JPH05317307A - Buccal cavity x ray standard photographing apparatus - Google Patents

Abstract

PURPOSE:To obtain an apparatus which can take a X-ray photo, with the X-ray radiation angle and radiation distance kept constant in an X-ray photographing at the time of dental diagnosis and treatment. CONSTITUTION:A buccal cavity outside parallel plate 6 is fitted to an inner buccal cavity film fixing device 3 through a U-shaped arm 5 outside the buccal cavity. An arm 5 part is formed by plural arms capable of freely sliding and rotating to enable the adjustment of a buccal cavity outside parallel plate fitting angle and distance. A scale serving for angle and distance adjustment is applied between the arm parts. The position of an X-ray photographing apparatus main body 1 is determined, sighting the buccal cavity outside parallel plate 6. Plural spot visible light rays are applied to the concentric circle drawn on the surface of the buccal cavity outside parallel plate by an optical fiber cable 9 and the position of the X-ray photographing apparatus main body is adjusted in such a manner that all visible light rays are gathered on the same circumference, whereby the center line of X-ray radiation is vertical to the buccal cavity outside parallel plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oral X-ray which allows X-ray irradiation angle and irradiation distance, particularly irradiation angle, to be kept at a desired constant in X-ray imaging during dental treatment. The present invention relates to a standard photographing device.

[0002]

2. Description of the Related Art Conventionally, in dental practice, when X-raying a desired tooth and a tissue around the tooth, an X-ray film (dental film) is placed behind (in the oral cavity of) the site of the patient. Irradiate X-rays with the X-ray imaging device on the side,
Take a picture to get a film image. In this case, the X-ray film is made to be held by the patient with his / her fingertip, while the orientation of the cone portion of the X-ray imaging apparatus (X-ray irradiation direction) is determined, and the positioning with respect to the patient is adjusted. The setting operation of the device is performed by the operator.

FIG. 10 schematically shows a method called a halving method as an imaging method for an X-ray irradiation angle in the above-described oral X-ray imaging. As shown in the figure, the X-ray film f can be positioned substantially parallel to the tooth and its surrounding tissue as shown by the solid line in the back, depending on individual differences even if the imaged region is on the posterior side or the same region. However, there is a case where it is inclined as shown by the broken line (the lower jaw side is symmetrical in the case of the figure), but this bisection method uses the X-ray film f in the oral cavity as a plane Ff.
And the bisector F2 with respect to the longitudinal center vertical plane F1 of the tooth and its surrounding tissue (tooth support tissue) is used as a reference for imaging regardless of the inclination of the X-ray film f. X-ray irradiation (irradiation center line) as indicated by a in the figure
Is perpendicular to its assumed reference plane (F2),
This is a method of setting the direction of irradiation.

As shown by b in FIG.
If the X-ray irradiation center is perpendicular to F1, the image can be taken with the target tooth and surrounding tissue always facing, but the image on the film surface obtained in this case is X-ray. As the line film f is greatly inclined, the lower image portion has a larger expansion (for example, when the specific portion point P is focused, this is reflected on the film surface Pb as illustrated). On the other hand, the film surface Ff
If the X-ray film f is photographed as shown by C in such a manner that the X-ray film f is always perpendicular to this, the obtained film image basically tends to be reduced (point P). Is reflected on the film surface Pc). In this way, considering the case where the X-ray film f is placed in the oral cavity with an inclination, the direction of X-ray irradiation is important, but in the bisection method, theoretically, there is always an intermediate value between them. It becomes a film image (for example, point P appears on Pa on the film surface). That is, even in the case where the X-ray film f has a large inclination, there is no extreme elongation or contraction, and this tendency is not biased to any tendency. This is a feature of the method (note that even in the case of this bisector method, as for the part where the X-ray film f can be positioned in the parallel or substantially parallel state, the bisector plane F2 is substantially the actual one. Film surface Ff, long axis center vertical surface F1
As a result, the same film image as that photographed in the facing state is obtained as shown in FIG.

