Small dental film shooting system based on CBCT equipment

Abstract

The present invention relates to the technical field of oral medical equipment, and particularly relates to a small dental film shooting system based on a CBCT device, including a parameter setting module, a shooting trajectory control module, and a universal small dental film jaw support device. Among them, the parameter setting module is used to select the tooth position to be photographed and determine the movement parameters of the rotating arm of the CBCT device. The shooting trajectory control module is used to control the movement of the rotating arm according to the movement parameters, so that in the horizontal direction, the rays emitted by the high-voltage light source of the CBCT device are perpendicular to the tooth position to be photographed. The universal small dental film jaw support device is used to adjust the head position of the human body, so that in the vertical direction, the rays emitted by the high-voltage light source are perpendicular to the tooth position to be photographed. The small dental film shooting system based on the CBCT device provided by the present invention enables the existing CBCT device to add the small dental film shooting function, expands the application range of the CBCT device, can replace the traditional dental X-ray machine, and can save more operating costs for the clinic, which has important practical significance.

Description

Technical Field

[0001] The present invention relates to the technical field of oral medical devices, and particularly relates to a small dental film shooting system based on a CBCT device. Background Art

[0002] A dental X-ray machine usually consists of an X-ray generating device and its supporting components, and is used in conjunction with an intraoral image receiver for X-ray photography of teeth to obtain images for clinical diagnosis. Generally, it can simultaneously take two-dimensional images of 1 to 4 teeth. Its advantage is that it can truly reproduce the relative positions of teeth, gums, tooth bones, etc. in the oral cavity at a 1:1 ratio, which can help determine the degree of caries of individual teeth, the scope of inflammation spread, the condition of the bones around the teeth, the situation of adjacent teeth, and so on.

[0003] Dental CBCT, also known as oral and maxillofacial cone beam CT and digital volume tomography. The CBCT device mainly includes a high-voltage light source, a flat panel detector, and a motion system. The high-voltage light source is responsible for generating X-rays, the flat panel detector is responsible for receiving X-rays, and the motion system is responsible for driving the high-voltage light source and the flat panel detector to move and rotate. The CBCT device can complete the oral scan of a patient within a dozen seconds, and then generate high-precision three-dimensional images, which can observe data such as the bone density of the tooth bed, the height and width of the alveolar bone itself in all directions of 360°. It can not only reconstruct the structure of the entire craniofacial region and measure the maxillofacial bone structure, but also reconstruct fine anatomical details.

[0004] According to the "Basic Standards for Medical Institutions (Trial)" 2017 edition issued by the National Health Commission, dental clinics must be equipped with X-ray dental machines. At the same time, for clinics to carry out orthodontic and implant operations, dental CBCT is also an essential device. Therefore, dental clinics generally equip two types of X-ray imaging devices: dental X-ray machines and CBCTs.

[0005] According to the national standard "GBZ130-2020 Requirements for Radiological Protection of Medical X-ray Diagnosis", these two independent X-ray imaging devices must be placed in two separate shielding rooms respectively. Whether considering the construction cost of the shielding rooms, the separate procurement cost of the two devices, or the rental cost of the rooms, the existing configuration method of clinic imaging devices increases the opening and operating costs of dental clinics. Realizing the function of a dental X-ray machine using CBCT can save significant costs for customers. Therefore, the dental film shooting solution based on CBCT has important practical significance. Summary of the Invention

[0006] In order to solve the technical problem in the prior art that dental clinics need to be equipped with both dental X-ray machines and CBCT devices simultaneously, resulting in high costs, the present invention proposes a small dental film shooting system based on a CBCT device, enabling the CBCT device to add a new function, capable of shooting small dental films, replacing traditional dental X-ray machines, and saving more opening and operating costs for clinics.

