CN115737160A - Device for assisting in stealth correction and closing tooth extraction gap - Google Patents

Abstract

The invention discloses a device for assisting in closing tooth extraction gaps in invisible correction, which comprises a retention block, a connection assembly, four limiting blocks and a traction arm, wherein the retention block is used for being bonded and retained with a tooth surface; the back of the tooth surface bonding surface is vertically connected with the first connecting rod, the second connecting rod is vertically and rotatably connected with the other end of the first connecting rod through a bearing, limiting rods are arranged at two ends of the second connecting rod respectively, one end of the third connecting rod is vertically connected with the bearing, the other end of the third connecting rod is connected with the draft arm, and the extending direction of the draft arm is parallel to the second connecting rod. The invisible orthodontic treatment device can assist in closing the tooth extraction gap in invisible orthodontic treatment, reduce possible negative effects of tooth root absorption, alveolar bone reduction and the like caused by inclined reciprocating movement of teeth, and shorten the treatment time of invisible orthodontic treatment.

Description

Device for assisting in stealth correction and closing tooth extraction gap

Technical Field

The invention relates to the technical field of oral medical invisible correction, in particular to a device for assisting in invisible correction and closing tooth extraction gaps.

Background

In orthodontic treatment, gaps are often obtained by reducing tooth extractions. In the conventional fixed correction, the flat dentition is usually aligned on a super elastic nickel-titanium wire, the tooth-drawing gap is closed on a hard stainless steel square wire, and various auxiliary devices such as a rocking chair bow, a dead axle spring, a long traction hook and the like are assisted so as to close the tooth-drawing gap under the condition of good three-dimensional control on teeth.

With the development of 3D scanning, analysis, printing technology and biological materials, the bracket-free invisible appliance is accepted by doctors and patients due to the advantages of comfort, beauty, sanitation and long time of return visit. However, the invisible orthodontic appliance is difficult to combine the wrapping property and the rigidity, the invisible braces have lower rigidity than the arch wire, and when the tooth extraction gap is closed, the tongue of the cuspid is prone to tilt and extend, and the tongue of the molar is prone to tilt and incline in the middle and near, so that a roller coaster effect is formed. Therefore, the invisible correction needs to arrange auxiliary devices at two sides of the tooth extraction gap to help close the tooth extraction gap.

In addition, although the roller coaster effect is usually avoided clinically by designing a long rectangular attachment, slowing down the tooth moving step pitch, moving teeth step by step, designing a backup resistance, designing correction, using an attachment supporting powerarm and other measures at present, artificially prolonging the correction time and using an auxiliary device, the roller coaster effect is still difficult to avoid.

Disclosure of Invention

In view of the above problems, the present invention provides a device for assisting in closing the tooth extraction gap by invisible correction.

The technical scheme of the invention is as follows:

a device for assisting in invisible correction and closing of tooth extraction gaps comprises retention blocks, a connecting assembly, four limiting blocks and a traction arm, wherein the retention blocks are used for being bonded and retained with tooth surfaces, the connecting assembly comprises a first connecting rod, a second connecting rod and a third connecting rod, and the four limiting blocks are respectively positioned at four corners of the back surface of the tooth surface bonding surface of the retention blocks; the back of the tooth surface bonding surface of the retaining block is vertically connected with the first connecting rod, the second connecting rod is in vertical rotatable connection with the other end of the first connecting rod through a bearing, two ends of the second connecting rod are respectively provided with limiting rods, when the second connecting rod rotates relative to the first connecting rod, the limiting rods at two ends of the second connecting rod are limited by two limiting blocks arranged diagonally, one end of the third connecting rod is vertically connected with the bearing, the third connecting rod is in a right angle with an included angle between the second connecting rod, the other end of the third connecting rod is connected with the traction arm, and the extension direction of the traction arm is parallel to the second connecting rod.

Preferably, the tooth surface bonding surface of the retention block is a curved surface.

Preferably, the tooth surface bonding surface of the retention block is provided with a plurality of uniformly distributed grooves or bulges.

