CN101711675B - Device for measuring geometric shapes of teeth - Google Patents
Device for measuring geometric shapes of teeth Download PDFInfo
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- CN101711675B CN101711675B CN200910176268XA CN200910176268A CN101711675B CN 101711675 B CN101711675 B CN 101711675B CN 200910176268X A CN200910176268X A CN 200910176268XA CN 200910176268 A CN200910176268 A CN 200910176268A CN 101711675 B CN101711675 B CN 101711675B
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Abstract
The invention discloses a device for measuring geometric shapes of teeth, which comprises a handle and a probe, wherein a light source, two projecting heads and an imaging unit are arranged in the probe; reticular geometric figure images are arranged on the projecting heads; incident light emitted by the light source irradiates on the projecting heads; the projecting heads project the reticular geometric figure images with the same shape alternately by angles of a symmetrical triangle to the surfaces of the teeth to form different distorted reticular geometric figure images; two different distorted reticular geometric figure images are reflected by the surfaces of the teeth into the imaging unit; and the range of a perspective angle between projecting light rays and imaging light rays is +/-10 degrees- +/-30 degrees. The invention is characterized in that a camera is arranged between the two projecting heads, the range of the perspective angle between the projecting light rays and the imaging light rays is +/-10 degrees- +/-30 degrees, and the distorted reticular geometric figure images are formed under a large perspective angle (which can be larger than 30 degrees), thereby effectively preventing the reticular geometric figure images from generating shadows and improving the measuring sensitivity and accuracy.
Description
The application is that original applying number is dividing an application of 200810061900.1 application for a patent for invention, and its applying date is on May 23rd, 2008, and denomination of invention is " being used to measure the device of geometric shapes of teeth ".
Technical field
The present invention relates to a kind of optical measuring device, especially relate to a kind of device that is used to measure geometric shapes of teeth.
Background technology
The optical measuring device that has occurred many patients of being used for oral cavity inner teeth gear at present, CEREC (the Chair-side Economic Reconstruction of Esthetic Ceramic that makes as the Sirona company that separates from Siemens, digitized clinical repair system) device, this device adopts graphic projection's commercial measurement technology of generally using, the parallel grid of light and dark linear striped is incident upon on the surface of tooth, and with the parallax angle be imaged on the two dimension CCD (Charge Coupled Device, charge-coupled image sensor) on the photographing unit, can obtain the relative altitude or the relative depth of tooth from the curvature of linear striped, the digital image data of tooth adopts and utilizes the phase shift of sinusoidal grating or phase place analytic technique to handle; Wherein, the phase place of linear striped moves 0 °, 90 °, 180 ° or 270 ° of acquisitions by displacement bimorph method or additive method, thereby obtains the relative phase of the every bit on the parallel network; And reduce or eliminated the background noise and the intensity disturbance of linear striped by filtering or smoothing technique.This device can offer CAD/CAM (Computer Aided Design for tooth reconstruction preferably, computer-aided design/Computer Aided Manufacturing, computer aided manufacturing) handles the digital image data that must use and need not to do tooth model, but there is significant disadvantages in this device: a) because the coherence of light, utilize the phase shift analytic technique of sinusoidal grating seriously to be limited by speckle point situation, cause the high blur of the digitized video of tooth thus; B) this device reduces or has eliminated the background noise and the intensity disturbance of linear striped by filtering or smoothing technique, but greatly reduces the resolution of the digitized video of tooth simultaneously; C) the phase shift analytic technique is applied in the fixed parallel grid, (differing greater than 2 π) when the height of tooth is undergone mutation to cause linear fringe shift greater than the net distance, need more projection or change net apart from compensating this defective, thereby make that the structure of this device is more complicated, caused the uncertainty of digital image data simultaneously.
Except above-mentioned shortcoming, there is common defective in the optical measuring device that comprises above-mentioned CEREC device, because the parallax angle is a very important parameter, the parallax angle is big more, and then the sensitivity of Ce Lianging is just high more, but shadow problem is just serious more simultaneously, in order to eliminate shade as much as possible, optical measuring device is selected usually less than 10 °, even littler parallax angle, but has greatly reduced the certainty of measurement of tooth like this.