[0007] The technical solution of the present invention:

[0008] A small dental film shooting system based on a CBCT device, comprising:

[0009] A parameter setting module, used to select the tooth position to be photographed and determine the movement parameters of the rotating arm of the CBCT device;

[0010] A shooting trajectory control module, used to control the movement of the rotating arm according to the movement parameters, so that in the horizontal direction, the rays emitted by the high-voltage light source of the CBCT device are perpendicular to the tooth position to be photographed;

[0011] A universal small dental film jaw support device, used to adjust the head position of the human body, so that in the vertical direction, the rays emitted by the high-voltage light source are perpendicular to the tooth position to be photographed.

[0012] Furthermore, the parameter setting module is also used to determine the exposure dose, and the exposure dose includes exposure voltage, exposure current, and exposure time.

[0013] Furthermore, the exposure dose and the movement parameters of the rotating arm are preset according to different tooth positions to be photographed.

[0014] Furthermore, the movement parameters of the rotating arm include a rotation center translation parameter and a rotation angle parameter. The shooting trajectory control module controls the rotation center of the rotating arm to move a certain distance along the symmetry center line of the dental arch curve from the starting position to the target position according to the rotation center translation parameter, and the shooting trajectory control module controls the rotating arm to rotate a certain angle according to the rotation angle parameter, so that in the horizontal direction, the rays emitted by the high-voltage light source are perpendicular to the tooth position to be photographed;

[0015] When the rotation center of the rotating arm moves a certain distance to reach the target position, in the horizontal direction, the connection line between the rotation center of the rotating arm and the tooth position to be photographed is perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed; after the rotating arm rotates a certain angle, in the horizontal direction, the rays emitted by the high-voltage light source are perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed.

[0016] Further, the universal small dental film jaw support device includes an upper jaw support and a lower jaw support. The upper jaw support includes a universal sphere and a support portion for supporting the human head. The lower jaw support includes a universal ball seat and a support portion for supporting and fixing. The upper jaw support and the lower jaw support perform universal movement through the cooperation of the universal sphere and the universal ball seat.

[0017] Further, a plurality of ball plungers are evenly arranged on the universal sphere, and a number of circular hole grooves are evenly arranged in the universal ball seat. When the universal sphere and the universal ball seat perform universal movement, the ball heads of the ball plungers are snapped into the circular hole grooves for positioning.

[0018] Further, the universal sphere includes a first longitude frame body and a second longitude frame body that are perpendicular to each other. A common ball plunger is provided at the bottom connection point of the first longitude frame body and the second longitude frame body. A plurality of ball plungers are evenly arranged on the first longitude frame body at intervals of M degrees, and a plurality of ball plungers are also evenly arranged on the second longitude frame body at intervals of M degrees. A number of circular hole grooves are evenly arranged in the universal ball seat at intervals of N degrees in the longitude and latitude directions, where both M and N are positive integers, and M is an integer multiple of N.

[0019] Further, the small dental film shooting system based on a CBCT device further includes a positioning device. The positioning device includes an extraoral positioning ring, a connecting rod, and an intraoral occlusion portion. The extraoral positioning ring is perpendicular to the connecting rod. When the intraoral occlusion portion is occluded, the connecting rod is perpendicular to the tooth position to be photographed. The head position of the human body is adjusted through the universal small dental film jaw support device until the extraoral positioning ring is aligned with the high-voltage light source.

[0020] Further, the connecting rod is an extendable telescopic structure.

[0021] Further, the small dental film shooting system based on a CBCT device further includes an intraoral image receiver for imaging.

