A device for distally moving posterior teeth

Abstract

The present invention relates to a device for distally moving a posterior dentition, comprising a coupling body (1), an anti-lock component (2) and a vertical control device, wherein the coupling body (1) comprises an annular body (11) and a buccal connecting rod (12), wherein the annular body (11) covers the first molar and the canine respectively and is connected via the buccal connecting rod (12), wherein the anti-lock component (2) is arranged on the buccal side and connected to the coupling body (1), and wherein the vertical control device is connected to the coupling body (1). Compared with the prior art, the device of the present invention does not require bonding and can prevent tooth eversion during the process of distally moving a group of teeth.

Description

Technical Field

[0001] The present invention relates to the technical field of tooth correction, and in particular to a device for distally moving posterior teeth. Background Art

[0002] With the development of economy and the progress of society, more and more people choose to receive orthodontic treatment for aesthetic or functional reasons. In clinical work, orthodontists use various appliances to apply force to teeth, jaws or temporomandibular joints to make teeth tilt, move as a whole, control roots, move vertically (elongate or depress) or rotate, and remodel the shape and position of jaws, so as to achieve the established correction effect and the correction goal of balance, beauty and stability. Distal movement of molars is a common clinical method to solve various malocclusions, such as skeletal and dental protrusions and odontogenic crowding, in patients who are unwilling to undergo tooth extraction or are not suitable for tooth extraction. There are many methods for clinical distal movement of molars, but they do have various defects: some require excellent cooperation from the patient; some use the anterior teeth as support, which may easily cause partial loss of support for the premolars and incisors; some have insufficient support and need to push each tooth individually, and cannot move a group of teeth, resulting in a long treatment time; some push rod devices push molars, which are bonded to the tooth surface, and can easily fall off if the time is too long or the pushing force is too large, affecting the treatment effect. In addition, the molars cannot be effectively controlled in three dimensions.

[0003] At present, the methods of distalizing molars in clinical practice are as follows: extraoral force devices such as extraoral bows and J hooks can provide strong support but are heavily dependent on the cooperation of the patient; intraoral force devices such as pendulum appliances and longitudinal screw-type removable appliances for distalizing molars do not require high patient compliance but are prone to cause loss of support for premolars and incisors and cannot provide absolutely strong support. Moreover, they can only push teeth one by one when needed and cannot move a group of teeth, resulting in a long treatment time. Moreover, after the molars are pushed successfully and the premolars and anterior teeth are distalized, the support is easily lost again, which is time-consuming and labor-intensive. For the distalization of the entire dentition with fixed correction combined with implant support technology, the entire dentition needs to be arranged and replaced with hard wires before the entire dentition can be distalized, which inevitably leads to back-and-forth movement of the anterior teeth. The treatment course is also prolonged, increasing the risk of alveolar bone atrophy and root resorption in the anterior area.

[0004] Using a push rod with micro-implant support to move the posterior teeth to obtain space for the front teeth to align or retract provides a new idea for pushing the molars distally. At present, the push rod is widely used in clinical practice. Liu Yuehua's team found that there are two shortcomings. The first shortcoming is that the bonding surface of the two ends of the push rod is relatively small, and it is mainly bonded to the tooth surface by adhesives. The force required to push the teeth distally is relatively large, about 8oz, and the strength of the bonding performance is relatively high. In addition, when the teeth move, the original occlusion changes, there will be occlusal interference points, which is also a great test for the bonding performance. Therefore, it is currently not enough to resist the force of pushing the molars distally. The second shortcoming is that the buccal implant support moves the teeth distally, because the force is applied from the buccal direction, there will be a force to move the buccal side of the dentition, resulting in tooth eversion and early occlusal contact. Especially for long faces, it will cause the face shape to become further elongated, the face shape will deteriorate and become ugly, and the three-dimensional control of the posterior teeth cannot be effectively achieved. Summary of the invention

[0005] The object of the present invention is to provide a device for distally moving the posterior dentition without bonding and capable of preventing the teeth from everting out during the process of distally moving the teeth.

[0006] The purpose of the present invention can be achieved through the following technical solutions: a device for distally moving the posterior dentition, comprising a coupling body, an anti-jamming component and a vertical control device, the coupling body comprising an annular body and a buccal connecting rod, the annular body respectively covers the first molar and the canine and is connected through the buccal connecting rod, the anti-jamming component is arranged on the buccal side and connected to the coupling body, and the vertical control device is connected to the coupling body. The present invention adopts a cast integrally formed coupling body to cover the first molar and the canine, and does not need to be bonded to the tooth surface. The coupling body is connected to the anti-jamming component from the buccal side to achieve distal movement of the entire group of teeth from the canine to the molar. The vertical control device can prevent defects such as tooth eversion caused by the anti-jamming component when the group of teeth is distally moved from the buccal side.