[0005]

Therefore, in X-ray photography at the time of dental treatment, the size of a specific portion in the previous film image is re-photographed by re-photographing the same place taken in the past for the same person. In the case of X-ray photography in which the changes in the number of teeth and the like are to be compared for comparison and to be used for diagnosis, this bisection method is used to measure the intraoral X-ray film and the long-axis center vertical of the teeth and surrounding tissues. It is said that it is preferable to photograph in a state where the irradiation center line of X-rays is perpendicular to the bisector of the plane, and therefore, it is generally required to photograph in such a state. However, since it is extremely troublesome to grasp the bisector surface in the oral cavity, in most cases, conventionally, the position to be photographed is visually positioned. In particular, in the field of photography, the bisector surface in the oral cavity is exactly assumed, and the bisector method is used as a reference based on that.
Determining the irradiation direction as in item a) is time-consuming, laborious, and extremely troublesome. However, in the case of imaging by positioning by eye measurement, conventionally, it relies exclusively on the skill of the operator, and in determining the position of the X-ray imaging apparatus for each patient in the field of the imaging, it is a special case. Since no means is used as a guide, there is a problem that it is difficult to accurately obtain a film image with high accuracy by this method even if it is intended to shoot according to the bisector method. Further, in particular, when photographing the same part of the same person at different times, it is extremely difficult to reproduce the same conditions as the X-ray irradiation angle and irradiation distance, which are the same as in the previous photographing, by positioning by visual measurement. There is also a problem that the position is different each time.

The object of the present invention is to solve the above-mentioned problems and to easily control the X-ray irradiation angle and irradiation distance in X-ray photography at the time of dental treatment, particularly the expansion and contraction of the obtained film image. It is an object of the present invention to provide an oral X-ray standard photographing apparatus capable of photographing while keeping the irradiation direction always constant.

[0007]

An oral X-ray standard photographing apparatus of the present invention is a device for X-ray photographing a tooth and a tissue around the tooth by X-ray irradiation, and a film fixing for holding a dental film in the oral cavity. The device is provided on the tooth-shaped cover, and a plate is attached so as to be displaceable outside the oral cavity by connecting with the film fixing device, and the external plate is irradiated with the X-ray irradiation direction from the X-ray imaging apparatus main body. It is characterized in that it is configured as a guide for setting the distance.

[0008]

According to the oral X-ray standard radiographing apparatus of the present invention, in the X-ray photography at the time of dental treatment, the outer oral plate located outside the oral cavity of the patient is connected to the film fixing device in the oral cavity as a guide plate. Since the position of the X-ray imaging apparatus main body can be determined by aiming the outer plate of the oral cavity, it is easy to keep the X-ray irradiation angle and irradiation distance constant even when the same part is imaged again. As a result, it is possible to obtain an image with higher accuracy compared to the case where the positioning is performed by visual measurement.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. First, the overall configuration of the apparatus will be described. In the figure, 1 is the main body of the X-ray imaging apparatus,
Reference numeral 2 denotes an X-ray imaging apparatus cone portion, and the X-ray imaging apparatus main body 1
By irradiating X-rays from the X-ray generator 21 in the inside to a predetermined imaging region of the patient via the cone portion 2, X-ray imaging at the time of dental treatment is performed. At the time of this photographing, a photographing auxiliary device is used. This auxiliary device includes a tooth profile cover 50 (a lower jaw cover in the figure) for the patient, which is created in advance for the upper jaw teeth and lower jaw teeth of the patient to be imaged, and the tooth and the surrounding tissue to be imaged. From the intraoral film fixing device 3, which is placed in the oral cavity attached to the corresponding position on the tooth profile cover 50 at a position corresponding to the part, the U-shaped arm attachment 4, the U-shaped arm 5, and the parallel plate 6 outside the oral cavity Become. The tooth profile cover 50 is made of plastic and does not require the accuracy required in the case of dentures.For example, the tooth profile cover 50 may have a structure such that it can be stably attached to the patient's tooth from the upper side like a mouthpiece. Good. This tooth profile cover 50
The intraoral film fixing device 3 is integrally fixed with an adhesive agent, which is prepared as an auxiliary tool for each individual patient. On the other hand, the U-shaped arm attachment 4, the U-shaped arm, and the extraoral parallel plate 6 are common auxiliary tools that can be assembled and used with the above-mentioned auxiliary tools.

