Torsion resistance testing tool for trephine
By designing a test fixture for the torsional performance of dental trephine drills, and using protruding teeth and fixing holes to fix the dental trephine drills, the problem of fixing dental trephine drills during torsional performance testing was solved, ensuring the accuracy and safety of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MEDICAL DEVICE QUALITY SUPERVISION & INSPECTION INST
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-28
AI Technical Summary
Dental trephine drills are difficult to fix during torsional performance testing, affecting the accuracy and safety of the test results.
A test fixture for the torsional performance of dental trephine was designed, including a cutting end fixing device and a rod fixing device. The toothed working part and rod of the dental trephine are fixed by the protruding teeth and fixing holes, and connected to a torque testing machine through a clamping part to realize the torsional performance test of the dental trephine.
This method achieves stable fixation of dental trephine drills in torsional performance testing, ensuring the accuracy and safety of test results and avoiding test errors and potential safety risks caused by insecure fixation.
Smart Images
Figure CN224176299U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dental instrument technology, and more specifically, to a testing fixture for the torsional performance of a trephine. Background Technology
[0002] A dental trephine is an instrument specifically designed for dental implant surgery and has important applications in the field of dentistry. It is typically used to remove small amounts of bone tissue to create a suitable bone bed for the dental implant. It is also used to remove already implanted implants. Dental trephines are designed and manufactured according to strict standards to ensure their performance and safety during surgery. These standards include material selection, hardness testing, dimensional accuracy, and the accuracy of marking lines, ensuring that the trephine achieves optimal results in dental implant surgery.
[0003] Dental trephine drills are subjected to a certain amount of torque during use, and different surgical procedures have different requirements for their torsional resistance. For example, in some complex dental implant surgeries, the trephine needs to withstand greater torque to complete the drilling operation. If the trephine's torsional resistance is insufficient, it will not meet the requirements of the surgery, affecting the smooth progress of the surgery and the treatment effect, and may even break during the operation, causing serious harm to the patient. Therefore, torsional resistance is an important indicator for evaluating the quality of dental trephine drills. Torsional resistance testing is necessary to screen out trephine drills that meet the requirements, thereby ensuring safety in clinical use. However, dental trephine drills have cylindrical ends and toothed working ends, making it difficult to fix them in place during torsional resistance testing. Utility Model Content
[0004] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide a trephine anti-torsion performance testing fixture to solve the problem of difficulty in fixing dental trephines during anti-torsion performance testing.
[0005] The technical solution adopted by this utility model is a test fixture for the torsional performance of a trephine, including a cutting edge fixing device and a rod fixing device. One end of the cutting edge fixing device is provided with a first clamping part, and the other end is provided with a protruding tooth. One end of the rod fixing device is provided with a second clamping part, and the other end is provided with a fixing hole.
[0006] A dental trephine typically comprises a toothed working part, an operating part, and a shaft. This fixture is used to hold the dental trephine during torsion testing. In use, the protruding teeth secure the toothed working part of the trephine, the fixing holes of the shaft fixing device secure the shaft, and the first and second clamping parts are used for clamping by a torsion testing machine. After clamping, one of the first and second clamping parts is fixed, and a force is applied to the other, causing the first and second clamping parts to rotate relative to each other. This rotation of the toothed working part of the dental trephine relative to the shaft allows for testing the torsion resistance of the dental trephine.
[0007] Furthermore, both the first clamping part and the second clamping part are cylindrical, with one end connected to the blade end fixing device and the rod fixing device respectively, and the other end is provided with multiple slots, which are evenly distributed around the axis of the cylinder.
[0008] The first and second clamping parts are cylindrical, and multiple latches are provided at one end to match the clamping components of the torque testing machine. The multiple latches can make the clamping components clamp more firmly and prevent the first and second clamping parts from rotating relative to the clamping components of the torque testing machine.
[0009] Furthermore, the bayonet extends along the length of the first clamping part and the second clamping part, and the extension depth is not less than 5mm.
[0010] If the depth of the jaw is too small, the clamping parts of the torque testing machine will not hold enough, resulting in an unstable clamping.
[0011] Furthermore, the protruding teeth are inclined to one side.
[0012] The protruding teeth are used to fix the toothed working part of the dental trephine, so that when the first clamping part is subjected to force and rotates, it can drive the dental trephine to rotate as well. The teeth on the dental trephine are usually tilted to one side, so the protruding teeth need to be tilted in the opposite direction to fix the toothed working part of the dental trephine more firmly.
[0013] Furthermore, the protrusion height of the convex tooth is 1.2 to 2.5 mm.
[0014] The length of the teeth in the working part of a dental trephine is usually about 1 to 2 mm. The height of the protruding teeth needs to be slightly longer than the length of the teeth to make them more secure and to prevent the tooth tips from being damaged under force.
[0015] Furthermore, there are two protruding teeth, which are perpendicular to each other, and the intersection of the two protruding teeth is on the central axis of the first clamping part.
