement range can be realized by appropriately designing the arrangement, the focal length, the number of the optical elements such as lenses incorporated in the light guide path in the tip unit and the attachment.

  The attachment 120c also has a detachment error detection unit 50 that detects a detachment error d ′ (see FIG. 5) of the attachment 120c with respect to the wide-area tip unit 120a, and a three-dimensional response according to the detachment error d detected by the detachment error detection unit. You may provide the measurement result correction | amendment part 23 which correct | amends a measurement result.

  Furthermore, as shown in FIG. 6, a front end unit 120d including a light guide path 130a for a wide range and a light guide path 130b for a narrow range as well as an optical path switching unit 60 such as a mirror for switching the optical path is mounted on the housing 110. The control unit 20 may be provided with a switching control unit 24 (see FIG. 1) that controls the optical path switching unit 60.

  In FIG. 6, the wide-range light guide path 130a and the narrow-range light guide path 130b are arranged in parallel in the tip unit 120d and the optical path is switched by the optical path switching unit 60. The optical path 130a and the additional light guide path 130c built in the attachment 120c may be arranged in series, and the optical path switching unit 60 may switch whether to guide the additional light guide path 130c. The change of the measurement range can be realized by designing so that the arrangement, the focal length, the number, etc. of optical elements such as lenses incorporated in each light guide path can be appropriately selected by switching.

  Further, as shown in FIG. 7, an optical element capable of adjusting the focal length such as a variable focus lens including a liquid lens, a spatial light modulator, and a deformable mirror is incorporated, or a lens constituting the light guide is mechanically installed. You may use the front-end | tip unit 120e which incorporated the range adjustment light guide path 130e (131e, 132e) which can adjust a measurable area | region from a wide range to a narrow range by moving.

  In the above description, after all the narrow-range three-dimensional images In are overlaid (step s4: Yes), the information on the corresponding part of the wide-range three-dimensional image Iw is overwritten with the information of the narrow-range three-dimensional image In ( In step s5), after overlapping each narrow-range three-dimensional image In (step s3), processing is performed so that the information on the corresponding part of the wide-range three-dimensional image Iw is overwritten with the information in the narrow-range three-dimensional image In. May be.

  Furthermore, in the above description, as the wide-range three-dimensional measurement information constituting the wide-range three-dimensional image Iw, the entire dental arch Da is measured as a wide range Rw, but the dental arch Da is divided into a plurality of wide ranges Rw. Three-dimensional measurement may be performed.

  In this case, as shown in FIG. 8, a wide range Rw set as a part of the dental arch Da is set by the handy scanner 10 in which the wide range tip unit 120a including the wide range light guide path 130a is mounted on the casing 110. Three-dimensional measurement is performed to acquire a wide range of three-dimensional measurement information (step t1).

  This is repeated a plurality of times (step t2: No), and wide-range three-dimensional measurement information of the entire dental arch Da is acquired (step t2: Yes). At this time, the range is set so that the plurality of wide ranges Rw cover the entire dental arch Da, and the wide ranges Rw overlap each other.

  The wide range Rw is a part of the dental arch Da, but is wider than the narrow range Rn. Therefore, the number of times of wide-range three-dimensional measurement for measuring the wide range Rw a plurality of times and measuring the entire dental arch Da is a narrow range tertiary for measuring the narrow range Rn a plurality of times and measuring the entire dental arch Da. Less than the number of original measurements.

  Then, a process of joining the acquired plurality of wide-range three-dimensional measurement information using the three-dimensional measurement information of the overlapping portion Rr as a joining reference is performed (step t3), and the total joint measurement information of the entire dental arch Da is obtained. create.

  Created by the control / arithmetic unit 21 based on the narrow-range three-dimensional measurement information obtained by three-dimensionally measuring the narrow range Rn with respect to the wide-range three-dimensional image Iw created by the control / calculation unit 21 based on the total joint measurement information. The superposed narrow range three-dimensional image In (step t4) is superimposed to create a composite three-dimensional image Ic (step t5), and is repeated a plurality of times until the entire dental arch Da is obtained (step t6: No). .