The intraoral film fixing device 3 is used to fix the X-ray film f, and at the rear end portion of the fixing device 3,
Flat bag-shaped film container 7 containing an X-ray film
It has a holder 31 for inserting and holding (for example, a size of about 2 cm × 3 cm). At the time of use, the X-ray film f is positioned behind the photographing site (inside the oral cavity) by the holder 31 such that its tilted state is regulated by inserting the film container 7. The U-shaped arm attachment 4 of the common auxiliary tool is attached to the front end portion of the intraoral film fixing device 3. Therefore, when used, the extraoral parallel plate 6 is connected to the film fixing device 3 via the attachment 4 and the U-shaped arm 5 as shown in the figure. Further, in the figure, a light source device 8 is provided on the side of the photographing device main body 1, a plurality of optical fiber cables 9 are led out from the light source device 8, and the ends thereof are brought to the periphery of the cone portion 2 and predetermined around the cone portion. Each tip fixing part arranged so as to be located on the circle
22 (only one is shown in FIG. 1).

Details of the tooth profile cover 50, the intraoral film fixing device 3, the U-shaped arm attachment 4 and the U-shaped arm 5, the external parallel plate 6, and the attached state of the optical fiber cable 9 are shown in FIG. As shown in the following, "the method of attaching the parallel plate outside the oral cavity",
"Intraoral film fixing device", "U-shaped arm structure",
"Structure of extra-oral parallel plate", "Irradiation of visible light by optical fiber cable", "How to determine shooting position", and "Understanding magnification of film image"
Others will be described with reference to FIG.

The present apparatus, in a state where the tooth profile cover 50 is removed from the tooth, is a bisector surface of the X-ray film surface Ff and the longitudinal center vertical surface F1 of the tooth and the surrounding tissue as described in FIG.
The parallel plate 6 is set to the intraoral film fixing device 3 so that it is completely parallel to F2, and the tooth profile cover is fitted to the teeth during the actual photographing so that the parallel plate 6 is perpendicular to the extraoral parallel plate 6. The position of the X-ray imaging apparatus main body 1 is determined so that X-rays are incident. As shown in FIGS. 1 and 2 and FIG. 3 which shows the U-shaped arm 5 and other parts in an enlarged manner, the U-shaped arm attachment 4 is inserted into the intraoral film fixing device 3 provided integrally on the tooth profile cover 50. An extraoral parallel plate 6 is attached to the other end of the arm 5 which is connected to one end of the arm 5 and is guided to the outside of the oral cavity. To let Therefore, in the past, even when an image is to be obtained according to the bisection method, there is no guideline for positioning outside the patient's oral cavity. By providing the plate 6, this can be used as a guide for positioning. That is, this extra-oral parallel plate 6 makes the irradiation direction of X-rays a constant angle with respect to the dental film f fixed in the oral cavity of the patient via the tooth profile cover 50 and the film fixing device 3, and the distance is almost the same. It is the outer plate of the oral cavity that serves as a guide for making decisions so as to be constant. It should be noted that this extraoral parallel plate 6 which is a part of the common auxiliary tool can be kept parallel to the bisector surface even if the bisector surface F2 (FIGS. 10 and 6) changes depending on the imaging site or the like. As described above, it is preferable that the mounting angle can be adjusted as described later.

Tooth profile 50 as an aid for individual patients
1 and the intraoral film fixing device 3 and the U-shaped arm attachment 4 (arm attachment attachment).
As shown in FIG. 2 and FIG. 3, two pins 41, 41 are provided on the side of the attachment 4 and, on the other hand, as shown in FIG. Two
One pin insertion hole 33, 33 is formed, and these can be attached and detached.

