CN112043426A - Periodontal ligament stretching osteogenesis mesial moving molar device and correction method - Google Patents

Abstract

The invention discloses a device for stretching a bone-forming mesial moving molar by a periodontal ligament, which comprises a first band ring arranged on a molar or a premolar in the mesial of an edentulous area and a second band ring arranged on a molar needing mesial moving, wherein the first band ring and the second band ring are connected through a spiral stretching device, the spiral stretching device is arranged on the buccal side of the tooth, and the spiral stretching device comprises a first buccal slide block, a spiral rod, a nut, a second buccal slide block and a buccal slide rod; the first tongue side sliding block and the second tongue side sliding block are arranged on the tooth tongue side; the first tongue side sliding block and the second tongue side sliding block are connected through a tongue side sliding rod and an elastic device. The invention solves the problems of the prior art that the molar deflects and inclines when the molar moves near and in a long distance.

Description

A device and orthodontic method for moving molars by distraction osteogenesis of periodontal ligament

technical field

The invention relates to the technical field of oral medical treatment, in particular to a device and a rectification method for moving molars in the middle of periodontal ligament distraction osteogenesis.

Background technique

Clinically, patients with missing mandibular first or second molars due to caries and trauma are common. Figure 1 shows a schematic diagram of missing mandibular first or second molars. At present, the main solutions include implant restoration and crown bridge restoration. The third molars still exist, and the molars can also be moved mesially through orthodontics to replace the second molars with the third molars and the first molars with the second molars. The cost of implant treatment is high, and the patient bears unnecessary risks of implant surgery; crown and bridge restoration requires grinding of healthy tooth tissue, and the chewing function is not as good as normal teeth. In most patients, the third molars still exist, which can replace the missing teeth to play a normal chewing function and are more aesthetically pleasing.

There are four main ways to move teeth:

1) Arch wire + rubber chain: As shown in Figures 2 and 3, the molars are moved along the middle of the arch wire by the pulling force of the buccal and lingual rubber chain. This method is suitable for small distance movement of molars, and is prone to mesial inclination of molars, which also has side effects on premolars.

2) Rubber chain + micro-implant nails: As shown in Figures 4 and 5, one end of the rubber chain is hung on the micro-implant nails, and the other end is attached to the molars that need to be moved proximally, and the molars are exerted and pulled through the rubber chain. This method avoids unnecessary movement of the premolars, but the treatment time is longer and the mesially moved molars may experience root resorption.

3) Rubber chain + continuous ligation: As shown in Figure 6, the molar is pulled by the rubber chain on the buccal and lingual side. Once the molar is tilted mesally, the ligation wire is replaced with the rubber chain, and the molar is kept upright and the rubber chain is used to move the molar mesially. molar. Continuous ligation connects other teeth as a whole to provide strong anchorage. This method takes too long for orthodontic treatment and is prone to root resorption. The molars tend to tilt during the mesial movement, which also has side effects on other anchoring teeth.

4) Slide bar + tension spring + micro-implant nail: As shown in Figure 7, one end of the buccal tension spring is fixed with the implant nail, and the other end is added to the molar that needs to be moved mesally to provide continuous tension. The molars slide along the tongue bar. This method provides strong anchorage, but during the mesial movement of the molars, mesial tilt and mesial rotation of the molars will occur, and the lingual sliding rod is easily stuck, hindering the mesial movement of the molars. Moreover, the treatment time of this scheme is long, and root resorption is prone to occur.

To sum up, the current appliances and orthodontic methods have the following main drawbacks:

1. If the treatment time is too long, it is easy to cause root absorption;

2. The mesial moving molars are mostly inclined movements, which are prone to mesial inclination of the crown and mesial rotation, which is not conducive to the transmission of force along the long axis of the tooth and is not conducive to periodontal health;

3. Difficulty moving molars for long distances;

4. Some methods use other anchorage teeth as anchorage, which will cause unnecessary tooth movement and inclination;

5. The height of the alveolar bone of the mesially moving molars is insufficient, which is not conducive to periodontal health.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a device for mesial moving molars by periodontal ligament distraction osteogenesis and its orthodontic method, aiming to solve the problem of deflection and inclination of molars caused by long-distance mesial moving molars in the prior art.