  The overlapping process of the narrow range three-dimensional image In on the wide range three-dimensional image Iw is performed a predetermined number of times, that is, when a plurality of narrow range three-dimensional images In are overlaid over the wide range three-dimensional image Iw (step t6: Yes). ) Overwrite the information of the corresponding part of the wide-range three-dimensional image Iw with the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw to complete the composite three-dimensional image Ic (step t7).

  Furthermore, when a plurality of wide-range three-dimensional measurement information is connected to create total joint measurement information, and a wide-range three-dimensional image Iw is created based on the total joint measurement information, a plurality of wide-range three-dimensional measurement information is connected. The combined total joint measurement information may be adjusted based on narrow-range three-dimensional measurement information including information on a part corresponding to the overlap part Rr serving as a joint reference.

  In this case, as shown in FIG. 9, first, the steps u1 to u3 corresponding to the above-described steps t1 to t3 are performed to create the total joint measurement information of the entire dental arch Da.

  Next, a narrow range Rn in which a small number or a plurality of teeth T of the dental arch Da are accommodated by the handy scanner 10 in which the narrow range distal end unit 120b including the narrow range light guide path 130b is mounted on the housing 110 is formed. When three-dimensional measurement is performed to obtain narrow-range three-dimensional measurement information (step u4), but the acquired narrow-range three-dimensional measurement information includes measurement information of a location corresponding to the overlapping location Rr that is a connection reference (Step u5: Yes), the corresponding wide range based on the narrow range three-dimensional measurement information (corresponding to the adjustment narrow range three-dimensional measurement information) including the measurement information of the portion corresponding to the overlapping portion Rr serving as the joining reference. It is determined whether or not the connection of the three-dimensional measurement information is to be adjusted. When the adjustment is to be made (step u6: Yes), the adjusted total connection measurement information (step u7) is added. And then combined processes superimposed narrow range three-dimensional measurement information, to create a composite three-dimensional information (step u8).

  Corresponding to the overlap location Rr serving as the joining reference when the acquired narrow-range three-dimensional measurement information does not include the measurement information of the location corresponding to the overlap location Rr serving as the joining reference (Step u5: No). If the connection of the corresponding wide-range three-dimensional measurement information is not adjusted based on the narrow-range three-dimensional measurement information including the measurement information of the place to be performed (step u6: No), the whole combined measurement information is narrow as it is. The range three-dimensional measurement information is overlaid (step u8). Then, this process is repeated a plurality of times (step u9: No), and the narrow range three-dimensional measurement information is overlaid on the entire joint measurement information (step u9: Yes), and then superimposed on the whole joint measurement information. The narrow range three-dimensional measurement information is overwritten to complete the combined three-dimensional image Ic (step u10).

In the above description, even if the predetermined condition for ending the repetition is not reached in the middle of the repetition of steps s4, t2, t6, u2, and u9, the user presses the interruption switch or the like. There may be an operation mode in which the measurement is interrupted to complete the three-dimensional images Ic and Iw, but the repetition is incomplete.
Further, there may be an operation mode in which measurement is restarted from the middle of steps s4, t2, t6, u2, and u9 repeatedly by the user pressing a restart switch after the interruption.

In the above description, the high resolution narrow range 3D image In is displayed on the low resolution wide range 3D image Iw. However, as shown in FIG. 10, for example, the low resolution wide range 3D image In is displayed. The image Iw is displayed with low brightness, the high resolution narrow-range 3D image In is displayed with high brightness, and the color, brightness, or display pattern of the wide-range 3D image Iw and narrow-range 3D image In (for example, continuous lighting) , Blinking, etc.) may be changed for display. Of course, brightness, color, luminance, display pattern, and other different display methods may be combined for display.
In the above description, the measurement target is the entire dental arch Da, but the measurement target may be a part of the dental arch Da.

