Two-dimensional maxillary molar movement device

Abstract

The present invention provides a two-dimensional maxillary molar movement device, which relates to the field of orthodontic instruments. The two-dimensional maxillary molar movement device includes left and right retention components and a force application component. The left and right retention components are respectively arranged on the left and right sides of the median palatal suture, and the force application component is connected to the left and right retention components. Each retention component includes a metal crown sleeved on the first molar and a retention plate with a transverse groove in the middle. The metal crown and the retention plate are arranged on the same side of the median palatal suture and are connected by a wire. A mini-implant sleeve is connected to the buccal side of the metal crown corresponding to the maxillary zygomaticoalveolar crest. Force application component mounting holes are respectively arranged at the sagittal ends of the retention plate. In the present invention, the retention component can be closely attached to the palatal mucosa to the greatest extent, and the mini-implant can be implanted into the bone to the greatest extent, reducing the risk of failure during the force application process of the mini-implant. Moreover, during the orthodontic treatment, sufficient transverse width change of the maxilla can be achieved without removing the mini-implant.

Description

Technical Field

[0001] The present invention relates to the field of orthodontic appliances, and particularly to a clinical two-dimensional maxillary molar movement device. Technical Background

[0002] Narrow upper dental arches and protrusion of the upper dental arch are relatively common clinically. Currently, the methods for expanding narrow upper dental arches include: rapid palatal expanders, knight arches, and quad-helix springs. For rapid expansion in adults, micro-implants on both sides of the palatal suture are often required to avoid the buccal inclination of the upper posterior teeth caused by direct use of a rapid palatal expander. Currently, the bone-borne rapid palatal expanders on the market directly connect the micro-implants and the expander. For cases with obvious narrow dental arches, the problems of using this type of rapid palatal expander are as follows: (1) The palatal vault is too narrow, and the selected expander can only be as narrow as possible. However, the amount of expansion provided by a narrow expander is limited and cannot meet the clinical needs at one time. That is, when the expansion reaches a certain level, a wider expander needs to be replaced. Replacing the orthodontic appliance requires re-implanting the micro-implants, which not only increases the patient's pain but also increases the risk of subsequent failure of micro-implant implantation and raises the clinical cost. (2) There is a large distance between the expander and the top of the palatal vault. In clinical practice, special long enough micro-implants are required to provide sufficient retention. However, due to the large distance between the force application point and the implant threads of the micro-implant providing retention in the bone, and the small diameter of the micro-implant, there is a risk of the nail bending, breaking, or falling off during the force application process. Summary of the Invention

[0003] The purpose of the present invention is to provide a two-dimensional maxillary molar movement device. The retention component can be tightly attached to the palatal mucosa to the greatest extent, and the micro-implant can be implanted into the bone to the greatest extent, reducing the risk of failure during the force application process of the micro-implant. Moreover, during the orthodontic treatment process, sufficient transverse width change of the maxilla can be achieved without removing the micro-implant.

[0004] The purpose of the present invention is achieved by adopting the following technical solutions:

[0005] The two-dimensional maxillary molar movement device includes left and right retention components and a force application component. The left and right retention components are respectively arranged on the left and right sides of the palatal suture, and the force application component is connected to the left and right retention components. Each retention component includes a metal crown sleeved on the first molar and a retention plate with a transverse groove in the middle. The metal crown and the retention plate are arranged on the same side of the palatal suture and are connected by a wire. A planting nail sleeve is connected to the buccal side of the metal crown corresponding to the maxillary zygomaticoalveolar crest, and force application component mounting holes are respectively provided at the sagittal ends of the retention plate.

[0006] In the present invention, micro-implant holes are respectively provided on both sides of the groove of the retention plate of each retention component; the force-applying component is a lateral force-applying component, including an expansion screw arranged horizontally, and two connecting rods arranged sagittally and connected to the expansion screw, and retention columns adapted to the force-applying component mounting holes of the retention components are respectively arranged at both ends of the connecting rods; the expansion screw of the lateral force-applying component is clamped in the grooves of the left and right retention components and is connected to the left and right retention components through the retention columns.

[0007] In the present invention, the expansion screw includes first threaded rods on both sides, a first threaded tube in the middle, and a first nut fixed on the first threaded tube. The first threaded tube is provided with internal threads and is respectively connected to the first threaded rods on both sides through threads, and the thread directions on the first threaded rods on both sides are opposite; the two connecting rods are arranged on the lingual side of the first threaded tube of the expansion screw, and the first nut is between the two connecting rods. The first threaded rods on both sides are two independent threaded rods.