[0016] The more protruding teeth a dental trephine has, the more securely it is fixed, the less stress is placed on each individual tooth, and the less prone it is to damage. However, there are currently no specific regulations regarding the number of teeth on a dental trephine. If too many protruding teeth are used, they may not be compatible with the tooth structure of the trephine, rendering it unusable. Therefore, using two mutually perpendicular protruding teeth is suitable for most dental trephines, while avoiding insecure fixation or excessive stress on individual teeth due to too few engaging teeth. Furthermore, during testing, the axes of the cutting edge fixing device, the dental trephine, and the shank fixing device must be aligned to ensure accurate test results. Setting the intersection of the two protruding teeth on the central axis of the cutting edge fixing device ensures that the central axis of the dental trephine and the first clamping part are aligned.
[0017] Furthermore, the distance between the two ends of the protruding tooth and the intersection point is 2 to 15 mm.
[0018] The diameter of the toothed working part of a dental trephine is usually 2 to 16 mm. The distance between the two ends of the protruding tooth and the intersection point needs to be greater than the radius of the toothed working part of the dental trephine to avoid the protruding tooth failing to lock the teeth of the dental trephine.
[0019] Furthermore, the cross-section of the fixing hole is arc-shaped, and the center of the circle corresponding to the arc is on the central axis of the second clamping part.
[0020] The free end of a dental trephine shaft typically has a flat section for securing it to the dental drill handpiece, preventing insecure fixing of the round shaft. The flat section has an arc-shaped cross-section; therefore, setting the cross-section of the fixing hole to an arc shape to match the flat section of the dental trephine shaft ensures a more secure fixation. When using this fixture, the first clamping part, the second clamping part, and the central axis of the dental trephine should all be collinear. Setting the center of the circle corresponding to the arc shape on the central axis of the second clamping part ensures that the dental trephine and the central axis of the second clamping part are collinear.
[0021] Furthermore, the depth of the fixing hole is 2.5–3.0 mm.
[0022] The length of the flat section of a dental trephine is typically 2.4–2.7 mm, and the depth of the fixing hole only needs to be slightly longer than the length of the flat section. However, the depth of the fixing hole should not be too short; if it is too short, the dental trephine may come out of the fixing hole under force.
[0023] Furthermore, the diameter of the circle corresponding to the bow shape is 2.30 to 2.35 mm.
[0024] The fixing hole must match the flat section of the dental trephine shaft, which typically has a diameter of 2.30–2.35 mm. The diameter of the arc corresponding to the cross-section of the flat section is also 2.30–2.35 mm. Therefore, the diameter of the fixing hole should be the same to ensure a more secure fixation.
[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses protruding teeth on the cutting edge fixing device to fix the toothed working part of the dental trephine, and fixing holes on the rod fixing device to fix the rod of the dental trephine. A first clamping part and a second clamping part are respectively provided on the cutting edge fixing device and the rod fixing device for clamping by a torque testing machine. This allows the toothed working part of the dental trephine to rotate relative to the rod when the torque testing machine applies torque to the first or second clamping part, thus enabling torsional performance testing. Both the first and second clamping parts are cylindrical, with multiple latches extending a certain depth along the length of the first and second clamping parts, thus allowing for a more secure clamping by the torque testing machine. The protruding teeth on the cutting edge fixing device are inclined to one side, and the inclination direction is opposite to the inclination direction of the teeth on the dental trephine. Their protrusion height is slightly longer than the length of the teeth, allowing for better fixation of the toothed working part of the dental trephine. The fixing hole on the rod fixing device is used to insert the rod of a dental trephine. The shape of the fixing hole is the same as the shape of the flat part of the free end of the rod, both being arc-shaped, and the fixing hole has a certain depth to prevent the rod from coming out of the fixing hole. When using this fixture, the center of the toothed working part of the dental trephine coincides with the intersection point of the protruding teeth on the cutting end fixing device, the central axis of the flat part of the rod coincides with the central axis of the fixing hole, the intersection point of the protruding teeth is set on the central axis of the first clamping part, and the center of the circle containing the cross-section of the fixing hole is set on the central axis of the second clamping part. This ensures that the first clamping part, the second clamping part, and the central axis of the dental trephine are all on the same straight line during testing, making the test results more accurate. Attached Figure Description
[0026] Figure 1 This is a structural diagram of the present invention.
[0027] Figure 2 This is a structural diagram of the blade tip fixing device.
[0028] Figure 3 This is a left view of the blade tip fixing device.
[0029] Figure 4 This is a structural diagram of the rod fixing device.
[0030] Figure 5 This is a left view of the rod fixing device.
[0031] Figure 6 This is a rear view of the rod fixing device.
[0032] Figure 7 This is a structural diagram of a dental trephine. Detailed Implementation
[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0034] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, in the description of this application, in order to distinguish different units, the terms "first," "second," etc. are used in this specification, but these are not limited by the manufacturing order, nor should they be construed as indicating or implying relative importance.