[0007] Furthermore, the device is arranged on the upper jaw, and the vertical control device comprises a push rod arranged on the palate side, the push rod comprises a coil spring and a V-shaped curve, and a base is arranged on the V-shaped curve. The vertical control device can cooperate with the swallowing activity of the tongue muscle to generate the force of depression and distal movement, and utilizes the physiological swallowing force very gently, which can reduce the implantation depression of the molar by the palate side implant support.

[0008] Furthermore, there are four coil springs, of which two coil springs at both ends of the push rod are located distally of the first molar, and two coil springs in the middle of the push rod are located mesially of the first molar, and the V-shaped spring is arranged between the two coil springs in the middle of the push rod. This structural design enables the push rod to generate a thrust to move the first molar in the distal direction under the action of the base when the base is depressed during the physiological swallowing process. In addition, when it is necessary to cooperate with the distal movement of the molar by more than 2mm, because the upper posterior dental arches on both sides extend backward and outward in an "eight" shape, the coil springs close to the molars can be adjusted, and the arches can be expanded to both sides to cooperate with the long-distance distal movement of the molars, so that the molars are always distally moved in the center of the alveolar ridge to prevent the molars from tilting buccal and lingually.

[0009] Preferably, the push rod is made of a steel wire with a diameter of 0.8-1.0 mm bent into an "M" shape, and the four coil springs and the V-shaped bend are respectively located at the end points and the bend of the "M" shape.

[0010] Preferably, the base is perpendicular to the midline of the face, and the cross-sectional area of ​​the base is 2 to 3 cm 2 The top of the base is 2 to 5 mm away from the upper palate.

[0011] Alternatively, the device is arranged in the mandible, and the vertical control device comprises a tongue bar. The tongue bar is connected to the lingual side of the ring body covering the first molar and the buccal side of the ring body covering the canine at the same time, and the front end is located on the labial side of the anterior tooth area and can be covered with a flexible material to prevent damage to the labial side. When the support component located on the buccal side moves the canine distally to the entire group of molar teeth, the tongue bar can prevent the teeth from everting outward toward the buccal side.

[0012] Preferably, a traction hook is provided on the buccal connecting rod, and the connecting body is connected to the support component via the traction hook.

[0013] Further preferably, the traction hook is located on the buccal side of the first molar and / or canine.

[0014] The support component includes an implant screw arranged on the buccal side. The root bifurcation of the molar is the bioimpedance center of the molar. The implant screw can be implanted at different heights. According to different facial shapes, it is necessary to move the posterior molar distally and then lower it, or only move the molar distally, or whether the molar needs to be extended.

[0015] The support component is connected to the connecting body through a rubber chain or a nickel-titanium tension spring nail.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The present invention covers the first molar and the canine at the same time through the coupling body, and the support component located on the buccal side moves the entire group of teeth from the canine to the molar distally from the buccal side through the coupling body, and cooperates with the vertical control device to form a plane body, so that when the teeth move distally, the tilting movement does not occur to the greatest extent, and the vertical depression is achieved at the same time, while most of the existing molar pushing devices move the molar distally with tilting;

[0018] 2. The present invention implants the nail on the buccal side, and the implantation position is relatively flexible. Different heights can be selected for implantation, and the height of the implant can be selected according to the patient's growth type and treatment needs;

[0019] 3. The present invention designs a traction hook on the buccal side of the canine, which can move the canine as a whole to a group of molars distally. At the same time, since the rigidity of the coupling body is sufficient to resist the torsion of the canine due to the force applied on the buccal side, a group of teeth can be moved at the same time, saving time and effort;

[0020] 4. The palatal side of the maxillary first molar of the present invention is connected with vertical control, and the V-shaped curved base is 2 to 5 mm away from the upper palate, and the swallowing activity of the tongue muscle is coordinated to generate the force of depression and distal movement, and the physiological swallowing force is very gentle, which can reduce the implantation of the palatal implant support to depress the molar;

[0021] 5. The mandibular device of the present invention uses a tongue bar to achieve vertical control, which has a simple structure and prevents the teeth from tilting during distal movement;

[0022] 6. The present invention retracts the anterior teeth after the canines are fully in place, thereby achieving efficient correction. The key is to avoid the reciprocating movement of the anterior teeth, and also prevent the molars from rebounding when the premolars and canines are pushed after the molars are pushed in place, resulting in no gap to achieve distal movement of the premolars and canines;

[0023] 7. The device of the present invention does not need to be bonded to the tooth surface, thus avoiding the problems faced when the push rod is bonded to the tooth surface in the prior art, and providing a new idea for pushing the molar distally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a coupling body and a vertical control device according to Embodiment 1 of the present invention;

[0025] Figure 2 The structure of the device for distally moving the posterior teeth in Example 1 of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 3 The structure of the device for distally moving the posterior teeth in Example 1 of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the structure of a device for distally moving posterior teeth according to Embodiment 2 of the present invention;

[0028] In the figure: 1-connecting body, 11-annular body, 12-buccal connecting rod, 13-traction hook, 2-support component, 3-push rod, 31-coil spring, 32-V-shaped bend, 4-base, 5-lingual rod. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example 1

