JP7356093B2 - Intraoral X-ray equipment - Google Patents

Description

The present invention relates to an intraoral X-ray imaging device that can be suitably used in intraoral X-ray imaging.

In the dental field, intraoral X-ray photography is widely used as a method for confirming the condition of a patient's teeth. As an imaging method for such X-ray photography, an intraoral method is widely known in which a photoreceptor is placed in the mouth and X-rays are irradiated from the outside to expose the photoreceptor.

As an instrument used in intraoral procedures, for example, a dental X-ray imaging instrument disclosed in Patent Document 1 is known.

The dental X-ray imaging device disclosed in Patent Document 1 includes a film holding spring that holds an X-ray film and a guide ring that serves as a reference when positioning the X-ray tube (cone of the X-ray device). , these are arranged on one end side and the other end side of the retention plate, respectively.

This dental X-ray imaging device places an X-ray film held by a film presser spring inside the patient's (person to be imaged)'s mouth, and a part of the film presser spring side, which is one end side of the retention plate, is placed above and below the patient. Use while biting with your teeth. At this time, the retaining plate extends from the inside of the patient's mouth to the outside of the patient's mouth, and the guide ring is placed outside the patient's mouth. Then, the photographer aligns the X-ray tube with the guide ring, irradiates X-rays, and executes imaging.

Japanese Patent Application Publication No. 2004-174162

When taking intraoral X-rays in medical settings, the proximal surfaces of the crowns of two adjacent teeth or the roots of the teeth overlap, and the parts that the doctor wants to confirm are not captured. There were times when we had to reshoot.

When performing such re-imaging, it is necessary to finely adjust the direction of X-ray irradiation. That is, from the initial imaging state (see FIG. 30(a)), the patient is asked to open his mouth, and the overall posture of the X-ray imaging device 300 is slightly changed.

Specifically, for example, when tilting the X-ray irradiation direction (the direction indicated by the arrow in FIG. 30) so that the irradiation source approaches the mesial side of the tooth, the guide ring 301 slightly approaches the mesial side of the tooth. The overall posture of the X-ray imaging device 300 is changed as shown in FIG. 30(b). On the other hand, when tilting the X-ray irradiation direction (the direction indicated by the arrow in FIG. 30) so that the irradiation source is closer to the distal side of the tooth, the guide ring 301 is taken slightly closer to the distal side of the tooth. For example, the overall posture of the tool 300 is changed (see FIG. 30(c)).

In any case, it is necessary to have the patient open his mouth and finely adjust the overall posture of the X-ray imaging tool 300, and then have the patient bite the X-ray imaging tool 300 again. Thereafter, the position of the X-ray tube 302 is aligned with the position of the guide ring 301, and imaging is performed again.

However, the preparatory work for re-imaging by slightly moving the entire X-ray imaging tool 300 to finely adjust its posture is a work that requires skill and must be performed by a skilled person. Therefore, there has been a desire for a photographic instrument that can reduce the time and effort required for preparatory work and that can be operated even by an unskilled person.

In addition, since the shapes of human teeth are significantly different between front teeth and back teeth, conventional X-ray imaging instruments have been designed to be used for shooting back teeth and one for shooting front teeth, and it has been necessary to use these separately. That is, with the one for photographing back teeth, it is possible to firmly bite when chewing with the upper and lower molar teeth, but it is not possible to firmly bite when chewing with the upper and lower front teeth. On the other hand, with the one for front teeth photography, it is possible to firmly bite when chewing with the upper and lower front teeth, but it is not possible to firmly bite when chewing with the upper and lower back teeth.

Therefore, it is an object of the present invention to provide a highly versatile intraoral X-ray imaging instrument that can be used for imaging various teeth in intraoral X-ray imaging.

In order to solve the above problem, the invention according to claim 1 includes: a clamping part that can be clamped between upper and lower teeth; a reference part that serves as a reference when determining an X-ray irradiation direction; and the clamping part and the reference part. An intraoral X-ray imaging instrument that is used with the reference part placed outside the mouth, and includes an arm part extending between The arm part has an arm side engaging part, and the arm part has an arm side engaging part and one of the reference part side engaging parts selected from the plurality of reference part side engaging parts. The reference part is attached to the arm part by engaging with the connecting part, and by changing the reference part side engaging part to be engaged with the arm side engaging part, the reference part is attached to the holding part. The direction of the reference part can be changed, and the plurality of reference part side engaging parts are a first ring side engaging part, a second ring side engaging part, and a third ring side engaging part, and the arm By engaging the side engaging part and the first ring side engaging part, the reference part assumes a reference posture, and by engaging the arm side engaging part and the second ring side engaging part, The reference part assumes a mesial attitude, and by engaging the arm side engaging part and the third ring side engaging part, the reference part assumes a distal attitude, and changes from the reference attitude to the distal attitude. The intraoral X-ray imaging instrument is characterized in that the reference portion is shifted in the opposite direction from the reference position to the mesial position.
In the invention according to claim 2, the reference part is continuous in an annular shape, and the reference part is located at a position separated from the first ring-side engaging part by a predetermined angle on one side in the circumferential direction of the reference part. A second ring-side engaging portion is provided, and a third ring-side engaging portion is provided at a position separated from the first ring-side engaging portion by the predetermined angle on the opposite side of the reference portion in the circumferential direction. , the first ring-side engaging portion, the second ring-side engaging portion, and the third ring-side engaging portion have different extending directions in the portions that engage with the arm-side engaging portion; The ring-side engaging portion is formed such that an angle between an imaginary line extending in the extending direction of the portion that engages with the arm-side engaging portion and a surface that is flush with the opening surface of the reference portion is 90 degrees. The second ring-side engaging portion and the third ring-side engaging portion are arranged such that an imaginary line extending in the extending direction of the portion that engages with the arm-side engaging portion and the opening surface of the reference portion are on the same plane. 2. The intraoral X-ray imaging instrument according to claim 1, wherein the angle formed by the plane is an acute angle.
In the invention according to claim 3, the holding part has a contact part with which the teeth abut from the outside while being held between the upper and lower teeth, and the contact part has a first groove extending in a predetermined direction. and a second groove extending in a direction intersecting the first groove, and an outer portion of the contact portion has an uneven shape due to the groove portion. The intraoral X-ray imaging device according to item 1 or 2.
The invention according to claim 4 is the intraoral X-ray imaging instrument according to claim 3, wherein the plurality of first grooves and the plurality of second grooves form a series of lattice-shaped grooves. be.
In the invention according to claim 5, the holding part has a piece holding part that holds the occlusal piece on the opposite side of the abutting part in the up-down direction during use, and the abutting part has a piece holding part that holds the occlusal piece on the opposite side of the abutting part in the up-down direction during use; A claim characterized in that the protrusion protrudes in a convex manner, has a curved surface in the shape of a mountain on the protruding end side, which is interrupted by the groove portion, and the protrusion length becomes shorter from the center portion to the edge portion. 4. The intraoral X-ray imaging device according to 3 or 4.
The invention related to the present invention includes: a clamping part that can be clamped between upper and lower teeth; a reference part that serves as a reference for determining the direction of X-ray irradiation; and an arm part that extends between the clamping part and the reference part; An intraoral X-ray photographing instrument that includes a holding part that holds an X-ray detection medium and is used with the reference part placed outside the mouth, the holding part being held between the upper and lower teeth. It has a contact portion with which the teeth come into contact, and the contact portion has a plurality of groove portions formed therein, including a first groove extending in a predetermined direction and a second groove extending in a direction intersecting the first groove. The intraoral X-ray imaging instrument is characterized in that an outer portion of the abutting portion has an uneven shape formed by the groove portion.

The intraoral X-ray imaging instrument according to the related invention of the present invention makes it possible to firmly hold the clamping portion both when biting with the upper and lower front teeth and when biting with the upper and lower back teeth.

In the intraoral X-ray imaging instrument of the related invention described above, it is preferable that the plurality of first grooves and the plurality of second grooves form a series of lattice-shaped grooves.

In the related invention described above , it is preferable that the abutting portion protrudes outward and has a curved surface in the shape of a mountain interrupted by the groove portion on the protruding end side.

This configuration is preferable because the uneven portion can be brought into more secure contact with the uneven portion of the teeth when chewing with the front teeth and when chewing with the back teeth.

In the preferred embodiment of the intraoral X-ray imaging instrument, it is further preferable that the protruding length of the abutting portion decreases from the center portion to the edge portion.

In the related invention described above, the reference part has a plurality of reference part-side engaging parts, the arm part has an arm-side engaging part, and the arm-side engaging part and the plurality of reference parts The reference part is attached to the arm part by engaging one of the reference part side engaging parts selected from the side engaging parts, and the reference part side is engaged with the arm side engaging part. It is preferable that the orientation of the reference part with respect to the holding part can be changed by changing the engaging part.

According to this configuration, it is possible to adjust the position of the reference part while the patient (person to be imaged) is biting the clamping part, and the direction of X-ray irradiation can be easily adjusted. Furthermore, since the position of the reference part can be adjusted without moving the part placed in the mouth, the position of the reference part can be adjusted without causing discomfort to the patient.

The present invention includes a clamping part that can be clamped between upper and lower teeth, a reference part that serves as a reference for determining the direction of irradiation of X-rays, an arm part that extends between the clamping part and the reference part, and an X-ray detection medium. An intraoral X-ray imaging instrument that is used with the reference part placed outside the mouth, the reference part having a plurality of reference part-side engaging parts, and the reference part having a plurality of reference part-side engaging parts; has an arm-side engaging portion, and engages the arm-side engaging portion with one of the reference portion-side engaging portions selected from the plurality of reference portion-side engaging portions. The reference part is attached to the reference part, and by changing the reference part side engaging part to be engaged with the arm side engaging part, the orientation of the reference part with respect to the holding part can be changed.