Preferably, the back surface of the tooth surface bonding surface of the retention block is a curved surface, and the curvature of the back surface is the same as that of the tooth surface bonding surface.

Preferably, the first connecting rod is arranged at the highest salient point of the back surface.

Preferably, the plurality of the pulling arms is provided.

Preferably, the plurality of the draft arms are equally spaced on the third connecting rod.

Preferably, the tail end of the traction arm is provided with a limiting component.

Preferably, the limiting part is a round ball.

Preferably, one of the traction arms is arranged in the middle of the connecting rod III.

The invention has the beneficial effects that:

the invention has simple structure, convenient manufacture, precision, smallness and small occupied space, and does not influence the wearing and the sequential replacement of the conventional invisible appliance; by arranging the bearing, the connecting assembly and the limiting block, the action point of the traction arm can be controlled by utilizing the matching of all parts and the vertical couple, the tooth extraction gap is assisted to be closed in the invisible correction, the possible negative effects of tooth root absorption, alveolar bone reduction and the like caused by the inclined reciprocating movement of teeth are reduced, and the invisible correction treatment time is shortened; when the invention is provided with a plurality of traction arms, the traction arms with different heights can be used according to requirements, and under the condition, when a patient is in a double-visit, a doctor only needs to check the good condition of the device or replace the elastic traction accessories or guide the patient to replace the traction arms with different heights, thereby reducing the operation time beside the chair.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a device for assisting invisible orthodontic closing of an extraction gap according to the invention; wherein, fig. 1 (a) is a front view structure diagram, and fig. 1 (b) is a side view structure diagram;

FIG. 2 is a schematic structural view of a retention block of the device for assisting invisible orthodontic closing of an extraction gap according to an embodiment of the invention; wherein, fig. 2 (a) is a front view structure diagram of the tooth surface bonding surface, and fig. 2 (b) is a side view structure diagram;

FIG. 3 is a schematic view of the device for closing the tooth extraction gap for assisting invisible correction according to the present invention;

FIG. 4 is a schematic diagram of a preferred embodiment of the present invention for use with a moderate anchorage;

FIG. 5 is a schematic diagram of a specific embodiment of the present invention in use with minimal anchorage;

FIG. 6 is a schematic diagram of a structure of an embodiment of the present invention for maximum anchorage.

Reference numbers in the figures: 1-a retaining block, 2-a limiting block, 3-a traction arm, 4-a connecting rod I, 5-a connecting rod II, 6-a connecting rod III, 7-a bearing, 8-a limiting rod and 9-a limiting component.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the drawings.

It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.

It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, the terms "first", "second", and the like are used for distinguishing similar objects, but not for describing a particular order or sequence order, unless otherwise specified. It is to be understood that the terminology so used; the use of the terms "upper", "lower", "left", "right", etc. generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, "inner", "outer", and the like refer to the inner and outer relative to the contours of the components themselves for ease of understanding and description. The above directional terms are not intended to limit the present invention.

As shown in fig. 1-2, a device for assisting in invisible correction and closing of a tooth extraction gap comprises a retention block 1, a connection assembly, limit blocks 2 and a traction arm 3, wherein the retention block 1 is used for being bonded and retained with a tooth surface, the connection assembly comprises a first connection rod 4, a second connection rod 5 and a third connection rod 6, the four limit blocks 2 are arranged, and the four limit blocks 2 are respectively positioned at four corners of the back surface of the tooth surface bonding surface of the retention block 1; the back of 1 tooth face bonding face of retention piece with connecting rod 4 links to each other perpendicularly, connecting rod two 5 through bearing 7 with the perpendicular rotatable coupling of the other end of connecting rod one 4, the both ends of connecting rod two 5 are equipped with gag lever post 8 respectively, work as connecting rod two 6 for when connecting rod one 5 rotates, the gag lever post 8 at connecting rod two 5 both ends is spacing by two stoppers 2 that the diagonal angle set up, the one end of connecting rod three 6 with bearing 7 links to each other perpendicularly, just connecting rod three 6 with contained angle between connecting rod two 5 is the right angle, the other end of connecting rod three 6 with trailing arm 3 links to each other, the extending direction of trailing arm 3 with connecting rod two 5 are parallel.