FIG. 4 shows the external appearance of the entire individual patient assisting tool including the tooth profile cover 50 and the intraoral film fixing device 3. Note that, although FIG. 4 also shows a state in which the mounting position of the film fixing device 3 on the tooth profile cover 50 is different from that of FIG. 1, the film fixing device 3 is different from the patient's imaging target as in this example. It is to be fixed to the corresponding tooth profile cover 50 in a corresponding position corresponding to the tooth and the surrounding tissue. Therefore, when there are a plurality of parts to be imaged, a plurality of film fixing devices 3 (for example, about 2 to 5 parts) can be attached to one tooth profile cover 50. Also, as the above-mentioned intraoral film fixing device 3 itself to be attached and fixed to the tooth profile cover 50 created in advance according to the patient, those of which the angle α of the rear film holder 31 as shown in FIG. 2 is different are prepared. If so, the position to be attached (hence, the site to be imaged)
A desired holder angle can be fixed to the tooth profile cover 50 according to the difference in angle angle due to individual differences among patients. Regarding the angle α, for example, for α = 5 ° (as shown in FIG. 10, for a portion where the X-ray film f can be arranged so as to be substantially parallel to the longitudinal axis center vertical plane F1 of the tooth and the surrounding tissue). ), For α = 15 °, for α = 30 °, it is sufficient for practical use to prepare about three types in advance. The intraoral film fixing device 3 is fixed at a predetermined position of the patient's dental mold cover 50 created in advance in this way,
It is stored integrally with the dental mold cover 50 of the patient. Then, at the time of use (at the time of X-ray photography), it is used in combination with the U-shaped arm attachment 4 side in the state as shown in FIG.

The structure of the U-shaped arm 5 is, for example, a combination of three arms A, B and C as shown in FIG.
An arm A supported at one end by the attachment 4 is connected to an intermediate arm B, and the arm B is connected to an arm C to which an extraoral parallel plate 6 is attached. Arm B can be slide-adjusted to the left and right in the figure with respect to arm A (arrow h)
Further, the arm C is slidably adjustable (arrow i) and rotatable (arrow j) with respect to the arm B in the vertical direction in the drawing. Furthermore, the arm A has an attachment 4
It is attached so as to be rotatable (arrow k). With the attachment 4 attached to the intraoral film fixing device 3, the position of the extraoral parallel plate 6 can be adjusted back and forth by sliding between the arm A and the arm B, and the interval adjustment scale 11 provided for adjustment in that case is an arm. It is attached to A. Moreover, as a result of the arm C to which the extraoral parallel plate 6 is attached expanding and contracting due to the slide between the arms B and C, the position of the extraoral parallel plate 6 can be adjusted along that direction (mesiodistal direction). In some cases, the arm C is provided with an extraoral parallel plate telescopic scale 12.

Further, by rotating the arm C with respect to the arm B, the angle of the plate surface of the extraoral parallel plate 6 can be adjusted.
In this case, the arm B is provided with an extraoral parallel plate mounting angle scale 13. Moreover, the arm A is attached to the attachment 4.
By rotating, the entire U-shaped arm 5 can be rotated. An angle scale 14 for the entire rotation in this case is attached to the arm A on the support side. The angle adjustment is practically sufficient only by adjusting the angle of the extraoral parallel plate 6 by rotating the arm C in a range where the inclination angle (α) of the X-ray film surface is small. However, as the angle α of the film holder 31 that regulates the installation state of the X-ray film f increases, as shown in FIG.
As shown in, the bisector surface obtained by the bisector method
Since F2 is also inclined, the angle is adjusted to the state of the extraoral parallel plate 6 to the state of 6b (dashed line) by simply rotating the arm C so that it is parallel to the bisector plane F2, and photographing is performed. In that case, the X-ray irradiation center line perpendicular to the extraoral parallel plate 6b is a2, which is different from the case where the X-ray irradiation center line is a1. On the other hand, by adjusting the rotation of the arm A, the entire U-shaped arm 5 including the extraoral parallel plate 6 can be moved in the vertical direction.
As shown in 6a, the bisector F2 is moved downward.
Can be parallel to. Therefore, if X-ray irradiation is performed with the irradiation parallel center line a1 (that is, also perpendicular to the bisector plane F2) as the aiming at the extraoral parallel plate 6a in that case, the above-mentioned deviation will also occur. It can be relaxed, can be adjusted more finely, and can be more versatile as a common auxiliary tool. The scales 11, 12, 13, and 14 of the above-mentioned adjustment elements can be used when the patient is in a desired adjustment state if the necessary reading is given with reference to a specific adjustment position (for example, 0 scale). By recording the readings in the chart, it is possible to easily reproduce the same condition based on the recording even when the same portion is repeatedly photographed later.