In addition, based on the above-mentioned prior art, a related invention of the present invention aims to provide an intraoral X-ray imaging device that can reduce the labor of the photographer in intraoral X-ray imaging. An intraoral X-ray device comprising a holding part, a reference part, an arm extending between the holding part and the reference part, and a holding part for holding an X-ray detection medium, and used with the reference part placed outside the mouth. In the imaging instrument, the reference part is a part that serves as a reference when determining the irradiation direction of X-rays irradiated from an external device, and the reference part is a part that serves as a reference when determining the irradiation direction of X-rays irradiated from an external device. The part rotates with the arm part from the mesial side to the distal side or from the distal side to the mesial side with respect to the holding part, and when the reference part and the arm part rotate, the holding part rotates with respect to the holding part. This is an intraoral X-ray imaging instrument characterized in that a portion rotates together with the reference portion while maintaining a relative position with the reference portion.

In the intraoral X-ray imaging device of the related invention, since the reference part rotates with the arm part from the mesial side to the distal side or from the distal side to the mesial side, It becomes possible to adjust the position of the reference part while holding the gripping part.
In other words, the position of the reference part can be adjusted without having to move and adjust the entire intraoral X-ray imaging device, and the X-ray irradiation direction can be easily adjusted, making it easier for the photographer to perform intraoral X-ray imaging. It can save you time and effort.
Furthermore, in this related invention, the relative positions of the reference part and the holding part that holds the X-ray detection medium are maintained before and after the position adjustment of the reference part. That is, before and after adjusting the position of the reference part, the intersection angle between the X-ray irradiation direction and the X-ray detection medium determined according to the reference part is maintained. From this, the photographer can perform accurate imaging with suppressed distortion simply by adjusting the position of the reference part and then determining the direction of irradiation of X-rays in accordance with the reference part.

In the related invention described above, a guide protrusion is provided on one of the holding part and the arm part, and a guide receiving part is provided on the other, and the guide protrusion is inserted into a part of the guide receiving part. As the arm portion rotates, one of the guide protrusion and the guide receiving portion moves relative to the other, and the insertion position of the guide protrusion is changed. The receiving part is provided with a plurality of protrusion holding areas for holding the guide protrusion, and the relative movement causes the guide protrusion to change from being held in one of the protrusion holding areas to the other protrusion holding area. It is preferable to transition to a state where it is held in the area.

In this configuration, when the arm portion is rotated, the guide protrusion is held in one of the plurality of protrusion holding areas of the guide receiving portion as the arm portion is rotated. Thereby, the rotation stop position of the arm portion can be set to any one of a plurality of predetermined positions.
That is, by rotating the arm part from one prescribed position to another prescribed position, it becomes possible to rotate the arm part by a predetermined angle, thereby making it easier to adjust the position of the reference part.

In the above-mentioned preferred aspect, the guide receiving part has a regulating part that protrudes more than an adjacent part, and when the arm part rotates, the regulating part comes into contact with the guide projection part and moves the relative movement. By rotating the arm section with a force above a certain level, the regulating section is temporarily pushed away by the guide protrusion, or the direction of the relative movement of the guide protrusion is changed. More preferably, it is modified and deregulated.

According to this configuration, unintended rotation of the arm portion can be prevented.

In the related invention described above, the holding part has a contact part with which the teeth abut from the outside while being held between the upper and lower teeth, and the outer part of the contact part has a first groove extending in a predetermined direction. It is preferable that a plurality of groove portions are formed including a second groove extending in a direction intersecting the first groove, and an uneven surface is formed on the outer surface of the contact portion by the groove portions.

According to such a configuration, it is possible to firmly grip the gripping portion both when the user bites with the upper and lower front teeth and when the user bites with the upper and lower back teeth, which is preferable.

In the intraoral X-ray imaging instrument configured as described above, it is further preferable that the plurality of first grooves and the plurality of second grooves form a series of lattice-shaped grooves.

In the related invention described above, the holding part has a contact part with which the teeth abut from the outside while being held between the upper and lower teeth, and the outer part of the contact part has a center part that is larger than a peripheral part. It is preferable that the shape bulges outward.

This configuration is also preferable, since it is possible to firmly grip the gripping portion both when biting with the upper and lower front teeth and when biting with the upper and lower back teeth.

According to the present invention, it is possible to provide a highly versatile intraoral X-ray imaging instrument that can be used for imaging various teeth.

FIG. 2 is a perspective view showing how an occlusal piece and an X-ray photoreceptor are attached to the indicator according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram showing how intraoral X-ray photography is performed using the indicator of FIG. 1; 2 is an exploded perspective view showing the indicator of FIG. 1. FIG. FIG. 4 is an exploded perspective view showing the indicator of FIG. 3 upside down. FIG. 4 is a perspective view showing the base end of the arm in FIG. 3 , showing an enlarged view of the guide hole. 6 is a plan view showing the guide hole in FIG. 5, in which (a) shows a state in which the guide protrusion is not inserted, and (b) to (d) show a state in which the guide protrusion is inserted into different holding areas. Indicates the state in which FIG. 4 is a perspective view showing the piece holding section of FIG. 3, in which (a) shows the state seen from above, and (b) shows the state seen from below. FIG. 4 is a perspective view showing the upper and lower tooth contact portions of FIG. 3, in which (a) shows the appearance seen from above, and (b) shows the appearance seen from below. (a) is an AA sectional view showing the holding part and the base end of the arm in FIG. 1, with the occlusal piece and holding clip omitted, and (b) is an exploded view of (a). FIG. FIG. 2 is an explanatory diagram schematically showing how the indicator in FIG. 1 is rotated, the left diagram showing the position of the indicator with respect to the lower teeth, and the right diagram showing the position of the guide protrusion with respect to the base end of the arm. It is a diagram. In addition, (a) shows the state before movement, (b) shows the guide ring moved mesially from the state shown in (a), and (c) shows the state shown in (a). The guide ring is shown moved from the state to the centrifugal side. 10(a) to the state shown in FIG. 10(b), the left diagram shows the position of the indicator relative to the lower teeth, and the right diagram shows the arm proximal end. It is a figure which shows the position of the guide protrusion part with respect to the part. (a) is an explanatory diagram schematically showing how the indicator in FIG. 1 is used for X-ray photography of anterior teeth, and (b) is an explanatory diagram schematically showing how the indicator in FIG. 1 is used for X-ray photography of back teeth. FIG. (a) is an explanatory diagram schematically showing how the clamping part of the indicator in FIG. 1 is held between the upper and lower front teeth, and (b) is an explanatory diagram schematically showing the clamping part of the indicator in FIG. FIG. 2 is an explanatory diagram schematically showing a state of biting. FIG. 6 is an explanatory diagram showing an embodiment in which the clamping part attachment member and the upper and lower tooth contact parts are movable relative to the arm base end in the up and down direction. (a) shows the state in which the clamping part attachment member and the upper and lower tooth contact parts are moved to the lowest position relative to the arm base end, and (b) shows the state in which the clamping part attachment member and the upper and lower tooth contact parts are moved to the lowest position with respect to the arm base end. The figure shows how the arm has been moved to the uppermost position relative to the base end. It is an exploded perspective view showing an indicator concerning a second embodiment of the present invention. (a) is a perspective view showing the vicinity of the base end of the arm in FIG. 15, and is an enlarged view of one guide recess, and (b) is an enlarged view of the guide recess in (a) in the width direction. FIG. 3 is a sectional view taken along line AA, showing a state cut at the center position. FIG. 16 is a perspective view showing the piece holding section of FIG. 15, in which (a) shows the state seen from above, and (b) shows the state seen from below. It is a sectional view showing how the holding part is moved relative to the arm base end in the vertical direction, and (a) shows a state in which the holding part is moved to the lowest side with respect to the arm base end; (b) shows a state in which the holding part is moved to the uppermost side with respect to the arm base end. FIG. 7 is a cross-sectional view schematically showing the positional relationship between the guide protrusion and the guide recess when the holding portion is moved relative to the arm base end in the vertical direction. (a) shows the state where the clamping part is moved to the lowest side with respect to the arm base end, and (b) shows the state where the clamping part is moved to the highest side with respect to the arm base end. . 16 is an explanatory diagram schematically showing how to rotate the indicator of FIG. 15, the left diagram shows the position of the indicator with respect to the lower teeth, and the right diagram shows the position of the guide protrusion with respect to the arm base end with black circles. It is a figure shown by. Further, (a) shows the state before movement, and (b) shows the state where the guide ring has been moved mesially from the state shown in (a). 21 is an explanatory diagram showing how the holding position of the guide protrusion shifts in the order of (a) to (c) in the rotating operation of the indicator shown in FIG. 20. FIG. It is a perspective view showing an indicator concerning a third embodiment of the present invention. FIG. 23 is a perspective view showing the indicator of FIG. 22 upside down; FIG. 23 is an explanatory diagram showing the indicator of FIG. 22, showing how a guide ring is attached to the indicator body. (a) is a perspective view showing the indicator body of FIG. 22, and (b) is an enlarged side view showing the periphery of the ring attachment part of (a). 24A and 23B are diagrams showing the upper and lower tooth contact portions of FIG. 23, in which (a) is a perspective view, (b) is a side view, and (c) is a front view. FIG. 23 is a diagram showing the guide ring in FIG. 22 in an upright position, in which (a) is a front view and (b) is a side view. 23 is an explanatory diagram showing the indicator of FIG. 22, (a) shows a state in which the posture of the guide ring is set as the reference posture, (b) shows a state in which the posture of the guide ring is set in the mesial side posture, ( c) shows a state in which the guide ring is in the distal orientation. (a) to (c), the guide ring is in an upright position, each of the first ring side engaging part to third ring side engaging part is positioned below, and the surrounding area is The left figure is a perspective view, and the right figure is a plan view of the left figure seen from above. When performing intraoral X-ray photography using a conventional dental X-ray photographing instrument, it is an explanatory diagram schematically showing how the X-ray irradiation direction is changed and the photograph is taken, and (a) to (c) are This shows how images are taken in different irradiation directions.

Hereinafter, an indicator 1 (intraoral X-ray imaging instrument) according to an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these examples. Further, the vertical direction will be explained based on the state shown in FIG. 1.

The indicator 1 of the first embodiment is used with an occlusal piece 2 and an X-ray image detection medium 3 (X-ray detection medium) attached, as shown in FIG.