[0031] A device for distally moving the posterior teeth, placed on the maxilla, such as Figures 1 to 3 As shown, it includes a coupling body 1, an anti-jamming component 2, a push rod 3 and a base 4. The coupling body 1 includes an annular body 11 and a buccal connecting rod 12. The annular body 11 covers the first molar and the canine. The buccal connecting rod 12 connects the annular body 11 and is provided with a traction hook 13. The anti-jamming component 2 is an implant screw located on the buccal side. The push rod 3 is located on the palatal side, and its two ends are connected to the annular body 11 covering the first molar. It is formed by bending a steel wire with a diameter of 0.8 to 1.0 mm, and includes four curved springs 31 and a V-shaped curve 32 located on the midline of the face. The two coil springs 31 close to the molars on both sides are located far from the first molar, and the two coil springs 31 close to the midline of the face are located near the first molar. The V-shaped curve 32 is provided with a base 4 perpendicular to the midline of the face.

[0032] When the device of this embodiment moves the posterior teeth distally, the implant screw and the traction hook 13 located on the buccal side of the canine are connected by a rubber chain or a nickel-titanium tension spring pin. Since the coupling body 1 is a cast one-piece structure, the rigidity is sufficient to resist the torsion of the canine due to the force applied on the buccal side, and the canine can be moved as a whole to a group of molars. At the same time, the base 4 on the V-shaped curve 32 is pressed down by the upper palate during swallowing, driving the push rod 3 to push the first molar distally.

[0033] Example 2

[0034] A device for distally moving the posterior teeth, placed on the mandible, such as Figure 4 As shown, it includes a coupling body 1, an anti-lock component 2 and a tongue rod 5. The coupling body 1 includes an annular body 11 and a buccal connecting rod 12. The annular body 11 covers the first molar and the canine. The buccal connecting rod 12 connects the annular body 11 and is provided with a traction hook 13. The anti-lock component 2 is an implant screw located on the buccal side. The two ends of the tongue rod 5 are respectively connected to the lingual side of the annular body 11 covering the first molar, the middle section of the tongue rod 5 is connected to the buccal side of the annular body 11 covering the canine, and the front section of the tongue rod 5 is located on the labial side of the anterior tooth area, and can be covered with a flexible material to prevent damage to the labial side.

[0035] When the device of this embodiment moves the posterior teeth distally, the implant screw and the traction hook 13 located on the buccal side of the canine are connected by a rubber chain or a nickel-titanium tension spring pin. Since the connecting body 1 is a cast one-piece structure, it is rigid enough to resist the torsion of the canine due to the distal movement of the canine on the buccal side, and can move the canine to a group of molars as a whole. The tongue rod 5 can prevent the teeth from everting toward the buccal side during the process of distally moving the teeth.

[0036] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A device for distally moving posterior teeth, characterized in that: The invention comprises a coupling body (1), an anti-lock component (2) and a vertical control device, wherein the coupling body (1) comprises an annular body (11) and a buccal connecting rod (12), the annular body (11) respectively covers the first molar and the canine and is connected via the buccal connecting rod (12), the anti-lock component (2) is arranged on the buccal side and is connected to the coupling body (1), and the vertical control device is connected to the coupling body (1); The buccal connecting rod (12) is provided with a traction hook (13), and the connecting body (1) is connected to the support component (2) via the traction hook (13); The traction hook (13) is located on the buccal side of the first molar and / or canine; The support component (2) comprises an implant nail arranged on the buccal side; The support component (2) is connected to the connecting body (1) via a rubber chain or a nickel-titanium tension spring nail.

2. The device for distally moving the posterior teeth according to claim 1, characterized in that: The device is arranged on the upper jaw, and the vertical control device comprises a push rod (3) arranged on the palate side, the push rod (3) comprises a coil spring (31) and a V-shaped bend (32), and a base (4) is arranged on the V-shaped bend (32).

3. The device for distally moving the posterior teeth according to claim 2, characterized in that: There are four coil springs (31), of which two coil springs (31) located at both ends of the push rod (3) are located distally of the first molar, and two coil springs (31) located in the middle of the push rod (3) are located proximally of the first molar. The V-shaped bend (32) is arranged between the two coil springs (31) located in the middle of the push rod (32).

4. The device for distally moving the posterior teeth according to claim 3, characterized in that: The push rod (3) is made of a steel wire with a diameter of 0.8-1.0 mm bent into an "M" shape, and the four coil springs (21) and the V-shaped bend (22) are respectively located at the end points and the bend of the "M" shape.

5. The device for distally moving the posterior teeth according to claim 2, characterized in that: The base (4) is perpendicular to the midline of the surface, and the cross-sectional area of ​​the base (4) is 2-3 cm 2 The top of the base (4) is 2 to 5 mm away from the upper palate.

6. The device for distally moving the posterior teeth according to claim 1, characterized in that: The device is arranged on the lower jaw, and the vertical control device comprises a tongue rod (5).

Images