[0008] In the present invention, the force-applying component is a sagittal force-applying component, including a unilateral expansion screw and third, second, and first crossbars arranged sagittally from front to back. The first, second, and third crossbars are perpendicular to the unilateral expansion screw. The first and second crossbars are arranged occlusally to the unilateral expansion screw, and the third crossbar is arranged apically to the unilateral expansion screw. Retention columns adapted to the force-applying component mounting holes on the retention components are respectively arranged at both ends of the first and second crossbars, and a micro-implant sleeve is arranged on the third crossbar.

[0009] In the present invention, the unilateral expansion screw includes a second threaded tube. One end of the second threaded tube is connected to a second threaded rod through a thread, and the other end is fixedly connected to a rod. A second nut is fixed on the second threaded tube. The second threaded tube is provided with internal threads and is adapted to the external threads of the second threaded rod.

[0010] In the present invention, the first, second, and third crossbars of the sagittal force-applying component are sequentially arranged on the second threaded rod, the second threaded tube, and the rod.

[0011] In the present invention, the retention plates of the respective retention components are in close contact with the upper jaw.

[0012] Advantages of the present invention:

[0013] (1)The two-dimensional maxillary molar movement device of the present invention uses micro-implants at the maxillary zygomaticoalveolar crest, micro-implants on both sides of the median palatal suture, and the maxillary bilateral first molars as anchorage. The distance between the left and right molars is increased by a lateral expansion arch through a force-applying component; a sagittal expansion arch is performed through a sagittal force-applying component to achieve distal movement of the molars. The two-dimensional maxillary molar movement device of the present invention can be used for cases of unilateral or bilateral dental arch stenosis in the lateral direction, and can also be used for pushing the molars backward unilaterally or bilaterally in the sagittal direction.

[0014] When performing lateral expansion arch and the maxillary molars move passively laterally, since the two-dimensional maxillary molar movement device of the present invention separates the retention component from the force-applying component, the retention component is divided into two independent left and right parts, and its position design is relatively free, not affected by the width of the palatal vault. The retention component can be closely attached to the palatal mucosa to the greatest extent, and the micro-implant can be implanted into the bone to the greatest extent, reducing the risk of micro-implant failure; when the expansion arch still cannot meet the clinical needs after reaching a certain degree, only the model of the force-applying component needs to be replaced, avoiding repeated surgery for the patient. Without removing the micro-implants, sufficient width change of the maxilla can be achieved, and at the same time, the clinical efficiency is improved. The anchorage of the two-dimensional maxillary molar movement device of the present invention, in addition to the micro-implants on both sides of the median palatal suture, also includes the micro-implants of the maxillary first molars and the zygomaticoalveolar crest, which is beneficial to the overall expansion of the maxilla and reduces the buccal inclination of the posterior teeth.

[0015] (3)When longitudinal expansion arch is required and the maxillary molars move sagittally, the anchorage of the two-dimensional maxillary molar movement device of the present invention is the micro-implants implanted on the line connecting the first premolars. At this time, the micro-implants on both sides of the median palatal suture and the micro-implants of the zygomaticoalveolar crest need to be removed, and a sagittal force-applying device is used for distal movement of the molars. Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the left and right retention components, where 11 - micro-implant sleeve, 12 - metal crown, 13 - wire, 14 - retention plate, 15 - force-applying component mounting hole, 16 - micro-implant implantation hole, 17 - groove, 18 - right retention component, 19 - left retention component.

[0017] Figure 2 Structural schematic diagram of the lateral force-applying component, where (1) is the front view and (2) is the left view, 21 - first threaded rod, 22 - first nut, 23 - connecting rod, 24 - retention column, 25 - first threaded tube.

[0018] Figure 3 Structural schematic diagram of the sagittal force-applying component, where (1) is the front view and (2) is the left view, 31 - retention column, 32 - second threaded rod, 33 - second nut, 34 - rod, 35 - second threaded tube, 36 - micro-implant sleeve, 37 - vertical rod, 38 - first cross bar, 39 - second cross bar, 40 - third cross bar.

[0019] Figure 4 Schematic diagram of the structure of the auxiliary positioning device, where 51 is the bottom plate and 52 is the retention post.

[0020] Figure 5 Schematic diagram of the structure in which the retention plate, micro-implant and transfer abutment are fixed together by fixing screws, where 61 is the fixing screw, 62 is the transfer abutment, 63 is the micro-implant, and 14 is the retention plate.