Summary of the invention
Technical problem to be solved by this invention provides a kind of compact conformation, cost is low, power consumption is little, long service life, and can improve netted geometric figure image resolution, measure sensitivity and precision, effectively avoid netted geometric figure image the device that is used to measure geometric shapes of teeth of shade to occur.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of device that is used to measure geometric shapes of teeth, this device comprises handle and the probe that is connected with described handle, be provided with two mirror symmetry light sources, mirror symmetry two projection head in the described probe and be arranged on two image-generating units between the projection head, described projection head is provided with netted geometric figure image, is provided with power supply circuits that are connected with described light source and the image processing circuit that is connected with described image-generating unit in the described handle; Described light source sends incident illumination and is mapped on the described projection head, described projection head alternately projects the netted geometric figure image of the different separately distortion of formation on the dental surface with the angle of the symmetrical triangle netted geometric figure image that shape is identical, netted geometric figure image by the dental surface distortion that two width of cloth are different reflexes in the described image-generating unit, the netted geometric figure image of the distortion that described image-generating unit is different with described two width of cloth is transferred to outer computer, calculate the tooth profile by described outer computer according to known phase bit stripping algorithm or rendering algorithm, described projection head projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of described image-generating unit is ± 10 °～± 30 °; Described projection head comprises the gradient projection lens, described gradient projection lens are provided with netted geometric figure image, described image-generating unit comprises photographic head and imaging len, and described photographic head and described imaging len are between described gradient projection lens; The incident illumination that described light source sends is mapped on the inner reflection surface of described probe, described incident illumination shines on the described gradient projection lens after the inner reflection surface reflection of described probe, described gradient projection lens alternately project the netted geometric figure image that forms distortion on the dental surface with netted geometric figure image with the angle of symmetrical triangle, image in the described photographic head by described imaging len from the light of dental surface reflection.
Described photographic head periphery is provided with one group of ring-shaped distributed illuminating lamp that is used for the Enhanced Imaging illumination.
Described light source is a white light source, and described photographic head adopts RGB (Red Green Blue, RGB) color chips.
Described light source is LED (Light Emitting Diode, light emitting diode) lamp or a laser instrument, and described photographic head adopts monochromatic black and white chip.
Described projection head projects the projection ray of dental surface and the perspective angle that reflexes to from dental surface between the imaging light of described image-generating unit is ± 20 °.
Compared with prior art, the invention has the advantages that this device compared with prior art, this apparatus structure more simple compact, cost is low, power consumption is little, long service life, no moving-member, the netted geometric figure image resolution that the while is higher than having with existing transmission-type liquid crystalline phase; Photographic head is arranged between two projection head and projection head projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of image-generating unit is ± 10 °～± 30 °, the netted geometric figure image of distortion forms down big perspective angle (can spend greater than 30), not only avoid netted geometric figure image the phenomenon of shade to occur effectively, and improved measurement sensitivity and precision; The netted geometric figure image of the distortion of obtaining by this device is 24: 23: 12 with the image ratio in the computer of tooth reconstruction system: the phase bit stripping algorithm of 6 ratios is adjusted processing, forms thick, accurate measurement amount, has avoided the uncertainty of data.