The occlusal piece 2 is a substantially rectangular parallelepiped-shaped member having elasticity, made of foamed polystyrene, etc., and is a member that does not appear in the image during X-ray photography.

The X-ray image detection medium 3 is an X-ray photoreceptor such as an X-ray film (photosensitive film) or an imaging plate, and a light-shielding film that transmits X-rays and blocks sunlight; It is formed by attaching a protective cover or the like to protect it from damage, if necessary. That is, the X-ray image detection medium 3 is a member that acquires information on the X-rays that have irradiated and passed through a target substance (teeth and/or its surroundings). Therefore, instead of the above-mentioned X-ray image detection medium 3, the X-ray photoreceptor may be used as it is as an X-ray detection medium without attaching a film or the like.

The indicator 1 includes a guide ring 10 (reference part), an arm part 11, a clamping part 12, and a holding clip 13 (holding part).

The guide ring 10 includes a ring portion 10a that continues in an annular shape, and a ring attachment portion 10b provided in a part of the ring portion 10a.
Here, as shown in FIG. 2, when performing intraoral X-ray photography using the indicator 1, the operator adjusts the placement position of the cone 17 of the X-ray device 16 (external device) and It is necessary to determine the direction of X-ray irradiation. This guide ring 10 is arranged outside the mouth of the person to be photographed, and serves as a reference when adjusting the placement position of the cone 17.

That is, the operator can know the position of the X-ray image detection medium 3 placed inside the mouth of the person to be imaged by checking the position of the guide ring 10 placed outside the mouth of the person to be imaged. By arranging the cone 17 at an appropriate position with reference to the guide ring 10, it becomes possible to arrange the cone 17 at an appropriate position with respect to the X-ray image detection medium 3.

As shown in FIGS. 3 and 4, the arm portion 11 is a flat member formed by integrally forming an arm base end portion 20 and a connecting plate portion 21. This arm portion 11 is a member made of synthetic resin and has elasticity.

The arm base end portion 20 is a flat portion having a thickness in the vertical direction, and a portion on the guide ring 10 side is approximately semicircular. That is, the arm base end portion 20 has a rounded side surface portion facing the guide ring 10 that is continuous in an arc shape.

This arm base end portion 20 is provided with one first attachment hole portion 25 and two guide hole portions 26 (guide receiving portions). The first attachment hole portion 25 has a circular opening shape and is a through hole that penetrates the arm base end portion 20 in the thickness direction.

The two guide holes 26 are each long holes extending in the circumferential direction of the opening of the first attachment hole 25, and are provided symmetrically across the first attachment hole 25 when viewed from above. There is. This guide hole portion 26 is also a through hole that penetrates the arm base end portion 20 in the thickness direction.

As shown in FIG. 5, the inner wall portion of the guide hole portion 26 is provided with a protruding portion 28 (regulating portion) that protrudes inward from the periphery.
Specifically, a plurality of (four) raised parts 28 each consisting of a first raised part 28a to a fourth raised part 28d are provided on the outer side of the inner circumferential surface of the guide hole 26. They are arranged in parallel at intervals in the extending direction. Furthermore, four raised parts 28 consisting of a first raised part 28a to a fourth raised part 28d are also provided on the inner side of the inner circumferential surface of the guide hole 26, and are spaced apart from each other in the extending direction of the guide hole 26. They are arranged in parallel with space between them.

That is, the same number of raised parts 28 are provided at positions apart in the width direction of the guide hole part 26. The two first raised portions 28a, the second raised portions 28b, the third raised portions 28c, and the fourth raised portions 28d face each other at positions separated in the width direction (a state in which they are raised closer to each other). ).
A portion of the guide hole portion 26 where the two raised portions 28 separated in the width direction face each other becomes a narrowed portion that is narrower than the adjacent portion. That is, the guide hole portion 26 of this embodiment has a plurality of (four) narrowed portions.

The guide hole portion 26 is divided into five regions by four narrowed portions, as shown in FIG. 6(a). That is, the guide hole portion 26 has five holding areas 31 (protrusion holding areas) consisting of a first holding area 31a to a fifth holding area 31e.

Here, this guide hole portion 26 is a hole into which a guide projection portion 48 (see FIG. 4) of the piece holding portion 36 is inserted (details will be described later). In this embodiment, when the arm portion 11 rotates, the guide protrusion 48 moves relative to the guide hole 26 while being inserted into the guide hole 26 .

Each holding area 31 is a portion that can hold the guide protrusion 48, and is a portion into which the guide protrusion 48 is fitted.
To explain in detail, as shown in FIG. 6(a), the first holding area 31a and the fifth holding area 31e are the end-side holding area 31 formed at the end of the guide hole 26 in the extending direction. It becomes. As shown in FIG. 6(d), in this end-side holding area 31 (first holding area 31a in FIG. 6(d)), the guide protrusion 48 is located in the circumferential direction of the outer circumferential surface. More than half of the guide hole portion 26 is held in contact with the inner circumferential surface of the guide hole portion 26 . The inner wall portion of the first holding area 31a that is in close contact with the outer circumferential surface of the guide protrusion 48 has a substantially C-shape in plan view, and is located between one side and the other side of the two first protrusions 28a. do.

On the other hand, as shown in FIGS. 6(b) and 6(c), the second holding area 31b to the fourth holding area 31d are formed in the middle of the guide hole 26 in the extending direction. This is a holding area 31. As shown in FIG. 6(b), in this central holding area 31 (third holding area 31c in FIG. 6(b)), the guide protrusions 48 are spaced apart in the circumferential direction on the outer circumferential surface. The two locations are held in contact with the inner circumferential surface of the guide hole portion 26. That is, in the central holding area 31, arcuate portions that are in close contact with the outer peripheral surface of the guide protrusion 48 are formed at positions spaced apart in the width direction of the guide hole 26. This arc-shaped part is between two adjacent raised parts 28 (second raised part 28b and third raised part 28c in FIG. 6(b)), and is from the most raised part of one to the most raised part of the other. is formed in the meantime.
That is, a portion of the side surface of the raised portion 28 forms a wall surface of the holding area 31 .

The clamping part 12 is a part located between a person's upper and lower teeth when in use, and as shown in FIGS. It has a holding part connecting member 38. That is, although the details will be described later, the clamping part 12 is a part formed by connecting the piece holding part 36 and the upper and lower tooth contact parts 37 via the clamping part connecting member 38.

As shown in FIG. 7, the piece holding portion 36 is a member that extends in a substantially U-shaped cross-section, and extends upward from the flat bottom plate portion 41 and from respective positions apart in the width direction of the bottom plate portion 41. It has two side wall parts 42 that protrude. For this reason, the piece holding part 36 has one attachment groove 43 formed between the two side walls 42, and the bite piece 2 can be attached by fitting it into this attachment groove 43. This is possible (see Figure 1).

Here, the piece holding part 36 has a second attachment hole 47 that penetrates the bottom plate part 41 and a guide protrusion part 48 that projects downward from the bottom surface of the bottom plate part 41 (upwardly from the top surface in FIG. 7(b)). It is provided.

As shown in FIG. 7, in the second attachment hole portion 47, the opening area of the opening formed on the upper surface side is larger than the opening area of the opening formed on the lower surface side. That is, the second attachment hole portion 47 has a shape in which two holes with different hole diameters are connected, and is divided into an upper hole 47a and a lower hole 47b (see FIG. 7(a)). A step portion is formed between the inner circumferential surface of the upper hole 47a and the inner circumferential surface of the lower hole 47b (see FIG. 7(a)).

The two guide protrusions 48 are both substantially cylindrical protrusions, and are provided symmetrically across the second attachment hole 47 when the piece holding part 36 is viewed from below.
These two guide protrusions 48 are arranged in parallel with an interval in the longitudinal direction of the mounting groove 43.

As shown in FIG. 8, the upper and lower tooth abutting portions 37 have a mounting cylinder portion 51 formed on one side (upper side) of the disc-shaped main body portion 50, and a contact surface portion on the opposite side (lower side). 52 is formed. This upper and lower tooth contact portion 37 is a member made of synthetic resin and has elasticity.

The mounting cylinder portion 51 is a substantially cylindrical portion with a bottom, and is a portion that protrudes outward (upward) from one side (upper surface) of the main body portion 50 . The inner hole 51a of the mounting cylinder portion 51 is a bottomed hole with a circular opening portion formed on the upper surface and whose depth direction is the vertical direction.

The contact surface portion 52 is a portion that the teeth of the person to be photographed come into contact with during use, and has a generally dome-shaped overall shape. That is, the overall shape of the contact surface portion 52 is a shape that bulges outward (downward) so as to be rounded and convex, and the central portion bulges out more than the peripheral portion. ing.

Here, a plurality of first grooves 55 extending in a predetermined direction and a direction intersecting (orthogonal to) the first grooves 55 are provided on the outer surface (lower surface, upper surface in FIG. 8(b)) of the contact surface portion 52. A plurality of second grooves 56 are formed. These first grooves 55 and second grooves 56 form an uneven surface.

Specifically, the plurality of first grooves 55 each extend in the same direction, and are arranged in parallel at intervals in a direction intersecting (perpendicular to) the extending direction. Similarly, the plurality of second grooves 56 extending in a direction different from the first groove 55 extend in the same direction and are arranged in parallel at intervals. From the above, a lattice groove is formed on the outer surface of the contact surface portion 52 by the plurality of first grooves 55 and the plurality of second grooves 56. In this lattice groove, a cross groove is formed at a portion where one first groove 55 and one second groove 56 intersect.

Therefore, a square prism or triangular prism-shaped protrusion 58 is formed on the outer side of the contact surface portion 52 at a portion adjacent to each of the first groove 55 and the second groove 56 . Note that, for convenience of drawing, only some of the protrusions 58 are labeled, and other symbols are omitted.
Then, by arranging the plurality of protrusions 58 in a matrix, an uneven surface is formed on the contact surface portion 52.