[0021] Figure 6 Schematic diagram of the structure in which the lateral force-applying component is installed on the left and right retention components, 2 is the lateral force-applying component, 11 is the micro-implant sleeve, 12 is the metal crown, 13 is the steel wire, 14 is the retention plate, 18 is the right retention component, and 19 is the left retention component.

[0022] Figure 7 Schematic diagram of the structure in which the sagittal force-applying component is installed on the left and right retention components, 3 is the sagittal force-applying component, 2 is the lateral force-applying component, 11 is the micro-implant sleeve, 12 is the metal crown, 13 is the steel wire, 14 is the retention plate, 18 is the right retention component, and 19 is the left retention component. Specific implementation manner

[0023] Example 1

[0024] Combined with Figures 1-3 Describe the structure of the present invention.

[0025] The two-dimensional maxillary molar movement device includes left and right retention components 19 and 18 and force-applying components. The left and right retention components are respectively arranged on both sides of the median palatal suture, and the force-applying components are connected to the left and right retention components; each retention component includes a metal crown 12 sleeved on the first molar and a retention plate 14 with a transverse groove 17 in the middle. The metal crown 12 and the retention plate 14 are arranged on the same side of the median palatal suture and are connected by a steel wire 13. A micro-implant sleeve 11 is connected to the buccal side of the metal crown 12 corresponding to the maxillary zygomaticoalveolar crest, and force-applying component mounting holes 15 are respectively arranged at the sagittal ends of the retention plate 14. The diameter of the force-applying component mounting hole 15 is 1.51 mm and the depth is 2 mm.

[0026] The retention plate 14 of each retention component fits with the upper jaw to ensure that the micro-implant can be implanted into the bone to the greatest extent, reducing the risk of micro-implant failure.

[0027] When transverse arch expansion is required and the maxillary molars need to move transversely, a transverse force-applying component 2 is designed. At this time, on both sides of the groove 17 of the retaining plate 14 of each retaining component, micro-implant holes 16 with a diameter of 2.01 mm and a depth of 2 mm are provided. The transverse force-applying component includes a transversely arranged arch expansion screw, and two connecting rods 23 arranged sagittally and connected to the arch expansion screw. At both ends of the connecting rod 23, retaining columns 24 adapted to the force-applying component mounting holes 15 on the retaining components are respectively provided; the arch expansion screw of the transverse force-applying component is clamped in the grooves 17 of the left and right retaining components and is connected to the left and right retaining components through the retaining columns. The arch expansion screw includes first threaded rods on both sides, a first threaded tube 25 in the middle, and a first nut 22 fixed on the first threaded tube. The first threaded tube is provided with internal threads, and its two ends are respectively connected to the first threaded rods on both sides by threads. The thread directions on the first threaded rods on both sides are opposite; the two connecting rods are arranged on the lingual side of the first threaded tube of the arch expansion screw, and the first nut is between the two connecting rods. The first threaded rods on both sides are two threaded rods. The two-dimensional maxillary molar movement device of the present invention uses micro-implants at the maxillary zygomaticoalveolar crest, micro-implants on both sides of the palatal suture, and the maxillary bilateral first molars as anchorage, and performs transverse arch expansion through the force-applying component to increase the distance between the maxillary molars on both sides, so as to solve the skeletal crossbite in the posterior tooth area. The two-dimensional maxillary molar movement device of the present invention separates the retaining component from the force-applying component. The retaining component is two independent left and right parts, and its position design is relatively free and not affected by the width of the palatal vault. The anchorage of the two-dimensional maxillary molar movement device of the present invention, in addition to the micro-implants on both sides of the palatal suture, also includes the micro-implants of the maxillary first molar and the zygomaticoalveolar crest, which is beneficial to the overall expansion of the maxilla and reduces the buccal inclination of the posterior teeth. By adjusting the nut on the arch expansion screw, transverse arch expansion is achieved.

[0028] In order to make the anchorage more stable during the orthodontic treatment, the micro-implants implanted in the micro-implant holes 16 of the left and right retaining components need to be implanted at an angle. The heads of the bilateral micro-implants are all oriented towards the palatal suture and are symmetrically arranged with respect to the palatal suture, that is, the bilateral micro-implants are in an inverted V shape. However, the micro-implants implanted in this way cannot be perpendicular to the occlusal plane. By installing a transfer abutment 62 (Taiwan Asia-Pacific Medical Device Technology Co., Ltd.) with the upper end perpendicular to the occlusal plane at the head of the micro-implant, the direction of the head of the micro-implant is assisted to be adjusted, which is convenient for its smooth connection with the retaining component.