The technical scheme adopted in the present invention is: a device for moving molars in the middle of periodontal ligament distraction and osteogenesis, comprising a first belt ring and a second belt ring, the first belt ring is used to be sleeved near the tooth-missing area On the molars or premolars on the middle side, the second belt ring is used to be sleeved on the molars that need to move mesially, the first belt ring and the second belt ring are connected by a helical stretcher, and the helical stretcher The helical retractor is fixedly arranged on the buccal side of the first and second belt loops, the helical retractor includes a first buccal slider and a second buccal slider, the first buccal slider and The second buccal sliders are connected by a screw rod and a buccal slider, the screw rod is provided with a nut; it also includes a first lingual slider and a second lingual slider arranged on the lingual side of the teeth ; The first lingual sliding block and the second lingual sliding block are connected by a lingual sliding rod and an elastic device.

Further, the first buccal slider and the first lingual slider are fixedly connected to both sides of the first belt ring, and the second buccal slider and the second lingual slider are fixedly connected to the same. on both sides of the second belt loop.

Further, the first lingual slider is provided with a first pull hook, the second lingual slider is provided with a second pull hook, and both ends of the elastic device are hung on the first pull hook and the second pull hook.

Further, the elastic device is a tension spring and a chain rubber ring.

Further, the nut is provided with a screw hole for adjusting the nut, and two sides of the nut are respectively provided with screw rods with opposite directions of rotation.

Further, only one end of the buccal slider is fixedly connected with the first buccal slider or the second buccal slider, and only one end of the lingual slider is connected with the second lingual slider or the first lingual slider. Slider fixed connection.

Further, in the mesial area of the molars that need to move mesally, a first anchoring device is also provided between the premolars to provide anchoring force for the helical distractor, and the first buccal slider is connected to all the molars through the traction member. The first anchorage device is rigidly connected.

Further, the traction member is a stainless steel wire or a ligation wire.

Further, there is also a second anchorage device, one end of the second anchorage device is fixedly connected with the first belt ring, and the joint action of the first anchorage turntable control further restricts the molars from inclining and moving during movement. deflection.

Further, the second anchorage device includes a third band loop, a lingual arch and a fourth band loop, the third band loop is sleeved on the distraction side premolar, and the fourth band ring is sleeved on the opposite side. On the lateral premolars, the third belt loop and the fourth belt loop are connected through the lingual arch, and the lingual arch is located on the lingual eminence of the lower anterior teeth.

Further, the third band loop is wrapped around at least one premolar on the distraction side, the fourth band loop is wrapped around at least one premolar on the opposite side, and the third band loop is connected to the first band. Ring fixed connection.

Also provided is a method for correcting the mesial movement of molars, the steps of which are as follows:

a. Obtain the three-dimensional data of the oral dentition model;

b. Making the aforementioned device for mesial movement of molars;

c. Do alveolar bone cancellectomy in the mesial alveolar bone of the molar;

d. Wear and fix the device for the mesial movement of molars;

e. Adjust the rate of periodontal ligament distraction osteogenesis, perform periodontal ligament distraction osteogenesis, and move molars mesially.

Further, in the step b, according to the acquired alveolar bone and root data and the model obtained by intraoral scanning or alginate casting, a device for molar mesial movement is fabricated;

In the step c, plant the first anchorage device and/or the second anchorage device as needed;

And in the step e, the rate of distraction osteogenesis is determined according to the number of molar roots that need to move mesially.

Compared with the prior art, the present invention has at least the following technical effects:

(1) Compared with implant restoration and crown bridge restoration, this method replaces the second molar with the patient's natural teeth, maximizes the use of natural teeth to restore the function of the missing teeth, and avoids the risk of implant surgery / grinding of healthy tooth tissue ;

(2) The method provides strong anchorage through micro-implantation nails, and provides reinforced anchorage through the third belt ring, the fourth belt ring and the lingual arch, and has no side effects on the adjacent teeth;

(3) Cooperate with cancellectomy to reduce bone resistance, greatly reduce the treatment time, less prone to root resorption, and no damage to the pulp;

(4) Using the principle of periodontal ligament distraction osteogenesis, the molars can be moved as a whole over a long distance, which greatly reduces the difficulty of proximal molar movement;

(5) There is continuous bone formation in the process of distraction osteogenesis, and the alveolar bone recovers well, which is beneficial to periodontal health;

(6) Local orthodontic treatment is possible, involving only missing lateral molars or second premolars, without full-mouth arch wires, which can shorten the treatment time and save the treatment cost;

(7) The device is machined and cast, with few follow-up operations, short time and high comfort;

(8) The device is independently augmented by the patient, with high patient participation and good compliance;

