Hard alloy dental drill
By designing large diameter and high angle carbide drills, the problem of limited cutting range caused by the small diameter of the cutting edge part of the tooth drill is solved, and more efficient tooth crushing and debris treatment is achieved.
Patent Information
- Application Number
- CN202420739269.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The cutting edge part of the existing tooth drill has a small diameter, resulting in limited effect of vertical cutting to a large range, and it is impossible to effectively crush the third molar germ. It is easy to retain large tooth fragments during the cutting process, which requires additional cutting and extraction operations.
A carbide tooth drill is designed with a maximum diameter of at least 4mm, a rear angle of the end blade and peripheral blade is at least 20°, and multiple chip breakers are provided on the peripheral blade to improve sharpness and cutting efficiency. The chip breaking position is staggered to increase the horizontal cutting speed and the strength of the blade is increased by using cemented carbide.
The vertical cutting range is increased, the sharpness and strength of the blade is improved, the cutting speed and efficiency are improved, the debris size is reduced, and the fine particles of the teeth are crushed and discharged.
Smart Images
Figure CN222172294U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dental drills, in particular to a hard alloy dental drill. Background Art
[0002] The turbine handpiece is an instrument used in minimally invasive tooth extraction surgery. Its main function is to drive the dental drill to rotate and act as a cutting tool to cut the teeth into multiple small pieces to remove resistance and facilitate extraction. The fundamental limitation of minimally invasive tooth extraction instruments at present is that the cutting edge of the dental drill has a small diameter of about 1 to 2 mm, which means that they only have the functions of horizontal cutting and vertical drilling into a small range. The vertical large-scale cutting function is limited, and it is impossible to crush the third molar tooth germ in large pieces. Large tooth fragments will remain, and a large range of jawbone cutting is still required to remove resistance. It also needs to be combined with other tooth extraction instruments for extraction. Utility Model Content
[0003] Aiming at the problem that the cutting edge of the dental drill in the prior art has a small diameter, which results in limited vertical large-scale cutting effect, the utility model provides a cemented carbide dental drill.
[0004] The utility model provides the following technical solution: a cemented carbide dental drill, comprising a blade portion, one end of the blade portion is provided with an end blade, a side surface of the blade portion is provided with a plurality of circumferential blades extending spirally in the axial direction of the blade portion, a chip removal groove is provided between adjacent two peripheral blades, and the peripheral blade is provided with a plurality of chip breaking grooves in sequence along the axial direction of the blade portion; the maximum diameter of the blade portion is at least 4 mm, the end blade back angle is at least 20°, and the circumferential blade method back angle is at least 20°.
[0005] Preferably, the end edge back angle is 20°.
[0006] Preferably, the distance between two adjacent chip breaker grooves on the same peripheral edge is 0.7 mm, and the depth of the chip breaker groove is 0.3 mm.
[0007] Preferably, the chip breaking grooves on two adjacent peripheral edges are staggered in position.
[0008] Preferably, the number of the circumferential blades is 6.
[0009] Preferably, the helix angle of the circumferential blade is 30°, the tooth height of the circumferential blade is 0.8 mm, and the clearance angle of the circumferential blade is 20°.
[0010] Preferably, the maximum diameter of the blade is 4 mm, the length of the blade is 4 mm, the blade is further provided with a handle, and the total length of the blade and the handle is 22 mm.
[0011] The beneficial effects of the utility model are: increasing the maximum diameter of the blade to increase the vertical cutting range; increasing the end edge back angle and the peripheral edge back angle to improve the sharpness of the end edge and the peripheral edge, and using cemented carbide as the blade material to solve its strength problem; staggering the positions of the chip breaker grooves on adjacent peripheral edges to increase the cutting speed of the blade in horizontal cutting and further reduce the chip size. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a side view of an embodiment of the utility model.
[0013] Figure 2 Schematic diagram of the blade of an embodiment of the utility model.
[0014] Figure 3 It is a schematic cross-sectional view of an end blade of an embodiment of the utility model.
[0015] Figure 4 It is a schematic diagram of the cross section of the peripheral blade of an embodiment of the utility model.
[0016] Figure 5 It is a side view of another embodiment of the utility model.
[0017] Reference numerals: 10, cutting edge; 11, end edge; 12, peripheral edge; 13, chip groove; 14, chip breaker groove; 20, shank. DETAILED DESCRIPTION
[0018] The following is a more detailed description of the implementation of the utility model in conjunction with the drawings and the figure marks, so that those skilled in the art can implement it after reading this specification. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.