In this way, the U-shaped arm 5 can easily change the distance and direction between the extraoral parallel plate 6 and the bisector F2 in the clinical setting. There are individual differences in this, but even with such individual differences in patients, this common aid can achieve the necessary adjustments, and there are graduations such as angle and distance, so that any oral shape Is also available. Therefore, in relation to the intraoral film fixing device 3 mounted via the patient's tooth-shaped cover 50, the extraoral parallel plate 6 connected to the film fixing device 3 by the U-shaped arm 5 is used in clinical situations. At any angle, back and forth, up and down, left and right (mesio-distal direction)
Can be changed three-dimensionally over each element of
The degree of relative adjustment between the film fixing device 3 and the extraoral parallel plate 6 can be confirmed by a scale.

Further, the structure of the extraoral parallel plate 6 is irradiated with X-rays as shown by the alternate long and short dash line in FIG. 1, so that the thin plate-like material made of a material that easily transmits X-rays does not hinder photographing. It has become. Similarly, the arm 5, the attachment 4, the film fixing device 3, and the holder 31 that are to be in the X-ray irradiation range are also formed of a material through which X-rays easily pass. Further, as shown in FIG. 7, a circle 61 having a predetermined diameter is drawn in the center of the surface of the plate opposite to the X-ray imaging apparatus of the parallel plate 6 outside the oral cavity. Visible light is emitted from the optical fiber cable 9 on the side of the image taking device body 1.

8A and 8B are views showing an example of attachment of the optical fiber cable 9, in which the cone portion 2 is
It is composed of an X-ray imaging device cone 23 and an X-ray imaging device outer cone 24.
The respective tip fixing portions 22a to 22d for fixing the tips of the two branched optical fiber cables 9 are arranged at intervals of 90 ° on the circumference of a predetermined diameter centered on the cone central axis (A in the figure). ). It should be noted that the tip fixing portions 22a to 22d are preferably provided with lenses 25a to 25d, respectively. In this way, the visible light is guided from the light source device 8 to the cone portion 2 through the four optical fiber cables 9, and the ends thereof are attached to the outer circumference of the cone 22 of the X-ray imaging apparatus 1 in four rows in parallel. From the tip of the cable, spot visible light having a diameter of 3 to 5 mm is irradiated toward the extraoral parallel plate 6 in a state parallel to the X-ray irradiation center line. As a result, the X-ray irradiation center line is perpendicular to the extraoral parallel plate 6 at the time of imaging,
Moreover, the spot S of visible light guided by the optical fiber cable 9 that the distance to the extraoral parallel plate 6 of the X-ray imaging apparatus main body 1 is always the same distance is set on the plate surface (FIG. 7) of the extraoral parallel plate 6. You can check by hitting.

Now, in the field of actual photographing, the photographing assisting apparatus having the assisting tools on each side as shown in FIG. 1 is attached to the patient, and the above-mentioned adjustment of the extraoral parallel plate 6 is also performed. When attempting to perform X-ray imaging of the target imaging site in the previously performed state (In addition, adjustment to make the extraoral parallel plate 6a parallel to the bisector F2 at the optimum position as shown in FIG. 6) The work can be done exactly once, and from now on, it is sufficient to follow the record at the time of the adjustment) .To determine the shooting position on the device main body side, including the direction of X-ray irradiation, can be done as follows. it can. That is, when positioning the image, four spot visible rays are applied to the vicinity of the circle 61 drawn on the surface of the extraoral parallel plate 6, and all four spots S are gathered on the same circumference as shown in FIG. By aligning the position of the main body 1 of the radiographic apparatus, the X-ray irradiation center line passes through the center of the circle 61 and becomes perpendicular to the extraoral parallel plate 6 in the used state of FIG. As a result, it is also perpendicular to the bisector plane F2. In this way, the position of the X-ray imaging apparatus main body 1 can be determined with respect to the direction of X-ray irradiation by aiming the parallel plate 6 outside the oral cavity.