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments of the present invention or the prior art. Obviously, the drawings described below are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Figure 1 is a schematic view of the missing mandibular second molar;

Fig. 2 is the schematic diagram of the archwire pulling mode in the prior art;

Fig. 3 is the schematic diagram of the archwire pulling mode in the prior art;

Fig. 4 is the schematic diagram of rubber chain+micro-planting nail mode in the prior art;

Fig. 5 is the schematic diagram of the premolar region implant nail+push spring mode in the prior art;

Fig. 6 is the schematic diagram of rubber chain+continuous ligation mode in the prior art;

Fig. 7 is the schematic diagram of slide bar+tension spring+micro-planting nail mode in the prior art;

8 is a schematic view of the buccal installation of the device for moving molars of the present invention;

9 is a schematic view of the lingual structure of the device for moving molars of the present invention;

10 is a schematic diagram of the device for moving molars of the present invention along the axial direction of the screw;

11 is a buccal schematic view of the second anchorage device of the device for moving molars of the present invention;

12 is a lingual schematic view of the second anchorage device of the device for moving molars of the present invention;

13 is a schematic view of the occlusal side of the second anchorage device of the device for moving molars of the present invention;

Figure 14 is a flow chart of the method of moving teeth of the present invention.

Description of reference numbers:

1 Fastener 2 first buccal slider 3 screw rod 4 nut 5 second buccal slider 6 first belt loop 7 Buccal Slider 8 second belt loop 9 Retractor two 10 elastic device 11 hook one 12 second lingual slider 13 first lingual slider 14 lingual slider 15 Spiral hole 16 first support device 17 second anchorage device 18 third belt loop 19 tongue arch 20 Fourth belt loop

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

The periodontal ligament distraction osteogenesis mobile mesial molar device adopted in the present invention is a device that utilizes the periodontal ligament distraction osteogenesis principle, cooperates with cancellectomy, and uses the inter-root micro-implantation nails of the premolars and the contralateral tooth anchorage. , a device for long-distance integral mesial movement of molars to replace missing molars.

Specifically, as shown in FIGS. 8-10 , a device for moving molars in the middle includes a first belt ring 6 and a second belt ring 8 , and the first belt ring 6 is used to be sleeved on the mesial side of the edentulous area. On the molars or premolars, the second band ring 8 is used to be sleeved on the molars that need mesial movement, and is assisted by adhesive to fix, preferably, the first band ring 6 is arranged on the mesial side of the missing tooth. On the molars or premolars, the second belt ring 8 is arranged on the molars; the helical stretcher is fixedly arranged on the buccal side of the first belt ring 6 and the second belt ring 8, in order to facilitate the adjustment of the helical stretcher And make the helical distractor have a larger adjustment range, so the helical distractor is preferentially arranged on the buccal side of the tooth, and the helical distractor is used to provide traction for distraction osteogenesis; the helical distractor includes the first A buccal slider 2 and a second buccal slider 5, the first buccal slider 2 is fixedly connected with the first belt ring 6, the second buccal slider 5 is fixedly connected with the second belt ring 8, the A buccal slider 2 and a second buccal slider 5 are connected by a screw rod 3 and a buccal slider 7, and the screw rod 3 is provided with a nut 4 for adjusting the screw rod 3; on the first buccal side The slider 2 and the second buccal slider 5 are respectively provided with a threaded hole and a smooth hole, the threaded hole is used to connect the screw rod 3, and the smooth hole is used to connect the buccal sliding rod 7; it also includes a threaded hole arranged on the lingual side of the tooth. The second lingual slider 12 and the first lingual slider 13; the second lingual slider 12 and the first lingual slider 13 are connected by a lingual slider 14, and the second lingual slider 12 and the first lingual slider 13 is provided with a light hole for connecting the lingual slider 14, an elastic device 10 is also connected between the second lingual slider 12 and the first lingual slider 1, and the second lingual slider 12 is connected to the first lingual slider 1. The lower parts of the side slider 12 and the first lingual slider 1 are also provided with hooks for connecting the elastic device 10 .

The first buccal slider 2 and the first lingual slider 13 are fixedly connected on both sides of the first belt ring 6 , and the second buccal slider 5 and the second lingual slider 12 are fixedly connected on both sides of the second belt loop 8 . First buccal slider 2, first lingual slider 13, second buccal slider 5, second lingual slider 12, first belt ring 6, second belt ring 8, screw rod 3, nut 4 Made of one or more of stainless steel, cobalt-chromium alloy or nickel-titanium alloy.

