CN212415937U

CN212415937U - Dental drill component

Info

Publication number: CN212415937U
Application number: CN202020988635.8U
Authority: CN
Inventors: 李买生; 张潇; 陈贤帅
Original assignee: Foshan Angels Biotechnology Co ltd
Current assignee: Guangdong Zhongke Anchi Biotechnology Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-01-29
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses a dental drill subassembly, including dental drill and drill bushing, its dental drill includes cell-phone joint portion, drill bushing joint portion and the work portion that the axial connected gradually, be provided with two at least annular grooves of arranging in proper order on the drill bushing joint portion. The drill bushing is sleeved on the hollow sleeve on the dental drill bit and comprises a first end part, a positioning part and a second end part which are sequentially connected in the axial direction, the first end part is close to the mobile phone combining part, the second end part is close to the working part, at least one group of positioning assemblies matched with the annular grooves are arranged on the positioning part, and the positioning assemblies enable the drill bushing and the drill bushing combining part to be relatively fixed. The utility model discloses only need a dental drill and a drill bushing can regulate and control the drilling depth of difference. The utility model discloses a simple structure of drill bushing and drill bushing joint portion is convenient for produce, equipment and operation and is used, is favorable to extensive popularization and application of this dental drill subassembly.

Description

Dental drill component

Technical Field

The utility model relates to an oral planting technical field, in particular to dental drill subassembly.

Background

At present, in the process of dental implant operation, a doctor needs to drill a hole on an alveolar bone of a edentulous part for preparing a cavity for implanting, so that the dental implant can be conveniently implanted. For the special patient with descending maxillary sinus, maxillary sinus lifting is required to fill the bone graft material to prevent the dental implant from penetrating the wall of the maxillary sinus to ensure that the dental implant is located in the maxillary bone. Maxillary sinus lifting is essentially to peel off the mucosa of the maxillary sinus from the sinus floor and refill bone graft materials such as bone meal and the like, so as to avoid infection caused by the fact that dental implants penetrate the sinus wall. The inferior alveolar nerve is distributed in the mandible, and the sensory fibers of the inferior alveolar nerve are distributed on the skin and mucosa of the mandible, the gum, the chin and the lower lip, so that a safe distance of 2mm is reserved between the inferior alveolar nerve and the mandible when a cavity is prepared for planting the mandible. No matter the preparation of a lower jaw implant cavity or maxillary sinus lifting, doctors are required to accurately control the depth of drilling holes so as to avoid damaging lower alveolar nerves or penetrating maxillary sinus mucosa or maxillary sinus walls. Based on the above, some manufacturers produce a drill bushing, which is made of a metal material and has different heights, and the drill bushing is matched with a dental drill to control the drilling depth of different tooth implantation parts. However, different drill sleeves are required to be adopted for different drilling depths with the same diameter, so that the manufacturing cost is increased, the volume of the operation box is increased due to the large number of the drill sleeves, and a doctor or a nurse needs to select the drill sleeve with the proper height during an operation, so that the operation is not convenient for the doctor to use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the not enough of above-mentioned prior art, provide a dental drill subassembly, through the drill bit in this dental drill subassembly and supporting drill bushing, realized that the drilling depth that same diameter is different only need a drill bit and a drill bushing can to both can practice thrift the cost, can reduce the volume of dentistry tool holder again, be convenient for manage and make things convenient for the doctor to use.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a dental drill subassembly, includes dental drill and drill bushing, its dental drill includes cell-phone joint portion, drill bushing joint portion and the work portion that the axial connects gradually, be provided with two at least annular grooves of arranging in proper order on the drill bushing joint portion. The drill bushing is sleeved on the hollow sleeve on the dental drill bit and comprises a first end part, a positioning part and a second end part which are sequentially connected in the axial direction, the first end part is close to the mobile phone combining part, the second end part is close to the working part, at least one group of positioning assemblies matched with the annular grooves are arranged on the positioning part, and the positioning assemblies enable the drill bushing and the drill bushing combining part to be relatively fixed.