[0035] like Figure 1 As shown, a dental trephine torsional resistance testing fixture includes a cutting edge fixing device 1 and a rod fixing device 2. Both the cutting edge fixing device 1 and the rod fixing device 2 are cylindrical, with a first clamping part 3 and a second clamping part 4 respectively provided at one end for clamping by a torsion testing machine. The first clamping part 3 and the second clamping part 4 are also cylindrical and coaxial with the cutting edge fixing device 1 and the rod fixing device 2, respectively. One end of the first clamping part 3 and the second clamping part 4 are connected to the cutting edge fixing device 1 and the rod fixing device 2, respectively, and the other end is provided with three slots 31. The slots 31 are evenly distributed on the circumference with the axis of the first clamping part 3 and the second clamping part 4 as the center, and the slots 31 extend to a certain depth D along the length direction of the first clamping part 3 and the second clamping part 4. Preferably, the depth D is not less than 5 mm.
[0036] like Figure 2 , Figure 3 As shown, one end of the cutting edge fixing device 1 is connected to the first clamping part 3, and the other end is provided with protruding teeth 11. There are two teeth 11, which are perpendicular to each other, and the intersection of the two teeth 11 is on the central axis of the cutting edge fixing device 1. Further, the length L from the two ends of the teeth 11 to the intersection point is 2-15mm. The protrusion height H of the teeth 11 is 1.2-2.5mm. Both teeth 11 are inclined to the same side, and the inclination direction must be opposite to the direction of the dental trephine teeth.
[0037] like Figures 4-6 As shown, one end of the rod fixing device 2 is connected to the second clamping part 4, and the other end is provided with a fixing hole 21. The cross-section of the fixing hole 21 is arc-shaped, and the center point of the arc is on the central axis of the rod fixing device 2. The diameter D of the arc is 2.30-2.35 mm, and the angle α of the arc is 200-270 degrees. The depth H2 of the arc-shaped fixing hole is 2.5-3.0 mm.
[0038] like Figure 7 As shown, the dental trephine 5 includes a toothed working part 51, an operating part 52, and a shaft part 53, wherein the free end of the shaft part is provided with a flat part 54 for connecting to the trephine handpiece.
[0039] like Figure 1 As shown, when using this tooling, the teeth of the dental trephine 5 are clamped onto the protruding teeth 11 of the cutting edge fixing device 1, and the flat portion 54 of the free end of the rod 53 is inserted into the fixing hole 21 of the rod fixing device 2. The clamping components of the torque testing machine clamp the first clamping portion 3 and the second clamping portion 4 respectively, fixing one of the first clamping portion 3 and the second clamping portion 4, and applying force to the other, causing the first clamping portion 3 to rotate relative to the second clamping portion 4, thereby causing the toothed working part 51 of the dental trephine 5 to twist relative to the rod 53.
[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A testing fixture for the torsional resistance of a piercing drill, characterized in that, It includes a cutting edge fixing device and a rod fixing device. One end of the cutting edge fixing device is provided with a first clamping part, and the other end is provided with a protruding tooth. One end of the rod fixing device is provided with a second clamping part, and the other end is provided with a fixing hole.
2. The torsional resistance testing fixture for a piercing drill according to claim 1, characterized in that, Both the first clamping part and the second clamping part are cylindrical, with one end connected to the blade end fixing device and the rod fixing device respectively, and the other end is provided with multiple slots, which are evenly distributed around the axis of the cylinder.
3. The torsional resistance testing fixture for a piercing drill according to claim 2, characterized in that, The bayonet extends along the length of the first clamping part and the second clamping part, and the extension depth is not less than 5mm.
4. A testing fixture for the torsional resistance of a piercing drill according to any one of claims 1 to 3, characterized in that, The protruding teeth are inclined to one side.
5. The torsional resistance testing fixture for a piercing drill according to claim 4, characterized in that, The protrusion height of the convex tooth is 1.2 to 2.5 mm.
6. The torsional resistance testing fixture for a piercing drill according to claim 4, characterized in that, The device has two protruding teeth, which are perpendicular to each other, and the intersection of the two protruding teeth is on the central axis of the first clamping part.
7. The torsional resistance testing fixture for a piercing drill according to claim 6, characterized in that, The distance between the two ends of the protruding tooth and the intersection point is 2 to 15 mm.
8. The torsional resistance testing fixture for a piercing drill according to claim 4, characterized in that, The cross-section of the fixing hole is arc-shaped, and the center of the circle corresponding to the arc is on the central axis of the second clamping part.
9. The torsional resistance testing fixture for a piercing drill according to claim 8, characterized in that, The depth of the fixing hole is 2.4 to 2.7 mm.
10. The torsional resistance testing fixture for a piercing drill according to claim 8, characterized in that, The diameter of the circle corresponding to the bow shape is 2.30 to 2.35 mm.