Dental bur, implant handpiece, and dental drilling device

Abstract

A dental bur (1), an implant handpiece (2), and a dental drilling device. The dental bur (1) comprises: a sleeve (11), an axial first end of the sleeve (11) being configured to be drivably connected to a drive part (23) of the implant handpiece (2) so as to rotate under the driving of the drive part (23); a cutting rod (12), an axial first end of the cutting rod (12) being located in the sleeve (11), the cutting rod (12) being telescopically arranged relative to the sleeve (11) in the axial direction, and the cutting rod (12) being configured to have a synchronous rotation state with the sleeve (11); and a cutting portion (13) connected to an axial second end of the cutting rod (12), the cutting portion (13) being close to or away from the axial second end of the sleeve (11) following the telescopic movement of the cutting rod (12) relative to the sleeve (11).

Description

Dental burs, implant handpieces, and dental drilling equipment

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese patent application No. 202411833926.9, filed on December 12, 2024, entitled “Dental Blade, Implant Handpiece and Dental Drilling Device”, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to dental instruments, and more particularly to a dental bur, implant handpiece, and dental drilling device. Background Technology

[0004] When performing dental implant surgery, especially in the molar region near the pharynx, limited space conditions severely affect the accuracy and efficiency of the procedure.

[0005] In related technologies, dental drilling devices are used to prepare implant cavities by combining fixed-length dental burs with implant handpieces. While this drilling device meets basic surgical needs to a certain extent, its limitations become apparent in areas with limited operating space within the oral cavity, such as the molar region near the pharynx. For example, when using fixed-length dental burs, at least 20mm of operating space is often required to prepare an implant cavity to a depth of 10mm. This is particularly insufficient in the narrow molar region, making the actual surgery difficult. To improve implant precision, dentists often use auxiliary tools during the procedure, such as bur guides (e.g., implant guides) or surgical robots. However, the robotic arms of these devices further increase the demand for operating space, requiring a larger patient opening. When the opening is insufficient to accommodate the head of the dental bur and auxiliary tools, the bur angle must be adjusted, sacrificing the ideal implant placement angle and site to complete the implant surgery. This can affect the surgical outcome and the patient's long-term oral health.

[0006] The above statements are for the purpose of providing background information in relation to this application only, and do not necessarily constitute prior art. Summary of the Invention

[0007] The purpose of this application is to provide a dental bur, implant handpiece, and dental drilling device to solve the problem that when the patient's opening is insufficient to accommodate the head and auxiliary tools of the dental drilling device, the bur angle must be deflected, sacrificing the ideal implantation angle and site.

[0008] A first aspect of this application provides a dental bur, comprising: a sleeve, the first axial end of which is configured to be drivenly connected to a drive unit of an implant handpiece to rotate under the drive unit; a cutting rod, the first axial end of which is located within the sleeve and is axially telescopingly disposed relative to the sleeve, the cutting rod being configured to have a synchronous rotation state with the sleeve; and a cutting portion connected to the second axial end of the cutting rod, the cutting portion moving closer to or further away from the second axial end of the sleeve following the telescoping movement of the cutting rod relative to the sleeve.

[0009] In some embodiments of the dental bur, the sleeve includes a groove at a first axial end, the sleeve being configured to be driven to connect with the drive unit via the groove.

[0010] In some embodiments of the dental bur, the dental bur further includes a connecting rod; the cutting rod has a mounting groove arranged axially and having an opening at a first axial end of the cutting rod, the connecting rod is located in the mounting groove to allow the cutting rod and the connecting rod to be axially movable relative to each other and includes a mounting section extending out of the opening and the first axial end of the sleeve, the cutting rod being configured to be driven connected to the drive unit through the mounting section.

[0011] In some embodiments of the dental bur, the mounting groove is open radially outward, and the connecting rod is located between the sleeve and the cutting rod.

[0012] In some embodiments of the dental bur, the dental bur includes a linkage limiting part configured to cause the sleeve to rotate relative to the cutting rod while the cutting rod extends and retracts axially relative to the sleeve.

[0013] In some embodiments of dental burs, the linkage limiting part is located between the sleeve and the cutting rod, and includes: a helical track disposed on one of the sleeve and the cutting rod; and a first mating body that mates with the helical track and is disposed on the other of the sleeve and the cutting rod.

[0014] In some embodiments of the dental bur, the cutting bar has a flange that slides with the inner wall of the sleeve and divides the inner cavity of the sleeve into a first cavity near an axial first end of the sleeve and a second cavity near an axial second end of the sleeve, the cutting bar being configured to extend or retract relative to the sleeve according to fluid pressure in the first cavity and the second cavity.

[0015] In some embodiments of the dental bur, the dental bur includes an anti-rotation limiting portion configured to fix the cutting bar and the sleeve relative to each other in the circumferential direction.

[0016] In some embodiments of dental burs, the anti-rotation limiting portion is located between the cutting rod and the sleeve, and includes: an axial track disposed on one of the cutting rod and the sleeve; and a second mating body, which mates with the axial track and is disposed on the other of the cutting rod and the sleeve.

[0017] In some embodiments of the dental bur, the dental bur further includes a fluid inlet / outlet module, which is rotatably connected to the sleeve and includes a first flow port and a second flow port, the first flow port communicating with the first cavity; the sleeve further includes an internal fluid channel, a first end of which communicates with the second flow port and a second end of which communicates with the second cavity.

[0018] In some embodiments of the dental bur, the dental bur further includes a spacer ring located between the fluid inlet / outlet module and the sleeve and slidingly engaging with at least one of the fluid inlet / outlet module and the sleeve, the spacer ring being configured to seal the gap between the fluid inlet / outlet module and the sleeve.

[0019] A second aspect of this application provides an implant handpiece for use with a dental bur of the first aspect of this application, the implant handpiece comprising: a drive unit configured to be drivenly connected to the sleeve and the cutting rod of the dental bur to drive the sleeve to rotate; and a telescopic control unit configured to drive the cutting rod to extend or retract axially relative to the sleeve.

[0020] In some embodiments of the implantation mobile phone, the telescopic control unit includes: a gear transmission mechanism including a sun gear, planet gears, an internal gear ring, and a gear carrier; the sun gear is drivenly connected to the drive unit to rotate under the drive of the drive unit; the sun gear has a sun gear connecting portion for non-rotational connection with the cutting rod; the planet gears are connected to the gear carrier and mesh with the sun gear and the internal gear ring; the gear carrier has a gear carrier connecting portion for non-rotational connection with the sleeve; and a braking unit having a braking state and a braking release state; in the braking state, the internal gear ring stops rotating under the restriction of the braking unit; in the braking release state, the internal gear ring rotates under the drive of the sun gear and the planet gears.