Specifically, the utility model discloses an at least two on the dental drill arrange the annular groove that sets up in proper order, utilize the locating component in the location portion of drill bushing to be fixed in certain annular groove with the drill bushing on, realized the regulation of the nevertheless different drilling depth of same drill bushing, through being fixed in different annular groove with the drill bushing promptly, can change the relative drill bushing of work portion among the dental drill and expose the degree of depth to the drilling depth of dental drill when control operation. When the second end of the drill bushing is abutted to the drilling object, the drill bushing prompts the operator to stop drilling.

Because the utility model provides a drill bushing establishes the piece for the cover, and it can follow the relative dentistry drill bit of axis and remove when not being fixed in on the drill bushing joint portion, consequently drops toward the cell-phone joint portion direction for the equipment mode of standardizing the drill bushing and further restriction drill bushing, can add the fender portion in the junction of cell-phone joint portion and drill bushing joint portion. The stop may further be provided as a raised ring having an outer diameter greater than an inner diameter of the first end of the drill sleeve.

And simultaneously, because the utility model provides a drill bushing is via in the actual operation in-process the drill bushing joint portion is gone into to the working part cover or is taken out from the drill bushing joint portion, consequently the utility model discloses in the minimum internal diameter of drill bushing can not be less than the biggest external diameter of working part in the dental drill bit, and also can not be less than the biggest external diameter of drill bushing joint portion.

In addition, for make in the actual operation between the positioning element on annular groove on the dental drill bit and the drill bushing fixed effect and take out the effect better, the annular groove is preferably equipped with the annular groove of chamfer on the axial both sides.

The utility model discloses thereby the principle of well regulation and control drilling depth is through making the second end that the drill bushing can be relative to the dental drill bit work portion expose different degree of depth on being located different annular groove with the drill bushing, consequently the utility model discloses in be used for realizing the key of regulation and control drilling depth with drill bushing and drill bushing joint relatively fixed locating component.

As the further improvement of the technical proposal, the positioning component of the utility model has a concrete structure comprising an arc-shaped slot and a boss. The arc-shaped open groove is arranged on the positioning part of the drill bushing and forms a spring plate structure, namely the formed spring plate structure is directly arranged on the side wall of the positioning part and is not an external part. The boss is arranged on the inner side of the elastic sheet structure relative to the drill bushing joint part, and the boss is connected with the annular groove in a buckling mode, so that the positioning assembly and the drill bushing joint part are relatively fixed. In particular, the number of such dome-type positioning elements is at least one. Considering the particularity of annular groove and shell fragment structure, especially the grooved setting of arc can destroy the overall stability of location portion, consequently for the good stability and the structure simplification nature of taking into account the drill bushing, the utility model discloses the preferred quantity of this kind of shell fragment-boss formula locating component is two to axial symmetry sets up. In addition, the preferred boss that is equipped with the fillet on the axial both sides of boss in the utility model discloses in this kind of boss be favorable to high efficiency ground card to go into annular groove is difficult for droing, is favorable to exerting oneself slightly again just can conveniently taking out to this kind of shell fragment-boss formula locating component's maneuverability has further been improved.

As above-mentioned technical scheme's further improvement, another kind of concrete structure of locating component is the spacing sleeve subassembly that includes vertical perpendicular to drill bushing joint portion and the holding chamber that is used for holding spacing sleeve subassembly, spacing sleeve subassembly with annular groove elasticity butt for locating component and drill bushing joint portion are relatively fixed. Specifically, since the positioning assembly of the spacing sleeve type does not destroy the overall stability of the positioning portion, the present invention preferably has one positioning assembly of the spacing sleeve type in view of the structural simplification of the positioning portion.

As a further improvement of the technical scheme, the outer side wall of the limiting sleeve component is in interference fit with the inner side wall of the accommodating cavity. Specifically, the limiting sleeve assembly can be embedded in the accommodating cavity in an embedding mode during injection molding.

As a further improvement of the technical scheme, the outer side wall of the limiting sleeve component is in threaded fit with the inner side wall of the accommodating cavity. Specifically, an external thread is arranged on the outer side wall of the limiting sleeve assembly, an internal thread is arranged on the inner side wall of the accommodating cavity, and the limiting sleeve assembly is detachable relative to the drill sleeve in a thread matching mode. The utility model discloses an improve this spacing sleeve subassembly's detachability, can one side that the drill bushing joint portion was kept away from to the spacing sleeve subassembly sets up the installation end, installs whole spacing sleeve subassembly through the screwdriver.