In the embodiment, when the tooth extraction device is used, the tooth extraction device is respectively arranged on the left side and the right side of the tooth extraction gap needing to be closed, and the tooth surface bonding surface of the fixing block 1 is smaller than the tooth socket windowing, so that the interference of taking and putting on the tooth socket can be avoided, and the tooth socket material is kept to wrap the teeth; the fixing block 1 is fixedly bonded with the tooth surface, the traction arm 3 between the two devices is connected through an elastic wire or a rubber chain, and through the matching of the connecting assembly and the limiting block 2, the acting point of the traction arm can be controlled by utilizing a vertical couple, so that the application point of the traction force is closer to or passes through the resistance center of the tooth, the tooth is prevented from inclining to the defect in the moving process, all accessories on the invisible tooth socket are reserved simultaneously, and the tooth socket is favorable for wrapping and controlling the tooth.

In a specific embodiment, the tooth surface bonding surface and the back surface of the tooth surface bonding surface of the retention block 1 are both curved surfaces, the curvature of the back surface is the same as that of the tooth surface bonding surface, and the first connecting rod 4 is arranged at the highest salient point of the back surface. Optionally, the tooth surface bonding surface of the retention block 1 is provided with a plurality of uniformly distributed grooves or protrusions.

In the above embodiment, the tooth surface adhering surface of the retention block 1 is formed as a curved surface, so that the adhesion to the gingival part of the tooth can be performed as much as possible while the adhesion area is secured and the gum is prevented from being pressed. The radian of curved surface and tooth neck portion is close, so can increase the laminating degree of spacing piece 1 and tooth, through the tooth face bonding surface sets up recess or arch, can increase the bonding area of bonding agent and retention piece, reinforcing bonding effect.

When the retaining block 1 is bonded, a photo-curable resin adhesive is used, and the adhesive on the periphery of the tooth surface bonding surface needs to be carefully removed before curing. In height, the retention block 1 is bonded to the neck of the canine or molar, in the mesial-distal direction, the retention block is bonded to the middle 1/3 of the canine and the distal 1/3 of the molar. In this way, the central crown of the cuspid and mesial molars still retain intact, large-sized attachments, increasing control of the tooth.

In the above embodiment, the back surface of the tooth surface bonding surface of the retention block 1 is also set to be a curved surface, which is beneficial for the first connecting rod 4 to avoid the protruding alveolar ridge when extending towards the gum direction, so that the discomfort of the patient can be reduced by matching with the curvature of the alveolar bone.

In a specific embodiment, the plurality of the draft arms 3 is provided, and the plurality of the draft arms 3 are equally spaced apart on the connecting rod three 6. Optionally, a limiting part 9 is arranged at the end of the traction arm 3, the limiting part 9 is a round ball, and the outer diameter of the round ball is larger than that of the traction arm.

In the above embodiment, the plurality of the draft arms 3 are provided, so that draft arms with different heights can be selected according to the root length of the tooth, the position of the impedance center (the root length of the tooth is measured by cone beam CBCT or a curved surface fault layer sheet to determine the impedance center of the tooth) and the required moving mode, such as integral movement or inclined movement, so that the height of the draft arm is matched with the height of the impedance center of the tooth, and the draft effect is enhanced. The ball limiting part at the tail end can avoid stimulation to gum and mucous membrane, reduce the slipping space of the orthodontic elastic traction accessory and increase the retention of the orthodontic elastic traction accessory.