[0022] After adopting the above technical solution, a small dental film shooting system based on a CBCT device provided by the present invention has the following beneficial effects compared with the prior art: The present invention selects the tooth position to be photographed through the parameter setting module, and then controls the movement of the rotating arm through the shooting trajectory control module so that the high-voltage ray is perpendicular to the tooth position to be photographed in the horizontal direction, and adjusts the head position of the human body through the universal small dental film jaw support device so that the high-voltage ray is perpendicular to the tooth position to be photographed in the vertical direction, thereby finally ensuring that the ray is perpendicular to the plane where the tooth position to be photographed is located in the dental arch plane, enabling the existing CBCT device to add the small dental film shooting function, expanding the application range of the CBCT device, replacing the traditional dental X-ray machine, and saving more operating costs for the clinic, which has important practical significance. Description of the Drawings

[0023] Figure 1 Schematic diagram of the working principle of the parameter setting module and the shooting trajectory control module of the present invention;

[0024] Figure 2 Schematic diagram of the overall structure of the universal small dental film jaw support device of the present invention;

[0025] Figure 3 Explosion diagram of the universal small dental film jaw support device of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the positioning device of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the connecting rod in the positioning device of the present invention.

[0028] Among them,

[0029] Upper jaw support 1, supporting part 11, universal spherical body 12, first longitude frame body 121, second longitude frame body 122, ball plunger 13; lower jaw support 2, supporting part 21, universal ball seat 22, round hole groove 23; external oral positioning ring 31, connecting rod 32. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] As Figures 1-5 shown, this embodiment provides a small dental film shooting system based on a CBCT device, including a parameter setting module, a shooting trajectory control module, and a universal small dental film jaw support device. This system can enable the existing CBCT device to have the function of shooting small dental films.

[0033] Specifically, the parameter setting module is used to set relevant parameters, such as parameters for selecting the tooth position to be photographed and determining the movement parameters of the rotating arm of the CBCT device. These can be set through the software interface of the workstation. After the setting is completed, the movement parameters of the rotating arm are sent to the shooting trajectory control module.

[0034] The shooting trajectory control module controls the movement of the rotating arm according to the received movement parameters of the rotating arm, including but not limited to linear motion, rotational motion, etc., so that in the horizontal direction, the rays emitted by the high-voltage light source of the CBCT device are perpendicular to the tooth position to be photographed. That is, from a top-down view, the central ray emitted by the high-voltage light source is perpendicular to the tangent line of the tooth arch curve at the tooth position to be photographed, in order to ensure that adjacent teeth do not overlap as much as possible. However, since each tooth also has a certain inclination towards the lip side, in order to make the rays emitted by the high-voltage light source perpendicular to the plane of the tooth position to be photographed in the dental arch plane, adjustments in the vertical direction are also required.

[0035] For this, in this embodiment, a universal small dental film jaw support device is set to adjust the head position of the human body, so that in the vertical direction, the rays emitted by the high-voltage light source are perpendicular to the tooth position to be photographed. That is, from a side view, the central ray emitted by the high-voltage light source is perpendicular to the tooth position to be photographed. In this way, through adjustments in the horizontal and vertical directions, it is ensured that the rays emitted by the high-voltage light source are perpendicular to the plane of the tooth position to be photographed in the dental arch plane.

[0036] In this way, in this embodiment, the tooth position to be photographed is selected through the parameter setting module, and then the movement of the rotating arm is controlled by the shooting trajectory control module so that the high-voltage rays are perpendicular to the tooth position to be photographed in the horizontal direction, and the head position of the human body is adjusted by the universal small dental film jaw support device so that the high-voltage rays are perpendicular to the tooth position to be photographed in the vertical direction. Thus, ultimately, it is ensured that the rays are perpendicular to the plane of the tooth position to be photographed in the dental arch plane, and imaging is performed in cooperation with an intraoral image receiver such as an intraoral film, enabling the existing CBCT device to add the function of taking small dental films, expanding the application range of the CBCT device, being able to replace traditional dental X-ray machines, and saving more operating costs for the clinic, which has important practical significance.

[0037] As an embodiment of the present invention, the parameter setting module is also used to determine the exposure dose. The exposure dose includes exposure voltage, exposure current, and exposure time, and the dental film is made clearer through the optimal exposure dose. The exposure dose and the movement parameters of the rotating arm in this embodiment are preset for different tooth positions. When the tooth position to be photographed is selected, the system automatically selects the optimal exposure dose and the movement parameters of the rotating arm. Of course, in other embodiments, manual setting can also be performed.