Description of drawings
Fig. 1 is the structural representation one of apparatus of the present invention;
Fig. 2 is the structural representation two of apparatus of the present invention;
Fig. 3 is the sketch map one of the tooth reconstruction system of application apparatus of the present invention;
Fig. 4 is the sketch map two of the tooth reconstruction system of application apparatus of the present invention.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one: as shown in Figure 1, a kind of device that is used to measure geometric shapes of teeth, this device comprises handle 7 and the probe 8 that is connected with handle 7, be provided with two mirror symmetry light sources 1 in the probe 8, two mirror symmetry projection head and be arranged on two image-generating units between the projection head, projection head comprises gradient projection lens 2, gradient projection lens 2 are provided with netted geometric figure image, image-generating unit comprises photographic head 5 and imaging len 4, photographic head 5 and imaging len 4 are provided with power supply circuits 71 that are connected with light source 1 and the image processing circuit 72 that is connected with image-generating unit in the handle 7 between gradient projection lens 2; The incident illumination that light source 1 sends is mapped on the inner reflection surface of probe 8, incident illumination shines on the gradient projection lens 2 after 8 the inner reflection surface reflection of popping one's head in, gradient projection lens 2 alternately project netted geometric figure image with the angle of symmetrical triangle the netted geometric figure image that forms distortion on the surface of tooth 6, the netted geometric figure image of the distortion on the surface of tooth 6 images in the photographic head 5 by imaging len 4, the netted geometric figure image that photographic head 5 will twist is transferred to outer computer, calculate the tooth profile by outer computer according to known phase bit stripping algorithm or rendering algorithm, projection head projects the projection ray of dental surface and the perspective angle that reflexes to from dental surface between the imaging light of image-generating unit is ± 20 °, this structure makes the netted geometric figure image of distortion form down big perspective angle (can spend greater than 30), avoid netted geometric figure image the phenomenon of shade to occur effectively, and improved measurement sensitivity.Directly carry out the incident illumination that reflection source sends in the present embodiment, make that probe 8 internal structures are more simple by 8 the inner reflection surface of popping one's head in.
Light source in the present embodiment is a white light source, and at this moment, the RGB color chips is adopted in the inside of video camera; When light source is LED or laser, then monochromatic black and white chip is adopted in the inside of video camera.Video camera can be CCD (Charge CoupledDevice, charge-coupled image sensor) video camera or CMOS (Complementary Metal-Oxide Semiconductor, complementary metal oxide semiconductors (CMOS)) video camera.
The netted geometric figure image that is arranged on the gradient projection lens 2 in the present embodiment can be engraved on the gradient projection lens by the method for photoetching method or directly mint-mark.
Fig. 3 has provided the sketch map of using the tooth reconstruction system of apparatus of the present invention, be engraved on netted geometric figure image on the gradient projection lens after the projection and imaging of this device 111, the netted geometric figure image that is recorded in the distortion in the photographic head is transferred to computer 112 by USB (Universal Serial Bus, USB (universal serial bus)) data wire; 112 pairs of netted geometric figure images of computer are 24: 23: 12 with the image ratio: the phase bit stripping algorithm of 6 ratios is adjusted processing, and according to sophisticated triangulation technique, the three-dimensional surface computer of tooth is gone out, draw the tooth profile simultaneously, and the tooth profile is sent into milling machine 113 with wireless mode; Milling machine 113 is produced pottery, porcelain according to the tooth profile, or people's formula tooth, the corona of synthetic material, have a denture made, obedient tooth etc.Wherein, install the power subsystem 114 that the promising light source of 111 outer setting (LED) and video camera provide power supply at this, power subsystem 114 can comprise battery, also can comprise other power modules.Wherein, be 24: 23: 12 with the image ratio: the phase bit stripping algorithm of 6 ratios is handled the netted geometric figure image of distortion, can form essence, accurate measurement amount like this, has avoided the uncertainty of data.
Fig. 4 has provided the another kind of sketch map of the tooth reconstruction system that uses apparatus of the present invention, and different with Fig. 3 is to communicate with wireless mode between computer 112 and this device 111, has guaranteed effectively also can not communicate smoothly under the usb data line situation having; In addition, saved power subsystem 114, internal battery in this device, the battery power supply circuits interior with being arranged on handle are connected, by battery is that light source (LED lamp) and photographic head in this device 111 provides power supply, make like this this apparatus structure more simply, more compact.
Embodiment two: as shown in Figure 2, the structure of present embodiment and embodiment one is basic identical, difference only is to be provided with one group of ring-shaped distributed illuminating lamp 10 that is used for the Enhanced Imaging illumination at the photographic head periphery, can adopt 2-5 LED light emitting diode in the present embodiment; When light source (LED lamp) when closing, this group illuminating lamp makes netted geometric figure image of projection become even illumination, and at this moment, this device can be used as two D cameras and uses.