In a specific embodiment, the diameter of the connecting rod three 6 is 1.2mm, the length of the traction arm 3 is 2mm, and the traction arm is at right angle with the connecting rod three 6, so that the orthodontic elastic accessory can not be separated from the traction arm, the interval between each traction arm is 1mm, and a space is reserved for the retention of the elastic wire or the rubber chain. The direction of the said arm 3 is designed in two models, one towards the mesial and one towards the distal, for use on the anterior and posterior teeth respectively. The retaining block 1 is adhered to the far middle neck part of the molar, the near-far middle center or the far middle neck part of the cuspid is as close to the gum as possible, but can not press the gum, and the distance between the retaining block and the gum is at least 1mm, so that the retaining block is convenient to clean. It should be noted that the size of each part can affect the overall rigidity of the device, and the size of the connecting rod three 6 and the like needs to ensure that the device has sufficient rigidity to avoid affecting the service life of the device. When in design, the invention can be obtained by adopting sub-components with other diameters or lengths according to the length of the correcting time, the requirement of rigidity and the like.

In a particular embodiment, one of the traction arms 3 is arranged in the middle of the connecting rod three 6. In this embodiment, the draft arm 3 that is located the middle part can be used for carrying out vertical traction to upper and lower tooth, and elastic traction such as rubber band sets up on the middle part draft arm of the device of tooth from top to bottom provides vertical to traction force, increases the vertical control to the dentition, is favorable to the flattening interlock curve, opens the interlock, improves the realization efficiency that the lower anterior tooth of stealthy correction was pressed, is extended middle section tooth. When the device of the embodiment is used, a doctor can guide a patient to increase vertical traction according to clinical needs, and the patient can independently take off and wear elastic traction pieces such as rubber bands on the traction arm in the middle. In addition, vertical distraction is typically used for devices on posterior teeth, but the device of this embodiment can also be used on canine teeth.

In a specific embodiment, the retention block 1, the connection assembly and the traction arm 3 are made of stainless steel or cobalt-chromium alloy.

In a specific embodiment, the invention is used for assisting a patient in closing an extraction gap, and specifically comprises the following steps:

(1) Patients were digitally scanned orally or alginate models were taken.

(2) And measuring the root length according to the cone beam CBCT or the curved surface fault layer sheet, and determining the center of the tooth impedance.

(3) According to the malocclusion type of a patient, the initial angle of cuspid and first molar, the size of the tooth extraction gap needing to be closed and the tooth form, the height, the near-far middle position, the height of a traction arm and the curved surface form of the tooth surface bonding surface of the retention block of the device are designed on a digital oral cavity model or a plaster model.

(4) A facing windowing is designed in an invisible digital scheme, and a bonding position of the device is reserved.

(5) Integrally casting or welding each part of the device step by step to obtain the device matched with a patient; and (5) producing the invisible tooth socket.

(6) The invisible braces are worn and are bonded according to the windowing positions of the braces.

(7) Depending on clinical dental mobility needs, the patient is instructed to hang a replacement elastic traction device, such as an elastic band, between the two traction arms of the device of the present invention, or the doctor hangs a non-replacement elastic traction device, such as an elastic chain.

As shown in fig. 3 and 4, for moderate anchorage, the present invention is secured to the canine and molar teeth, respectively; the orthodontic elastic traction attachment 3 is hung on the traction arm of the invention of the molar and then pulled forward to the traction arm of the invention of the canine. When the traction arm of the back tooth is subjected to forward traction force, the traction arm is transferred to a bearing of the traction device to cause the connecting rod to rotate clockwise, the limiting rod is linked to be in contact with the limiting block, so that a clockwise rotating couple is applied to the tooth, the tooth crown is difficult to move forwards, the tooth root is not overturned, and the integral movement is realized. As shown in fig. 5, for minimum anchorage, the present invention can be secured to the molars with the orthodontic elastic traction attachments hanging on the molars and the anterior anchorage pins. As shown in fig. 6, for maximum anchorage, the present invention can be fixed to cuspids and orthodontic elastic traction attachments hung on the cuspids and the anchorage pins at the rear.