Obviously, the structure simplification of the locating component of the middle spring plate-boss type of the present invention is better than that of the locating component of the limiting sleeve type, but the stability and the durability of the locating component of the limiting sleeve type are better than those of the locating component of the spring plate-boss type. Considering that the dental drill component belongs to the oral cavity precision instrument, the utility model discloses preferred adoption spacing telescopic locating component.

As a further improvement of the technical scheme, the limiting sleeve assembly comprises a sleeve body, an elastic piece and a limiting bead. The sleeve body is provided with an open end, the limiting beads are arranged at the open end of the sleeve body, the elastic piece is embedded in the sleeve body, and the elastic piece is used for enabling the limiting beads to be elastically abutted to the annular groove. Specifically, the utility model provides an elastic component is the spring. Because spacing pearl is not immovable in the actual operation in-process, consequently the opening diameter of the open end of sleeve body will be less than the diameter of spacing pearl to make spacing pearl half embedding in the sleeve body.

The utility model discloses in, can be for non-equidistance or equidistance setting between two adjacent annular grooves arranged in proper order. However when two adjacent annular grooves that arrange in proper order set up for non-equidistance, probably still need be with the help of some scale marks in order accurately to control drilling depth in the actual operation in-process, consequently the utility model discloses a be favorable to further simplifying the convenience of use and improve drilling depth's accuracy, preferred be the equidistance sets up between two adjacent annular grooves that arrange in proper order on the drill bushing joint portion of dental drill bit, and the distance between two adjacent annular grooves of further preferred is 0.5 ~ 1mm, and it is favorable to drilling depth's accurate regulation and control.

As a further improvement of the above technical solution, at least one through hole is provided on the second end of the drill bushing. Specifically, the through holes function to improve the cooling efficiency of the cooling water to the dental drill bit.

As a further improvement of the technical scheme, the handpiece combination part of the dental drill is provided with an annular color ring. In particular, the annular color ring functions to facilitate differentiation of dental burs of different diameters.

As a further improvement of the above technical solution, the material of the drill bushing is selected from one of polyetheretherketone, polyphenylene sulfone resin, polyethersulfone resin, polycarbonate, medical stainless steel, and medical titanium alloy. Specifically, the materials have good comprehensive properties, such as wear resistance, high temperature resistance, no toxicity and the like. The utility model discloses preferred polyether ether ketone is as the material of drill bushing, and it has good toughness, rigidity, mechanical strength, wearability, high temperature resistance, hydrolysis resistance, radiation resistance and nontoxic concurrently, and can realize that the mass is high-efficient, low-cost production through the mould is moulded plastics, is favorable to the popularization and the application of this drill bushing.

The utility model discloses a cell-phone joint portion and work portion on the dental drill all adopt the conventional technology in this field, if the structure of cell-phone joint portion for satisfying national standard belongs to the general piece of connecting dental handpiece, and the structure of work portion for taking cutting groove and cutting chisel edge commonly used for realize the drilling in order to form drilling to the operation object.

The utility model has the advantages that:

the utility model discloses a special drill bushing institutional advancement, adaptation have two at least annular groove's of arranging in proper order dental drill, utilize drill bushing and drill bushing joint portion relative fixed locating position's difference, realize only needing a dental drill and a drill bushing to regulate and control the drilling depth of difference.

The utility model discloses a simple structure of drill bushing and drill bushing joint portion is convenient for produce, equipment and operation and is used, is favorable to extensive popularization and application of this dental drill subassembly.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a dental drill according to embodiments 1 to 3 of the present invention;

fig. 2 is a schematic structural view of a dental drill assembly according to embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a drill bushing in embodiment 1 of the present invention;

FIG. 4 is a cross-sectional view of a positioning portion of a drill bushing in embodiment 1 of the present invention;

FIG. 5 is a schematic view of the cross-sectional structure A-A of FIG. 2 according to the present invention;

