Orthodontic micro-implant anchorage nail for cheek shed area of lower jaw

Abstract

The utility model discloses an orthodontic micro-implant anchorage nail for a lower jaw cheek shed area, which belongs to the technical field of tooth orthodontic instruments and is characterized in that the vertex angle of a thread on a body part is 45 degrees, and the length of the body part is 12mm; the maximum diameter of the body part is 1.4 mm, the thread height is 0.2 mm, and the thread pitch is 0.6 mm. By limiting the length of the anchorage nail and the vertex angle of the thread, the success rate of application of the micro-implant anchorage nail in the cheek-shed area of the lower jaw can be improved, and anchorage nail related treatment can be carried out in the area clinically; in addition, deflection connection between the head and the transition portion is achieved through the rotary connecting portion, the rotary connecting groove and the like, when planting is in place and the through hole rotates to the position where orthodontic ligature wires are not convenient to penetrate, the head can deflect by a certain angle till the through hole is located at the position where the orthodontic ligature wires are convenient to penetrate, and practical application is facilitated.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of dental orthodontic instruments, in particular to an orthodontic micro-implant anchorage nail used in the mandibular buccal shelf area. Background Art

[0002] Micro-implants are widely used in orthodontic clinics because of their small size, flexible and convenient use, and the ability to provide absolute support. However, the shedding of micro-implants after implantation is the most troubling problem for clinicians. At present, the success rate of micro-implants in clinical applications ranges from 70% to 90%. The stress distribution and displacement of the micro-implant-bone interface are important factors affecting the success rate. Uneven stress distribution, excessive stress concentration area, and increased displacement are not conducive to the stability of micro-implants. The macroscopic morphology of the length and thread apex angle of the micro-implant will affect the stress distribution and displacement of the micro-implant-bone interface. Some scholars have selected the optimal thread apex angle and length of micro-implants implanted in the jaw based on stress distribution and displacement. Lan Zedong et al. compared the stress distribution of micro-implants with thread apex angles of 60°, 75°, and 120°, and believed that 60° was a more suitable thread apex angle. Liu Xin et al. found that micro-implants with a thread apex angle of 60° and a length of more than 9 mm are suitable for use as support in orthodontic clinics. However, no specific technology specifically for support nails in the mandibular buccal shelf area has been disclosed.

[0003] In addition, the head of the anchorage nail is provided with a through hole for the orthodontic ligature wire to pass through, but during the implantation process of the anchorage nail, the anchorage nail rotates as a whole, and the through hole on the head is very likely to rotate to a position that is inconvenient for passing the orthodontic ligature wire, making it inconvenient to use. Utility Model Content

[0004] The technical solution of the utility model is aimed at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. It mainly provides an orthodontic micro-implant anchorage nail for the mandibular buccal shelf area, which is used to solve the technical problem raised in the above background technology that there is no anchorage nail specifically adapted for the mandibular buccal shelf area and which is not easy to fall off after implantation.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An orthodontic micro-implant anchorage nail for mandibular buccal shelf area comprises a head and a body, wherein the surface of the body is provided with threads; the top angle of the threads is 45°, and the length of the body is 12 mm.

[0007] Furthermore, the maximum diameter of the body is 1.4 mm, the thread height is 0.2 mm, and the thread pitch is 0.6 mm.

[0008] Specifically, a transition portion is provided between the head portion and the body portion, and a width of the transition portion gradually decreases from a side connected to the head portion to a side connected to the body portion.

[0009] Specifically, the head is provided with a through hole for the orthodontic ligature wire to pass through, and the head is provided with an inner groove for traction of a rubber band hanging sleeve along its circumferential side.

[0010] Specifically, the end of the head portion facing away from the body portion is a structure with a smooth transition on the circumference, and a locking groove is provided on the end of the head portion facing away from the body portion.

[0011] Specifically, the outline of the head is a triangle with rounded end angles.

[0012] Furthermore, a clamping groove is provided on one side of the head connecting transition part, so that a rotating connection part for inserting the transition part is formed on the end side of the head, and a rotating connection groove for inserting and deflecting the rotating connection part is provided inside the transition part, and a clamping part adapted to the clamping groove is provided on one side of the transition part connected to the head; the rotating connection groove includes three limiting groove parts for deflecting the three top angles of the rotating connection part respectively.