  In this way, using the intraoral three-dimensional measuring apparatus 1, wide-area three-dimensional measurement information acquisition for acquiring wide-area three-dimensional measurement information obtained by measuring the shape of the wide-range Rw including the dental arch Da that is a desired measurement range in the oral cavity is obtained. Step (steps s1, t1, u1) and a narrow range three-dimensional measurement information acquisition step (steps s2, t4, t4) for acquiring a plurality of narrow range three-dimensional measurement information obtained by measuring a three-dimensional shape of a narrow range Rn narrower than the wide range Rw u4) and the position information (characteristic location information) in the measurement range common to the wide range 3D measurement information and the narrow range 3D measurement information, and the narrow range 3D measurement information is arranged based on the wide range 3D measurement information. Then, a narrow range based on a wide range of three-dimensional measurement information is obtained by performing a synthetic three-dimensional information creation step (steps s3, t5, u8) for creating synthetic three-dimensional information of the measurement range. It is possible to obtain synthetic three-dimensional information of the measurement range composed of the three-dimensional measurement information, and the accumulation of errors that has been a problem in the conventional measurement device Z does not occur, and a wide range of dentitions in the oral cavity, which is a narrow space The bow Da can be accurately measured three-dimensionally.

  The wide range 3D measurement information is composed of a wide range 3D image Iw obtained by measuring the 3D shape of the wide range Rw, and the narrow range 3D measurement information is imaged from the measurement result of the narrow range Rn. The entire measurement range is formed by creating a composite 3D image Ic that is composed of the narrow range 3D image In and is imaged based on the composite 3D information in the composite 3D information creation step (steps s3, t5, u8). Therefore, the user can operate while visually confirming the measurement result, and the operability is improved.

  Further, in the narrow range three-dimensional measurement information acquisition step (steps s2, t4, u4), the narrow range three-dimensional measurement information is measured with a higher resolution than the wide range three-dimensional measurement information. Synthetic three-dimensional information (synthetic three-dimensional image Ic) of the measurement range composed of high-resolution narrow-range three-dimensional measurement information based on the measurement information can be created, and the entire measurement range can be three-dimensionally measured with high accuracy. .

  In addition, the narrow range three-dimensional measurement information (narrow range) in which the measurement information in the range in the wide range three-dimensional measurement information (wide range three-dimensional image Iw) in which the narrow range three-dimensional measurement information (narrow range three-dimensional image In) is arranged. By performing the overwriting process (steps s5, t7, u10) with the three-dimensional image In), the information amount of the combined three-dimensional information can be reduced.

  In addition, by measuring the shape of the entire dental arch Da with a wide range of three-dimensional measurement information, a plurality of pieces of information narrower than the wide range Rw and wider than the narrow range Rn described above are connected by overlapping portions in each information. Compared to the case where the entire measurement range formed as a whole is wide-range three-dimensional measurement information, more accurate combined three-dimensional information can be created.

  In addition, the wide range 3D image Iw (wide range 3D measurement information) and the narrow range 3D image In (narrow range 3D measurement information) measured by the intraoral 3D measurement method described above are superimposed and displayed on the monitor 30. Since the narrow range 3D image In can be synthesized while being superimposed on the wide range 3D image Iw, it can be operated while visually confirming the synthesis status of the narrow range 3D image In, and the synthesized 3D information can be created more reliably. can do.

  In addition, the handy scanner 10 includes a light source 111, a pattern generation unit 112 that converts the projection light Lt emitted from the light source 111 toward the tooth T, which is a measurement object, into structured light having a desired pattern, and a light source The projection light Lt emitted from 111 is guided to the dental arch Da, and the light guide path 130 (130a, 130b, 130c, 130e) for guiding the reflected light Lr from the dental arch Da and the projection light are emitted. Since the imaging unit 113 that captures the irradiated field, the light source 111, the pattern generation unit 112, and the imaging unit 113 are provided and the housing 110 that can be gripped is provided, the measurement range in the narrow oral cavity is increased. Three-dimensional measurement can be performed with high accuracy.

Further, in the case of the handy scanner 10 using the tip unit 120 (120a, 120b) capable of changing the measurement range in the measurement range by attaching / detaching the housing 110, the tip unit 120 is simply attached / detached and replaced. By switching between a wide measurement range and a narrow measurement range, the entire measurement range can be measured three-dimensionally with high accuracy using a single handy scanner.
In addition, it is preferable to further include a desorption error detection unit 50 that detects the desorption error d of the tip unit 120 (120a, 120b) and a measurement result correction unit 23 that corrects the measurement result based on the desorption error d.

