A depth-adaptive bur and tooth grinding machine for tooth surface angles
By designing a depth-adapting bur that fits the angle of the tooth surface, and using a combination of ball drills and disc drills, the problem of grinding the gums during veneer preparation was solved, achieving precise tooth tissue removal and simplifying the operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AFFILIATED STOMATOLOGICAL HOSPITAL OF XIAMEN MEDICAL COLLEGE (XIAMEN STOMATOLOGICAL HOSPITAL)
- Filing Date
- 2025-03-14
- Publication Date
- 2026-05-26
AI Technical Summary
In the preparation process for dental veneers, existing techniques often require burs to be used at a depth that is difficult to adapt to the angle of the tooth surface, resulting in grinding the gums or leaving unnecessary depth marks, which affects the depth setting effect.
A depth-adapting bur that adapts to tooth surface angles has been designed, comprising a ball drill and multiple disc drills. The ball drill is used for depth determination at the cervical region of the tooth, while the disc drills are used for depth determination at the body and incisal edge. By segmenting the grinding process to adapt to the tooth surface angle, it avoids accidental damage to the gingiva, and ensures consistent grinding depth through equal or gradient depth design.
This technology helps avoid accidental damage to the gums during tooth preparation, reduces unnecessary tissue removal, improves operational precision and efficiency, simplifies procedures, and reduces the number of tool changes.
Smart Images
Figure CN224269459U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a fixed-depth bur and a tooth grinding machine that adapts to the angle of the tooth surface. Background Technology
[0002] When preparing teeth for veneers, dentists need to perform precise depth preparation based on the specific condition of the patient's teeth to determine the amount of tooth structure to be removed, thus ensuring the success of subsequent treatment or polishing processes. The labial surface of anterior teeth is not flat but curved at an angle. However, the clinical morphology of the crown neck causes significant deviations in the mesiodistal width between the tooth neck and the body and incisal edge. Current conventional veneer depth preparation burs easily grind down the gums or leave unnecessary depth marks during neck preparation, thus affecting the final depth. Utility Model Content
[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a fixed-depth bur that adapts to the angle of the tooth surface.
[0004] To achieve the above objectives, the present invention provides the following technical solution:
[0005] A depth-adaptive bur for tooth surface angles includes a shank, one end of which is connected to a drive device for transmission, and the other end of which is provided with a ball drill. The shank is also provided with at least two equidistant disc drills along its axial direction, and the radial dimension of the two disc drills is greater than the radial dimension of the ball drill.
[0006] Furthermore, the radial dimensions of each of the said disc drills are equal, or the radial dimensions of each of the said disc drills decrease sequentially along the direction closer to the ball drill.
[0007] Furthermore, one end of the needle shank extends axially with a connecting portion, the top of which is connected to the ball drill.
[0008] Furthermore, the ball drill and the disc drill have a diamond surface covering the entire outer surface.
[0009] Furthermore, the outer diameter of the needle handle is not less than the maximum outer diameter of the connecting portion.
[0010] Furthermore, the outer diameter of the connecting part gradually decreases from the disc drill towards the ball drill.
[0011] Furthermore, the outer sidewall of each of the said cog drills is arranged parallel to the central axis of the needle shank, and the difference in outer diameter between adjacent cog drills is 0.4 mm.
[0012] A dental grinding machine includes a fixed-depth bur that adapts to the angle of the tooth surface as described above, and also includes the drive device, the output end of which is connected to the bur shank.
[0013] The beneficial effects of this utility model are:
[0014] 1. This utility model proposes a depth-fixing bur adapted to tooth surface angles, comprising a shank, one end of which can be connected to a drive device for transmission, and the other end of which is provided with a ball drill. The shank also has at least two equally spaced disc drills along its axial direction, and the radial dimensions of the two disc drills are larger than the radial dimensions of the ball drill. The ball drill is used for depth-fixing at the cervical region of the tooth, while the disc drill is used for depth-fixing at the body and incisal edge of the tooth. The ball drill and disc drill can perform depth-fixing grinding on different parts of the tooth structure. When fixing the depth for veneers, segmented grinding can avoid unnecessary tooth tissue removal caused by grinding the cervical region and body, or the body and incisal edge. Moreover, the depth-fixing at the cervical region is completed by the ball drill, which reduces the risk of accidentally damaging the gingiva near the cervical region of the tooth.
[0015] 2. This utility model proposes a fixed-depth bur that adapts to tooth surface angles. Each bur disc can be designed for equal depth, meaning the radial dimensions of each disc are equal. This ensures that each disc has the same grinding depth at different positions, guaranteeing a consistent grinding depth throughout the preparation area. This reduces the need for repeated depth adjustments by the dentist during preparation, making the operation simpler and faster. Alternatively, each bur disc can be designed for gradient depth, with the radial dimensions decreasing sequentially towards the ball bur. This allows different parts of each disc to have different grinding depths at different positions. The dentist can select the appropriate grinding depth according to different parts of the tooth, avoiding over-grinding that could expose the pulp. Furthermore, the dentist can complete grinding to different depths in a single operation, reducing the number of bur changes.