[0013] Specifically, the deflection angle of the head is 30°-90°.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) The utility model is specifically targeted at the mandibular buccal shelf area. Through three-dimensional finite element experiments, it is found that when anatomical conditions permit, the micro-implant with a length of 12 mm and a body thread vertex angle of 45° has the smallest Von-Mises stress value and displacement value of the bone interface along the long axis of the micro-implant, which is most suitable for application in the mandibular buccal shelf area. The utility model can improve the success rate of the application of micro-implant support nails in the mandibular buccal shelf area by limiting the length and thread vertex angle parameters of the support nail, which is conducive to the clinical development of support nail-related treatment in this area.

[0016] (2) In the optimized scheme of the utility model, a deflection connection between the head and the transition part is realized by a rotating connecting part and a rotating connecting groove. When the implant is in place and the through hole is rotated to a position that is inconvenient to insert the orthodontic ligature, the head can be deflected by a certain angle until the through hole is located at a position that is convenient for inserting the orthodontic ligature. This can solve the problem that during the implantation process of the anchorage nail, the anchorage nail rotates as a whole, and the through hole of the head is very likely to rotate to a position that is inconvenient to insert the orthodontic ligature, making it inconvenient to use.

[0017] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the planar structure of the utility model in the first embodiment;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model in the second embodiment;

[0020] Figure 3 It is a longitudinal cross-sectional view of the connection structure between the head and the transition part in the third embodiment of the present utility model;

[0021] Figure 4 It is a transverse cross-sectional view of the connection structure between the head and the transition part in the third embodiment of the present invention;

[0022] Figure 5 To verify the maximum stress change trend curve of the cheek plate cortical bone in the experiment;

[0023] Figure 6 To verify the trend curve of the maximum displacement of the cheek plate cortical bone in the experiment.

[0024] Reference numerals:

[0025] 1. Thread; 2. Through hole; 3. Inner groove; 4. Snap-fitting groove; 5. Rotating connection portion; 6. Rotating connection groove; 61. Limiting groove portion; 7. Snap-fitting portion; 8. Engaging groove; 10. Head portion; 20. Body portion; 30. Transition portion. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Example 1: Please refer to the attached Figure 1 , an orthodontic micro-implant support nail for the mandibular buccal shelf area, comprising a head, a transition part and a body arranged in sequence; the body surface is provided with a thread, the thread has a vertex angle of 45°, a thread height of 0.2mm, a pitch of 0.6mm, a length of the body 20 of 12mm, and a maximum diameter of the body 20 of 1.4mm; the width of the transition part 30 gradually decreases from the side connected to the head 10 to the side connected to the body 20; the profile of the head 10 is a triangle with rounded end angles, which is used to match the screwdriver when the support nail is implanted; the head 10 is provided with a through hole 2 for the orthodontic ligature wire to pass through; the head 10 is provided with an inner groove 3 along its circumferential side, that is, forming a narrowed neck, which is used to facilitate hanging and traction rubber bands, etc., and is not easy to fall off; and the inner groove 3 is staggered with the through hole 2; the end of the head 10 facing away from the body 20 is a structure with smooth transition on the circumferential side, which can avoid scratching the user's oral tissue.

[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that:

[0031] In this embodiment, please refer to the attached Figure 2 The end of the head 10 facing away from the body 20 is provided with a snap-fitting slot 8 for adapting to a screwdriver with a screwdriver end structure. In the figure, the side line of the transition portion 30 connecting the head 10 is chamfered.

[0032] The rest is the same as the first embodiment.

[0033] Embodiment 3: This embodiment differs from Embodiment 1 in that:

[0034] In this embodiment, please refer to the attached Figure 3 and attached Figure 4 , a clamping groove 4 is provided on one side of the head 10 connected to the transition part 30, so that a rotating connection part 5 for inserting the transition part 30 is formed on the end side of the head 10, and a rotating connection groove 6 for inserting and deflecting the rotating connection part 5 is provided inside the transition part 30, and a clamping part 7 adapted to the clamping groove 4 is provided on one side of the transition part 30 connected to the head 10; the rotating connection groove 6 includes three limiting grooves 61 for deflecting the three vertex angles of the rotating connection part respectively. During the implantation of the support nail, the head 10 rotates first, and the rotating connection part 5 rotates in the rotating connection groove 6 accordingly, until it contacts the end side of the limiting groove 61, so that the transition part 30 and the body 20 can be pushed to rotate, and the support nail is implanted; when the implantation is in place, the through hole 2 is very likely to rotate to a position that is not convenient for inserting the orthodontic ligature. At this time, the head 10 can be rotated in the opposite direction so that the through hole 2 is located at a position that is convenient for inserting the orthodontic ligature. The deflection angle of the head is 30°-90°.