The second lingual slider 12 is provided with the second hook 9, the first lingual slider 13 is provided with the first hook 11, the two ends of the elastic device 10 are hung on the second hook 9 and the first hook 11, the molars are The hook is a right-angle hook or an arc hook. The elastic device 10 is preferably a tension spring, which can assist in applying tension, so that the tension on the buccal and lingual sides is basically equal, so as to prevent the molars from mesial rotation during proximal movement and being caught by the lingual sliding rod.

As shown in FIG. 8 , the nut 4 is provided with a screw hole 15, and two sides of the nut 4 are respectively provided with screw rods 3 with opposite directions of rotation. 3 or the non-adjustable movement of the nut 4, insert the adjusting rod into the screw hole 15, rotate the nut 4 at a certain rate, and then realize the screw rod 3 to drive the first buccal slider 2 and the second buccal slider 5 to move, so as to realize the screw Precise adjustment of the traction force of the stretcher. When the first buccal slider 2 is rigidly connected with the implant nail, only the second buccal slider 5 moves to the missing tooth side.

As shown in FIG. 10 , only one end of the buccal slider 7 is fixedly connected to the first buccal slider 2 or the second buccal slider 5 , and only one end of the lingual slider 14 is connected to the second lingual slider. The sliding block 12 or the first lingual side sliding block 13 is fixedly connected, and specifically, an interference connection can be adopted. During the pulling force of the screw distractor, the lingual sliding rod 14 makes the molar move forward along the set direction, which can avoid the inclination and mesial rotation of the molar.

In order to reduce the weight of the device, the buccal sliding rod 7 and the lingual sliding rod 14 can be made of non-metallic materials, which can play a guiding role. In order to further ensure that the moving direction of the device is not inclined or deflected, the cross-sectional shapes of the buccal sliding rod 7 and the lingual sliding rod 14 are circular.

As shown in FIG. 8 , a first anchorage device 16 is also provided in the root area on the side away from the molars and premolars, which is used to provide anchorage force for the helical distractor. The setting of the first anchorage device 16 ensures that the molars are facing Moving in the direction of an anchorage device 16, the first buccal slider 2 is rigidly connected to the first anchorage device 16 through a fixing member 1, and the first buccal slider 2 is provided with a fixing member 1 For the connected traction hook, the first anchorage device 16 may be an orthodontic first anchorage device such as a micro-implant nail, a titanium nail, a titanium plate, or the like.

The fixing member 1 is a fixed stainless steel wire or a fixed ligation wire. The fixing member 1 is sleeved or hooked on the first anchorage device 16 to provide strong anchorage and prevent anchorage teeth from moving to the missing tooth side.

As shown in FIGS. 11-13 , there is also a second anchorage device 17 , and one end of the second anchorage device 17 is fixedly connected to the first belt ring 6 . The second anchorage device 17 is a reinforcing anchorage device, which cooperates with the first anchorage device 16 to further limit the movement of the anchoring teeth to the edentulous area.

Further, the second anchorage device 17 includes a third belt loop 18, a lingual arch 19 and a fourth belt loop 20, the third belt loop 18 is sleeved on the premolar on the distraction side, and the fourth belt The ring 20 is sleeved on the opposite side premolar, and the third belt ring 18 and the fourth belt ring 20 are connected through the lingual arch 19, and the lingual arch 19 is located on the lingual eminence of the lower anterior teeth. The third belt loop 18, the lingual arch 19 and the fourth belt loop 20 are made of one or more of stainless steel, cobalt-chromium alloy or nickel-titanium alloy.

Further, the third band loop 18 wraps around at least one premolar on the distraction side, the fourth band loop 20 wraps around at least one premolar on the opposite side, and the third band loop 18 and The first belt loop 6 is fixedly connected.

When in use, the first belt loop 6 , the second belt loop 8 , the third belt loop 18 and the fourth belt loop 20 are inserted into the corresponding tooth positions and fixed with adhesive. The first buccal slider 2 of the premolar is fixedly connected with the first anchorage device 16 through stainless steel wire or ligation wire, and is fixedly connected through the third band ring 18 and the second anchorage device 17, and the adjustment key is inserted into the buccal helical distractor In the screw hole 15, screw at a certain rate, the length of the screw rod 3 is shortened, and the corresponding molars can be pulled to slide along the buccal sliding rod 7 and the lingual sliding rod 14 on the buccal and lingual side. , the tension spring on the tongue side can assist the force.