Further, the distance between the tip of the cone portion 2 and the extraoral parallel plate 6 is judged based on the size of the diameter of the spot S on the surface of the extraoral parallel plate 6. In advance, set the spot diameter when the distance becomes a predetermined size (for example, 7 cm) as the target spot diameter,
If the X-ray imaging apparatus main body 1 is moved back and forth with respect to the extraoral parallel plate 6 (positions are adjusted forward and backward in the direction of the one-dot chain line in FIG. 1) so that the spot diameter becomes the target size, the X-ray The distance from the tip of the imaging device cone portion 2 to the extraoral parallel plate 6 can be almost always set to a preset value. On the other hand, the distance from the parallel plate 6 outside the oral cavity to the X-ray film f fixed in the oral cavity of the patient by the holder 31 of the film fixing device 3 is desired by adjusting the U-shaped arm 5 portion on the side of the imaging auxiliary device. The value L is set to a value, and as a result, the distance L from the X-ray generation source in FIG. 1 can be set to a predetermined constant value substantially at all times. In this way, the extraoral parallel plate 6
Also, the position of the X-ray imaging apparatus main body 1 can be determined with respect to the X-ray irradiation distance. After the positioning as described above, a film image may be obtained by performing X-ray photographing as usual, and thus, according to the oral X-ray standard photographing apparatus of the present invention, the bisection method is followed. X-ray photography can be performed appropriately.

Further, according to the present apparatus, a fixed metal piece is attached to, for example, the film fixing device 3 in the photographing auxiliary device,
It is also possible to grasp the enlargement ratio of the film image. Here, the grasp of the enlargement ratio of the film image is from the following viewpoint. That is, as shown in FIG. 10, since there is a space between the X-ray film surface Ff and the long axis center vertical surface F1 of the tooth and the surrounding tissue, the film image obtained by the X-ray film f is slightly enlarged from the actual image. It will be the image that was made. Therefore, for this reason, in the present invention, a fixed titanium piece such as that shown by reference numeral 32 in FIGS. 1, 2 and 4 is attached to the film fixing device 3 to facilitate grasping the enlargement ratio. The fixed titanium piece 32 has an L shape as shown in FIG.
The dimensions L1 and L2 of the legs arranged on the long surface (top surface) and the short surface (side surface) are set to predetermined values in advance. In this way, the size of the titanium piece is determined in advance, and the titanium piece is
If the horizontal direction (L1) component and the vertical direction (L2) component of the L-shaped image 32 projected on the film f are used as reference images obtained by the photographing, the enlargement ratio can be properly grasped. Further, for example, the thickness t (see FIG. 5) is set in advance so that the light brightness and the degree of blackening of the film image by the titanium piece 32 become the same as the value indicating the bone mineral content of the jaw bone of a healthy person. If set, the light intensity and the degree of blackening of the film image obtained by passing through the titanium piece 32 are based on this, and the bone mineral content of the jawbone of the patient's imaging site It can also be useful when comparing the amount of bone mineral.

With the above apparatus, the same conditions (direction and distance) are guaranteed over the years even when the same portion is imaged again. Positioning by visual inspection requires considerable skill, or the position tends to be different each time, but avoiding such a situation, it is stable and easy to take images by conventional visual inspection. It is possible to obtain images with higher accuracy than that of, and to accurately compare and track changes over time in the ecology. Therefore, it is also possible to appropriately grasp the change in the pathological condition and take an early action.