The holding portion connecting member 38 has a substantially disk-shaped head 38a and a substantially cylindrical shaft portion 38b protruding downward from one main surface (lower surface) of the head 38a, which are integrally formed. It is a member formed by

As shown in FIG. 5, the holding clip 13 includes a support plate part 60 and a presser plate part 61 that protrude upward from one main surface (upper surface) of the arm base end part 20.
Specifically, the support plate section 60 and the presser plate section 61 are formed integrally with the arm base end section 20 and are arranged at a position adjacent to the attachment position of the piece holding section 36 (see FIG. 1).

The support plate portion 60 and the presser plate portion 61 are vertical plate-shaped portions that extend while being bent upward.
The press plate part 61 has elasticity, is thinner than the support plate part 60, and has a width smaller than the support plate part 60. Further, the upper end portion of the presser plate portion 61 can be temporarily moved in a direction away from the support plate portion 60.
That is, the holding clip 13 is a portion that can hold the X-ray image detection medium 3 by sandwiching it between the support plate section 60 and the pressing plate section 61.

Note that, as shown in FIG. 2, this holding clip 13 is formed at a position spaced apart from the guide ring 10 in the horizontal direction. That is, in the indicator 1, the guide ring 10, the piece holding part 36, and the holding clip 13 are arranged so as to be lined up in a straight line.
Therefore, when the X-ray image detection medium 3 is held by the holding clip 13, the X-ray image detection medium 3 is placed in a position facing the space surrounded by the ring portion 10a (see FIG. 1).

Next, the assembly structure of the indicator 1 of this embodiment will be explained.

As shown in FIGS. 1 and 3, the indicator 1 of this embodiment has a piece holding section 36 attached to one main surface (upper surface) of the arm base end 20, and a piece holding section 36 attached to the other main surface (lower surface) of the arm base end 20. Upper and lower tooth contact parts 37 are attached.
Specifically, as shown in FIGS. 3 and 9, the two guide protrusions 48 of the piece holding part 36 are inserted into different guide holes 26, and and the second attachment hole portion 47 of the piece holding portion 36 are overlapped.

On the other hand, as shown in FIG. 9, the mounting cylinder part 51 of the upper and lower tooth contact parts 37 is inserted into the first mounting hole part 25 and the second mounting hole part 47, and the upper part of the mounting cylinder part 51 is inserted into the second mounting hole part 25 and the second mounting hole part 47. It is placed inside the second attachment hole 47 (lower hole 47b) (see FIG. 9(a)). Then, the shaft portion 38b of the clamping portion connecting member 38 is inserted into the inner hole 51a of the mounting cylinder portion 51 to connect them, and the head portion 38a of the clamping portion connecting member 38 is inserted into the second mounting hole portion 47 (upper hole 47a). It is placed inside the .

As a result, the upper and lower tooth contact portions 37 and the piece holding portion 36 are connected via the clamping portion connecting member 38, and the clamping portion 12 is formed.
The arm base end portion 20 is located between the bottom plate portion 41 of the piece holding portion 36 and the main body portion 50 of the upper and lower tooth contact portions 37, and is sandwiched therebetween.

As shown in FIG. 10, the indicator 1 of this embodiment allows the arm portion 11 to be rotated relative to the gripping portion 12 while the person to be photographed is lightly biting the gripping portion 12 (see FIG. 2). is possible. At this time, the arm part 11 has the mounting cylinder part 51 inserted into the first mounting hole part 25 (see FIG. 9) and rotates around this axis. In other words, the arm portion 11 is rotatable about a rotation axis that extends vertically from one side of the upper and lower teeth to the other side.

Regarding this, with reference to FIG. 10, a case will be described in which the arm portion 11 and the guide ring 10 are moved mesially and distally while the person to be imaged fixes the indicator 1 by biting it lightly with his left back teeth. Note that in the following description, the posture shown in FIG. 10(a) will be explained as a reference posture.

As shown in the right view of FIG. 10(a), the reference posture is a state in which the two guide protrusions 48 are both held at the center side of the guide hole 26. That is, both of the two guide protrusions 48 are held in the third holding area 31c (see FIG. 6) of the guide hole 26. In addition, in this standard posture, the angle θ formed by the imaginary line L1 extending in a direction perpendicular to the opening surface of the ring portion 10a and the imaginary line L2 extending in the longitudinal direction of the mounting groove 43 is 90 degrees in plan view. .

When the guide ring 10 is brought closer to the mesial side (the front tooth side of the tooth row) from the standard posture, the arm portion 11 (arm base end portion 20) is rotated in the direction of the arrow shown in the right diagram of FIG. 10(b). That is, the base end portion of the connecting plate portion 21 extending from the arm base end portion 20 is moved in a direction from the outside to the inside of the tooth row. As a result, the holding position of the guide protrusion 48 is changed between the two guide holes 26, as shown in the right view of FIG. 10(a) and the right view of FIG. 10(b).

That is, by moving the arm base end 20 with respect to the guide protrusion 48 while the guide protrusion 48 remains in the same position, the guide protrusion 48 is inserted into the guide hole 26. It moves relative to the guide hole part 26 while maintaining the position.

At this time, as shown in the right figure of FIG. 10(b), in one guide hole 26 (the upper guide hole 26 in the figure), the holding position of the guide protrusion 48 is more guided than in the reference posture. The position is on the ring 10 side (left side in the right figure of FIG. 10(b)).
On the other hand, in the other guide hole 26 (lower guide hole 26 in the figure), the holding position of the guide protrusion 48 is closer to the holding clip 13 (in the right figure of FIG. 10(b)) compared to the reference posture. (right side) position.
In other words, the two guide protrusions 48 are both held at portions located closer to the ends in the extending direction of the guide hole 26 than in the reference position.

The structure is such that when the holding position of the guide protrusion 48 is changed as the arm base end portion 20 rotates, the holding positions of the two guide protrusions 48 are changed simultaneously. That is, when the holding position of one guide protrusion 48 is changed, the holding position of the other guide protrusion 48 is also changed at the same time.

Here, as described above, the guide hole portion 26 has five holding areas 31 consisting of the first holding area 31a to the fifth holding area 31e (see FIG. 6(a)). Therefore, when the holding position of the guide protrusion 48 is changed as shown in FIGS. 10(a) and 10(b), the guide protrusion 48 The holding area 31 that holds 48 is changed.

Regarding this, as shown in FIGS. 6(b) to 6(d), the guide protrusion 48 shifts from the state held in the third holding area 31c to the state held in the first holding area 31a. Let's explain the case.

In this case, the guide protrusion 48 shifts from being held in the third holding area 31c to being held in the second holding area 31b, and then to being held in the first holding area 31a. That is, the holding areas 31 that hold the guide protrusions 48 are switched one by one in the arrangement order.

Note that when the guide protrusion 48 is about to shift from the state held in the third holding area 31c to the state held in the second holding area 31b, the two second raised parts 28b prevent the relative movement of the guide protrusion 48. It functions as a regulatory department that regulates. In other words, unless a certain force or more is applied to rotate the arm base end 20 (see FIG. 10), the two second protrusions 28b come into contact with the guide protrusion 48 and are prevented from rotating. It has become. This can prevent unintended rotation of the arm portion 11 (arm base end portion 20).

On the other hand, when the arm base end portion 20 is rotated by applying a force above a certain level, the guide hole portion 26 is temporarily elastically deformed (not shown), and the two second raised portions 28b are moved away from each other. Move and restrictions will be lifted. That is, when the guide protrusion 48 moves relative to the guide hole 26, the two second protrusions 28b are temporarily pushed outward (outside in the width direction of the guide hole 26), and the guide protrusion 48 is relatively moved so as to pass between the two second protrusions 28b. The guide protrusion 48 is then fitted into the second holding area 31b. That is, the guide protrusion 48 is inserted into the second holding area 31b, and the temporarily deformed guide hole 26 returns to its original shape (not shown).

Therefore, when the guide protrusion 48 fits into the second holding area 31b, the person who rotates the arm base end 20 feels a "click" feeling. In other words, the guide protrusion 48 and the guide hole 26 are engaged at different positions depending on the relative movement of one with respect to the other, and the engagement creates a sense of moderation (gives the user a sense of moderation). It has a structure (retention structure).

Similarly, when transitioning from the second holding area 31b to the state where the first holding area 31a is held, the guide protrusion 48 relatively moves against the restriction of the two first raised portions 28a. Then, when it fits into the first holding area 31a, the user feels a "click" feeling.
Similarly, when rotating the arm base end 20 in the opposite direction, when the guide protrusion 48 relatively moves against the restriction of the two protrusions 28 and fits into the adjacent holding area 31, It gives the user a "click" feeling of moderation.

From the above, the indicator 1 of this embodiment can rotate the arm portion 11 little by little at a predetermined rotation angle (5 degrees in this embodiment).

That is, as described above, when the guide ring 10 is brought closer to the mesial side from the reference posture (see FIG. 10(a)), the arm portion 11 (arm base end portion 20) is rotated until the user feels a sense of moderation. let In this case, as shown in FIG. 11, in each of the two guide holes 26, the holding area 31 that holds the guide protrusion 48 is shifted to the adjacent holding area 31. As a result, among the angles formed by the virtual line L1 and the virtual line L2, the angle θ1 formed by the front teeth side becomes 85 degrees. That is, the arm base end portion 20 rotates at a rotation angle of 5 degrees.

From this state, when the arm section 11 is further rotated in the same direction until the user feels a sense of moderation, the guide protrusion 48 will move in each of the two guide holes 26, as shown in FIG. 10(b). The holding area 31 that holds the data transfers to one more adjacent holding area 31.
As a result, among the angles formed by the virtual line L1 and the virtual line L2, the angle θ2 formed by the front teeth side becomes 80 degrees. That is, the arm base end portion 20 further rotates by a rotation angle of 5 degrees, and is in a state where it is rotated by a rotation angle of 10 degrees from the reference posture.

In addition, when the guide ring 10 is brought closer to the distal side (molar tooth side of the tooth row) from the reference posture (see FIG. 10(a)), the arm portion 11 (arm base end 20 ). That is, in the direction of the arrow shown in the right figure of FIG. 10(c), the base end portion of the connecting plate portion 21 is moved in the direction from the inside to the outside of the tooth row.