[0019] The utility model provides Figure 1-4 The hard alloy dental drill shown comprises a blade 10 for cutting teeth, one end of which is connected to a turbine handpiece via a handle 20. The dental drill is in the shape of a slender rod. In this embodiment, the length L1 of the blade 10 is 4 mm, and the total length L2 of the blade and the handle is 22 mm.
[0020] An end blade 11 is provided at the other end of the blade portion, and a plurality of circumferential blades 12 extending spirally in the axial direction of the blade portion are provided on the side of the blade portion 10. The two cooperate to achieve horizontal and vertical cutting of the teeth. The vertical cutting refers to the cutting direction being parallel to the central axis of the blade portion 10, and the horizontal cutting refers to the cutting direction being perpendicular to the central axis of the blade portion 10.
[0021] In this embodiment, the maximum diameter D of the blade 10 is 4 mm to increase the vertical cutting range of the dental drill; the number of peripheral blades 12 is 6, the helix angle β is 30°, and the clearance angle α isn1 is 20°; the back angle α2 of the end blade 11 is 20°. The values of the inclination angle of the blade 10, the normal rake angle of the peripheral blade 12, the rake angle of the end blade 11, and the main deflection angle of the end blade 11 can refer to the prior art. In other embodiments, the maximum diameter of the blade 10, the normal rake angle of the peripheral blade 12, and the back angle of the end blade 11 can be further increased as needed. The invention patent application with publication number CN115624399A discloses a high-speed mobile phone and a dental drill with a spray and suction function, the values of the normal rake angle of the peripheral blade and the back angle of the end blade of the dental drill are both small, both below 10°, in order to improve the strength of the blade, but it is found that its sharpness also decreases during use. Therefore, in the utility model, the normal rake angle of the peripheral blade 12 and the back angle of the end blade 11 are increased to 20° or above, effectively improving their sharpness, and cemented carbide is used as the blade material to solve its strength problem.
[0022] A chip removal groove 13 is provided between adjacent two edges 12 to discharge the debris generated during the cutting process and avoid accumulation. The size of the chip removal groove 13 is positively correlated with the tooth height of the peripheral edge 12. In this embodiment, the tooth height h of the peripheral edge 12 is 0.8 mm. The peripheral edge 12 is provided with a plurality of chip breaker grooves 14 in sequence along the axial direction of the blade, dividing the peripheral edge into multiple sections, which is conducive to crushing the teeth into fine particles for easy discharge. In this embodiment, please refer to Figure 1 The number of chip breaker grooves 14 on the multiple peripheral edges is the same and the positions are corresponding. Six chip breaker grooves 14 are arranged at the same distance L3 between the blade 10 and the shank 20. The spacing between two adjacent chip breaker grooves 14 on the same peripheral edge 12 is 0.7mm. Six chip breaker grooves are arranged at the distances L3-0.7mm, L3+0.7mm, L3+1.4mm, and L3+2.1mm between the blade and the shank. The depth of the chip breaker groove 14 is 0.3mm. In another embodiment, please refer to Figure 5 The chip breaker grooves 14 on two adjacent peripheral edges 12 are staggered, that is, at most one chip breaker groove 14 is provided at the same distance between the blade 10 and the shank 20, which helps to increase the cutting speed of the blade in horizontal cutting and further reduce the chip size.
[0023] The above are one or more embodiments of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A cemented carbide dental drill, characterized in that: It includes a blade portion, one end of which is provided with an end blade, a plurality of circumferential blades spirally extending in the axial direction of the blade portion are provided on the side of the blade portion, a chip groove is provided between adjacent two round blades, and a plurality of chip breaking grooves are sequentially provided on the circumferential blade along the axial direction of the blade portion; the maximum diameter of the blade portion is at least 4 mm, the end blade back angle is at least 20°, and the circumferential blade normal back angle is at least 20°.
2. A cemented carbide dental drill according to claim 1, characterized in that: The end blade back angle is 20°.
3. A cemented carbide dental drill according to claim 1, characterized in that: The distance between two adjacent chip breaker grooves on the same peripheral edge is 0.7 mm, and the depth of the chip breaker groove is 0.3 mm.
4. A cemented carbide dental drill according to claim 1, characterized in that: The chip breaking grooves on two adjacent peripheral edges are staggered in position.
5. The cemented carbide dental drill according to claim 1, characterized in that: The number of the circumferential blades is 6.
6. A cemented carbide dental drill according to claim 1, characterized in that: The helix angle of the circumferential blade is 30°, the tooth height of the circumferential blade is 0.8 mm, and the clearance angle of the circumferential blade is 20°.
7. The cemented carbide dental drill according to claim 1, characterized in that: The maximum diameter of the blade is 4 mm, the length of the blade is 4 mm, and the blade is also provided with a handle. The total length of the blade and the handle is 22 mm.