Further, it is also advantageous in reducing the amount of X-ray exposure and preventing germs. That is, conventionally, there is no measure outside the patient's mouth, so there is a tendency to set the X-ray irradiation range to a wide range.
Exists as a guide to suppress such a tendency, and since X-rays can be focused and imaged in the area of the minimum required source, the amount of conventional radiation exposure can be reduced to 1 /
Can be reduced to 10 or less. Also, unlike the conventional method of holding the film at the patient's fingertips in the completely disinfected surgical area,
Since the patient's fingertips do not touch, it is possible to take pictures in a hygienic and stable state.

FIG. 9 shows the construction of the cone portion 2 on the X-ray imaging apparatus main body side in another embodiment of the present invention. In the present embodiment, the spot visible light irradiating unit 26 for the extraoral parallel plate 6 is replaced by 90 ° at the tip portion of the cone portion 2 instead of the configuration in which the visible light is guided from the light source device using the optical fiber cable as in the above embodiment. The structure is to incorporate four directly at intervals. Each spot visible light irradiation unit 26 has a light emitting diode 27 powered by a built-in battery, and a lens is similarly provided at the tip.
25 is provided. In the case of this configuration, it is not necessary to use the light source device 8 and the optical fiber cable 9 as shown in FIG. 1, and the configuration is simple.

Further, in this embodiment, the X inside the cone portion 2 is
A filter 29 having a lead plate 28 is arranged near the ray generation source, and the aperture is set to be small so as to regulate X-ray irradiation. As a result, the range of X-ray irradiation can be further limited, and each of the above spot visible light irradiation units
Since it is possible to prevent the X-rays from hitting the 26, it is possible to surely prevent deterioration such as a yellowing phenomenon caused by the X-ray irradiation of the lens 25 of the spot visible light irradiation unit 26.

The present invention is not limited to the above-described embodiments, but various modifications and variations are possible. For example, when the extraoral parallel plate is movably connected to the film fixing device, when the U-shaped arm 5 as shown in FIG. 3 is used, the arm B may be rotatable with respect to the arm A. Alternatively, the arm A may be attached to the attachment 4 so that it can be slidably adjusted.
The flexibility can be further increased by adding such an adjusting element. Further, it is more preferable that the slide adjustment and the rotation adjustment can be performed by a predetermined amount with a click feeling. Further, it is desirable to provide a fixing tool for surely preventing the movement of the adjusted state after use so that the adjusted state does not change during use. Further, although the standard metal piece attached to the film fixing device is titanium, other metal such as aluminum may be used.

[0028]

According to the oral X-ray imaging apparatus of the present invention, X
Since the positioning of the main body of the X-ray imaging device does not depend on visual positioning and can be performed appropriately as a guide that allows direct visual observation of the outer plate of the oral cavity, even when re-imaging the same location, the same conditions are guaranteed over the years and reproducibility As a result, it is possible to obtain an image with higher accuracy than that obtained by conventional visual measurement, and it is possible to accurately compare and track secular changes. Therefore, it becomes possible to appropriately grasp the changes in the pathological condition and take early measures, and the effect is great in the X-ray photography at the time of dental treatment. Further, if the outer plate of the oral cavity is an outer parallel plate parallel to the bisector surface in the so-called bisector method, the bisector surface of the oral cavity, which is conventionally considered to be difficult to grasp, is With outer parallel plates,
Since it becomes apparent outside the oral cavity of the patient, the X-ray photography according to the bisection method can be performed in the field of photography much more easily than in the past. That is, the outer plate of the oral cavity can be set to the film fixing device so as to be parallel to the bisector surface in a state where the tooth profile cover is removed from the tooth portion,
At the time of actual photographing, the tooth profile cover may be attached to the tooth portion and positioned so that X-rays are incident perpendicularly to the extraoral parallel plate. In addition, if the state of X-ray irradiation is confirmed by applying a spot of visible light to the outer plate of the oral cavity, more appropriate positioning can be performed. If the angle, the front-rear position, etc. can be freely changed as needed and the adjustment degree of the outer plate of the oral cavity can be confirmed by a scale, it is possible to widely cope with individual differences in the shape of the oral cavity. In addition, a fixed metal piece is attached to the film fixing device to facilitate grasping the enlargement ratio, and the light intensity and blackening degree of the film image obtained by transmitting this metal by the metal piece are used. However, it can be used for comparison and comparison with a value indicating the bone mineral content of the jawbone of a healthy person.