In conclusion, the invention can ensure that the canines and the molars at the two sides of the tooth extraction gap move integrally towards the tooth extraction gap at the beginning in the invisible correction, thereby reducing the possible negative effects of tooth root absorption, alveolar bone reduction and the like caused by the inclined reciprocating movement of the teeth; the maintenance of the inclination of the cuspid shaft is beneficial to controlling the anterior occlusal plane and avoiding the clockwise rotation of the occlusal plane; the cuspid is an important supporting tooth in an anterior tooth area, and the stability of the three-dimensional position of the cuspid is beneficial to the depression and the torque control of the anterior tooth; the first molar is the tooth with the thickest root in the full-mouth teeth and is also the most important supporting tooth of the posterior arch, the forward inclination prevention of the first molar is favorable for maintaining the width of the posterior arch and flattening the occlusion curve, and meanwhile the mesial movement of the first molar is one of the most difficult movements in closing the tooth extraction gap, so that the mesial overall movement of the first molar is promoted to shorten the treatment time. With the aid of the method, in the invisible design process, the moving step pitch of each step can be increased, the tooth moving efficiency is improved, the restarting times are reduced, and the treatment duration of invisible correction of tooth extraction cases is greatly shortened; finally, the design of the overcorrection amount of the tooth extraction cases can be reduced, the total steps are reduced, and the side effect of the overcorrection on the adjacent teeth can be reduced. When the patient is in a double-examination, a doctor only needs to check the good condition of the multi-length curved surface traction device or replace the elastic traction accessory or guide the patient to replace and use the traction arms with different heights, repeated adhesion is not needed, and the traction buckle does not need to be trimmed for each pair of correction devices, so that the chair-side operation time is greatly reduced.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.

Claims (10)

1. A device for assisting in stealth correction and closing of a tooth extraction gap is characterized by comprising a retention block, a connection assembly, four limiting blocks and a traction arm, wherein the retention block is used for being bonded and retained with a tooth surface; the back of the tooth surface bonding surface of the fixing block is vertically connected with the first connecting rod, the second connecting rod is vertically and rotatably connected with the other end of the first connecting rod through a bearing, limiting rods are arranged at two ends of the second connecting rod respectively, when the second connecting rod rotates relative to the first connecting rod, the limiting rods at two ends of the second connecting rod are limited by two limiting blocks arranged diagonally, one end of the third connecting rod is vertically connected with the bearing, a right angle is formed between the third connecting rod and the second connecting rod, the other end of the third connecting rod is connected with the traction arm, and the extension direction of the traction arm is parallel to the second connecting rod.

2. The device for assisting in invisible orthodontic closing of the tooth extraction gap according to claim 1, wherein the tooth surface bonding surface of the retention block is a curved surface.

3. The device for assisting in invisible orthodontic closing of the tooth extraction gap according to claim 2, wherein the tooth surface bonding surface of the retention block is provided with a plurality of uniformly distributed grooves or protrusions.

4. The device for assisting in invisible orthodontic closure of the tooth extraction gap according to claim 2, wherein the back surface of the tooth surface bonding surface of the retention block is a curved surface, and the curvature of the back surface is the same as that of the tooth surface bonding surface.

5. The device for assisting in stealth correction and closure of tooth extraction gaps according to claim 4, wherein the first connecting rod is arranged at the highest protruding point of the back surface.

6. The device for assisting in invisible orthodontic closing of the tooth extraction gap according to claim 1, wherein the traction arm is provided in plurality.

7. The device for assisting in stealth correction and closure of tooth extraction gaps according to claim 6, wherein a plurality of said traction arms are equally spaced on said third connecting bar.

8. The device for assisting in stealth correction and closure of tooth extraction gaps according to claim 6, wherein the tail end of the draft arm is provided with a limiting component.

9. The device for assisting in stealth correction and closing of tooth extraction gaps according to claim 8, wherein the limiting member is a ball.

10. The device for assisting in stealth correction and closure of tooth extraction gaps according to any one of claims 6 to 9, wherein one of the traction arms is arranged in the middle of the third connecting rod.

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