At this time, by rotating the arm portion 11 (arm base end portion 20) from the standard posture until the user feels a sense of moderation, the holding position of the guide protrusion portion 48 is changed by the two guide holes 26, and the arm The portion 11 is now rotated at a rotation angle of 5 degrees (not shown).
Then, when the arm portion 11 is further rotated in the same direction from this state, as shown in FIG. Furthermore, a state is reached in which the holding area 31 is moved to one more adjacent holding area 31.
As a result, among the angles formed by the virtual line L1 and the virtual line L2, the angle θ3 formed by the front teeth side becomes 100 degrees. That is, the arm base end portion 20 further rotates by a rotation angle of 5 degrees, and is in a state where it is rotated by a rotation angle of 10 degrees from the reference posture.

In this way, if the arm part 11 is structured to be able to rotate little by little at a predetermined angle (5 degrees in this embodiment), the position of the guide ring 10 can be easily adjusted.
Furthermore, as described above, in this embodiment, the arm portion 11 (arm base end portion 20, connecting plate portion 21) to which the guide ring 10 is fixed and the holding clip 13 are integrally formed (see FIG. 3). . Therefore, as shown in FIG. 10, as the guide ring 10 rotates, the holding clip 13 simultaneously rotates. At this time, the guide ring 10 and the holding clip 13 rotate together while maintaining their relative positions, so even if the guide ring 10 moves, the X-ray image held by the guide ring 10 and the holding clip 13 The relative position with the detection medium 3 (see FIG. 1) is maintained. That is, even if the guide ring 10 moves, the X-ray image detection medium 3 is maintained in a state facing the space surrounded by the ring portion 10a (see FIG. 1).

Here, if the X-ray irradiation direction (the direction indicated by the arrow in the left diagram of FIG. 10) and the intersection angle of the X-ray image detection medium 3 (90 degrees in FIG. 10) are changed, the obtained image A situation may occur where the image appears distorted (for example, the teeth appear elongated).
However, in this embodiment, as described above, since the relative position of the guide ring 10, which serves as a reference for the X-ray irradiation direction, and the X-ray image detection medium 3 is maintained, the cone 17 is attached to the moved guide ring 10. Just by aligning them (see Figure 2), accurate photography with suppressed distortion becomes possible.

As shown in FIG. 12, the indicator 1 of this embodiment can be used for X-ray photography of the front teeth by biting with the upper and lower front teeth, and can be used for X-ray photography of the back teeth by biting with the upper and lower back teeth. be. In other words, there is no need to prepare indicators for back teeth and indicators for front teeth and use them separately as in the past, improving convenience for the operator during X-ray imaging.
Additionally, although not shown in the drawings, the indicator 1 of this embodiment allows for X-rays to be taken not only on the upper teeth side but also on the lower teeth side by having the subject bite in an upside-down position. It can also be used for line photography.

Here, as shown in FIG. 13, the indicator 1 of this embodiment has the upper and lower tooth abutting parts 37 on one side of the clamping part 12, and as described above, the abutting surface part 52 on which the teeth abut. The overall shape is approximately dome-shaped, and lattice grooves are formed on the surface of the contact surface portion 52.
From this, it is possible to determine whether the subject is biting the clamping portion 12 lightly with the upper and lower front teeth (see Figure 13(a)) or lightly biting with the upper and lower back teeth (see Figure 13(b)). However, the gripping portion 12 can be firmly gripped.
This will be explained in detail by taking as an example the case where the contact surface portion 52 is used facing downward.

When biting the clamping part 12 with the front teeth, as shown in FIG. 13(a), the mouth is left relatively small, so the lower jaw does not tilt significantly with respect to the upper jaw. Therefore, the gap between the upper and lower sides formed between the row of teeth that contacts the clamping part 12 from above (row of upper front teeth) and the row of teeth that contacts from below (row of lower front teeth) is The length between the top and bottom is approximately constant.
In this case, the lower tooth row comes into contact with the central portion of the contact surface portion 52 that bulges out to the outermost side (lower side in FIG. 13) and its surroundings, and the lattice groove (see FIG. 8(b)) Unintended misalignment is prevented (suppressed) by the tooth tips of the tooth rows that partially come in contact with each other.

On the other hand, when biting the clamping part 12 with the back teeth, as shown in FIG. 13(b), the lower jaw is largely tilted with respect to the upper jaw in order to open the mouth relatively widely. For this reason, the gap between the upper and lower teeth becomes smaller toward the molar side of the upper tooth row that contacts the clamping portion 12 from above and the lower tooth row that contacts the gripping portion 12 from below.
Here, the abutting surface portion 52 has a shape in which the central portion bulges outwardly (downward in FIG. 13), and the bulge decreases (thickness decreases) from the central portion to the peripheral portion. ing. Therefore, the portion of the abutting surface portion 52 from the central portion to the peripheral edge portion (the right edge portion in Fig. 13(b)) enters the gap between the upper and lower tooth rows that becomes smaller toward the molar side, and the abutting surface portion 52 can be brought into firm contact with the teeth. Further, at this time, the uneven portion formed on the surface of the crown portion of the tooth enters the lattice groove (see FIG. 8(b)) to prevent unintended positional displacement.

That is, the indicator 1 of the present embodiment allows the gripping portion 12 to take an appropriate posture when biting the gripping portion 12 with the front teeth, or when chewing the gripping portion 12 with the back teeth. Teeth can be brought into contact with a wide range of areas. In addition, unintentional misalignment can be prevented by the tips of the front teeth and the uneven parts of the surfaces of the back teeth getting into (getting caught in) the lattice grooves.

In addition, in the first embodiment described above, as shown in FIG. It may be longer than the hole depth Lβ. That is, a structure may be adopted in which the clamping portion connecting member 38 and the upper and lower tooth contact portions 37 are movable in the thickness direction of the arm base end portion 20 (vertical direction in FIG. 14).

That is, in the natural state, as shown in FIG. 14(a), the head portion 38a of the clamping portion connecting member 38 contacts the bottom portion of the upper hole 47a, and the lower surface of the arm base end portion 20 and the upper and lower teeth contact portions contact each other. A gap 70 is formed between the upper surfaces of the main body portions 50 of 37.
In this state, the person to be photographed lightly bites the clamping part 12, and in a state where the gap 70 between the arm base end part 20 and the upper and lower tooth contact parts 37 becomes slightly narrower (not shown), the arm is moved as described above. It becomes possible to rotate the base end portion 20.

On the other hand, after rotating the arm base end 20, by having the photographed person strongly bite the clamping part 12, the clamping part connecting member 38 and the upper and lower tooth contact parts 37 are connected to the piece holding part 36 and the arm base. It is moved upward relative to the end portion 20. In this state, the lower surface of the arm base end portion 20 and the upper surface of the main body portion 50 of the upper and lower tooth contact portions 37 are in surface contact over a wide range, making it difficult to rotate the arm base end portion 20 due to frictional force. can. That is, the indicator 1 of this embodiment may have a structure that restricts (blocks) the arm base end portion 20 when the person to be photographed strongly bites on it.

Next, an indicator 101 according to a second embodiment of the present invention will be described in detail with reference to the drawings. Note that the same parts as in the embodiment described above are denoted by the same reference numerals, and redundant detailed explanation will be omitted.

As shown in FIG. 15, the indicator 101 (intraoral X-ray imaging instrument) of this embodiment includes a guide ring 10, an arm portion 111, a piece holding portion 136 that constitutes a clamping portion 112, and an upper and lower tooth contact portion. 37 and a retaining clip 13.

The arm portion 111 is different from the above-described first embodiment in the structure of the arm base end portion 120. The arm base end portion 120 of this embodiment is provided with one first attachment hole portion 25 and four guide recesses 126 (guide receiving portions). The first attachment hole portion 25 has a circular opening shape and is a through hole that penetrates the arm base end portion 120 in the thickness direction.

As shown in FIG. 16, the guide recess 126 is a bottomed elongated hole-shaped depression, has an opening on one main surface (upper surface) of the arm base end 120, and has a thickness that extends the arm base end 20. It has depth in the direction. Further, the guide recess 126 is a recessed portion extending in the circumferential direction of the opening of the first attachment hole 25 .

Each guide recess 126 has three holding areas 131 (protrusion holding areas) consisting of a first holding area 131a to a third holding area 131c, and a raised part 128 (regulating part) located between the two holding areas 131. have

The holding area 131 has a rounded convex shape, and specifically, is a substantially hemispherical concave portion. Note that the term "substantially hemispherical" herein is not limited to a complete hemisphere, and includes a shape obtained by cutting out a part of a sphere with a plane, and the same applies below.

As shown in FIG. 16(b), the raised portion 128 is a portion raised from the bottom portion of the guide recess 126 toward the opening side (upper side), and a portion of the side surface forms a wall surface portion of the holding area 131.
The raised portion 128 is a relatively shallow portion of the guide recess 126, and its bottom portion is located on the opening side (upper side in FIG. 16(b)) than the deepest bottom portion of the raised portion 128.

As shown in FIG. 17, the piece holding section 136 is different in that the second mounting hole 47 (see FIG. 7) is not provided in the bottom plate section 141, and the shape, number, and formation position of the guide projections 148 are different. This is different from the piece holding section 36 described above (see FIG. 7).

As shown in FIG. 17(b), the piece holding portion 136 is one main surface (lower surface) of the bottom plate portion 141, and is opposite to the main surface (upper surface) forming the bottom portion of the mounting groove portion 43. One engaging small cylinder part 147 and four guide protrusions 148 are provided at the positions.

The engagement small cylinder portion 147 is a substantially cylindrical portion that is formed near the center of the bottom plate portion 141 in the longitudinal direction and the width direction and protrudes outward (upward in FIG. 17).
The guide protrusion 148 is a protruding portion that protrudes so that the overall shape is approximately hemispherical.
Each of the four guide protrusions 148 is provided at a position slightly away from each of the four corners of the bottom plate 141 toward the center of the bottom plate 141 (on the engagement small cylinder 147 side). That is, the four guide protrusions 148 are arranged in a matrix at intervals in the longitudinal and width directions of the bottom plate part 141.

