一种咬合面辅助钉洞固位型牙体预备车针组件
By designing an occlusal surface-assisted cavity retention tooth preparation bur assembly, and utilizing a combination of a conical bur and a brake ring, the problems of uniform preparation depth and axial parallelism of dental burs were solved. This achieved precise depth setting and parallelism of multiple retention types, improving the retention force of restorations and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN UNIV
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-17
AI Technical Summary
Existing dental burs have difficulty controlling the uniformity of preparation depth and the parallelism of multiple retention axes, which increases the difficulty of clinical operation, especially when the clinical height of the abutment tooth is less than the threshold or the enamel is damaged, resulting in insufficient retention of the restoration.
Design a tooth preparation bur assembly with occlusal surface-assisted post-hole retention, including multiple burs and a brake ring. The working part of the bur is set as a conical surface with gradually increasing axial length. The brake ring is vertically fitted to limit the movement, ensuring uniform depth and axial parallelism.
It achieves precise depth determination of the occlusal surface and axial parallelism of multiple retention types, simplifying clinical procedures and improving the retention and stability of the prosthesis.
Smart Images
Figure CN224505610U_ABST
Abstract
Claims
1. An occlusal pinhole retention type tooth preparation pin assembly for assisting a pinhole, characterized in that, include: Multiple needles (10) are cylindrical, with a gripping part and a working part (101) at both ends. The sidewall of the working part (101) is set as a conical surface so that the radial dimension of the working part (101) gradually decreases in the direction away from the gripping part, and the axial length of the working part (101) of all the needles (10) gradually increases. Multiple brake rings (20), each of the needles (10) corresponds to at least one brake ring (20), the brake rings (20) are vertically and coaxially fixedly fitted outside the corresponding needles (10), and the side of the brake ring (20) facing the working part (101) is flush with the tail end of the working part (101).
2. The pinhole preparation bur assembly according to claim 1, wherein The tip of the working part (101) is configured as a smoothly transitioned arc surface.
3. The pinhole preparation bur assembly according to claim 1, wherein All the needles (10) include multiple pre-stitch needles (11) and one depth needle (12). The axial lengths of the working parts (101) of all the prepared needles (11) are in an arithmetic sequence; The working part (101) of the depth-fixing needle (12) is provided with scale lines (121) along the axial direction.
4. The pinhole preparation bur assembly according to claim 3, wherein The working part (101) of the pre-stitch needle (11) has a taper of 5° and the tip diameter of the working part (101) is 1 mm.
5. The occlusal stent pinhole-retention type tooth preparation bur set according to claim 4, wherein The axial length of the pre-stitch needle (11) is 19mm. All the pre-stitch needles (11) include 4 needles. The axial lengths of the working parts (101) of the 4 pre-stitch needles (11) are 1mm, 1.5mm, 2mm and 2.5mm respectively.
6. The pinhole preparation bur assembly according to claim 5, wherein The surface particle size of the working part (101) of the pre-cut needle (11) is 106-125 μm.
7. The pinhole preparation bur assembly according to claim 6, wherein The working part (101) of the pre-cutting needle (11) has a conical cutting bevel (111) with a slope of 45° on the side wall of the root of the tail end.
8. The occlusal stent pinhole-retention type tooth preparation bur set according to any one of claims 3 to 7, wherein The outer diameter of the brake ring (20) corresponding to the pre-stitch needle (11) is 2 mm.
9. The pinhole preparation bur assembly of claim 3, wherein, The working part (101) of the fixed depth needle (12) has an axial length of 6 mm, and the minimum diameter and maximum diameter of the working part (101) are 1 mm and 2 mm, respectively.
10. The pinhole preparation bur assembly according to claim 9, wherein, The fixed-depth needle (12) corresponds to three brake rings (20). The three brake rings (20) are detachably fitted with the fixed-depth needle (12). The outer diameters of the three brake rings (20) are 6mm, 8mm and 10mm respectively, and the thickness of the brake ring (20) is 3mm. A rubber ring (122) is coaxially fitted between the inner wall of the brake ring (20) corresponding to the fixed depth needle (12) and the outer wall of the fixed depth needle (12). The inner diameter of the rubber ring (122) is 1 mm and the outer diameter is 2 mm.