Molar anchorage conversion appliance

Abstract

The application belongs to the technical field of dental instruments, and particularly relates to a molar anchorage conversion appliance, which comprises a first connecting crown, a second connecting crown, a connecting rod, a third connecting crown, a molar distal movement assembly and a lingual rod; the first connecting crown is installed on the first bicuspid tooth, the second bicuspid tooth and the first molar on the left side of the upper jaw or the lower jaw; the second connecting crown is installed on the first bicuspid tooth, the second bicuspid tooth and the first molar on the right side of the upper jaw or the lower jaw; the first connecting crown and the second connecting crown are connected through the connecting rod; the third connecting crown is installed on the second molar and the third molar; the molar distal movement assembly comprises a first base, a second base and a telescopic adjusting piece installed between the first base and the second base. The application can realize conversion of moving teeth to anchorage teeth, maximally increase the number of anchorage teeth, and orthodontically correct class Ⅱ and class Ⅲ functional malocclusions of adults without tooth extraction, enamel removal and anchorage nail striking.

Description

Technical Field

[0001] This invention belongs to the technical field of dental instruments, specifically relating to a molar anchorage conversion orthodontic appliance. Background Technology

[0002] Molar distalization in adults is a challenging issue in orthodontic work. Historically, fixed orthodontics has involved intraoral fixed functional correction, initially using first molar bands and extraoral traction to correct molar distalization during puberty. Mid-term advancements included the 4th and 6th molar band fixation invented by Horryfield, the piston distalizer, and more recently, the improved third-generation molar actuator. In adults, anchorage screws are required to enhance anchorage. Insufficient anchorage is a key factor in molar distalization in adults.

[0003] Therefore, the large anchorage structure of the orthodontic appliance is the basis for pushing the molars backward. Summary of the Invention

[0004] The purpose of this invention is to provide a molar anchorage conversion orthodontic appliance that overcomes the problem of insufficient traditional anchorage. It is reasonably designed and can orthodontically correct Angle Class II and III functional malocclusions in adults without tooth extraction, enamel removal, or anchorage screws. This invention has low manufacturing cost and is suitable for widespread use.

[0005] The technical solution of this invention is as follows:

[0006] A molar anchorage conversion appliance includes a first crown, a second crown, a connecting rod, a third crown, a molar distalization component, and a lingual rod;

[0007] The first crown is installed on the first premolar, second premolar, and first molar on the left side of the maxilla or mandible; the second crown is installed on the first premolar, second premolar, and first molar on the right side of the maxilla or mandible; the first crown and the second crown are connected by the connecting rod.

[0008] The third crown is installed on the second and third molars; the molar distalization assembly includes a first base, a second base, and a telescopic adjustment member installed between the first base and the second base, the telescopic adjustment member being used to adjust the distance between the first base and the second base; the first crown or the second crown is fixedly installed on the buccal side of the first molar, and the second base is fixedly installed on the buccal side of the third crown.

[0009] As a further embodiment of the present invention, the third crown is fixed with a lingual tube on the lingual side of the first molar, the lingual tube being a blind tube with one end open and the other end closed; the first crown or the second crown is fixed with a bracket on the lingual side of the second premolar, and the lingual rod can be placed inside the bracket and the lingual tube.

[0010] As a further embodiment of the present invention, the first or second crown is provided with a fixing post on the lingual side of the first premolar, and a collar is provided at one end of the lingual bar, the collar being able to be fitted onto the fixing post.

[0011] As a further embodiment of the present invention, the telescopic adjustment member includes a bidirectional screw and an adjustment wheel disposed on the bidirectional screw. The two ends of the bidirectional screw are respectively threaded to the first base and the second base, and the adjustment wheel is provided with an adjustment groove.

[0012] As a further embodiment of the present invention, the molar distalization assembly further includes a guide shaft, and through holes are provided at the ends of the first base and the second base, and the guide shaft is slidably connected to the through holes.