Figure 14 also provides a method for orthodontic treatment using the above-mentioned molar mesial moving device to move molars, the steps of which are as follows:

a. Obtain the three-dimensional data of the oral dentition model;

b. Making the aforementioned device for mesial movement of molars, specifically making a device for mesial movement of molars according to the acquired alveolar bone and root data and the model obtained by intraoral scanning or alginate casting;

c. Perform alveolar bone cancellectomy on the mesial alveolar bone of the molar, and implant the first anchorage device and/or the second anchorage device as needed;

d. Wear and fix the device for the mesial movement of molars;

e. Adjust the rate of periodontal ligament distraction osteogenesis, perform periodontal ligament distraction osteogenesis, and move molars mesially.

Among them, in order to determine whether the patient is suitable for the molar moving method of the present invention, it is necessary to obtain the patient's missing molar state before treatment, and determine whether the patient meets the indications for the treatment, such as the first molar or the second molar is missing, and the third molar is missing, and the third molar is missing. If the root length is normal and the root bifurcation is small, the present invention can be used for orthodontic treatment;

specifically:

In step a, the model is mainly obtained by scanning the patient's mouth, and the panoramic film and oral CBCT are taken;

In step b, it is also necessary to try on the prepared mobile molar device in the patient's mouth to ensure that it is in good position and the force is applied smoothly.

In step c, the buccal and lingual extent and depth of alveolar cancellous bone resection are designed according to the examination results of CBCT, and cancellous alveolar bone resection is performed on the mesial alveolar bone of the molar that needs mesial movement, and the retention Buccal and lingual and palatal bone plates were sutured, and implants were placed in the corresponding locations as needed. If it is judged that the first anchorage device 16 does not need to be implanted, this step can be omitted; with cancellectomy, the bone resistance can be reduced, the overall mesial movement of the molars can be realized over a long distance, the tooth movement rate can be accelerated, and the orthodontic treatment can be greatly reduced. time, and root resorption is not easy to occur.

At the same time, the first anchorage device 16 and the second anchorage device 17 and the implantation site are selected according to the needs. Specifically, the first anchorage device 16 and the second anchorage device 17 can be used at the same time, or only one anchorage among them can be used. In this way, the first anchorage device 16 provides a strong anchorage, and the second anchorage device 17 serves as a further strengthening anchorage, which has no adverse effect on the adjacent teeth. If it is judged that the anchorage device is not required to be implanted, this step can be omitted.

In step d, after the patient's surgical wound is healed a week later, the periodontal ligament distraction osteogenesis device is inserted into the patient's mouth, bonded with orthodontic adhesive, and a tension spring is added on the lingual side as needed; The deformed adhesive is glass ionomer adhesive or blue glue adhesive;

In step e, the periodontal ligament stretch rate is determined according to the number of molar roots that the patient needs to move mesally, and the device for moving the molars is adjusted according to the stretch rate. The device can be adjusted by the patient's voluntary force, with high patient participation and good compliance. During the process of distraction osteogenesis, there is continuous bone formation, and the alveolar bone recovers well, which is beneficial to periodontal health.

By using the tooth moving method of the present invention, compared with implant restoration and crown bridge restoration, the method replaces the missing molars with the patient's natural teeth, restores the function of the missing teeth to the greatest extent, and avoids the risk of implant surgery/healthy dental tissue Grinding; this method provides strong anchorage through micro-implantation nails, and provides enhanced anchorage through the third belt ring, fourth belt ring and hyoid arch, and has no side effects on adjacent teeth; in conjunction with cancellectomy, it reduces bone resistance and greatly reduces bone resistance. Reduces the treatment time, is less prone to root resorption, and does not damage the pulp; uses the principle of periodontal ligament distraction osteogenesis to move the molars as a whole over a long distance, greatly reducing the difficulty of proximal molar movement; Bone formation continues during the process of distraction osteogenesis , the alveolar bone recovers well, which is beneficial to the periodontal health; it can be partially corrected, only involving the teeth on both sides of the edentulous area, without the need for full-mouth arch wires, which can shorten the treatment time and save the treatment cost. The device is machined and cast, with few follow-up operations, short time and high comfort; the device is empowered by the patient independently, with high patient participation and good compliance.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (13)