[0021] In some embodiments of the implantation mobile phone, the telescopic control unit includes: a first fluid conduit configured to communicate with the first cavity to input fluid into or receive fluid from the first cavity; and a second fluid conduit configured to communicate with the second cavity to input fluid into or receive fluid from the second cavity.

[0022] In some embodiments of the implantation handpiece, the implantation handpiece further includes a force feedback module configured to detect the resistance experienced by the drive shaft of the drive unit of the implantation handpiece during the cutting process of the cutting unit.

[0023] A third aspect of this application provides a dental drilling device, comprising: a dental bur according to a first aspect of this application; and an implant handpiece according to a second aspect of this application, wherein the dental bur is mounted on the implant handpiece, and wherein the sleeve and the cutting rod of the dental bur are motive-connected to the drive unit of the implant handpiece.

[0024] Based on the dental bur provided in this application, a sleeve and a retractable cutting rod disposed within the cavity of the sleeve are included. The cutting part connected to the cutting rod moves closer to or further away from the axial second end of the sleeve under the action of the cutting rod. Therefore, the operating space requirement can be reduced during implant cavity preparation. This facilitates the direct use of a dental drilling device including the dental bur and matching implant handpiece of this application without the need for auxiliary tools to prepare the implant cavity. On the other hand, even if auxiliary tools are required for implant cavity preparation, more working space is provided for the auxiliary tools, which helps to keep the angle of the dental bur in an optimal state, achieving a more ideal implant placement angle and site. This improves the positional accuracy of the implant, enhances surgical safety and precision, and reduces potential damage to healthy tissue, resulting in better implant surgery outcomes and helping patients maintain long-term oral health after dental implantation.

[0025] The implant handpiece and dental drilling device provided in this application have the advantages of the dental burs provided in this application.

[0026] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 is a schematic diagram of the structure of a dental bur according to some embodiments of this application.

[0029] Figure 2 is a schematic diagram of the combined structure of the telescopic control part of the implant handpiece and the dental bur in some embodiments of this application.

[0030] Figure 3 is a structural schematic diagram of the telescopic control section of the planting mobile phone in some embodiments of this application from one angle.

[0031] Figure 4 is a structural schematic diagram of the telescopic control unit of the planting mobile phone in the embodiment shown in Figure 3 from another angle.

[0032] Figure 5 is a schematic diagram of the principle structure of the braking part and its control mechanism of the telescopic control unit of the planting mobile phone according to some embodiments of this application.

[0033] Figure 6 is a schematic diagram of the principle structure of the driving unit of the planting mobile phone according to some embodiments of this application.

[0034] Figure 7 is a structural schematic diagram of a dental bur from one angle according to some embodiments of this application.

[0035] Figure 8 is a structural schematic diagram of the dental bur from another angle in the embodiment shown in Figure 7.

[0036] Figure 9 is a cross-sectional view of the dental bur of the embodiment shown in Figure 7.

[0037] Figure 10 is a schematic diagram of the telescopic control unit and drive unit of a planting mobile phone according to some embodiments of this application.

[0038] Figure 11 is a schematic diagram of the principle structure of the force feedback module of the planting mobile phone in some embodiments of this application.

[0039] Figure 12 is a block diagram of the force feedback module of the planting mobile phone in some embodiments of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0042] In the description of this application, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0043] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0044] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] As shown in Figures 1 and 7 to 9, this application embodiment provides a dental bur 1. The dental bur 1 includes a sleeve 11, a cutting rod 12, and a cutting portion 13. The first axial end of the sleeve 11 is configured to be drivenly connected to a drive portion 23 of an implant handpiece 2 to rotate under the drive of the drive portion 23. The first axial end of the cutting rod 12 is located inside the sleeve 11, and the cutting rod 12 is axially telescopically disposed relative to the sleeve 11. The cutting rod 12 is configured to rotate synchronously with the sleeve 11. The cutting portion 13 is connected to the second axial end of the cutting rod 12. The cutting portion 13 moves closer to or further away from the second axial end of the sleeve 11 following the telescopic movement of the cutting rod 12 relative to the sleeve 11.

[0046] Based on the dental bur 1 provided in this application, a sleeve 11 and a cutting rod 12 retractably disposed in the cavity of the sleeve 11 are included. The cutting part 13 connected to the cutting rod 12 moves closer to or further away from the axial second end of the sleeve 11 under the drive of the cutting rod 12. Therefore, the requirement for operating space can be reduced during implant cavity preparation. On the one hand, this facilitates the direct use of a dental drilling device including the dental bur 1 and the matching implant handpiece 2 of this application without the need for auxiliary tools to prepare the implant cavity. On the other hand, even if auxiliary tools are required for implant cavity preparation, more working space is provided for the auxiliary tools, which helps to keep the angle of the dental bur 1 in an optimal state, achieving a more ideal implant placement angle and site. This helps to improve the positional accuracy of the implant, as well as the safety and precision of the surgery, and reduces potential damage to healthy tissue, resulting in better implant surgery outcomes and helping patients maintain oral health long-term after dental implantation.

[0047] As shown in FIG1, in some embodiments of the dental bur, the sleeve 11 includes a groove 111 disposed at the first axial end, and the sleeve 11 is configured to be drivenly connected to the drive unit 23 through the groove 111.

[0048] The sleeve 11 is connected to the drive unit 23 via the slot 111, which facilitates the quick assembly and disassembly of the dental bur 1 and the implant handpiece 2 and their accurate connection, thereby improving the efficiency of implant cavity preparation.

[0049] As shown in Figure 1, in some embodiments of the dental bur, the dental bur 1 further includes a connecting rod 14, the cutting rod 12 has a mounting groove 120 arranged axially and having an opening at the first axial end of the cutting rod 12, the connecting rod 14 is located in the mounting groove 120 so that the cutting rod 12 and the connecting rod 14 can move relative to each other axially and includes a mounting section extending out of the opening and the first axial end of the sleeve 11, the cutting rod 12 is configured to be driven connected to the drive unit 23 through the mounting section.

[0050] By cooperating with the mounting groove 120, the cutting rod 12 and the cutting part 13 connected thereto can be driven to the driving part 23 of the planting handpiece 2 through the driving connection of the connecting rod 14. Thus, the cutting rod 13 and the cutting part 13 can be driven to rotate through the driving part 23, thereby realizing the cutting action of the cutting part 13 to prepare the planting hole.