[0016] 3. The present invention proposes a depth-adaptive bur that adapts to the angle of the tooth surface. A connecting part is provided between the bur handle and the ball drill. The outer diameter of the connecting part is smaller than the maximum outer diameter of the bur handle to facilitate the processing of the ball drill. Furthermore, the outer diameter of the connecting part gradually decreases along its direction closer to the ball drill, helping doctors to more accurately control the grinding depth during operation.
[0017] 4. The present invention proposes a depth-fixing bur that adapts to the tooth surface angle. The outer side wall of each bur is set parallel to the central axis of the bur handle. The width of the depth-fixing groove does not change with the depth of the depth-fixing groove, making it more stable during operation. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of a depth-adaptive bur for tooth surface angle according to the present invention;
[0020] Figure 2 This is a front view of a depth-adapting bur for tooth surface angle according to the present invention;
[0021] Figure 3 This is one of the schematic diagrams illustrating the use of a fixed-depth bur adapted to tooth surface angle according to this utility model;
[0022] Figure 4 This is one of the schematic diagrams showing the effect of using a fixed-depth bur that adapts to the tooth surface angle according to this utility model;
[0023] Figure 5 This is the second schematic diagram illustrating the usage process of a fixed-depth bur that adapts to the tooth surface angle according to this utility model.
[0024] Figure 6 This is the second schematic diagram showing the effect of using a fixed-depth bur that adapts to the tooth surface angle according to this utility model;
[0025] In the diagram, 10 is the needle handle; 20 is the ball drill; 30 is the disc drill; 301 is the first disc drill; 302 is the second disc drill; 40 is the connecting part; 50 is the tooth; 60 is the gingiva; 70 is the first fixed-depth groove; and 80 is the second fixed-depth groove. Detailed Implementation
[0026] Example 1
[0027] The following is combined Figures 1 to 6 This embodiment will be described in detail.
[0028] This embodiment provides a depth-adaptive bur that can be adjusted to the angle of the tooth surface, such as... Figure 1 and Figure 2As shown, the device includes a needle shank 10, one end of which is connected to a drive device for transmission, and the other end is equipped with a ball drill 20. The needle shank 10 also has at least two equally spaced disc drills 30 along its axial direction, and the radial dimension of the two disc drills 30 is larger than the radial dimension of the ball drill 20. The ball drill 20 is used to determine the depth at the neck of the tooth 50, while the disc drills 30 are used to determine the depth at the body and incisal edge of the tooth 50. Because the neck, body, and incisal edge of the tooth 50 have different widths, with the neck being narrower, using the disc drill 30 to grind the neck and body, or the body and incisal edge, can easily lead to unnecessary removal of tooth 50 tissue. Furthermore, the neck of the tooth 50 is close to the gingiva 60, and the disc drill 30 can easily injure the gingiva 60 near the neck of the tooth 50 during sliding. Therefore, the combination of the ball drill 20 and the disc drill 30 is used to perform targeted depth grinding on different parts of the tooth tissue, and segmented grinding is used to better adapt to the tooth surface.
[0029] In this embodiment, as shown in the figure, the radial dimension of each disc drill 30 decreases sequentially along the direction approaching the ball drill 20. In some embodiments, the radial dimensions of each disc drill 30 are equal.
[0030] In this embodiment, the outer walls of each disc drill 30 are arranged parallel to the central axis of the needle shank 10, ensuring that the width of the depth groove does not change with the depth of the depth groove, and the obtained depth groove always maintains the same width, reducing errors. In some embodiments, the disc drill 30 can be wheel-shaped, that is, the outer surface of the contact surface with the tooth 50 is curved, minimizing unnecessary removal of tooth tissue. In this case, only the contact surface is curved, which does not affect the width of the depth groove. Preferably, the difference in outer diameter between adjacent disc drills 30 is 0.4 mm, so that the two disc drills 30 can better fit the tooth surface. In other embodiments, the radial dimensions of the ball drill 20 and each disc drill 30 can be set according to the actual depth requirements.