[0013] As a further embodiment of the present invention, there are two guide shafts, which are located on the upper and lower sides of the telescopic adjustment member and are arranged in parallel. The two guide shafts are connected end to end by an arc-shaped connector.

[0014] As a further embodiment of the present invention, the first crown and the second crown are made of plastic steel or resin material and are configured as a mesh.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] 1. The first and second crowns of the present invention are respectively fixed on the first premolar, the second premolar, and the first molar on the same side of the maxilla or mandible, and the first and second crowns are connected by the connecting rod, so that the 12 teeth form a whole and form a strong anchorage, overcoming the problem of insufficient traditional anchorage. There is no need to implant intraoral anchorage screws or install extraoral anchorage components. With the cooperation of the molar distalization component, the posterior displacement of the second and third molars can be achieved.

[0017] 2. The molar distalization assembly is equipped with a telescopic adjustment mechanism that can widen or narrow the distance between the first base and the second base. Through the cooperation of the lingual rod, the anchorage conversion is completed. Specifically, using the dentition consisting of the first crown and the second crown as the anchorage, the distance between the first base and the second base is widened, which can push the second molar and the third molar backward. After completion, one end of the lingual rod is inserted into the lingual tube, and the collar of the other end is fitted onto the fixed post. The middle part of the lingual rod is placed in the bracket, tied with ligature wire, and fixed with self-curing resin. At the same time, the crown mesh between the first molar and the second premolar in the first crown (or the second crown) is removed, so that the crown of the first molar is separated from the first crown (or the second crown). Then, the distance between the first base and the second base is narrowed by the telescopic adjustment mechanism, which causes the first molar to move towards the second molar.

[0018] 3. The invention is reasonably designed and can orthodontically correct Angle Class II and III functional malocclusions in adults without tooth extraction, enamel removal, or anchorage screws. The invention has low manufacturing cost and is suitable for widespread use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the operation of the present invention in driving the second and third molars;

[0020] Figure 2 This is a schematic diagram illustrating the operation of the present invention in pushing the first molar;

[0021] Figure 3 This is a schematic diagram of the molar distalization component of the present invention;

[0022] Figure 4 This is a schematic diagram of the tongue-side rod of the present invention.

[0023] Figures 1 to 4 The attached figures are numbered as follows: 1. First crown; 2. Second crown; 3. Connecting rod; 4. Lingual rod; 41. Collar; 5. Third crown; 6. Lingual tube; 7. Molar distalization assembly; 71. Telescopic adjustment component; 711. Bidirectional screw; 712. Adjusting wheel; 72. First base; 73. Second base; 74. Guide shaft; 75. Arc-shaped connector; 8. Bracket; 9. First premolar; 10. Second premolar; 11. First molar; 12. Fixing post. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-4 As shown, a molar anchorage conversion appliance of this embodiment includes a first crown 1, a second crown 2, a connecting rod 3, a third crown 5, a molar distalization component 7, and a lingual rod 4;

[0026] The first crown 1 is installed on the first premolar 9, second premolar 10 and first molar 11 on the left side of the mandible; the second crown 2 is installed on the first premolar 9, second premolar 10 and first molar 11 on the right side of the mandible; the first crown 1 and the second crown 2 are connected by a connecting rod 3;

[0027] The third crown 5 is installed on the second and third molars; the molar distalization assembly 7 includes a first base 72, a second base 73, and a telescopic adjustment member 71 installed between the first base 72 and the second base 73, the telescopic adjustment member 71 being used to adjust the distance between the first base 72 and the second base 73; the first crown 1 and the second crown 2 are fixedly installed on the buccal side of the first molar 11, the first base 72 is fixedly installed, and the second base 73 is fixedly installed on the buccal side of the third crown 5.