[0029] When sagittal expansion is required and the maxillary molars need to move distally sagittally, a sagittal force - applying component 3 is designed. The sagittal force - applying component includes a unilateral expansion screw and the third, second, and first crossbars 40, 39, 38 arranged successively from front to back sagittally. The first, second, and third crossbars are perpendicular to the unilateral expansion screw. The first and second crossbars are arranged occlusally to the unilateral expansion screw, and the third crossbar is arranged apically to the unilateral expansion screw. At both ends of the first and second crossbars, retention posts 31 adapted to the force - applying component mounting holes 15 on the retention component are respectively provided. A micro - implant screw sleeve 36 is arranged on the third crossbar. The unilateral expansion screw includes a second threaded tube 35. One end of the second threaded tube is connected to a second threaded rod 32 by threads and the other end is fixedly connected to a rod 34. A second nut 33 is fixed on the second threaded tube. The second threaded tube has internal threads and is adapted to the external threads of the second threaded rod. By adjusting the second nut on the unilateral adjustment expansion screw, sagittal expansion and the overall distal movement of the molars are achieved. The third crossbar is connected to the micro - implant screw sleeve 36 through a vertical rod 37.

[0030] The first, second, and third crossbars of the sagittal force - applying component are successively arranged on the second threaded rod, the second threaded tube, and the rod.

[0031] In order to avoid secondary implantation of micro - implant screws during the orthodontic treatment, different - sized transverse force - applying components or sagittal force - applying components can be replaced to achieve a satisfactory orthodontic effect with only one implantation of a micro - implant screw. The different sizes of the force - applying components are mainly the different lengths of the threaded rods, which are 6mm, 10mm, 16mm. The longer the length of the threaded rod, the more the width between the maxillary molars can be increased, or the more the molars can be pushed distally.

[0032] Example 2 Application of the present invention

[0033] The double - dimensional maxillary molar movement device in Example 1 is used to correct maxillary posterior crossbite with severely insufficient maxillary width and little crowding. The following is the specific installation method of the present invention:

[0034] (1) Implant one micro - implant screw on each of the bilateral maxillary zygomatico - alveolar ridges (the anatomical position is generally on the buccal side of the maxillary first molar).

[0035] (2) Take a maxillary model, pour super - hard plaster, and fabricate cast crowns for the left and right first molars of the maxilla respectively, with a micro - implant screw sleeve extended on the buccal side. Put the cast crowns on the first molars and the micro - implant screw sleeves on the implant screws at the zygomatico - alveolar ridges.

[0036] (3) Stably connect the retention plate with the auxiliary positioning device and place it on both sides of the palatal mid - suture of the plaster model. The distance between the two retention plates is 3mm and they are parallel to the occlusal plane. The force - applying component mounting holes 15 are parallel to each other and can be used to connect with the force - applying component. Among them, the auxiliary positioning device ( Figure 4), including a rectangular base plate 51, with a retention post 52 perpendicular to the base plate provided at each of the four corners on one side of the base plate. The retention posts are parallel to each other and are adapted to the mounting holes of the force-applying components. Through the four retention posts, the auxiliary positioning device can be mounted on the left and right retention components to ensure that the retention plates of the left and right retention components are 3 mm apart, and the four mounting holes of the force-applying components are parallel to each other.

[0037] (4) Weld the retention plate and the cast crown with a 2.0 stainless steel wire.

[0038] (5) The auxiliary positioning device is seated in the retention components, connecting the left and right retention components into a stable whole, and then seated in the mouth. Remove the auxiliary positioning device, probe through the micro-implant holes in the retention plate to reach the mucosal surface, and determine the approximate implantation position of the implant. Corresponding to the micro-implant holes in the left and right retention components, implant a micro-implant with a diameter of 2 mm and a length of 10 - 12 mm respectively. The implantation direction forms an angle of 15 - 30 degrees with the median sagittal plane, with the head facing the median palatal suture. Two micro-implants are implanted on each side of the median palatal suture, and they are symmetrically arranged with respect to the median palatal suture, that is, the bilateral micro-implants are in an inverted V shape. Take an impression and pour a high-strength dental stone model, and grind the angular direction of the transfer abutment mounted on the implant so that it can be seated on both the micro-implant and the retention plate simultaneously.