Next, the assembly structure of the indicator 101 of this embodiment will be explained.
In the indicator 101 of this embodiment, as shown in FIG. The small cylinder portion 147 is inserted.

That is, the mounting cylinder part 51, which is the engagement part on the upper and lower tooth contact part 37 side, and the engagement small cylinder part 147, which is the engagement part on the piece holding part 136 side, are engaged with each other, and the upper and lower tooth contact part 37 and the piece holding part 136 are connected to form the holding part 112.
That is, in the first embodiment described above, the piece holding part 36 and the upper and lower tooth contact parts 37 are connected via the gripping part connecting member 38 to form the clamping part 12, but in this embodiment, the upper and lower tooth contact parts The holding portion 112 is formed by directly connecting the contact portion 37 and the piece holding portion 136.

Here, the mounting cylinder portion 51 forms a shaft portion of the holding portion 112 that extends from the upper surface of the main body portion 50 to the lower surface of the bottom plate portion 141 of the piece holding portion 136.
The length of the mounting cylinder portion 51 (distance from the upper surface of the main body portion 50 to the lower surface of the bottom plate portion 141) Lγ is longer than the thickness of the arm base end portion 120 (the length of the first mounting hole portion 25). long.
Therefore, as shown in FIG. 18, the holding part 112 is attached to the arm base end part 120 in a vertically movable manner.

At this time, as shown in FIG. 19, the lower end portion of the guide protrusion 148 of the piece holder 136 is inserted into the guide recess 126. Even if the holding part 112 is moved in the vertical direction with respect to the arm base end part 120, the guide protrusion part 148 does not come off from the guide recess part 126.

Specifically, when the holding part 112 is located at the lowest position within the movement range, as shown in FIG. A gap 170 is formed between. Then, a relatively small gap 171 is also formed between the lower surface of the bottom plate portion 141 and the upper surface of the arm base end portion 120.
Further, in this state, as shown in FIG. 19(a), the guide protrusion 148 is inserted into the holding area 131 of one of the guide recesses 126 and is in contact with the bottom part of the holding area 131. .

On the other hand, when the clamping part 112 is moved upward with respect to the arm base end part 120 and the clamping part 112 is located at the uppermost side within the movement range, the arm base The lower surface of the end portion 120 and the upper surface of the main body portion 50 are in surface contact. At this time, the gap 171 between the bottom surface of the bottom plate part 141 and the top surface of the arm base end part 120 widens greatly, and becomes a relatively wide gap 171.
In this state, as shown in FIG. 19(b), the guide protrusion 148 does not contact the bottom part of the holding area 131, but the tip part of the guide protrusion 148 is lower than the opening of the guide recess 126. Located on the lower side.

From the above, when the clamping part 112 is moved relative to the arm base end part 120, no matter where the clamping part 112 is placed within the movement range, the tip of the guide protrusion 148 is It is in a state located below the opening of the recess 126. In other words, no matter how the position of the holding part 112 relative to the arm base end part 120 changes, at least a portion of the guide protrusion 148 remains disposed inside the guide recess 126, so that the guide protrusion 148 does not come off from the guide recess 126.

The indicator 101 of this embodiment also allows the arm portion 111 to be rotated relative to the holding portion 112 while the person to be photographed is lightly biting the holding portion 112, as shown in FIG. There is. Regarding this, a case in which the arm portion 111 and the guide ring 10 are moved mesially will be described with reference to FIG. 20.

Similarly to the above, the attitude shown in FIG. 20(a) is set as the reference attitude.
That is, the reference posture is a posture in which the angle θ formed by the imaginary line L1 extending in a direction perpendicular to the opening surface of the ring portion 10a and the imaginary line L2 extending in the longitudinal direction of the mounting groove portion 43 is 90 degrees.

In the standard posture, as shown in the right view of FIG. 20(a), the four guide protrusions 148 are all located in the holding area 131 (second holding area 131b) located toward the center in the longitudinal direction of the guide recess 126. It is kept in the state.

When moving the guide ring 10 closer to the mesial side (the front tooth side of the tooth row) from the standard posture, the arm portion 111 (arm base end portion 120) is rotated in the direction of the arrow shown in the right diagram of FIG. 20(b). That is, the base end portion of the connecting plate portion 21 extending from the arm base end portion 120 is moved in a direction from the outside to the inside of the tooth row. As a result, the holding position of each guide protrusion 148 is changed, as shown in the right view of FIG. 20(a) and the right view of FIG. 20(b).

That is, by moving the arm base end 120 with respect to the guide protrusion 148 while the guide protrusion 148 remains in the same position, the guide protrusion 148 remains inserted into the guide recess 126. while moving relative to the guide recess 126.

At this time, as shown in the right figure of FIG. 20(b), in the two guide recesses 126 located on the connecting plate part 21 side (upper side of the right figure of FIG. 20(b)), the guide protrusions are The holding position of 48 is closer to the guide ring 10 (left side in the right view of FIG. 20(b)).
On the other hand, in the other two guide recesses 126 located on the opposite sides of the first mounting hole 25 (lower side of the right figure in FIG. is located closer to the holding clip 13 (on the right side of the right diagram in FIG. 20(b)).
That is, the guide protrusions 48 are each held at a portion located closer to the end in the extending direction of the guide recess 126 than in the reference position.

Note that this embodiment also has a structure in which the holding positions of the four guide protrusions 148 are changed at the same time.

Here, as described above, the guide recess 126 has three holding areas 131 consisting of the first holding area 131a to the third holding area 131c (see FIG. 16). Therefore, as shown in FIG. 20, when the holding position of the guide protrusion 148 is changed, the holding area 131 that holds the guide protrusion 148 is changed as shown in FIG. 21.

Regarding this, as shown in FIGS. 21(a) to 21(c), the guide protrusion 148 shifts from a state held in the second holding area 131b to a state held in the first holding area 131a. A case in which this is done will be explained in detail.

When trying to rotate the arm base end 120 (trying to move it in the direction of the arrow in FIGS. 21(a) and 21(b)), the side surface portion of the raised portion 128 presses against the guide protrusion 148. It will be in a state where it is
Here, the raised portion 128 functions as a restriction portion that restricts relative movement of the guide protrusion 148. That is, unless an attempt is made to rotate the arm base end 120 by applying a force above a certain level, the guide protrusion 148 is caught on the protrusion 128, thereby preventing the arm base end 120 from moving. In other words, relative movement of the guide protrusion 148 with respect to the arm base end 120 is prevented.

On the other hand, if a force above a certain level is applied to rotate the arm base end 120, the arm base end 120 rotates and moves downward (not shown).

That is, as shown in FIG. 20, the outer surface of the guide protrusion 148 is a substantially hemispherical convex curved surface, and the side surface of the protrusion 128 is a concave curved surface shaped to follow the outer surface of the guide protrusion 148. ing. As described above, the holding part 112 (piece holding part 136) in which the guide protrusion 148 is formed is movable in the vertical direction relative to the arm base end part 120 (FIG. 19). etc.).
For these reasons, if a certain amount of force is applied to the arm base end 120 in the rotational direction while these curved surfaces are in contact with each other, the second holding area 131b of the arm base end 120 will move outside the guide protrusion 148. It slides downward along the surface (not shown). As a result, the upper end portion of the raised portion 128 transitions to a state in which it contacts the lower end portion of the guide protrusion 148 (see FIG. 21(b)).

Then, by rotating the arm base end 120 as it is, the first holding area 131a is positioned below the guide protrusion 148, and the guide protrusion 148 is inserted into the first holding area 131a. Transition.
That is, the guide protrusion 148 moves relative to the arm base end 120 as if moving over the protrusion 128. This causes the guide protrusion 148 to transition from a state held in the second holding area 131b to a state held in the first holding area 131a.

That is, as described above, the raised portion 128 functions as a regulating portion that restricts the relative movement of the guide protrusion 148, and also controls the direction of movement of the arm base end portion 120 (the direction of relative movement of the guide protrusion 148). It also functions as a moving direction changing section.

From the above, the indicator 101 of this embodiment can also rotate the arm portion 111 little by little at a predetermined rotation angle (15 degrees in this embodiment).
That is, as described above, when the guide ring 10 is brought closer to the mesial side from the standard posture, the holding area 131 that holds the guide protrusion 148 is moved to the next adjacent holding area 131. As a result, as shown in FIG. 20(b), among the angles formed by the virtual line L1 and the virtual line L2, the angle θ4 formed by the front teeth side becomes 75 degrees. That is, the arm base end portion 120 rotates at a rotation angle of 15 degrees.
In addition, when rotating the arm part 111 to the centrifugal side, the arm part 111 is rotated in the opposite direction to the above (detailed explanation is omitted).

By the way, as described above, when the holding part 112 is located at the uppermost position within the movement range, the tip part of the guide projection part 148 is connected to the bottom part of the holding area 131, as shown in FIG. 19(b). They are not in contact with each other and are positioned below the opening of the guide recess 126.
That is, as shown in FIG. 19(b), when the guide protrusion 148 is moved vertically upward from the state where it is held in the holding area 131, the distal end portion of the guide protrusion 148 becomes part of the holding area 131. It is in a state of being stuck.
In this state, it is preferable that the tip portion of the guide protrusion 148 is located below the upper end of the raised portion 128 (see FIG. 21, etc.).

That is, as shown in FIG. 21, when the guide protrusion 148 moves relative to the protrusion 128, the protrusion 128 is temporarily elastically deformed so as to be slightly depressed downward, and the guide protrusion 148 It may also have a structure in which it rides on the raised portion 128. In this structure, when the guide protrusion 148 moves relative to the upper side of the next adjacent holding area 131, the protrusion 128 returns to its original shape. Such a structure is preferable because the user feels a stronger sense of moderation as the holding area 131 shifts.