[0028] Since the first crown 1 (second crown 2) is fixed on the first premolar 9, second premolar 10 and first molar 11 on the same side of the maxilla or mandible, and the first crown 1 and the second crown 2 are connected by the connecting rod 3, the 12 teeth form a whole, forming a strong anchorage, which overcomes the problem of insufficient traditional anchorage. There is no need to implant intraoral anchorage screws or install extraoral anchorage components. With the cooperation of the molar distalization component 7, the posterior displacement of the second molar and the third molar can be achieved.

[0029] In this embodiment, a lingual tube 6 is fixed to the lingual side of the third crown 5. The lingual tube 6 is a blind tube with one end open and the other end closed. A bracket 8 is fixed to the lingual side of the first crown 1 (second crown 2) at the second premolar 10, and the lingual rod 4 can be placed in the bracket 8 and the lingual tube 6. A fixing post 12 is provided on the lingual side of the first crown 1 (second crown 2) at the first premolar 9, and a collar 41 is provided at one end of the lingual rod 4, which can be fitted onto the fixing post 12.

[0030] After the second and third molars have been distalized, one end of the lingual bar 4 is inserted into the lingual tube 6, and the collar 41 at the other end is fitted onto the fixed post 12. The middle part of the lingual bar 4 is placed in the bracket 8, tied with ligature wire, and fixed with self-curing resin. At the same time, the crown mesh between the first molar 11 and the second premolar 10 in the first crown 1 (second crown 2) is removed, so that the crown of the first molar 11 is separated from the first crown 1 (second crown 2). At this time, the second molar, the third molar, and the first crown 1 (second crown 2) form a new anchorage (fixed dentition), while the separated first molar 11 becomes a moving tooth. By adjusting the telescopic adjustment member 71 in the opposite direction and reducing the distance between the first base 72 and the second base 73, the first molar 11 can be moved towards the second molar, thus completing the distalization of the first molar 11.

[0031] In this embodiment, the telescopic adjustment member 71 includes a bidirectional screw 711 and an adjustment wheel 712 disposed on the bidirectional screw 711. The two ends of the bidirectional screw 711 are threadedly connected to the first base 72 and the second base 73, respectively. The adjustment wheel 712 is provided with an adjustment groove.

[0032] In use, inserting the rod into the adjustment slot allows the adjustment wheel 712 to be turned. The adjustment wheel 712 drives the bidirectional screw 711 to rotate, thereby applying a force that causes the first base 72 and the second base 73 to move away from or closer to each other, thus opening or closing the gap between the first molar 11 and the second molar.

[0033] In this embodiment, the molar distalization assembly 7 further includes a guide shaft 74. Through holes are provided at the ends of both the first base 72 and the second base 73, and the guide shaft 74 is slidably connected to the through holes. There are two guide shafts 74, located on the upper and lower sides of the telescopic adjustment member 71 and arranged parallel to each other. The two guide shafts 74 are connected end-to-end by an arc-shaped connector 75. By providing the guide shafts 74, the stability of the adjustment of the first base 72 and the second base 73 is improved.

[0034] For ease of installation and cutting, the first crown 1 and the second crown 2 are made of plastic steel or resin material and are set as a mesh.

[0035] Usage procedure: Install the first crown 1, the second crown 2, the connecting rod 3, the third crown 5, and the molar distalization component 7 respectively. Trim the mesh of the first crown 1 and the second crown 2, flatten them with resin, rotate the adjusting wheel 712 on the bidirectional screw 711, rotate it 90 degrees, and increase the occlusal contact with the resin. Follow up after one week.