Claims (5)
1. device that is used to measure geometric shapes of teeth, this device comprises handle and the probe that is connected with described handle, it is characterized in that being provided with in the described probe two mirror symmetry light sources, mirror symmetry two projection head and be arranged on two image-generating units between the projection head, described projection head is provided with netted geometric figure image, is provided with power supply circuits that are connected with described light source and the image processing circuit that is connected with described image-generating unit in the described handle; Described light source sends incident illumination and is mapped on the described projection head, described projection head alternately projects the netted geometric figure image of the different separately distortion of formation on the dental surface with the angle of the symmetrical triangle netted geometric figure image that shape is identical, netted geometric figure image by the dental surface distortion that two width of cloth are different reflexes in the described image-generating unit, the netted geometric figure image of the distortion that described image-generating unit is different with described two width of cloth is transferred to outer computer, calculate the tooth profile by described outer computer according to known phase bit stripping algorithm or rendering algorithm, described projection head projects the projection ray of dental surface and the perspective angle range that reflexes to from dental surface between the imaging light of described image-generating unit is ± 10 °～± 30 °; Described projection head comprises the gradient projection lens, described gradient projection lens are provided with netted geometric figure image, described image-generating unit comprises photographic head and imaging len, and described photographic head and described imaging len are between described gradient projection lens; The incident illumination that described light source sends is mapped on the inner reflection surface of described probe, described incident illumination shines on the described gradient projection lens after the inner reflection surface reflection of described probe, described gradient projection lens alternately project the netted geometric figure image that forms distortion on the dental surface with netted geometric figure image with the angle of symmetrical triangle, image in the described photographic head by described imaging len from the light of dental surface reflection.
2. the device that is used to measure geometric shapes of teeth according to claim 1 is characterized in that described photographic head periphery is provided with one group of ring-shaped distributed illuminating lamp that is used for the Enhanced Imaging illumination.
3. the device that is used to measure geometric shapes of teeth according to claim 1 and 2 is characterized in that described light source is a white light source, and described photographic head adopts the RGB color chips.
4. the device that is used to measure geometric shapes of teeth according to claim 1 and 2 is characterized in that described light source is LED lamp or laser instrument, and described photographic head adopts monochromatic black and white chip.
5. the device that is used to measure geometric shapes of teeth according to claim 1 is characterized in that described projection head projects the projection ray of dental surface and the perspective angle that reflexes to from dental surface between the imaging light of described image-generating unit is ± 20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910176268XA CN101711675B (en) | 2008-05-23 | 2008-05-23 | Device for measuring geometric shapes of teeth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910176268XA CN101711675B (en) | 2008-05-23 | 2008-05-23 | Device for measuring geometric shapes of teeth |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810061900A Division CN100581461C (en) | 2008-05-23 | 2008-05-23 | Device for detecting tooth geometrical shape |
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| Publication Number | Publication Date |
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| CN101711675A CN101711675A (en) | 2010-05-26 |
| CN101711675B true CN101711675B (en) | 2011-12-14 |
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| CN200910176268XA Expired - Fee Related CN101711675B (en) | 2008-05-23 | 2008-05-23 | Device for measuring geometric shapes of teeth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107847147A (en) * | 2015-08-05 | 2018-03-27 | 阿拉姆胡维斯有限公司 | For obtaining the devices and methods therefor of personal health information |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107072762B (en) * | 2015-05-06 | 2020-07-07 | 北京大学口腔医学院 | Oral cavity detection and data processing device and method and oral cavity detection system |
| CN106859605A (en) * | 2017-03-27 | 2017-06-20 | 北京唯诺卡科技有限公司 | A kind of device for detecting dental surface state |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236431A (en) * | 1996-09-02 | 1999-11-24 | 叙林克斯医学技术有限公司 | Optical imaging method and device |
| CN1748120A (en) * | 2003-02-06 | 2006-03-15 | 株式会社高永科技 | Thrre-dimensional image measuring apparatus |
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2008
- 2008-05-23 CN CN200910176268XA patent/CN101711675B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236431A (en) * | 1996-09-02 | 1999-11-24 | 叙林克斯医学技术有限公司 | Optical imaging method and device |
| CN1748120A (en) * | 2003-02-06 | 2006-03-15 | 株式会社高永科技 | Thrre-dimensional image measuring apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107847147A (en) * | 2015-08-05 | 2018-03-27 | 阿拉姆胡维斯有限公司 | For obtaining the devices and methods therefor of personal health information |
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| CN101711675A (en) | 2010-05-26 |
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