FIG. 6 is an enlarged schematic view of a in FIG. 5 according to the present invention;

fig. 7 is a schematic structural view of the dental drill assembly according to

embodiments

2 and 3 of the present invention;

fig. 8 is a schematic structural view of a section B-B of fig. 7 according to embodiment 2 of the present invention;

fig. 9 is an enlarged schematic view of b in fig. 8 according to the present invention;

fig. 10 is a schematic structural view of a section B-B of fig. 7 according to embodiment 3 of the present invention;

fig. 11 is an enlarged schematic view of c in fig. 10 according to the present invention;

the mobile phone comprises a mobile phone combining part 1, a drill bushing combining part 2, a working part 3, a blocking part 4, a first end part 5, a positioning part 6, a second end part 7, an annular color ring 11, an annular groove 211, a chamfer 2111, an arc-shaped groove 61, a boss 62, a spring sheet structure 63, a limiting sleeve assembly 64, an accommodating cavity 65, a round angle 621, a sleeve body 641, an elastic piece 642, a limiting bead 643, an open end 6411 and an installation end 6412.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Example 1

Referring to fig. 1-6, a dental drill assembly comprises a dental drill and a drill bushing, wherein the dental drill comprises a handpiece combination 1, a drill bushing combination part 2, a working part 3 and a blocking part 4 which are sequentially connected in the axial direction.

At least two annular grooves 211 which are arranged in sequence are arranged on the drill bushing joint part 2. The blocking part is arranged at the joint of the mobile phone combining part 1 and the drill bushing combining part 2.

The drill bushing is established for the cover cavity sleeve on the dental drill bit, first end 5, location portion 6 and the second end 7 that connect gradually including the axial, first end 5 is close to cell-phone joint portion 1, second end 7 is close to working part 3, be equipped with at least a set of on location portion 6 with the locating component of annular groove 211 adaptation, locating component makes drill bushing and drill bushing joint portion 2 relatively fixed.

In this embodiment, the locating assembly includes an arcuate slot 61 and a boss 62. The arc-shaped slot 61 is arranged on the positioning portion 6 of the drill bushing and forms a spring structure 63, that is, the formed spring structure 63 is directly arranged on the side wall of the positioning portion 6, and is not an external component. The boss 62 is arranged on the inner side of the elastic sheet structure 63 relative to the drill bushing joint part 2, and the boss 62 is connected with the annular groove 211 in a buckling manner, so that the positioning assembly and the drill bushing joint part 2 are relatively fixed.

In particular, the number of such spring plate-boss type positioning assemblies in the present invention is at least one. In view of the particularity of the annular groove 211 and the resilient tab structure 63, especially the arrangement of the arc-shaped slot 61 may destroy the overall stability of the positioning portion 6, so that in order to compromise the good stability and structural simplicity of the drill bushing, the number of the resilient tab-type positioning assemblies in this embodiment is two, and the positioning assemblies are arranged axially symmetrically.

In this embodiment, the boss 62 is preferably a boss 62 having rounded corners 621 on two axial sides, and the boss 62 is beneficial to being fast and efficiently clamped into the annular groove 211, and not easy to fall off, and is beneficial to being taken out conveniently with a little force, so as to further improve the operability of the spring plate-boss type positioning assembly.

In this embodiment the stop 4 may further be provided as a raised ring having an outer diameter larger than the inner diameter of the first end of the drill bushing. The annular groove 211 is an annular groove 211 with chamfers 2111 on both axial sides. The two adjacent annular grooves 211 on the drill bushing joint part of the dental drill are arranged at equal intervals, and the distance between the two adjacent annular grooves 211 is 1 mm. At least one through hole is provided in the second end 7 of the drill bushing. The handpiece combination part 1 of the dental drill is provided with an annular color ring 11. The drill bushing is made of polyether-ether-ketone.

The dental drill component of the embodiment fixes the drill bushing on a certain annular groove 211 by the annular groove 211 which is arranged on the dental drill bit at equal intervals and by the elastic sheet-boss type positioning component on the positioning part 6 of the drill bushing, so that the adjustment of the same drill bushing but different drilling depths is realized, namely, the exposed depth of the working part 3 in the dental drill bit relative to the drill bushing can be changed by fixing the drill bushing on different annular grooves 211, thereby controlling the drilling depth of the dental drill bit during the operation. When the second end 7 of the drill bushing is pressed against the drilling object, the operator is prompted to stop drilling.