[0038] As an embodiment of the present invention, the motion parameters of the rotating arm include a rotation center translation parameter and a rotation angle parameter. Among them, the rotation center translation parameter is the distance L, and the rotation angle parameter is the angle θ. Each tooth position to be photographed corresponds to different distances L and angles θ.

[0039] First, the shooting trajectory control module controls the rotation center of the rotating arm to move a distance L from the starting position along the symmetric center line direction of the dental arch curve according to the rotation center translation parameter to reach the target position, so that in the horizontal direction, the connection line between the rotation center of the rotating arm and the tooth position to be photographed is perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed. Specifically, as Figure 1 shown, when the rotating arm is at the starting position (the starting point O1 of the rotation center), it is far from the teeth. At this time, no matter how the rotating arm rotates, the X-ray emitted by the high-voltage light source F cannot be perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed. Therefore, according to the position of the tooth position to be photographed, the rotating arm needs to be moved a distance L from the starting position (the starting point O1 of the rotation center) to the target position (the rotation center point O2) first, so that the connection line between the target position, that is, the rotation center point O2, and the tooth position to be photographed is perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed.

[0040] Then, the shooting trajectory control module controls the rotating arm to rotate by an angle θ according to the rotation angle parameter, so that in the horizontal direction, the ray emitted by the high-voltage light source is perpendicular to the tooth position to be photographed. Specifically, as Figure 1 shown, when the rotation center of the rotating arm reaches the target position (the rotation center point O2), the rotating arm is controlled to rotate by an angle θ around the rotation center, so that the X-ray passes through the tooth position to be photographed, that is, in the horizontal direction, the ray emitted by the high-voltage light source is perpendicular to the tangent line of the dental arch curve at the tooth position to be photographed.

[0041] As an embodiment of the present invention, as Figures 2-3 shown, the universal small dental film jaw support device includes an upper jaw support 1 and a lower jaw support 2. The upper jaw support 1 includes a universal sphere 12 and a support portion 11 for supporting the human head. The lower jaw support 2 includes a universal ball seat 22 and a support portion 21 for supporting and fixing. The upper jaw support 1 and the lower jaw support 2 perform universal movement through the cooperation of the universal sphere 12 and the universal ball seat 22.

[0042] In theory, the universal movement between the universal sphere 12 and the universal socket 22 can be achieved by any one of the mating methods in the prior art. For example, a universal movement form with a certain damping can be formed through the frictional force between the universal sphere and the universal socket. However, in this form, there is no function of positioning the human head. When the human head is positioned in a suitable position, there is still a possibility of swinging, resulting in a change in the angle and affecting the shooting result. In this regard, in this embodiment, a plurality of ball plungers 13 are evenly arranged on the universal sphere 12. By adjusting the installation depth of the ball plungers 13, the upper jaw tray 1 can be smoothly inserted into the lower jaw tray 2 after being installed with the ball plungers 13 and will not fall off. At the same time, a plurality of round hole grooves 23 with the same size are evenly arranged in the universal socket 22, so that the ball heads of the ball plungers 13 will be stuck in the round hole grooves 23 when encountering them during the universal movement, playing a positioning role. In this way, not only can the adjustment of the universal angle be achieved, but also the effective support and positioning of the human mandible can be realized after adjustment, meeting the shooting requirements of bitewing radiographs.