In addition, as shown in FIG. 5, an additional light guide path 130c is built in, and an attachment 120c that is attached to and detached from the wide-area tip unit 120a attached to the housing 110 to change the measurement range in the measurement range is provided. By using the handy scanner 10, it is possible to switch between a wide measurement range and a narrow measurement range by simply attaching and detaching the attachment 120c, and three-dimensionally measuring the entire measurement range with high accuracy using a single handy scanner. Can do.
In addition, it is preferable to further include a detachment error detection unit 50 that detects a detachment error d ′ of the attachment 120c, and a measurement result correction unit 23 that corrects a measurement result based on the detachment error d ′.

  Further, as shown in FIG. 6, an optical path switching unit 60 that switches a light guide path to be guided among a wide-range light guide path 130 a that measures a wide range and a narrow-range light guide path 130 b that measures a narrow range is provided. In the case of the handy scanner 10 equipped with the tip unit 120d provided, the entire measurement range can be accurately tertiary using a single handy scanner by simply switching between a wide measurement range and a narrow measurement range with a simple structure. The original measurement can be performed.

  In addition, the handy scanner 10 includes a position information acquisition unit 40 and performs a position information acquisition step of acquiring the position information of each of the narrow-range three-dimensional measurement information and the wide-range three-dimensional measurement information, thereby creating a combined three-dimensional information creation step (step s3). , T5, u8), by adjusting the combined three-dimensional information based on the position information acquired in the position information acquiring step, more accurate and accurate combined three-dimensional information can be created.

  In addition, as shown in FIG. 8, a plurality of wide-range three-dimensional measurement information is arranged using the common wide-range position information in adjacent wide-range three-dimensional measurement information as a connection reference, and the total measurement information of the entire measurement range is obtained. By performing the entire combined measurement information creation step (steps t3, u3) to be created, accurate combined three-dimensional information can be created even in a wider measurement range.

  Further, as shown in FIG. 9, at least one of the plurality of narrow-range three-dimensional measurement information includes narrow-range three-dimensional measurement information (adjustment) including information on a location corresponding to the overlap location Rr serving as the connection reference. Narrow-range three-dimensional measurement information), and the overall combined measurement information is adjusted based on the narrow-range three-dimensional measurement information (adjusted narrow-range three-dimensional measurement information) in the combined three-dimensional information creation step (steps s3, t5, u8). By performing the overall connection measurement information adjustment step (step u7), the overall connection measurement information is adjusted based on clearer feature location information, so even more accurate combined three-dimensional even in a wider measurement range Information can be created.

  Further, as shown in FIG. 10, by displaying the wide-range three-dimensional image Iw and the narrow-range three-dimensional image In superimposed on the monitor 30, so that at least one of brightness, color, luminance, and display pattern is different, Since the narrow-range three-dimensional image In superimposed on the wide-range three-dimensional image Iw can be clearly recognized, synthetic three-dimensional information can be created more accurately.

In correspondence between the configuration of the present invention and the above-described embodiment,
The wide-range three-dimensional measurement information acquisition process of the present invention corresponds to steps s1, t1, and u1,
Similarly,
The narrow-range three-dimensional measurement information acquisition step corresponds to steps s2, t4, u4,
The synthetic 3D information creation process corresponds to steps s3, t5, u8,
Wide range 3D image information corresponds to wide range 3D image Iw,
Narrow range 3D image information corresponds to the narrow range 3D image In,
The combined 3D image information corresponds to the combined 3D image Ic,
The overwriting process corresponds to steps s5, t7, u10,
The overall connection measurement information creation process corresponds to steps t3 and u3,
The adjusted narrow range three-dimensional measurement information corresponds to the narrow range three-dimensional measurement information including information on the location corresponding to the overlap location Rr,
The overall connection measurement information adjustment process corresponds to step u7,
The measurement information acquisition unit and the three-dimensional measurement device correspond to the handy scanner 10,
The combined 3D information creation unit corresponds to the control / arithmetic unit 21,
The position information acquisition unit corresponds to the position information acquisition unit 40,
The object to be measured corresponds to the dental arch Da,
The light guide path corresponds to the light guide path 130, the light guide path 130a for a wide range, the light guide path 130b for a narrow range, the additional light guide path 130c, and the range adjustment light guide path 130e,
The imaging element corresponds to the imaging unit 113,
The wide light guide path corresponds to the wide light guide path 130a,
The narrow-range light guide path corresponds to the narrow-range light guide path 130b,
The switching means corresponds to the optical path switching unit 60,
The attachment / detachment exchange unit corresponds to the tip unit 120 (120a, 120b),
The present invention is not limited to the configuration of the embodiment described above, and many embodiments can be obtained.
For example, in the above description, the entire dental arch Da is used as the desired measurement range, but may be a part of the dental arch Da, or the entire edentulous jaw or a part thereof.