[0039] (6) Fit the transfer abutment 62 over the head of the micro-implant, bond and fix the cast crown with glass ionomer. Fix the fluid resin between the micro-implants at the zygomaticoalveolar crest and the micro-implant sleeves. The retention plate is seated on the transfer abutment. The fixing screw 61 passes through the micro-implant hole in the retention plate and then is screwed into the threaded hole of the transfer abutment, stably connecting the retention plate, the transfer abutment and the implant 63 together. See the specific structure diagram of the transverse force-applying component mounted on the left and right retention components as Figure 5 . Figure 6 .

[0040] (7) After one week, install the transverse force-applying component, and use a wrench to rotate the first nut of the expansion screw to apply force for arch expansion. Rotate the nut 1 / 2 turn every day to achieve transverse arch expansion and increase the distance between the maxillary molars.

[0041] For cases of unilateral dental arch constriction, implant micro-implants only on the healthy side to provide stable anchorage. For cases with an initially narrow palatal vault, when the first set of transverse force-applying components reaches the limit of force application and still cannot meet the clinical arch expansion requirements, a transverse force-applying component with a longer threaded rod can be replaced.

[0042] For cases that still require retracting the molars posteriorly in the future, symmetrically implant two micro-implants on the line connecting the left and right first premolars. Remove the micro-implants at the zygomaticoalveolar crest and the micro-implants on both sides of the median palatal suture, and then seat the retention posts of the sagittal force-applying component in the mounting holes of the force-applying components on the left and right retention components (as shown in Figure 7), The fluid resin-fixed micro-implant and the implant sleeve, with the unilateral expansion screw in the gap between the left and right retention components, to achieve molar distalization. For cases that require unilateral molar distalization, the retention post on the healthy side can be removed.

Claims

1. The two-dimensional maxillary molar movement device is characterized in that: It includes left and right retention components and force-applying components. The left and right retention components are respectively arranged on both sides of the median palatal suture, and the force-applying components are connected to the left and right retention components; each retention component includes a metal crown sleeved on the first molar and a retention plate with a transverse groove in the middle. The metal crown and the retention plate are arranged on the same side of the median palatal suture and are connected by a steel wire. A planting nail sleeve is connected to the buccal side of the metal crown corresponding to the maxillary zygomaticoalveolar crest. Force-applying component mounting holes are respectively arranged at the sagittal ends of the retention plate; the force-applying component includes a transverse force-applying component or a sagittal force-applying component; the retention plate of each retention component fits with the upper jaw.

2. The two-dimensional maxillary molar movement device according to claim 1, wherein Micro-implant nail implantation holes are respectively arranged on both sides of the groove of the retention plate of each retention component; the force-applying component is a transverse force-applying component, including an expansion screw arranged horizontally, and two connecting rods arranged sagittally and connected to the expansion screw. Retention columns adapted to the force-applying component mounting holes of the retention component are respectively arranged at both ends of the connecting rod; the expansion screw of the transverse force-applying component is clamped in the groove of the left and right retention components and is connected to the left and right retention components through the retention columns.

3. The two-dimensional maxillary molar movement device according to claim 2, wherein The expansion screw includes first threaded rods on both sides, a first threaded tube in the middle, and a first nut fixed on the first threaded tube. The first threaded tube is provided with internal threads and is respectively connected to the first threaded rods on both sides through threads. The thread directions on the first threaded rods on both sides are opposite; the two connecting rods are arranged on the lingual side of the first threaded tube of the expansion screw, and the first nut is between the two connecting rods.

4. The two-dimensional maxillary molar movement device according to claim 1, wherein The force-applying component is a sagittal force-applying component. The sagittal force-applying component includes a unilateral expansion screw and third, second, and first crossbars arranged sagittally from front to back in sequence. The first, second, and third crossbars are perpendicular to the unilateral expansion screw. The first and second crossbars are arranged on the occlusal side of the unilateral expansion screw, and the third crossbar is arranged on the root side of the unilateral expansion screw. Retention columns adapted to the force-applying component mounting holes on the retention component are respectively arranged at both ends of the first and second crossbars, and a micro-implant nail sleeve is arranged on the third crossbar.

5. The two-dimensional maxillary molar movement device according to claim 4, wherein The unilateral expansion screw includes a second threaded tube. One end of the second threaded tube is connected to a second threaded rod through a thread, and the other end is fixedly connected to a rod. A second nut is fixed on the second threaded tube. The second threaded tube is provided with internal threads and is adapted to the external threads of the second threaded rod.

6. The two-dimensional maxillary molar movement device according to claim 5, characterized in that The first, second, and third crossbars of the sagittal force-applying component are sequentially arranged on the second threaded rod, the second threaded tube, and the rod.

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