[0043] The denser the distribution of the ball plungers 13 installed on the universal sphere 12 and the round hole grooves 23 in the universal socket 22, the smaller the minimum adjustment angle, but the higher the cost. In this embodiment, the structure of the universal sphere 12 is further simplified. Specifically, the universal sphere 12 includes a first longitude frame body 121 and a second longitude frame body 122 that are perpendicular to each other. The tops of the first longitude frame body 121 and the second longitude frame body 122 are integrally connected to the supporting part 11. A common ball plunger 13 is provided at the bottom connection point of the first longitude frame body 121 and the second longitude frame body 122. A plurality of ball plungers 13 are evenly arranged on the first longitude frame body 121 at an interval of M degrees with the common ball plunger 13 as the center, and a plurality of ball plungers 13 are also evenly arranged on the second longitude frame body 122 at an interval of M degrees with the common ball plunger 13 as the center. And a plurality of round hole grooves 23 are evenly arranged in the universal socket 22 at an interval of N degrees in the longitude and latitude directions, where both M and N are positive integers, and M is an integer multiple of N. Exemplarily, as Figure 3 shown, a total of 33 anti-loosening ball plungers 13 are included. Among them, 17 (including the common one at the bottom) are evenly arranged on the first longitude frame body 121 at an interval of 18 degrees, and 17 (including the common one at the bottom) are also evenly arranged on the second longitude frame body 122 at an interval of 18 degrees. And a plurality of round hole grooves 23 are evenly arranged in the universal socket 22 at an interval of 9 degrees in the longitude and latitude directions.

[0044] In this way, in this embodiment, by setting the universal sphere 12 to include a first longitude frame 121 and a second longitude frame 122 instead of a complete spherical surface, the structure of the universal sphere 12 and the number of ball plungers 13 required are simplified on the premise of meeting the angle adjustment requirements; and by setting the interval angle of the ball plungers 13 on the universal sphere 12 to be equal to or less than the interval angle of the circular hole grooves 23 in the universal ball seat 22, the number of ball plungers 13 can be further reduced on the premise of meeting the angle adjustment requirements.

[0045] The head position of the human body can be adjusted by this universal small film jaw support device. By adjusting the pitch angle and lateral angle of the upper jaw support 1, the dental arch curve is rotated by a certain angle, so that the rays emitted by the high-pressure light source are perpendicular to the plane where the tooth position to be photographed is located in the dental arch plane. As Figure 1 shown, let the inclination angle of the tooth of the tooth position to be photographed with the vertical line be β, then by rotating and adjusting the upper jaw support 1 by β angle in the vertical direction, the shooting requirement of perpendicular incidence of X-rays can be met.

[0046] The vertical inclination angles of the teeth at each photographed tooth position are different, so the corresponding rotation angles to be adjusted at each photographed tooth position are also different. Due to the symmetry of the dental arch, only 8 different vertical inclination angles at different positions are required to shoot 14 dental films. During shooting, adjust the obliquely placed upper jaw support 1 according to the vertical inclination angle corresponding to the tooth position to be photographed, and let the patient adapt to the position of the upper jaw support 1, that is, adjust the position in the vertical direction according to a limited number of vertical inclination angles. According to the vertical positioning requirements of the small dental film, the specific inclination directions and inclination angles of each photographed tooth position are shown in Table 1 below. Slight adjustments can be made during use, varying from person to person.

[0047] Table 1

[0048]

[0049]

[0050] Although the head position of the human body can be adjusted by setting the above-mentioned universal small film jaw support device, in actual operation, it is still impossible to determine whether the head position of the human body is appropriate only through ordinary observation with the naked eye. Therefore, in order to ensure the accuracy of the swing angle as much as possible, this embodiment is also provided with a positioning device to assist in positioning. Specifically, as Figure 4As shown, the positioning device includes an external positioning ring 31, a connecting rod 32, and an internal occlusal part (not shown in the figure). The external positioning ring 31 is perpendicular to the connecting rod 32. When the internal occlusal part bites, the connecting rod 32 is perpendicular to the tooth position to be photographed. The head position of the human body is adjusted through the universal small dental film jaw support device until the ring opening of the external positioning ring 31 is aligned with the high-voltage light source. In this way, during shooting, by using this positioning device in cooperation, the positioning angle of the human head can be made more accurate. It should be noted that since the positions and angles of different teeth to be photographed are different, corresponding positioning devices need to be equipped for different teeth to be photographed so that the connecting rod 32 is perpendicular to the teeth to be photographed.