The above-mentioned position information may be constituted by not only the position information acquisition unit 40 such as GPS but also a position sensor that measures a relative position with respect to the oral cavity. Alternatively, the position information may be acquired using an acceleration sensor, a speed sensor, a gyro sensor, an orientation sensor, a posture sensor, or a combination of the above various sensors.
Furthermore, the handy scanner 10 may include a light source for illumination in addition to the light source 111.

  In the above description, the narrow range 3D in which the measurement information in the range is arranged in the wide range 3D measurement information (wide range 3D image Iw) in which the narrow range 3D measurement information (narrow range 3D image In) is arranged. Although the overwriting process (steps s5, t7, u10) is performed with the measurement information (narrow range three-dimensional image In), it is not necessary to perform the overwriting process by performing only the overlaying process.

DESCRIPTION OF SYMBOLS 1 ... Intraoral three-dimensional measuring device 10 ... Handy scanner 21 ... Control and calculation device 40 ... Position information acquisition part 60 ... Optical path switching part 110 ... Case 111 ... Light source 112 ... Pattern generation part 113 ... Imaging part 120, 120d, 120e ... tip unit 120a ... tip unit 120b for wide area ... tip unit 120c for narrow area ... attachment 130 ... light guide path 130a ... light guide path 130b for wide area ... light guide path 130c for narrow area ... additional light guide path 130e ... range adjustment guide Optical path Da ... Dental arch Ic ... Synthetic 3D image In ... Narrow range 3D image Iw ... Wide range 3D image Lr ... Reflected light Lt ... Projection light

Claims (20)