[Brief description of drawings]

FIG. 1 is a diagram showing the overall configuration of an embodiment of an oral X-ray standard imaging apparatus according to the present invention.

FIG. 2 is an explanatory diagram for assembling the parallel plate outside the oral cavity to the intraoral film fixing device portion.

FIG. 3 is a plan view of an attachment, a U-shaped arm, and an extraoral parallel plate portion.

FIG. 4 is a perspective view showing a patient auxiliary tool including a tooth-shaped cover and an intraoral film fixing device.

FIG. 5 is a diagram showing an example of a metal piece.

FIG. 6 is a diagram showing an example of adjustment by a U-shaped arm.

FIG. 7 is a diagram showing a specific example of an extraoral parallel plate.

FIG. 8 is an end view (A) and a side view (B) of the cone portion of the X-ray imaging apparatus.

FIG. 9 is a diagram showing a configuration of a cone portion on the X-ray imaging apparatus main body side in another embodiment of the oral X-ray standard imaging apparatus according to the present invention.

FIG. 10 is a schematic explanatory diagram of a bisection method.

[Explanation of symbols]

 1 X-ray imaging device 2 X-ray imaging device cone part 3 Oral film fixing device 4 U-shaped arm attachment 5 U-shaped arm 6 Extraoral parallel plate 8 Light source device 9 Optical fiber cable 11 Spacing adjustment scale 12 Extraoral parallel plate expansion / contraction scale 13 Scale for mounting parallel plate outside the oral cavity 14 Scale for turning the entire U-shaped arm 22, 22a to 22d Fixed part for optical fiber cable tip 23 X-ray imaging device cone 24 X-ray imaging device outer cone 26 Spot visible light irradiation part 27 Light emitting diode 31 Film holder 32 Regular titanium piece 33 Pin insertion hole 41 Pin 50 Tooth profile 61 Circle A to C Arm S Spot f X-ray film F1 Long axis center vertical plane of tooth and surrounding tissue F2 Bisecting plane a, a1, a2 X-ray irradiation Center line

Claims (6)

[Claims] 1. An apparatus for X-raying a tooth and a tissue surrounding a tooth by X-ray irradiation, wherein a film fixing device for holding a dental film in the oral cavity is provided on a tooth-shaped cover and is connected to the film fixing device. Attach a plate so that it can be displaced outside the oral cavity, and
An oral X-ray standard radiographing apparatus, which is configured as a guide for setting an X-ray irradiation direction and an irradiation distance from the main body of the radiographic apparatus. 2. A bisector of the film surface of a dental film fixed in the oral cavity by the film fixing device and a plane perpendicular to the long axis center of the teeth and peripheral tissues of the imaging site An oral X-ray standard imaging apparatus characterized by being parallel. 3. A visible light irradiation section is provided on the X-ray imaging apparatus main body side, and a plurality of visible light spots are applied from this visible light section to the plate surface of the oral cavity external plate, whereby the oral external panel is attached. The oral X-ray according to claim 1 or 2, wherein the X-ray irradiation is vertical and the distance between the outer plate of the oral cavity and the main body of the X-ray imaging apparatus can be visually confirmed. Standard photography device. 4. The film outer surface of the oral cavity is movable with respect to the film fixing device, and the angle of the plate surface outside the oral cavity relative to the film fixing device and the degree of position adjustment can be recognized by a scale. The oral X-ray standard imaging apparatus according to any one of claims 1 to 3. 5. The film fixing device is provided with a fixed metal piece, and the enlargement ratio of the film image can be grasped based on a photographed image by the metal piece.
The oral X-ray standard imaging apparatus according to any one of 1. 6. The fixed metal piece to be attached is such that the light intensity and the blackening degree of the film image obtained by passing through the metal piece are the same as the values showing the bone mineral content of the jawbone of a healthy person. The oral X-ray standard photographing apparatus according to claim 5, which is selected.