[0051] Preferably, as Figure 5 shown, the connecting rod 32 is an extendable telescopic structure. Since the distance between the high-voltage light source of the CBCT device and the tooth to be photographed cannot be adjusted during small dental film shooting using the CBCT device, the distance between the external positioning ring 31 and the high-voltage light source can be reduced through the extension structure to ensure that the external positioning ring 31 is aligned with the high-voltage ray, thereby ensuring the accurate positioning angle of the human head.

[0052] Preferably, during the shooting process, the detector lift parameter can also be set through the parameter setting module to increase the space of the human body inside the rotating arm.

[0053] The working principle and working steps of the small dental film shooting system based on the CBCT device in this embodiment are described below:

[0054] Step S1: Select the tooth position to be photographed through the software interface parameter setting module at the workstation end and send the small dental film shooting mode parameters;

[0055] There are corresponding default exposure dose parameters and rotating arm movement parameters for different teeth to be photographed. The exposure dose parameters include exposure voltage, exposure current, and exposure time. The rotating arm movement parameters include rotation center translation parameters and rotation angle parameters. For example, to photograph the upper left No. 4 tooth, according to the preset rotation center translation parameters and rotation angle parameters required for this tooth position to be photographed, the positional relationship between the high-voltage light source in the horizontal direction and the dental arch curve is given to ensure that the ray emitted by the high-voltage light source is perpendicular to the tangent line where the No. 4 tooth to be photographed is located on the dental arch curve.

[0056] Step S2: The shooting trajectory control module controls the movement of the rotating arm according to the sent parameters, moves the rotation center and rotation angle of the rotating arm to a specific position, and enters the small dental film shooting mode;

[0057] First, the rotating arm makes a translational motion so that the rotation center moves a certain distance from the starting position to the target position. Then, the rotating arm makes a rotational motion, rotating a certain angle around the rotation center. Through the coordination of the translational motion and the rotational motion, the requirement that the ray emitted by the high-pressure light source is perpendicular to the tangent line of the dental arch curve where the No. 4 tooth to be photographed is located in the horizontal direction is satisfied. Of course, the rotational motion can also be carried out first and then the translational motion. The present invention does not limit the sequence of the two motions.

[0058] Step S3: Adjust the tilt angle through the universal small dental film jaw support device, position the patient to reach the preset value to meet the shooting requirements of the small dental film, and then take the shot.

[0059] According to the tilt angle requirement of the tooth position to be photographed, such as the No. 4 tooth position mentioned above, adjust the tilt angle of the upper jaw support 1 in the universal small dental film jaw support device. The patient adapts to the position of the upper jaw support 1 and holds the intraoral occlusion part in the corresponding positioning device. Appropriately adjust the tilt angle of the upper jaw support 1 according to the alignment relationship between the extraoral positioning ring 31 in the positioning device and the high-pressure light source, so as to ensure that the ring opening of the extraoral positioning ring 31 is aligned with the high-pressure ray window, so that the tooth to be photographed is also perpendicular to the ray in the vertical direction, that is, it meets the shooting requirement that the high-pressure ray is vertically incident on the tooth position to be photographed. Then, cooperate with the intraoral film to take the shot.

[0060] As can be seen from the above, a small dental film shooting system based on a CBCT device provided in this embodiment enables the existing CBCT device to add the function of shooting small dental films, expands the application range of the CBCT device, can replace the traditional dental X-ray machine, and can save more operating costs for the clinic, which has important practical significance.