[0051] As shown in Figure 1, in some embodiments of the dental bur, the mounting groove 120 is open radially outward, and the connecting rod 14 is located between the sleeve 11 and the cutting rod 12.

[0052] The radially outer side of the mounting groove 120 is open, which facilitates the generation of a large torque when the drive unit 23 drives the cutting rod 12 through the connecting rod 14, and also facilitates the preparation of the mounting groove 120 and the installation of the connecting rod 14 in the mounting groove 120.

[0053] As shown in Figure 1, in some embodiments of the dental bur, the dental bur includes a linkage limiting part, which is configured to cause the sleeve 11 to rotate relative to the cutting rod 12 while the cutting rod 12 extends and retracts axially relative to the sleeve 11.

[0054] By setting a linkage limiting part, the rotation of the cutting rod 12 relative to the sleeve 11 can realize the extension and retraction of the cutting rod 12 relative to the sleeve 11.

[0055] As shown in Figure 1, in some embodiments of the dental bur, a linkage limiting part is located between the sleeve 11 and the cutting rod 12. The linkage limiting part includes a helical track 121 and a first mating body 15. The helical track 121 is disposed on one of the sleeve 11 and the cutting rod 12. The first mating body 15 mates with the helical track 121 and is disposed on the other of the sleeve 11 and the cutting rod 12.

[0056] The linkage limiting part is located between the sleeve 11 and the cutting rod 12, eliminating the need for dedicated space for its installation. The linkage limiting part includes a helical track 121 and a first mating body 15, which helps to increase the stability and certainty of the extension and retraction of the cutting rod 12 relative to the sleeve 11.

[0057] The spiral track 121 is, for example, a raised track or a grooved track, and the first mating body 15 is, for example, a groove or rolling element that mates with the raised track, or a slider or rolling element that mates with the grooved track.

[0058] As shown in Figures 7 to 9, in some embodiments of the dental bur, the cutting bar 12 has a flange 122. The flange 122 slides against the inner wall of the sleeve 11 and divides the inner cavity of the sleeve 11 into a first cavity 11A near an axial first end of the sleeve 11 and a second cavity 11B near an axial second end of the sleeve 11. The cutting bar 12 is configured to extend or retract relative to the sleeve 11 according to the fluid pressure within the first cavity 11A and the second cavity 11B.

[0059] The above settings enable the cutting rod 12 to extend and retract relative to the sleeve 11 via fluid drive, thereby allowing the cutting part 13 to move closer to or further away from the axial second end of the sleeve 11 through the extension and retraction of the cutting rod 12, which is beneficial for adjusting the operating space required when preparing planting holes.

[0060] As shown in Figures 7 to 9, in some embodiments of dental burs, the dental bur 1 includes an anti-rotation limiting portion configured to fix the cutting bar 12 and the sleeve 11 relative to each other in the circumferential direction.

[0061] By setting a rotation-stopping limit part, the cutting rod 12 can rotate with the rotation of the sleeve 11. Thus, the drive part 23 of the implantation handpiece 2 simultaneously drives the sleeve 11, the cutting rod 12 and the cutting part 13 connected to the cutting rod 12 to rotate, thereby realizing the cutting action of the cutting part 13 to prepare the implantation cavity.

[0062] As shown in Figures 7 to 9, in some embodiments of the dental bur, an anti-rotation limiting portion is located between the cutting rod 12 and the sleeve 11. The anti-rotation limiting portion includes an axial track 112 and a second mating body 1221. The axial track 112 is disposed on one of the cutting rod 12 and the sleeve 11. The second mating body 1221 mates with the axial track 112 and is disposed on the other of the cutting rod 12 and the sleeve 11.

[0063] The anti-rotation limiting part is located between the sleeve 11 and the cutting rod 12, eliminating the need for dedicated space for the anti-rotation limiting part. The anti-rotation limiting part includes an axial track 112 and a second mating body 1221, which helps to guide the extension and retraction of the cutting rod 12 relative to the sleeve 11, thereby improving the stability and certainty of the extension and retraction of the cutting rod 12 relative to the sleeve 11.

[0064] The axial track is, for example, a raised track or a grooved track, and the second mating body is, for example, a groove or rolling element that mates with the raised track, or a slider or rolling element that mates with the grooved track.

[0065] As shown in Figures 7 to 9, in some embodiments of the dental bur, the dental bur 1 further includes a fluid inlet / outlet module 18. The fluid inlet / outlet module 18 is rotatably connected to the sleeve 11. The fluid inlet / outlet module 18 includes a first flow port 181 and a second flow port 182. The first flow port 181 communicates with a first cavity 11A. The sleeve 11 also includes an internal fluid channel 113. A first end of the internal fluid channel 113 communicates with the second flow port 182, and a second end of the internal fluid channel 113 communicates with a second cavity 11B.

[0066] By setting up a fluid inlet / outlet module 18, which is rotatable relative to the sleeve 11, the fluid inlet / outlet module 18 does not rotate with the sleeve 11 when the sleeve 11 rotates. This allows the fluid pipelines connected to the fluid inlet / outlet module 18 (the first fluid pipeline 241 and the second fluid pipeline 242 as shown in Figure 10) to remain unrotated, thus facilitating the installation of fluid pipelines and hydraulic components connected to them.

[0067] As shown in Figures 7 to 9, in some embodiments of the dental bur, the dental bur 1 further includes a spacer ring 17, which is located between the fluid inlet / outlet module 18 and the sleeve 11 and is slidably engaged with at least one of the fluid inlet / outlet module 18 and the sleeve 11. The spacer ring 17 is configured to seal the gap between the fluid inlet / outlet module 18 and the sleeve 11.

[0068] The isolation ring 17 facilitates a sealed connection between the fluid inlet / outlet module 18 and the sleeve 11 on a rotatable basis, thereby ensuring relative rotation between the fluid inlet / outlet module 18 and the sleeve 11 while preventing fluid leakage.

[0069] As shown in Figures 2 to 6 and Figure 10, a second aspect of this application provides an implant handpiece for use with a dental bur of the first aspect of this application. The implant handpiece includes a drive unit 23 and a telescopic control unit. The drive unit 23 is configured to drively connect to the sleeve 11 of the dental bur 1 and the cutting rod 12. The telescopic control unit is configured to drive the cutting rod 12 to extend and retract axially relative to the sleeve 11.