A wide-range 3D measurement information acquisition step for acquiring wide-range 3D measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity,
A narrow range three-dimensional measurement information acquisition step of acquiring a plurality of narrow range three-dimensional measurement information obtained by measuring a three-dimensional shape of a narrow range narrower than the wide range in the measurement range;
The narrow-range three-dimensional measurement information is arranged based on the wide-range three-dimensional measurement information using the common information in the measurement range in the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information as a synthesis reference, and the measurement range 3D measurement method in the oral cavity which performs a synthetic 3D information creation step for creating a composite 3D information. The wide range 3D measurement information is composed of wide range 3D image information obtained by measuring and imaging the wide range 3D shape,
The narrow range three-dimensional measurement information is composed of narrow range three-dimensional image information obtained by imaging the narrow range measurement result,
In the synthetic three-dimensional information creation step,
The intraoral three-dimensional measurement method according to claim 1, wherein synthetic three-dimensional image information imaged based on the synthetic three-dimensional information is created. In the narrow range three-dimensional measurement information acquisition step,
The intraoral 3D measurement method according to claim 1 or 2, wherein the narrow range 3D measurement information is measured with a higher resolution than the wide range 3D measurement information. In the synthetic three-dimensional information creation step,
The oral cavity according to any one of claims 1 to 3, wherein the combined three-dimensional information is created by using characteristic location information common to the narrow-range three-dimensional measurement information and the wide-range three-dimensional measurement information as the position information in the measurement range. 3D measurement method. Performing a position information acquisition step of acquiring position information of each of the narrow range three-dimensional measurement information and the wide range three-dimensional measurement information;
In the synthetic three-dimensional information creation step,
The intraoral three-dimensional measurement method according to any one of claims 1 to 4, wherein the synthetic three-dimensional information is adjusted based on the position information acquired in the position information acquisition step. In the synthetic three-dimensional information creation step,
6. The overwriting process according to claim 1, wherein the narrow range 3D measurement information in which the measurement information of the corresponding range in the wide range 3D measurement information in which the narrow range 3D measurement information is arranged is overwritten. Intraoral three-dimensional measurement method. The wide-range three-dimensional measurement information
The intraoral three-dimensional measurement method according to any one of claims 1 to 6, wherein the measurement information is total measurement information obtained by measuring an entire shape in the measurement range. Whole joint measurement information for creating a whole joint measurement information of the whole measurement range by arranging a plurality of the wide range three-dimensional measurement information using the common wide-range position information in the adjacent wide-range three-dimensional measurement information as a joining reference The intra-oral three-dimensional measurement method according to claim 1, wherein the creation step is performed. At least one of the plurality of narrow range three-dimensional measurement information is adjusted narrow range three-dimensional measurement information including measurement information of a range corresponding to the wide range position information,
The intraoral 3D according to claim 8, wherein an overall joint measurement information adjustment step of adjusting the overall joint measurement information based on the adjusted narrow range three-dimensional measurement information arranged in the composite three-dimensional information creation step is performed. Measurement method.   An intra-oral three-dimensional measurement that is measured by the intra-oral three-dimensional measurement method according to any one of claims 1 to 9 and images and displays the wide range three-dimensional measurement information and the narrow range three-dimensional measurement information in a superimposed manner. How to display the results. The wide range three-dimensional measurement information and the narrow range three-dimensional measurement information to be superimposed and displayed as an image,
The display method of the intraoral three-dimensional measurement result according to claim 10, wherein the display is performed so that at least one of brightness, color, brightness, and display pattern is different. A measurement information acquisition unit that acquires a wide range of 3D measurement information obtained by measuring a wide range of shapes in a desired measurement range in the oral cavity and a plurality of narrow range 3D measurement information obtained by measuring a 3D shape of a narrow range narrower than the wide range. When,
The narrow-range three-dimensional measurement information is arranged based on the wide-range three-dimensional measurement information using the common information in the measurement range in the wide-range three-dimensional measurement information and the narrow-range three-dimensional measurement information as a synthesis reference, and the measurement range An intraoral three-dimensional measuring apparatus comprising a synthetic three-dimensional information creating unit that creates synthetic three-dimensional information. The wide range 3D measurement information is composed of wide range 3D image information obtained by measuring and imaging the wide range 3D shape,
The narrow range three-dimensional measurement information is composed of narrow range three-dimensional image information obtained by imaging the narrow range measurement result,
The intra-oral three-dimensional measurement apparatus according to claim 12, wherein the synthetic three-dimensional information creating unit creates synthetic three-dimensional image information imaged based on the synthetic three-dimensional information. The intraoral 3D measurement apparatus according to claim 12 or 13, wherein the narrow range 3D measurement information is measured with a higher resolution than the wide range 3D measurement information. The synthetic three-dimensional information creation unit
15. The compositional 3D information is created by using the characteristic location information common to the narrow range 3D measurement information and the wide range 3D measurement information as the position information within the measurement range. The intraoral three-dimensional measuring apparatus as described. A position information acquisition unit that acquires position information of each of the narrow-range three-dimensional measurement information and the wide-range three-dimensional measurement information;
The intraoral cavity according to any one of claims 12 to 15, wherein the combined three-dimensional information creating unit is configured to adjust the combined three-dimensional information based on the position information acquired by the position information acquiring unit. Three-dimensional measuring device. The measurement information acquisition unit
A light source that irradiates projection light toward the object to be measured, an image sensor that captures an irradiation field irradiated with the projection light, and a light guide path that guides reflected light from the object to be measured to the image sensor. The intraoral three-dimensional measurement according to any one of claims 12 to 16, wherein the three-dimensional measurement device includes a light source, the light guide path, and the imaging element, and a three-dimensional measuring device including a graspable housing. apparatus. The light guide path,
Wide light guide path that measures a wide area,
With a narrow range light guide path that measures a narrow range,
The intraoral three-dimensional measurement apparatus according to claim 17, further comprising a switching unit that switches a light guide path to be guided among the wide-range light guide path and the narrow-range light guide path. 19. The intraoral three-dimensional measurement according to claim 17, wherein a part of the housing includes at least the light guide path and is configured to be a detachable / exchanger that can change a measurement range in the measurement range by detachment and replacement. apparatus. The structure according to claim 17 or 18, further comprising an attachment that is configured to be detachable from the housing, includes at least the light guide path, and is attached to and detached from the housing to change a measurement range in the measurement range. The intraoral three-dimensional measuring apparatus as described.

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