[0061] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A small dental film shooting system based on a CBCT device, characterized in that, Including: A parameter setting module, configured to select a tooth position to be photographed and determine the motion parameters of the rotating arm of the CBCT device; A shooting trajectory control module, configured to control the movement of the rotating arm according to the motion parameters, so that in the horizontal direction, the ray emitted by the high-voltage light source of the CBCT device is perpendicular to the tooth position to be photographed; A universal small dental film jaw support device, configured to adjust the head position of the human body, so that in the vertical direction, the ray emitted by the high-voltage light source is perpendicular to the tooth position to be photographed; The parameter setting module is further configured to determine the exposure dose, and the exposure dose includes exposure voltage, exposure current and exposure time; The motion parameters of the rotating arm include a rotation center translation parameter and a rotation angle parameter. The shooting trajectory control module controls the rotation center of the rotating arm to move a certain distance along the symmetry center line of the dental arch curve from the starting position to the target position according to the rotation center translation parameter. The shooting trajectory control module controls the rotating arm to rotate a certain angle according to the rotation angle parameter, so that in the horizontal direction, the ray emitted by the high-voltage light source is perpendicular to the tooth position to be photographed; When the rotation center of the rotating arm moves a certain distance to reach the target position, in the horizontal direction, the connection line between the rotation center of the rotating arm and the tooth position to be photographed is perpendicular to the tangent line of the dental arch curve where the tooth position to be photographed is located; after the rotating arm rotates a certain angle, in the horizontal direction, the ray emitted by the high-voltage light source is perpendicular to the tangent line of the dental arch curve where the tooth position to be photographed is located; The universal small dental film jaw support device includes an upper jaw support (1) and a lower jaw support (2). The upper jaw support (1) includes a universal spherical body (12) and a support portion (11) for supporting the human head. The lower jaw support (2) includes a universal spherical seat (22) and a support portion (21) for supporting and fixing. The upper jaw support (1) and the lower jaw support (2) perform universal movement through the cooperation of the universal spherical body (12) and the universal spherical seat (22); The small dental film shooting system based on the CBCT device further includes a positioning device. The positioning device includes an extraoral positioning ring (31), a connecting rod (32) and an intraoral occlusal portion. The extraoral positioning ring (31) is perpendicular to the connecting rod (32). The connecting rod (32) is perpendicular to the tooth position to be photographed when the intraoral occlusal portion is occluded. The head position of the human body is adjusted by the universal small dental film jaw support device until the extraoral positioning ring (31) is aligned with the high-voltage light source.

2. The small dental film shooting system based on a CBCT device according to claim 1, wherein The exposure dose and the motion parameters of the rotating arm are preset according to different tooth positions to be photographed.

3. The small dental film shooting system based on a CBCT device according to claim 1, wherein A plurality of ball head plungers (13) are evenly arranged on the universal spherical body (12), and a plurality of circular hole grooves (23) are evenly arranged in the universal spherical seat (22). When the universal spherical body (12) and the universal spherical seat (22) perform universal movement, the ball head of the ball head plunger (13) is clamped into the circular hole groove (23) for positioning.

4. The small dental film shooting system based on a CBCT device according to claim 1, wherein The universal sphere (12) includes a first longitude frame body (121) and a second longitude frame body (122) that are perpendicular to each other. A common ball plunger (13) is provided at the bottom connection point of the first longitude frame body (121) and the second longitude frame body (122). A plurality of ball plungers (13) are evenly arranged on the first longitude frame body (121) at intervals of M degrees, and a plurality of ball plungers (13) are also evenly arranged on the second longitude frame body (122) at intervals of M degrees. A number of circular hole grooves (23) are evenly arranged in the longitude and latitude directions in the universal ball seat (22) at intervals of N degrees, where both M and N are positive integers, and M is an integer multiple of N.

5. The small dental film shooting system based on a CBCT device according to claim 1, wherein The connecting rod (32) is an extendable telescopic structure.

6. The small dental film shooting system based on a CBCT device according to claim 1, characterized in that The small dental film shooting system based on the CBCT device further includes an intraoral image receiver for imaging.

Images