[0070] The implant handpiece 2 provided in this application has the advantages of the dental bur 1 provided in this application. Specifically, the implant handpiece is equipped with a telescopic control unit, which allows the cutting rod 12 to extend or retract axially relative to the sleeve 11. This allows the cutting part 13 to move closer to or further away from the axial second end of the sleeve 11 via the extension or retraction of the cutting rod 12, thus reducing the operating space required for preparing the implant cavity.

[0071] As shown in Figures 2 to 6, in some embodiments of the implant handpiece, a telescopic control unit is configured to drive the cutting rod 12 of the dental bur to extend and retract axially relative to the sleeve 11. The telescopic control unit includes a gear transmission mechanism 21 and a braking unit 22. The gear transmission mechanism 21 includes a sun gear 211, planet gears 212, an internal gear ring 213, and a gear carrier 214. The sun gear 211 is drivenly connected to the drive unit 23 to rotate under the drive of the drive unit 23. The sun gear 211 has a sun gear connecting portion for connecting with the cutting rod 12 without relative rotation. The planet gears 212 are connected to the gear carrier 214 and mesh with the sun gear 211 and the internal gear ring 213. The gear carrier 214 has a gear carrier connecting portion for connecting with the sleeve 11 without relative rotation. The braking unit 22 has a braking state and a braking release state. In the braking state, the internal gear ring 213 stops rotating under the restriction of the braking unit 22. When the brake is released, the internal gear ring 213 rotates under the drive of the sun gear 211 and the planet gear 212.

[0072] The telescopic control unit includes a gear transmission mechanism 21 and a braking unit 22. When the braking unit 22 is in the braking state, the internal gear ring 213 does not rotate when the sun gear 211 rotates, thereby forming a planetary gear train in the gear transmission mechanism 21. The planet gears 212 and the gear carrier 214 rotate at a differential speed with the sun gear 211, that is, the sun gear 211 and the planet carrier 214 rotate relative to each other. With the relative rotation of the sun gear 211 and the internal gear ring 214, the telescopic movement of the cutting rod 12 relative to the sleeve 11 can be realized under the restriction of the linkage limiting unit. When the brake part 22 is in the brake-released state, the movement of the internal gear ring 213 is unrestricted, so that when the sun gear 211 rotates, the gear carrier 214 connected to the planet gear 212 does not rotate relative to the sun gear 211. Consequently, there is no relative rotation between the sleeve 11 and the cutting rod 12 connected to the sun gear 211 and the gear carrier 214 respectively, thus generating synchronous rotation. The cutting rod 12 does not extend or retract relative to the sleeve 11, and the axial second end position of the cutting part 13 relative to the sleeve 11 remains unchanged, so that planting holes can be prepared at a fixed position relative to the sleeve 11.

[0073] As shown in Figure 10, in some embodiments of the implant handpiece, the telescopic control unit is configured such that the cutting rod 12 of the dental bur extends and retracts axially relative to the sleeve 11. The telescopic control unit includes a first fluid line 241 and a second fluid line 242. The first fluid line 241 is configured to communicate with a first cavity 11A to input or receive fluid into or from the first cavity 11A; and the second fluid line 242 is configured to communicate with a second cavity 11B to input or receive fluid into or from the second cavity 11B.

[0074] By setting up a first fluid line 241 and a second fluid line 242, the cutting rod 12 can extend relative to the sleeve 11 by inputting pressurized fluid into the first fluid line 241 and receiving fluid from the second fluid line 242, and the cutting rod 12 can retract relative to the sleeve 11 by inputting pressurized fluid into the second fluid line 242 and receiving fluid from the first fluid line 241.

[0075] As shown in Figures 11 and 12, in some embodiments of the implantation mobile phone, the implantation mobile phone 2 further includes a force feedback module 27, which is configured to detect the resistance experienced by the drive shaft 231 of the drive unit 23 of the implantation mobile phone during the cutting process of the cutting unit 13.

[0076] The force feedback module 27 detects the resistance encountered by the drive shaft 231 of the implantation handpiece 23 during the cutting process of the cutting part 13, that is, the resistance encountered by the cutting part 13 when preparing the implantation cavity. Based on the resistance, information such as bone density and cutting depth of the cutting part can be determined, which is conducive to more accurate and efficient preparation of the implantation cavity.

[0077] As shown in Figures 1 to 12, a third aspect of this application provides a dental drilling device, including: a dental bur 1 according to the first aspect of this application; and an implant handpiece 2 according to the second aspect of this application. The dental bur 1 is mounted on the implant handpiece 2, wherein the sleeve 11 and the cutting rod 12 of the dental bur 1 are drivenly connected to the drive unit 23 of the implant handpiece 2.

[0078] The dental drilling device provided in this application has the advantages of the dental bur 1 and implant handpiece 2 provided in this application.

[0079] The embodiments of this application will be described in more detail below with reference to Figures 1 to 12.

[0080] Figures 1 to 6 illustrate dental burs 1, implant handpieces 2, and dental drilling devices according to some embodiments of this application.

[0081] As shown in Figures 1 to 6, embodiments of this application provide a dental bur 1, an implant handpiece 2, and a dental drilling device including the dental bur 1 and the implant handpiece 2.

[0082] As shown in Figure 1, the dental bur 1 mainly includes a sleeve 11, a cutting rod 12, a cutting part 13, a connecting rod 14, and a linkage limiting part.

[0083] The first axial end of the sleeve 11 is configured to be driven to rotate by the drive unit 23 of the implantation handpiece 2. The sleeve 11 includes a groove 111 disposed at the first axial end, and the sleeve 11 is configured to be driven to rotate by the drive unit 23 through the groove 111. The groove 111 is disposed around the circumference of the sleeve 11 to facilitate quick engagement with the retaining strip 2141 without having to find the engagement angle.

[0084] The first axial end of the cutting rod 12 is located within the sleeve 11, and the cutting rod 12 is axially telescopingly disposed relative to the sleeve 11. The cutting rod 12 is configured to rotate synchronously with the sleeve 11. The cutting rod 12 has a mounting groove 120 axially disposed and having an opening at the first axial end of the cutting rod 12. A connecting rod 14 is located within the mounting groove 120 to allow the cutting rod 12 and the connecting rod 14 to move relative to each other axially and includes a mounting section extending out of the opening and the first axial end of the sleeve 11. The cutting rod 12 is configured to be driven connected to the drive unit 23 via the mounting section. The mounting groove 120 is open radially outward, and the connecting rod 14 is located between the sleeve 11 and the cutting rod 12.