[0035] The following vertex angle and anchor nail body length parameter design advantages of the solution provided by the present invention are verified:

[0036] Through three-dimensional finite element experiments, 35 micro-implant-mandibular three-dimensional finite element models were established with thread apex angles of 30°, 45°, 60°, 75°90°, 105°, and 120°, and lengths of 8mm, 9mm, 10mm, 11mm, and 12mm, respectively. The micro-implant implantation angle was 90°. The mesial and distal surfaces of the mandible were constrained, and a force parallel to the bone surface was loaded with a force value of 120gf. The Von-Mises stress values ​​and displacement values ​​of the bone interface along the long axis of the micro-implant were analyzed for the 35 micro-implant models under different thread apex angles and micro-implant lengths. The results are shown in the figure. Figure 5 and Figure 6 shown.

[0037] Depend on Figure 5 and Figure 6 It can be seen that the maximum stress value comes from the micro-implant with a thread apex angle of 105° and a length of 8mm; the minimum stress value comes from the micro-implant with a thread apex angle of 45° and a length of 12mm. The overall trend is that with the increase of the length of the micro-implant, the maximum stress value of the micro-implant in the mandibular buccal shelf area tends to decrease. With the increase of length, the maximum displacement value of the micro-implant bone interface with various thread apex angles tends to decrease. Finally, it is concluded that it is recommended to use micro-implants with a length of more than 10mm in the mandibular buccal shelf area. Except for 120°, the other thread apex angles have little effect on the maximum stress value of the surrounding bone interface. When anatomical conditions permit, micro-implants with a length of 12mm and a thread apex angle of 45° are most suitable for application in the buccal shelf area.

[0038] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An orthodontic micro-implant anchorage nail for mandibular buccal shelf area, comprising a head (10) and a body (20), wherein the surface of the body (20) is provided with a thread (1); characterized in that: The top angle of the thread (1) is 45°, and the length of the body (20) is 12 mm; A transition portion (30) is provided between the head portion (10) and the body portion (20), and the width of the transition portion (30) gradually decreases from a side connected to the head portion (10) to a side connected to the body portion (20); The head (10) is provided with a through hole (2) for the orthodontic ligature wire to pass through, and the head (10) is provided with an inner groove (3) for the traction rubber band hanging sleeve along its circumference; The outline of the head (10) is a triangle with rounded end angles.

2. The orthodontic micro-implant anchorage nail for mandibular buccal shelf area according to claim 1, characterized in that: The maximum diameter of the body (20) is 1.4 mm, the height of the thread (1) is 0.2 mm, and the pitch is 0.6 mm.

3. An orthodontic micro-implant anchorage nail for mandibular buccal shelf area according to claim 1 or 2, characterized in that: A clamping groove (4) is provided on one side of the head (10) connected to the transition part (30), so that a rotating connection part (5) for inserting the transition part (30) is formed on the end side of the head (10); a rotating connection groove (6) is provided inside the transition part (30) for the rotating connection part (5) to be inserted and deflected; a clamping part (7) adapted to the clamping groove (4) is provided on one side of the transition part (30) connected to the head (10); the rotating connection groove (6) includes three limiting groove parts (61) for respectively deflecting three vertex angles of the rotating connection part.

4. The orthodontic micro-implant anchorage nail for mandibular buccal shelf area according to claim 3, characterized in that: The deflection angle of the head (10) is 30°-90°.

5. The orthodontic micro-implant anchorage nail for mandibular buccal shelf area according to claim 1 or 2, characterized in that: The end of the head (10) facing away from the body (20) is a structure with a smooth transition around the circumference, and a locking groove (8) is provided on the end of the head (10) facing away from the body (20).

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