[0031] In this embodiment, the needle shank 10 is sequentially provided with a first disc drill 301 and a second disc drill 302 along the direction close to the ball drill 20. The outer diameter of the second disc drill 302 is larger than that of the first disc drill 301. The diameter of the ball drill 20 is set to 0.6 mm, and the fixed depths of the first disc drill 301 and the second disc drill 302 are 0.5 mm and 0.7 mm, respectively. During depth setting, firstly, using a method perpendicular to the tooth surface, the ball drill 20 drills halfway in, leaving a fixed depth hole of 0.3 mm. The ball drill 20 is then controlled to move at the neck of the tooth 50 to obtain a first fixed depth groove 70 composed of several fixed depth holes, thus completing the neck depth setting. Then, using a method parallel to the tooth surface, the first disc drill 301 and the second disc drill 302 simultaneously fit onto the corresponding body and incisal edge positions on the tooth surface. The first disc drill 301 and the second disc drill 302 are then controlled to move and grind to obtain two second fixed depth grooves 80 with depths of 0.5 mm and 0.7 mm, thus completing the depth setting in sections.
[0032] In this embodiment, a connecting portion 40 extends axially from one end of the needle shank 10, and the top of the connecting portion 40 is connected to the ball drill 20. Both the ball drill 20 and the disc drill 30 have a diamond-coated surface covering their entire outer surface, making the depth-setting process more efficient and reducing operation time and tool change frequency. The outer diameter of the needle shank 10 is not less than the maximum outer diameter of the connecting portion 40, and the outer diameter of the connecting portion 40 gradually decreases from the disc drill 30 towards the ball drill 20, facilitating sandblasting of the ball drill 20 and the disc drill 30.
[0033] The working principle of the fixed-depth bur adapted to tooth surface angle proposed in this utility model is as follows:
[0034] First, determine the depth at the cervical region of the tooth, such as... Figure 3 As shown, the bur 10 is held perpendicular to the tooth surface, and the ball drill 20 on its end face is used to grind the cervical region of the tooth surface to a fixed depth. Each grinding operation by the ball drill 20 leaves a spherical fixed-depth hole on the tooth surface. By moving the fixed-depth bur along the horizontal plane of the tooth 50 and repeating the fixed-depth process, a first fixed-depth groove 70 composed of several fixed-depth holes can be obtained. After the cervical region of the tooth surface is fixed in depth, as shown... Figure 4 As shown, all the fixed-depth holes are located on the same horizontal line.
[0035] Then determine the depth of the tooth body and incisal edge at position 50, such as... Figure 5 As shown, the needle handle 10 is moved until the first and second disc drills 301 and 302 correspond to the body and incisal edge of the opposing tooth surface, respectively. Moving the needle handle 10 horizontally, as shown in the figure, the first and second disc drills 301 and 302 will leave two horizontal second-depth grooves 80 on the tooth surface. Figure 6 As shown, the first fixed-depth groove 70 and the second fixed-depth groove 80 are parallel to each other and extend across the entire tooth surface to ensure sufficient preparation for the entire tooth surface.
[0036] Example 2
[0037] This embodiment provides a dental grinding machine, including a depth-adapting bur as described above, and a drive device. The output end of the drive device is connected to the bur shank 10. Specifically, the drive device is a high-speed turbine, and its output end is provided with a rotating shaft, which is connected to the bur shank 10. By controlling the operation of the high-speed turbine, segmented depth grinding of the ball drill 20 and the disc drill 30 can be achieved.
[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A depth setting wheel pin adapted to accommodate the angle of a dental surface, characterized in that, The device includes a needle handle, one end of which can be connected to a drive device for transmission, and the other end is provided with a ball drill. The needle handle is also provided with at least two equidistant disc drills along its axial direction, and the radial dimension of the two disc drills is greater than the radial dimension of the ball drill.
2. A depth setting bit adapted to the angle of the tooth surface according to claim 1, characterized in that The radial dimensions of each of the said disc drills are equal, or the radial dimensions of each of the said disc drills decrease sequentially along the direction closer to the ball drill.
3. A depth-adaptive bur for tooth surface angles as described in claim 2, characterized in that, One end of the needle shank extends axially with a connecting portion, the top of which is connected to the ball drill.
4. A depth-adaptive bur for tooth surface angles as described in claim 3, characterized in that, The ball drill and the disc drill have a diamond surface covering the entire outer surface.
5. A depth-adaptive bur for tooth surface angles as described in claim 4, characterized in that, The outer diameter of the needle handle is not less than the maximum outer diameter of the connecting part.
6. A depth-adaptive bur for tooth surface angles as described in claim 4, characterized in that, The outer diameter of the connecting part gradually decreases from the disc drill towards the ball drill.
7. A depth-adaptive bur for tooth surface angles as described in claim 5 or 6, characterized in that, The outer sidewall of each of the said cog drills is arranged parallel to the central axis of the needle shank, and the difference between the outer diameter of adjacent cog drills is 0.4 mm.
8. A dental grinding machine, characterized in that, The device includes a fixed-depth bur that adapts to the tooth surface angle as described in any one of claims 1-7, and also includes the driving device, the output end of which is connected to the bur shank in a driving connection.