[0085] The cutting portion 13 is connected to the axial second end of the cutting rod 12. The cutting portion 13 moves closer to or further away from the axial second end of the sleeve 11 as the cutting rod 12 extends and retracts relative to the sleeve 11. The cutting portion 13 includes a plurality of cutting edges 131 evenly arranged circumferentially. For example, in this embodiment, the cutting portion 13 includes six cutting edges 131.

[0086] The dental bur 1 includes a linkage limiting part configured to cause the sleeve 11 to rotate relative to the cutting rod 12 while the cutting rod 12 extends and retracts axially relative to the sleeve 11. The linkage limiting part is located between the sleeve 11 and the cutting rod 12. The linkage limiting part includes a helical track 121 and a slider as a first mating body 15. The helical track 121 is a grooved track provided on the cutting rod 12. The slider mates with the helical track 121 and is provided on the sleeve 11. In this embodiment, the grooved track has a semi-circular cross-section, and the slider is configured as a hemispherical protrusion.

[0087] The implant handpiece 2 shown in Figures 2 to 6 is used in conjunction with the dental bur 1 shown in Figure 1.

[0088] The implant handpiece includes a drive unit 23 and a telescopic control unit. The drive unit 23 is also configured to drively connect with the sleeve 11 and cutting rod 12 of the dental bur 1 to drive the sleeve 11 and cutting rod 12 to rotate. The telescopic control unit is configured to drive the cutting rod 12 to extend and retract axially relative to the sleeve 11.

[0089] As shown in Figures 2 to 6, the telescopic control unit includes a gear transmission mechanism 21 and a braking unit 22.

[0090] The gear transmission mechanism 21 includes a sun gear 211, planet gears 212, an internal gear ring 213, a gear carrier 214, and a gear shaft 215.

[0091] The sun gear 211 is driven to rotate under the drive of the drive unit 23. The sun gear 211 has a sun gear connecting part for connecting with the cutting rod 12 without relative rotation.

[0092] As shown in Figure 1, the gear shaft 215 is coaxially and fixedly disposed at the first axial end of the sun gear 211, and an anti-rotation plane 2151 is provided on the gear shaft 215. The drive unit 23 of the implantation mobile phone 2 includes a drive shaft 231 that cooperates with the gear shaft 215. The drive shaft 231 has a mounting port that cooperates with the gear shaft 215, and the inner wall of the mounting port includes an anti-rotation wall surface that cooperates with the anti-rotation plane 2151. The drive connection between the drive unit 23 and the sun gear 211 is realized through the cooperation between the mounting port and the gear shaft 215. The sun gear connecting part includes a fixing hole 2111 disposed on the end face of the second axial end of the sun gear 211. The connecting section of the first axial end of the protruding sleeve 11 of the connecting rod 14 is installed in the fixing hole 2111, so that the connecting rod 14 is installed on the sun gear 211. The connecting rod 14 is connected to the cutting rod 12 without relative rotation, thereby realizing the connection of the cutting rod 12 with respect to the sun gear 211 without relative rotation, thus enabling the driving connection between the cutting rod 12 and the drive unit 23.

[0093] Other structures of the drive unit 23, besides the drive shaft 231, can adopt the corresponding structures of the drive unit of the planted mobile phone using related technologies.

[0094] Planetary gear 212 is connected to gear carrier 214 and meshes with sun gear 211 and internal gear ring 213. Gear carrier 214 has gear carrier connecting part, which is used to connect with sleeve 11 without relative rotation.

[0095] The braking unit 22 has a braking state and a braking release state. In the braking state, the internal gear ring 213 stops rotating under the restriction of the braking unit 22. In the braking release state, the internal gear ring 213 rotates under the drive of the sun gear 211 and the planet gears 212.

[0096] In the embodiments shown in Figures 2 to 6, the braking unit 22 includes a brake block 221, a brake cable 222, and a brake control unit 223. The brake block 221 is disposed outside the internal gear ring 213, for example, on the radially or axially outer side of the internal gear ring 213. There can be multiple brake blocks 221; for example, in the embodiments shown in Figures 2 to 6, there are three brake blocks 221, which are evenly arranged circumferentially on the radially outer side of the internal gear ring 213. The brake cables are arranged one-to-one with the brake blocks 221. In this embodiment, the three brake cables 222 control the three brake blocks 221 respectively. The brake control unit 223 is, for example, a brake control button or brake control lever disposed on the housing of the implantable mobile phone 2. By pressing and releasing the brake control button or hooking or releasing the brake control lever, the brake cable 222 is tightened or loosened, thereby controlling the movement of the brake block 221 and switching the braking unit 22 between a braking state and a brake release state.

[0097] In embodiments not shown, the braking unit 22 may control the brake block 221 in other ways, such as by using a hydraulic drive mechanism, a pneumatic drive mechanism or an electromagnetic drive mechanism to control the movement of the brake block 221 and thus switch the braking unit 22 between its braking state and braking release state.

[0098] The dental drilling device includes a dental bur 1 and an implant handpiece 2. The dental bur 1 is mounted on the implant handpiece 2. The sleeve 11 and the cutting rod 12 of the dental bur 1 are drivenly connected to the drive unit 23 of the implant handpiece 2.

[0099] The dental drilling device of this application embodiment includes a dental bur 1 and an implant handpiece 2. The assembly and operation method of the dental drilling device are described below.

[0100] In its initial state, the cutting rod 12 of the dental bur 1 is retracted relative to the sleeve 11. The mounting section of the connecting rod 14 is aligned with the fixing hole 2111 of the sun gear 211, and the mounting section is inserted into the fixing hole 2111. At the same time, the slot 111 on the sleeve 11 and the retaining strip 2141 on the gear carrier 214 cooperate to install the dental bur 1 onto the implant handpiece 2 to form a dental drilling device.

[0101] The sun gear 211 rotates synchronously with the cutting rod 12 via the connecting rod 14, and the gear carrier 214 rotates synchronously with the sleeve 11 via the slot 111 and the retaining strip 2141. The implantation handpiece 2 is connected to the gear shaft 215 connected to the sun gear 211 via the drive shaft 231 of the drive unit 23, and the power of the drive unit is input to the sun gear 211 through the cooperation between the gear plane 2151 of the gear shaft 215 and the anti-rotation wall of the drive shaft 231.