1. A device for periodontal ligament distraction osteogenesis mesial moving molar, comprising a first band (6) and a second band (8), wherein the first band (6) is used for sleeving on a molar or an premolar on the mesial side of an edentulous area, the second band (8) is used for sleeving on a molar needing mesial moving, the first band (6) and the second band (8) are connected through a spiral distractor, characterized in that the spiral distractor is fixedly arranged on the buccal side of the first band (6) and the second band (8), the spiral distractor comprises a first buccal slider (2) and a second buccal slider (5), the first buccal slider (2) and the second buccal slider (5) are connected through a spiral rod (3) and a buccal slider (7), and a nut (4) is arranged on the spiral rod (3); the tongue-shaped belt is characterized by further comprising a first tongue-shaped side sliding block (13) arranged on the tongue surface side of the first belt ring (6), and a second tongue-shaped side sliding block (12) arranged on the tongue surface side of the second belt ring (8); the second tongue-side sliding block (12) is connected with the first tongue-side sliding block (13) through a tongue-side sliding rod (14) and an elastic device (10).

2. The device for periodontal ligament distraction osteogenesis mesial mobile molar according to claim 1, wherein the first buccal slider (2) and the first lingual slider (13) are fixedly attached to both sides of the first band (6), and the second buccal slider (5) and the second lingual slider (12) are fixedly attached to both sides of the second band (8).

3. The device for periodontal ligament distraction osteogenesis mesial mobile molar according to claim 2, wherein the first lingual slider (13) is provided with a first draw hook (11), the second lingual slider (12) is provided with a second draw hook (9), and two ends of the elastic device (10) are hung on the first draw hook (11) and the second draw hook (9).

4. A device for periodontal ligament distraction osteogenesis mesial mobile molar according to claim 3, wherein said elastic means (10) is a tension spring or a chain rubber band.

5. Device for periodontal ligament distraction osteogenesis mesial mobile molars according to any of claims 1 to 4, wherein said nut (4) is provided with a screw hole (15) for adjusting the nut, and said nut (4) is provided with screw rods (3) with opposite directions of rotation on both sides.

6. The device for periodontal ligament distraction osteogenesis mesial mobile molar according to claim 3, wherein only one end of the buccal slide bar (7) is fixedly connected to the first buccal slider (2) or the second buccal slider (5), and only one end of the lingual slide bar (14) is fixedly connected to the second lingual slider (12) or the first lingual slider (13).

7. Device for periodontal ligament distraction osteogenesis mesial mobile molar according to claim 2, characterized in that it is further provided with a first anchorage means (16) providing an anchorage force to the helical distractor, said first buccal slider (2) being rigidly connected to said first anchorage means (16) by means of a fixture (1).

8. The device for periodontal ligament distraction osteogenesis mesial mobile molars according to claim 7, wherein said fixture (1) is a stainless steel wire or a ligature wire.

9. The device for periodontal ligament distraction osteogenesis mesial mobile molars according to claim 7, further comprising a second anchorage device (17), wherein one end of said second anchorage device (17) is fixedly connected to said first band (6).

10. The device for periodontal ligament distraction osteogenesis mesial mobile molars according to claim 9, wherein said second anchorage device (17) comprises a third band (18) fitted over the distraction side premolars, a lingual arch (19) and a fourth band (20), said fourth band (20) fitted over the contralateral premolars, said third band (18) and said fourth band (20) being connected by said lingual arch (19), said lingual arch (19) being located above the lower anterior lingual bulge.

11. The device for periodontal ligament distraction osteogenesis mesial mobile molars according to claim 10, wherein said third band (18) is wrapped around at least one premolar on the distraction side, said fourth band (20) is wrapped around at least one opposite premolar, said third band (18) being fixedly connected to the first band (6).

12. A correction method for mesial movement of molar teeth comprises the following steps:

a. acquiring three-dimensional data of an oral dentition model;

b. means for making a periodontal ligament distraction osteogenesis mesial mobile molar according to any of claims 1 to 11;

c. performing alveolar cancellous bone resection on the middle proximal alveolar bone of the molar;

d. a device for wearing and fixing the mesial mobile molar;

e. and adjusting the rate of periodontal ligament stretching and osteogenesis, and performing mesial moving molar of periodontal ligament stretching and osteogenesis.

13. The method of correcting mesial molar movement of claim 12,

in the step b, a device for grinding the teeth to move in the mesial direction is manufactured according to the obtained alveolar bone and tooth root data and a model obtained by intraoral scanning or alginate mold extraction; in the step c, planting a first anchorage device and/or a second anchorage device according to needs; and determining the bone distraction rate according to the number of molar roots required to move medially in the step e.

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