In each of the embodiments described above, the guide protrusions 48, 148 are provided on the clamping parts 12, 112, and the guide holes 26 and guide recesses 126 that engage with these guide protrusions 48, 148 are provided on the arm parts 11, 111. An example was shown. However, the present invention is not limited to this, and the protruding portion may be provided on the arm side and the receiving portion may be provided on the holding portion side. That is, one and the other of the engaging parts that engage with each other are provided on the arm side and the holding part side, respectively, and the engaging parts rotate the arm part by a predetermined angle, thereby preventing unexpected rotation of the arm part. I wish I could.

Next, an indicator 401 (intraoral X-ray imaging instrument) according to a third embodiment of the present invention will be described in detail with reference to the drawings. Note that the same parts as in the embodiment described above are denoted by the same reference numerals, and redundant detailed explanation will be omitted. Furthermore, in the following description, unless otherwise specified, the guide ring 410 side will be referred to as the front side, and the opposite side will be referred to as the rear side. Further, the vertical direction will be explained based on the state shown in FIG. 22.

As shown in FIGS. 22 and 23, the indicator 401 of this embodiment includes a guide ring 410 (reference part), an arm part 411, a holding part 412, and a holding clip 413 (holding part). . This indicator 401 is used by attaching the occlusal piece 2 and the X-ray image detection medium 3 (in FIGS. 22 and 23, the occlusal piece 2 and the (Shows the state in which media 3 is not installed).

In the indicator 401 of this embodiment, an arm portion 411, a holding portion 412, and a holding clip 413 are integrally formed to form an indicator body portion 414. That is, the indicator 401 has an indicator main body 414 and a guide ring 410 that is detachably attached to the indicator main body 414, and is formed by attaching the guide ring 410 to the indicator main body 414. The indicator main body 414 and the guide ring 410 are both members made of synthetic resin.

The arm portion 411 has an arm main body portion 411a and a ring attachment portion 411b (arm side engagement portion), which are integrally formed. The arm main body portion 411a is a flat plate-shaped portion, and similarly to the above-described connecting plate portion 21 (see FIG. 1), the arm body portion 411a is a portion that extends while being bent in a substantially V-shape when viewed from above. In other words, when viewed from above, a portion extending from the side to the outside (one side in the left-right direction) of the holding portion 412 (center plate-like portion 435), a bent portion 415 that is a folded portion, and a portion extending in the left-right direction toward the front. It has a portion extending toward the other side. That is, the bent portion 415 is a portion located between a portion extending to one side in the left-right direction and a portion extending to the other side, which is the opposite side.

As shown in FIGS. 24 and 25, the ring attachment portion 411b is a portion that is provided on the distal end side in the extending direction of the arm body portion 411a and extends obliquely upward (frontward and upward). The ring attaching portion 411b is a substantially rectangular flat protruding portion, and has a shorter length in the width direction than the arm main body portion 411a (see FIG. 25).

As shown in FIGS. 22 and 23, the holding part 412 includes a flat central plate part 435, a piece holding part 436 formed on the upper side of the central plate part 435, and a lower part of the central plate part 435. It has upper and lower tooth contact parts 437 (contact parts) formed on the sides. That is, the piece holding portion 436 and the upper and lower tooth contact portions 437 are respectively formed at positions on both sides of the central plate-like portion 435 in the vertical direction. The piece holding portion 436 and the upper and lower tooth contact portions 437 are portions that are located between a person's upper and lower teeth during use. In other words, the occlusal piece 2 (see FIG. 1) held by the piece holding part 436 and the upper and lower tooth contact parts 437 are parts where one of the upper teeth and the lower tooth comes into contact with the other.

The piece holding portion 436 is an extending portion having a substantially U-shaped cross section. That is, as shown in FIG. 24, it has a flat bottom plate portion 436a and two side wall portions 436b that protrude upward from respective positions spaced apart in the width direction of the bottom plate portion. In this embodiment, one side wall portion 436b of the piece holding portion 436 and the pressing plate portion 461 of the holding clip 413 are integrally formed (details will be described later).

As shown in FIGS. 23 and 26, the upper and lower teeth abutting portions 437 include a flat proximal plate portion 451 and a contact portion located below (in FIG. 26, upper side) the proximal plate portion 451. This is a portion where the surface forming portion 452 is integrally formed. As shown in FIG. 26, the upper and lower tooth contact portions 437 have a generally dome-shaped overall shape, and in detail, the upper and lower tooth contact portions 437 are dome-shaped so that the shape in plan view is approximately a rectangular shape with rounded corners (oval shape). It has a shape with a part missing.

The overall shape of the contact surface forming portion 452 is a rounded and convex shape that protrudes (bulges) toward the outside (downward, in FIG. 26, upward). More specifically, the protrusion length becomes longer from the peripheral portion to the central portion (the central portion bulges out more than the peripheral portion).

Here, the contact surface forming portion 452 includes a plurality of first grooves 55 (groove portions) extending in a predetermined direction and a plurality of second grooves 56 (grooves) extending in a direction intersecting (orthogonal to) the first grooves 55. part) is formed. Similar to the embodiment described above, the plurality of first grooves 55 and the plurality of second grooves 56 are respectively arranged in parallel to form a series of grooves (lattice grooves).

In other words, the abutting surface forming portion 452 is a portion formed by dividing a dome-shaped portion into a plurality of protruding portions 58 by a plurality of groove portions (first groove 55, second groove 56). I can say it. In other words, the contact surface forming portion 452 is constituted by a plurality of protrusions 58 arranged in a matrix.

Therefore, the outer portion (lower end portion, upper end portion in FIG. 26) of the contact surface forming portion 452 has an uneven shape. In other words, the outer surface (the outer end surface) of the contact surface forming portion 452 is an uneven surface. Further, as shown in FIG. 26(b), the shape of the contact surface forming portion 452 in side view (the shape in plan view with the extending direction of the first groove 55 as the viewing direction) is such that the protrusion of the contact surface forming portion 452 is The end surface has a curved shape with a mountain shape interrupted by grooves. The front view shape of the abutment surface forming portion 452 (plan view shape with the extending direction of the second groove 56 as the line of sight direction) is also a shape in which the surface on the protruding end side is a curved surface with a mountain shape interrupted by the groove portion. It becomes.
In other words, the planar shape of the abutting surface forming portion 452 viewed from the side (for example, from all directions) has a curved surface in the shape of an interrupted mountain on the protruding end side, regardless of the shape viewed from any direction.

The holding clip 413 is a part that holds the X-ray image detection medium 3 on both sides, and has a support plate part 460 and a pressing plate part 461, as shown in FIGS. 22 and 24.
The support plate portion 460 is formed at a position slightly laterally away from the piece holding portion 436, extends obliquely upward from the upper surface of the central plate-like portion 435, and has a partially bent portion.
The holding plate portion 461 is a portion formed including one side wall portion 436b of the piece holding portion 436. In other words, it is constituted by the side wall portion 436b and a portion extending further upward from the upper portion of the side wall portion 436b.

As shown in FIG. 27, the guide ring 410 is a continuous annular member, and like the guide ring 10 described above, it is placed outside the mouth of the person to be photographed, and is used when adjusting the placement position of the cone 17. This is the standard part.
The guide ring 410 of this embodiment is a member in which a ring main body portion 410a and a plurality of ring side engaging portions 470 (reference portion side engaging portions) are integrally formed. Specifically, the guide ring 410 has three ring-side engaging parts 470 consisting of a first ring-side engaging part 470a, a second ring-side engaging part 470b, and a third ring-side engaging part 470c.

The ring main body portion 410a is a portion that extends in the circumferential direction of the guide ring 410. That is, the ring main body portion 410a has a plurality of arcuate extending portions, and each of the arcuate extending portions extends between two different ring-side engaging portions 470.

The first ring-side engaging portion 470a, the second ring-side engaging portion 470b, and the third ring-side engaging portion 470c have a first mounting hole 475, a second mounting hole 476, and a third mounting hole 477, respectively. have. The first mounting hole 475, the second mounting hole 476, and the third mounting hole 477 are all holes into which the ring mounting portion 411b (see FIG. 24, etc.) can be fitted (engaged) almost exactly. It is.

That is, as shown in FIG. 28, one of the plurality of ring-side engaging parts 470 of the guide ring 410 is selected, and the selected ring-side engaging part 470 is engaged with the ring attachment part 411b of the arm part 411. This attaches the guide ring 410 to the indicator body 414.
As a result, the indicator 401 of this embodiment can change the orientation of the guide ring 410 to the reference orientation (see FIG. 28(a)), mesial orientation (see FIG. 28(b)), and distal orientation (see FIG. 28(c)). ) can be selected from multiple postures. This will be explained in detail below.

As shown in FIG. 27, the guide ring 410 is symmetrical in an upright position with the first ring-side engaging portion 470a positioned on the lower end side.
That is, the second ring-side engaging portion 470b is provided at a position separated from the first ring-side engaging portion 470a by a predetermined angle θ5 on one side of the guide ring 410 in the circumferential direction. Further, a third ring-side engaging portion 470c is provided at a position separated from the first ring-side engaging portion 470a by a predetermined angle θ5 on the opposite side of the guide ring 410 in the circumferential direction.
Note that the predetermined angle θ5 is an angle greater than 0 degrees and less than or equal to 90 degrees, and is 60 degrees in this embodiment.

As shown in FIG. 27, the first ring-side engaging portion 470a is a substantially short rectangular cylindrical portion having the first attachment hole 475 as an inner hole. The first attachment hole 475 is an extending hole having a substantially rectangular cross-sectional shape. This first attachment hole 475 extends in a direction perpendicular to the opening surface 480 of the guide ring 410. That is, as shown in FIG. 27(b), the angle formed by the imaginary line L3 extending in the extending direction of the first mounting hole 475 and a surface that is flush with the opening surface 480 of the guide ring 410 is 90 degrees. .

The second ring-side engaging portion 470b and the third ring-side engaging portion 470c are substantially short cylindrical portions whose inner holes are the second attachment hole 476 and the third attachment hole 477, respectively. The second attachment hole 476 and the third attachment hole 477 are holes that extend in a different direction from the first attachment hole 475, and extend in a direction intersecting the opening surface 480 of the guide ring 410. Specifically, as shown in FIG. 27(b), a virtual line L4 extending in the extending direction of the second mounting hole 476 and the third mounting hole 477 is flush with the opening surface 480 of the guide ring 410. The angle θ6 formed with the plane becomes an acute angle.