[0102] When the brake unit 22 is in the brake release state, its brake block 221 is separated from the internal gear ring 213, and there is no relative rotation between the sun gear 211 and the gear carrier 214 of the gear transmission mechanism 21. The sun gear 211 drives the cutting rod 12 and the cutting part 13 connected to the cutting rod 12, as well as the gear carrier 214 and the sleeve 11 connected to the gear carrier 214 to rotate synchronously. That is, the drive unit 23 drives the dental bur 1 to rotate as a whole through the gear transmission mechanism 21, and the cutting rod 12 will not extend out of the sleeve 11.

[0103] When the braking part 22 is in the braking state, its braking block 221 engages with the internal gear ring 213, locking the internal gear ring 213. At this time, the gear transmission mechanism 21 forms a planetary gear system with the internal gear ring 213 fixed. The sun gear 211 and the gear carrier 214 rotate in the same direction at a differential speed. The cutting rod 12, which is connected to the sun gear 211 through the connecting rod 14, and the sleeve 11, which is connected to the gear carrier 214, rotate relative to each other. The slider, which is the first mating body 15, moves along the spiral track 121. At this time, the cutting rod 12 extends from the second axial end of the sleeve 11 to the outside of the sleeve 11 under the joint constraint of the linkage limiting part and the connecting rod 14. The cutting part 13 moves away from the second axial end of the sleeve 11, and the length of the dental bur 1 increases.

[0104] When the brake 22 is in a braking state and the sun gear 211 rotates in the opposite direction under the drive of the drive 23, the cutting rod 12 retracts inward relative to the sleeve 11, the cutting part 13 moves towards the second axial end of the sleeve 11, and the length of the dental bur 1 decreases.

[0105] The brake block 221 is controlled by the brake control button and brake cable 222, which serve as the brake control unit 223. Depending on the actual operation needs, the brake block 221 can be controlled to lock the internal gear ring 213, thereby controlling whether the cutting rod 12 extends or retracts relative to the sleeve 11, and thus controlling the length of the dental bur 1.

[0106] Figures 7 to 12 illustrate dental burs 1, implant handpieces 2, and dental drilling devices according to some embodiments of this application.

[0107] As shown in Figures 7 to 12, embodiments of this application provide a dental bur 1, an implant handpiece 2, and a dental drilling device including the dental bur 1 and the implant handpiece 2.

[0108] As shown in Figures 7 to 9, the dental bur 1 includes a sleeve 11, a cutting rod 12, a cutting section 13, a spacer ring 17, and a fluid inlet / outlet module 18.

[0109] The first axial end of the sleeve 11 is configured to be driven to connect with the drive unit 23 of the implantation handpiece 2 so as to rotate under the drive of the drive unit 23.

[0110] The first axial end of the cutting rod 12 is located inside the sleeve 11, and the cutting rod 12 is axially telescoping relative to the sleeve 11. In this embodiment, as shown in Figures 7 to 9, the cutting rod 12 has a flange 122 that slides against the inner wall of the sleeve 11 and divides the inner cavity of the sleeve 11 into a first cavity 11A near the first axial end of the sleeve 11 and a second cavity 11B near the second axial end of the sleeve 11. The cutting rod 12 is configured to telescop and extend relative to the sleeve 11 according to the fluid pressure in the first cavity 11A and the second cavity 11B. The fluid may be, for example, oil.

[0111] The cutting rod 12 is configured to rotate synchronously with the sleeve 11. In this embodiment, the dental bur 1 includes an anti-rotation limiting part, which is configured to fix the cutting rod 12 and the sleeve 11 relative to each other in the circumferential direction. The anti-rotation limiting part is located between the cutting rod 12 and the sleeve 11. The anti-rotation limiting part includes an axial track 112 and a second mating body 1221. The axial track 112 is a grooved track provided on the sleeve 11. The second mating body 1221 mates with the axial track 112 and is a protrusion 1221 provided on the flange 122 of the cutting rod 12. Due to the anti-rotation limiting part, the cutting rod 12 and the cutting part 13 connected to the cutting rod 12 always rotate synchronously with the sleeve 11, so that the dental bur 1 can rotate under the drive of the drive unit 23.

[0112] The cutting portion 13 is connected to the axial second end of the cutting rod 12. The cutting portion 13 moves closer to or further away from the axial second end of the sleeve 11 as the cutting rod 12 extends and retracts relative to the sleeve 11. The cutting portion 13 includes a plurality of cutting edges 131 evenly arranged circumferentially. For example, in this embodiment, the cutting portion 13 includes six cutting edges 131.

[0113] The fluid inlet / outlet module 18 is rotatably connected to the sleeve 11. The fluid inlet / outlet module 18 includes a first flow port 181 and a second flow port 182. The first flow port 181 communicates with the first cavity 11A. The sleeve 11 also includes an internal fluid channel 113, the first end of which communicates with the second flow port 182, and the second end of which communicates with the second cavity 11B.

[0114] The isolation ring 17 is located between the fluid inlet / outlet module 18 and the sleeve 11 and slides in engagement with at least one of the fluid inlet / outlet module 18 and the sleeve 11. The isolation ring 17 is configured to seal the gap between the fluid inlet / outlet module 18 and the sleeve 11.

[0115] As shown in Figure 10, the implant handpiece 2 is used in conjunction with the dental bur 1. The implant handpiece 2 includes a drive unit 23 and a telescopic control unit.

[0116] The drive unit 23 is configured to drively connect with the sleeve 11 and cutting rod 12 of the dental bur 1. The sleeve 11 has a connecting shaft 114 at its axial first end, and the connecting shaft 114 has an anti-rotation plane 1141. The drive shaft 231 of the drive unit 23 of the implant handpiece 2 has a mounting port that mates with the connecting shaft 114, and the inner wall of the mounting port includes an anti-rotation wall surface that mates with the anti-rotation plane 1141. Additionally, the implant handpiece 2 includes a receiving space 25 communicating with the mounting port, and the axial first end of the sleeve 11 connected to its connecting shaft 114 can extend into the receiving space 25. To fix the axial relative position between the sleeve 11 of the dental bur 1 and the implant handpiece 2, a slot and a retaining strip similar to those shown in the embodiments of Figures 1 to 6 can also be provided. For example, a slot can be provided on the circumferential outer side of the axial first end of the sleeve 11, and a retaining strip can be provided on the inner wall of the receiving space 25. After the sleeve 11 extends into the receiving space 25, the slot and the retaining strip engage, which determines the axial position of the sleeve 11 and the receiving space 25. It can be seen that the drive unit 23 can achieve a drive connection with the connecting shaft 114 and the sleeve 11 through the engagement of the mounting port and the connecting shaft 114. Since the cutting rod 12 and the sleeve 11 rotate synchronously under the restriction of the anti-rotation limiting part, the drive unit 23 can drive the dental bur 1 to rotate as a whole.