The dental drill component of the present embodiment, when taking and assembling, only needs to snap the boss 62 on the adapted drill bushing into the corresponding annular groove 211 via the working portion 3 of the dental drill according to the requirement of the required drilling depth. When the drill bit needs to be disassembled after use, the boss 62 clamped in the annular groove 211 is only required to be forcibly removed, and the drill sleeve is taken out through the working part 3 of the dental drill bit.

Example 2

Referring to fig. 1 and 7-9, a dental drill assembly comprises a dental drill and a drill bushing, wherein the dental drill comprises a handpiece combination 1, a drill bushing combination part 2, a working part 3 and a blocking part 4 which are sequentially connected in the axial direction.

In this embodiment, the structure is the same as that of embodiment 1 except that the distance between two adjacent annular grooves 211 and the positioning component on the drill bushing positioning portion 6 are different from that of embodiment 1.

Specifically, in the present embodiment, the distance between two adjacent annular grooves 211 is 0.5 mm.

In this embodiment, the positioning assembly includes a limiting sleeve assembly 64 longitudinally perpendicular to the drill sleeve joint 2 and an accommodating cavity 65 for accommodating the limiting sleeve assembly 64, and the limiting sleeve assembly 64 is elastically abutted against the annular groove 211, so that the positioning assembly is relatively fixed with the drill sleeve joint 2. Specifically, since the positioning member of the limit sleeve type does not deteriorate the overall stability of the positioning portion 6, the number of the positioning members of the limit sleeve type is one in the present embodiment in consideration of the structural simplification of the positioning portion 6.

In this embodiment, the outer sidewall of the limiting sleeve assembly 64 is in interference fit with the inner sidewall of the accommodating cavity 65. Specifically, the position limiting sleeve assembly 64 can be embedded in the accommodating cavity 65 in an embedding manner during injection molding.

In this embodiment, the position limiting sleeve assembly 64 includes a sleeve body 641, an elastic member 642 and a position limiting bead 643. The sleeve body 641 has an open end 6411, the position-limiting bead 643 is disposed at the open end 6411 of the sleeve body 641, the elastic member 642 is embedded in the sleeve body 641, and the elastic member 642 functions to allow the position-limiting bead 643 to elastically abut against the annular groove 211. The elastic component 642 of the utility model is a spring. Since the position-limiting bead 643 is not stationary during operation, the opening diameter of the open end 6411 of the sleeve body 641 is smaller than the diameter of the position-limiting bead 643, so that the position-limiting bead 643 is semi-embedded in the sleeve body 641.

The dental drill component of the embodiment is characterized in that the drill bushing is fixed on a certain annular groove 211 by the aid of the annular groove 211 which is arranged on the dental drill bit at equal intervals and the positioning component which is arranged on the positioning part 6 of the drill bushing and is in the limiting sleeve type, so that the adjustment of the same drill bushing but different drilling depths is realized, namely, the exposed depth of the working part 3 in the dental drill bit relative to the drill bushing can be changed by fixing the drill bushing on different annular grooves 211, and the drilling depth of the dental drill bit during operation is controlled. When the second end 7 of the drill bushing is pressed against the drilling object, the operator is prompted to stop drilling.

The dental drill assembly of the present embodiment, when taking and assembling, only needs to move the position-limiting bead 643 on the adapted drill bushing to the corresponding annular groove 211 via the working portion 3 of the dental drill according to the requirement of the required drilling depth to form the elastic abutment. When the dental drill needs to be disassembled after use, the limiting ball 643 is only required to be moved out of the annular groove 211 with a little force, and the drill sleeve is taken out through the working part 3 of the dental drill.

Example 3

Referring to fig. 1, 7 and 10-11, a dental drill assembly comprises a dental drill and a drill bushing, wherein the dental drill comprises a handpiece combination 1, a drill bushing combination part 2, a working part 3 and a blocking part 4 which are sequentially connected in the axial direction.

In this embodiment, the positioning assembly of the drill bushing positioning portion 6 is the same as that of embodiment 2 except that it is different from that of embodiment 2.