Here, as shown in FIG. 29(a), the guide ring 410 is stood upright, the first ring-side engaging portion 470a is disposed on the lower side, and the cross-sectional shape of the first attachment hole 475 is a horizontally long rectangle. The posture is as follows. In this posture, the first ring-side engaging portion 470a has both end sides in the left-right direction continuous with the ring main body portion 410a. That is, as shown in the right figure of FIG. 29(a), when the first ring-side engaging portion 470a in this posture is viewed from above, the extending direction of the first attachment hole 475 (vertical direction in the right figure), The extending directions of the ring main body portion 410a (the X direction in the right figure) are orthogonal to each other.

On the other hand, as shown in FIG. 29(b), the guide ring 410 is placed upright, the second ring-side engaging portion 470b is disposed on the lower side, and the cross-sectional shape of the second attachment hole 476 is an oblong rectangle. Take a posture that makes it look like this. In this posture, the second ring-side engaging portion 470b is on one side in the left-right direction (this side in the left view of FIG. 29(b)) and the portion from the upper front side is continuous with the ring main body portion 410a. .
That is, as shown in the right figure of FIG. 29(b), when the second ring side engaging portion 470b in this posture is viewed from above, the extending direction of the ring main body 410a (the X direction in the right figure) is the second ring side engaging portion 470b. It is inclined with respect to the extension direction (vertical direction in the right figure) and width direction (horizontal direction in the right figure) of the attachment hole 476. Specifically, in the same plan view, the ring main body portion 410a extends from one side in the left-right direction (the left side in the right figure) to the other side and toward the front side (lower side in the right figure).

Further, as shown in FIG. 29(c), the third ring-side engaging portion 470c is disposed on the lower side, and the cross-sectional shape of the third attachment hole 477 is in a horizontally long rectangular shape. In this posture, the third ring-side engaging portion 470c has a portion on the other side in the left-right direction (the back side of the left diagram in FIG. 29(c)) and is continuous with the ring main body portion 410a. .
That is, as shown in the right figure of FIG. 29(c), when the third ring side engaging portion 470c in this posture is viewed from above, the extending direction of the ring main body portion 410a (the X direction in the right figure) is It is inclined with respect to the extension direction (vertical direction in the right figure) and the width direction (horizontal direction in the right figure) of the attachment hole 477. Specifically, in the same plan view, the ring main body portion 410a extends from one side in the left-right direction (the left side in the right figure) to the other side toward the rear side (upper side in the right figure).

From the above, as described above, by changing the ring-side engaging portion 470 that engages with the ring attachment portion 411b, the attitude of the guide ring 410 can be changed (see FIG. 28).

When the ring attachment portion 411b is engaged with the first ring-side engaging portion 470a (see FIG. 29(a)), the guide ring 410 assumes the standard posture (see FIG. 28(a)).
When the guide ring 410 is set in the standard position and the X-ray image detection medium 3 (see FIG. 1) is held by the holding clip 413, the inner space of the guide ring 410 and the X-ray image detection medium 3 are arranged in a position facing each other from the front. Ru. Note that the inner space of the guide ring 410 is a space surrounded by an annularly continuous ring main body portion 410a and a plurality of ring-side engaging portions 470.

On the other hand, when the ring attachment portion 411b is engaged with the second ring-side engaging portion 470b (see FIG. 29(b)), the guide ring 410 assumes the mesial side posture (see FIG. 28(b)).
When the guide ring 410 is changed from the other posture to the mesial posture (see FIG. 28(b)), the orientation of the guide ring 410 with respect to the holding clip 413 is changed. In the mesial posture, the annularly continuous portion of the guide ring 410 is shifted toward the mesial side compared to the reference posture. In other words, the center position of the inner space of the guide ring 410 is shifted in a direction closer to the bending portion 415 and closer to the holding clip 413 in a plan view.

Moreover, when the ring attachment part 411b is engaged with the third ring side engaging part 470c (see FIG. 29(c)), the guide ring 410 assumes the distal side attitude (see FIG. 28(c)).
When the guide ring 410 is changed from the other attitude to the distal attitude (see FIG. 28(c)), the orientation of the guide ring 410 with respect to the holding clip 413 is changed. In the distal position, the annularly continuous portion of the guide ring 410 is shifted toward the distal side compared to the reference position. That is, the position is shifted in the opposite direction from the reference position to the mesial position. Specifically, in plan view of the guide ring 410, the center position of the inner space is shifted away from the bent portion 415 and closer to the holding clip 413.

In the indicator 401 of this embodiment, the position of the guide ring 410 can also be adjusted while the patient (person to be imaged) is biting the clamping part 412. The direction of X-ray irradiation can be finely adjusted. Here, the portion where the guide ring 410 is located is a portion located outside the mouth during use. Therefore, according to the structure of the indicator 401 of this embodiment, the position of the guide ring 410 can be adjusted without moving the part placed inside the mouth.

Note that the indicator 401 of this embodiment is intended to be used in a photographing method called the so-called bisection method. Therefore, as shown in FIG. 24, in a state where the thickness direction of the arm portion 411 is in the vertical direction, the inclination angle θ7 with respect to the vertical line (normal to the horizontal plane) of the extending direction of the support plate portion 460 is 25. It has become a degree. This inclination angle θ7 is also an angle formed between an imaginary line extending in the extending direction of the support plate portion 460 and a vertical line. Therefore, when the X-ray image detection medium 3 is attached, the inclination angle θ7 of the X-ray image detection medium 3 with respect to the vertical line is 25 degrees.
When the guide ring 410 is attached to the indicator body 414 in the same posture (the posture in which the thickness direction of the arm portion 411 is in the vertical direction), the inclination angle θ8 of the guide ring 410 from the upright posture is 12. It is 5 degrees. This inclination angle θ8 is also the angle formed by the virtual line extending in the extending direction of the ring main body portion 410a and the above-mentioned perpendicular line when the guide ring 410 is viewed from the side.
Further, the indicator 401 of this embodiment is not limited to this, and may be one that is assumed to be used in a photographing method called a so-called parallel method. That is, the above-mentioned inclination angle θ7 and inclination angle θ8 may both be 25 degrees.

1,101,401 Indicator (intraoral X-ray photography equipment)
3 X-ray image detection medium (X-ray detection medium)
10,410 Guide ring (reference part)
11,111,411 Arm part 12,112,412 Clamping part 13,413 Holding clip (holding part)
26 Guide hole (guide receiving part)
28,128 Raised part (regulating part)
31,131 Holding area (protrusion holding area)
36,136 Piece holding part 37,437 Upper and lower teeth contact part (contact part)
48,148 Guide protrusion 55 First groove (groove portion)
56 Second groove (groove part)
126 Guide recess (guide receiving part)
411b Ring attachment part (arm side engagement part)
470 Ring side engaging part (reference part side engaging part)

Claims (5)

A holding part that can be held between upper and lower teeth, a reference part that serves as a reference for determining the direction of irradiation of X-rays, an arm part that extends between the holding part and the reference part, and a holder that holds an X-ray detection medium. An intraoral X-ray imaging instrument that is used with the reference section placed outside the mouth,
The reference part has a plurality of reference part side engaging parts,
The arm portion has an arm-side engaging portion,
The reference part is attached to the arm part by engaging the arm side engaging part with one of the reference part side engaging parts selected from the plurality of reference part side engaging parts,
By changing the reference part side engaging part to be engaged with the arm side engaging part, the orientation of the reference part with respect to the holding part can be changed ,
The plurality of reference part side engaging parts are a first ring side engaging part, a second ring side engaging part, and a third ring side engaging part,
By engaging the arm-side engaging portion and the first ring-side engaging portion, the reference portion assumes a reference posture;
By engaging the arm-side engaging portion and the second ring-side engaging portion, the reference portion assumes a mesial side posture;
By engaging the arm-side engaging portion and the third ring-side engaging portion, the reference portion assumes a distal side posture;
An intraoral X-ray imaging instrument characterized in that when the reference position is changed to the distal position, the reference part is shifted in a direction opposite to that when the standard position is changed to the mesial position. The reference portion is continuous in an annular shape,
The second ring-side engaging part is provided at a position separated from the first ring-side engaging part by a predetermined angle on one side of the reference part in the circumferential direction, and A third ring-side engaging portion is provided at a position separated by the predetermined angle on the opposite side of the circumferential direction of the third ring-side engaging portion,
The first ring-side engaging portion, the second ring-side engaging portion, and the third ring-side engaging portion have different extending directions of portions that engage with the arm-side engaging portion,
The first ring-side engaging portion is configured such that an angle formed by an imaginary line extending in the extending direction of the portion that engages with the arm-side engaging portion and a surface that is flush with the opening surface of the reference portion is 90 degrees. formed in
The second ring-side engaging portion and the third ring-side engaging portion have surfaces that are flush with an imaginary line extending in the extending direction of the portion that engages with the arm-side engaging portion and the opening surface of the reference portion. The intraoral X-ray imaging instrument according to claim 1, wherein the angle formed by the. The clamping part has a contact part with which the teeth contact from the outside while being clamped between the upper and lower teeth,
A plurality of groove portions including a first groove extending in a predetermined direction and a second groove extending in a direction intersecting the first groove are formed in the abutting portion, and an outer portion of the abutting portion The intraoral X-ray imaging instrument according to claim 1 or 2, characterized in that it has an uneven shape due to the groove portion. The intraoral X-ray imaging instrument according to claim 3 , wherein the plurality of first grooves and the plurality of second grooves form a series of grid-like grooves. The holding part has a piece holding part that holds the occlusal piece on the opposite side of the contact part in the vertical direction during use,
The abutment portion protrudes outward in a convex manner, has a mountain-like curved surface interrupted by the groove portion on the protruding end side, and has a short protruding length from the center portion to the edge portion. The intraoral X-ray imaging instrument according to claim 3 or 4, characterized in that the intraoral X-ray imaging device gradually increases .

Images