[0117] Other structures of the drive unit 23, besides the drive shaft 231, can adopt the corresponding structures of the drive unit of the planted mobile phone using related technologies.

[0118] The telescopic control unit is configured to drive the cutting rod 12 to extend and retract axially relative to the sleeve 11. As shown in FIG10, the telescopic control unit includes a first fluid line 241 and a second fluid line 242. The first fluid line 241 is configured to communicate with a first cavity 11A to input or receive fluid into or from the first cavity 11A; and the second fluid line 242 is configured to communicate with a second cavity 11B to input or receive fluid into or from the second cavity 11B. In this embodiment, the first fluid line 241 is in fluid communication with the first cavity 11A through a first first flow port 18181 of the fluid inlet / outlet module 18; and the second fluid line 242 is in fluid communication with the second cavity 11B through a second first flow port 18182 of the fluid inlet / outlet module 18. The extension of the cutting rod 12 relative to the sleeve 11 can be achieved by inputting pressurized fluid into the first fluid line 241 and receiving fluid from the second fluid line 242. The cutting rod 12 retracts relative to the sleeve 11 by inputting pressurized fluid into the second fluid line 242 and receiving fluid from the first fluid line 241.

[0119] As shown in Figures 11 and 12, the implantation mobile phone 2 of this application embodiment may include a force feedback module 27, which is configured to detect the resistance encountered by the drive shaft 231 of the drive unit 23 of the implantation mobile phone 2 during the cutting process of the cutting unit 13.

[0120] As shown in Figures 11 and 12, the force feedback module 27 may include, for example, a piezoelectric sensor 271 disposed between the anti-rotation plane 1141 of the connecting shaft 114 of the sleeve 11 and the anti-rotation wall 2311 of the drive shaft 231, a controller 272 signal-connected to the piezoelectric sensor 271, and a display screen 273 signal-connected to the controller 272. The controller 272 is configured to determine the resistance experienced by the drive shaft 231 during the cutting process of the cutting section 13 based on the detection information from the piezoelectric sensor, and accordingly determine information such as bone density and cutting depth at the cutting site. The display screen, signal-connected to the controller, is configured to display the aforementioned resistance, bone density, cutting depth, etc., for the physician to determine the next operation to be performed.

[0121] The controller in this application embodiment can be implemented as, for example, a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.

[0122] Similar to this application, the embodiments shown in Figures 1 to 6 may also include a force feedback module. The force feedback module may, for example, include a piezoelectric sensor disposed between the anti-rotation plane 2151 of its gear shaft 215 and the anti-rotation wall of its drive shaft 231, a controller connected to the piezoelectric sensor signal, and a display screen connected to the controller.

[0123] The dental drilling device of this application embodiment includes a dental bur 1 and an implant handpiece 2. The assembly and operation method of the dental drilling device are described below.

[0124] In its initial state, the cutting rod 12 of the dental bur 1 is retracted relative to the sleeve 11. By extending the sleeve 11 into the receiving space 25 of the implant handpiece 2, the connecting shaft 114 of the sleeve 11 engages with the mounting port of the drive shaft 231 of the drive unit 23, the anti-rotation plane 1141 engages with the anti-rotation wall surface of the mounting port, and the groove at the first axial end of the sleeve 11 engages with the retaining strip on the inner wall of the receiving space 24, allowing the dental bur 1 and the implant handpiece 2 to be quickly connected, forming the dental drilling device of this embodiment. The implant handpiece 2 drives the dental bur 1 to rotate via the drive unit 23.

[0125] After the dental bur 1 is connected to the implant handpiece 2, the first fluid line 241 is connected to the first flow port 181, and the second fluid line 242 is connected to the first flow port 182. The first flow port 181 is connected to the first cavity 11A, and the second flow port 182 is connected to the second cavity 11B through the internal fluid channel 113. The extension and retraction of the cutting rod 12 relative to the sleeve 11 is controlled by the flow of oil in and out of the first cavity 11A and the second cavity 11B.

[0126] When the first fluid line 241 delivers oil to the first cavity 11A through the first flow port 181, the second fluid line 242 receives oil from the second cavity 11B through the internal fluid channel 113 and the second flow port 182, the cutting rod 12 extends outward from the second axial end of the sleeve 11 along the axial track 112 under the restriction of the anti-rotation limiting part, and the cutting part 13 moves away from the second axial end of the sleeve 11, and the length of the dental bur 1 increases.

[0127] Conversely, when the first fluid line 241 receives oil from the first cavity 11A through the first flow port 181, and the second fluid line 242 delivers oil to the second cavity 11B through the second flow port 182 and the internal fluid channel 113, the cutting rod 12 retracts into the sleeve 11 along the axial track 112 under the restriction of the anti-rotation limiting part, and the cutting part 13 moves towards the second axial end of the sleeve 11, and the length of the dental bur 1 becomes smaller.

[0128] The fluid inlet / outlet module 18 achieves dynamic and static separation through the connecting shaft 114 of the sleeve 11 and the fluid pipeline via the isolation ring 17. That is, when the sleeve 11, the cutting rod 12, and the cutting part 13 connected to the cutting rod 12 rotate at high speed, the fluid inlet / outlet module 18 does not rotate with the dental bur 1, thereby avoiding the fluid pipeline from getting tangled together.

[0129] As can be seen from the above description, the dental bur, implant handpiece, and dental drilling device of the present application embodiments have at least one of the following advantages:

[0130] The length of the dental bur can be adjusted. For example, when the cutting bar is fully retracted into the sleeve, the length of the dental bur can be half that of a traditional bur. This requires less operating space when preparing implant cavities, making it suitable for patients with smaller openings. It also helps to keep the angle of the dental bur in the best possible position, achieving a more ideal implant placement angle and site. This improves the positional accuracy of the implant, enhances surgical safety and precision, and reduces potential damage to healthy tissues, resulting in better implant surgery outcomes and helping patients maintain long-term oral health after dental implantation.

[0131] This helps to shorten the operation time, reduces the number of times dental burs need to be changed and the waiting time, making the entire operation process smoother and faster.

[0132] Dental burs improve the universality and convenience of surgery, adapting to various surgical needs, reducing the operational burden on medical personnel, and lowering the complexity of surgery.