[0036] One week later, rotate the adjusting wheel 712 twice a day, morning and evening, for a total of 180 degrees each time. After the second and third molars have moved backward to the corrective position, insert one end of the lingual bar 4 into the lingual tube 6 and place the collar 41 at the other end onto the fixed post 12. Place the middle of the lingual bar 4 into the bracket 8, tighten it with ligature wire, and fix it with self-curing resin. At the same time, remove the crown mesh between the first molar 11 and the second premolar 10 in the first crown 1 (second crown 2), so that the crown of the first molar 11 is separated from the first crown 1 (second crown 2), completing the anchorage conversion. At this time, the second molar and the first crown 1 (second crown 2) form a new anchorage (fixed dentition), while the separated first molar 11 becomes a moving tooth. By adjusting the telescopic adjusting member 71 in the opposite direction and reducing the distance between the first base 72 and the second base 73, the first molar 11 can be moved towards the second molar, completing the distalization of the first molar 11. After the molars are distalized, space is created mesially (the functional malocclusion required for anterior orthodontics), allowing the anterior teeth and premolars to be retracted by intermaxillary parallel traction.

[0037] In this invention, the first crown 1 and the second crown 2 are connected by a connecting rod 3, making 12 teeth form a whole and creating strong anchorage. At this time, the third crown 5 consists of 4 movable teeth, with an anchorage tooth to movable tooth ratio of 6:2. After the anchorage is converted using the lingual rod 4, the number of fixed teeth becomes 14, and the number of movable teeth becomes 2 first molars 11, with an anchorage tooth to movable tooth ratio of 7:1. Through the anchorage conversion, under the stable anchorage condition of an anchorage tooth to movable tooth ratio of 6:2 and 7:1, molar distalization is successfully completed.

[0038] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A molar anchorage conversion appliance, characterized in that, It includes the first crown (1), the second crown (2), the connecting rod (3), the third crown (5), the molar distalization assembly (7), and the lingual rod (4); The first crown (1) is installed on the first premolar (9), second premolar (10) and first molar (11) on the left side of the maxilla or mandible; the second crown (2) is installed on the first premolar (9), second premolar (10) and first molar (11) on the right side of the maxilla or mandible; the first crown (1) and the second crown (2) are connected by the connecting rod (3); The third crown (5) is installed on the second and third molars; the molar distalization assembly (7) includes a first base (72), a second base (73) and a telescopic adjustment member (71) installed between the first base (72) and the second base (73), the telescopic adjustment member (71) being used to adjust the distance between the first base (72) and the second base (73); the first crown (1) or the second crown (2) is fixedly installed on the buccal side of the first molar (11) with the first base (72) fixedly installed on the buccal side of the third crown (5); The third crown (5) is fixed with a lingual tube (6) on the lingual side of the first molar (11). The lingual tube (6) is a blind tube with one end open and the other end closed. The first crown (1) or the second crown (2) is fixed with a bracket (8) on the lingual side of the second premolar (10). The lingual bar (4) can be placed in the bracket (8) and the lingual tube (6). The first crown (1) or the second crown (2) is provided with a fixed post (12) on the lingual side of the first premolar (9), and a collar (41) is provided at one end of the lingual bar (4), which can be fitted onto the fixed post (12).

2. The molar anchorage conversion appliance according to claim 1, characterized in that: The telescopic adjustment member (71) includes a bidirectional screw (711) and an adjustment wheel (712) disposed on the bidirectional screw (711). The two ends of the bidirectional screw (711) are threadedly connected to the first base (72) and the second base (73) respectively. The adjustment wheel (712) is provided with an adjustment groove.

3. The molar anchorage conversion appliance according to claim 1, characterized in that: The molar distalization assembly (7) also includes a guide shaft (74), and the ends of the first base (72) and the second base (73) are provided with through holes, and the guide shaft (74) is slidably connected to the through holes.

4. The molar anchorage conversion appliance according to claim 3, characterized in that: There are two guide shafts (74), which are located on the upper and lower sides of the telescopic adjustment member (71) and are arranged in parallel. The two guide shafts (74) are connected end to end by an arc-shaped connector (75).

5. The molar anchorage conversion appliance according to claim 1, characterized in that: The first crown (1) and the second crown (2) are made of plastic steel or resin material and are set as mesh.

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