Specifically, in the present embodiment, the positioning assembly includes a limiting sleeve assembly 64 longitudinally perpendicular to the drill bushing junction 2 and an accommodating cavity 65 for accommodating the limiting sleeve assembly 64, and the limiting sleeve assembly 64 is elastically abutted against the annular groove 211, so that the positioning assembly is relatively fixed with the drill bushing junction 2. Specifically, since the positioning member of the limit sleeve type does not deteriorate the overall stability of the positioning portion 6, the number of the positioning members of the limit sleeve type is one in the present embodiment in consideration of the structural simplification of the positioning portion 6.

In this embodiment, the outer sidewall of the limiting sleeve assembly 64 is in threaded engagement with the inner sidewall of the receiving cavity 65. Specifically, the stop sleeve assembly 64 is removably coupled to the drill sleeve by providing external threads on the outer sidewall of the stop sleeve assembly 64 and internal threads on the inner sidewall of the receiving cavity 65. In order to improve the detachability of the limiting sleeve assembly 64, a mounting end 6412 is provided on the side of the limiting sleeve assembly 64 away from the drill sleeve joint 2.

When the dental drill assembly of the present embodiment is taken out and assembled, the entire limiting sleeve assembly 64 is installed in the drill bushing by the screwdriver through the screwing operation of the installation end 6412 of the limiting sleeve assembly 64, and then the limiting bead 643 on the drill bushing is moved to the corresponding annular groove 211 through the working portion 3 of the dental drill according to the required drilling depth to form the elastic abutment. When the dental drill needs to be disassembled after use, the limiting ball 643 is only required to be moved out of the annular groove 211 with a little force, and the drill sleeve is taken out through the working part 3 of the dental drill.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A dental drill assembly comprising a dental drill bit and a drill sleeve, characterized in that:

the dental drill comprises a handpiece combination part, a drill bushing combination part and a working part which are sequentially connected in the axial direction; at least two annular grooves which are arranged in sequence are arranged on the combining part of the drill bushing;

the drill sleeve is a hollow sleeve sleeved on the dental drill and comprises a first end part, a positioning part and a second end part which are sequentially connected in the axial direction; the first end part is close to the mobile phone combining part, and the second end part is close to the working part; and at least one group of positioning assemblies matched with the annular groove are arranged on the positioning part, and the positioning assemblies enable the drill bushing and the drill bushing combined part to be relatively fixed.

2. A dental drill assembly according to claim 1, wherein: the positioning assembly comprises an arc-shaped groove and a boss, the arc-shaped groove is formed in the positioning portion and forms an elastic sheet structure, the boss is arranged on the inner side of the elastic sheet structure relative to the drill bushing joint portion, and the boss is connected with the annular groove in a buckling mode, so that the positioning assembly and the drill bushing joint portion are relatively fixed.

3. A dental drill assembly according to claim 1, wherein: the positioning assembly comprises a limiting sleeve assembly longitudinally perpendicular to the drill bushing joint part and an accommodating cavity used for accommodating the limiting sleeve assembly, and the limiting sleeve assembly is elastically abutted against the annular groove, so that the positioning assembly and the drill bushing joint part are relatively fixed.

4. A dental drill assembly according to claim 3, wherein: the outer side wall of the limiting sleeve component is in interference fit with the inner side wall of the containing cavity.

5. A dental drill assembly according to claim 3, wherein: the outer side wall of the limiting sleeve component is in threaded fit with the inner side wall of the containing cavity.

6. A dental drill assembly according to any one of claims 3 to 5, wherein: the limiting sleeve assembly comprises a sleeve body, an elastic piece and a limiting bead; the sleeve body has an open end; the elastic piece is embedded in the sleeve body; the limiting beads are arranged at the opening end of the sleeve body and are used for being elastically abutted to the annular groove.

7. A dental drill assembly according to claim 1, wherein: the two adjacent annular grooves which are sequentially arranged on the drill bushing joint part of the dental drill are arranged at equal intervals.

8. A dental drill assembly according to claim 1, wherein: at least one through hole is arranged on the second end part of the drill bushing.

9. A dental drill assembly according to claim 1, wherein: the dental drill is characterized in that an annular color ring is arranged on the joint part of the hand piece of the dental drill.

10. A dental drill assembly according to claim 1, wherein: the drill bushing is made of one of polyether-ether-ketone, polyphenylene sulfone resin, polyether sulfone resin, polycarbonate, medical stainless steel and medical titanium alloy.