[0133] This reduces the use of consumable materials, lowers surgical costs, and improves economic efficiency.

[0134] By setting up a force feedback module, it is possible to achieve real-time monitoring and intelligent adjustment of the surgical process, thereby improving the safety and success rate of the surgery.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A dental bur, comprising: Sleeve (11), the first axial end of which is configured to be drivenly connected to the drive unit (23) of the implantation handpiece (2) to rotate under the drive of the drive unit (23); A cutting rod (12), the first axial end of which is located inside the sleeve (11) and the cutting rod (12) is axially telescopingly disposed relative to the sleeve (11), the cutting rod (12) being configured to rotate synchronously with the sleeve (11); and The cutting part (13) is connected to the second axial end of the cutting rod (12). The cutting part (13) moves closer to or further away from the second axial end of the sleeve (11) as the cutting rod (12) moves relative to the sleeve (11) during its extension and retraction.

2. The dental bur according to claim 1, wherein the sleeve (11) includes a groove (111) disposed at a first axial end, the sleeve (11) being configured to be drivenly connected to the drive unit (23) via the groove (111).

3. The dental bur according to claim 1, wherein The dental bur (1) also includes a connecting rod (14); The cutting rod (12) has a mounting groove (120) arranged axially and having an opening at a first axial end of the cutting rod (12). The connecting rod (14) is located in the mounting groove (120) to allow the cutting rod (12) and the connecting rod (14) to be axially movable relative to each other and includes a mounting section extending out of the opening and the first axial end of the sleeve (11). The cutting rod (12) is configured to be driven connected to the drive unit (23) through the mounting section.

4. The dental bur according to claim 3, wherein the mounting groove (120) is open radially outward, and the connecting rod (14) is located between the sleeve (11) and the cutting rod (12).

5. The dental bur according to any one of claims 1 to 4, comprising a linkage limiting part configured to cause the sleeve (11) to rotate relative to the cutting rod (12) while the cutting rod (12) extends and retracts axially relative to the sleeve (11).

6. The dental bur according to claim 5, wherein the linkage limiting part is located between the sleeve (11) and the cutting rod (12), comprising: A helical track (121) is disposed on one of the sleeve (11) and the cutting rod (12); and The first mating body (15) mates with the spiral track (121) and is disposed on the other side of the sleeve (11) and the cutting rod (12).

7. The dental bur of claim 1, wherein the cutting rod (12) has a flange (122) that slides with the inner wall of the sleeve (11) and divides the inner cavity of the sleeve (11) into a first cavity (11A) near an axial first end of the sleeve (11) and a second cavity (11B) near an axial second end of the sleeve (11), the cutting rod (12) being configured to extend or retract relative to the sleeve (11) according to fluid pressure in the first cavity (11A) and the second cavity (11B).

8. The dental bur according to claim 7, wherein the dental bur (1) includes an anti-rotation limiting portion configured to fix the cutting bar (12) and the sleeve (11) relative to each other in the circumferential direction.

9. The dental bur according to claim 8, wherein the anti-rotation limiting portion is located between the cutting rod (12) and the sleeve (11), comprising: An axial track (112) is provided on one of the cutting rod (12) and the sleeve (11); and The second mating body (1221) mates with the axial track (112) and is disposed on the other side of the cutting rod (12) and the sleeve (11).

10. The dental bur according to any one of claims 7 to 9, wherein The dental bur (1) further includes a fluid inlet / outlet module (18), which is rotatably connected to the sleeve (11) and includes a first flow port (181) and a second flow port (182). The first flow port (181) is connected to the first cavity (11A). The sleeve (11) further includes an internal fluid channel (113), the first end of which is connected to the second flow port (182), and the second end of which is connected to the second cavity (11B).

11. The dental bur of claim 10, wherein the dental bur (1) further comprises an isolation ring (17) located between the fluid inlet / outlet module (18) and the sleeve (11) and slidably engaged with at least one of the fluid inlet / outlet module (18) and the sleeve (11), the isolation ring (17) being configured to seal the gap between the fluid inlet / outlet module (18) and the sleeve (11).

12. An implant handpiece for use with a dental bur according to any one of claims 1 to 11, comprising: A drive unit (23) configured to drively connect with the sleeve (11) and the cutting rod (12) of the dental bur (1); and The telescopic control unit is configured to drive the cutting rod (12) to extend or retract axially relative to the sleeve (11).

13. The implant handpiece according to claim 12, wherein the telescopic control unit is configured to drive the cutting bar (12) of the dental bur according to any one of claims 1 to 6 to telescopically extend and retract axially relative to the sleeve (11), the telescopic control unit comprising: The gear transmission mechanism (21) includes a sun gear (211), planet gears (212), an internal gear ring (213), and a gear carrier (214). The sun gear (211) is driven to rotate under the drive of the drive unit (23). The sun gear (211) has a sun gear connecting part for connecting with the cutting rod (12) without relative rotation. The planet gears (212) are connected to the gear carrier (214) and mesh with the sun gear (211) and the internal gear ring (213). The gear carrier (214) has a gear carrier connecting part for connecting with the sleeve (11) without relative rotation. and The braking unit (22) has a braking state and a braking release state. In the braking state, the internal gear ring (213) stops rotating under the restriction of the braking unit (22). In the braking release state, the internal gear ring (213) rotates under the drive of the sun gear (211) and the planet gear (212).

14. The implant handpiece according to claim 12, wherein the telescopic control unit is configured to drive the cutting bar (12) of the dental bur according to any one of claims 1, 7 to 11 to telescopically extend and retract axially relative to the sleeve (11), the telescopic control unit comprising: A first fluid line (241) is configured to communicate with the first cavity (11A) to input fluid into or receive fluid from the first cavity (11A); and A second fluid line (242) is configured to communicate with the second cavity (11B) to input fluid into or receive fluid from the second cavity (11B).

15. The implantation mobile phone according to any one of claims 12 to 14, wherein the implantation mobile phone (2) further comprises a force feedback module (27) configured to detect the resistance experienced by the drive shaft (231) of the drive unit (23) of the implantation mobile phone during the cutting process of the cutting unit (13).

16. A dental drilling apparatus, comprising: Dental bur (1) according to any one of claims 1-11; and The implant handpiece (2) according to any one of claims 12-15, wherein the dental bur (1) is mounted on the implant handpiece (2), wherein the sleeve (11) and the cutting rod (12) of the dental bur (1) are drivenly connected to the drive unit (23) of the implant handpiece (2).

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