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

A device for assisting invisible orthodontics to close tooth extraction gaps

technical field

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

Background technique

In orthodontic treatment, space is often obtained by subtractive extraction. In traditional fixed orthodontics, the dentition is often aligned on the superelastic nickel-titanium wire, the tooth extraction gap is closed on the hard stainless steel square wire, and various auxiliary devices such as the rocking chair bow, positive shaft spring, and long traction hook are assisted, so as to Closure of the extraction gap with good three-dimensional control of the tooth.

With the development of 3D scanning, analysis, printing technology and biomaterials, clear aligners without brackets are recognized by doctors and patients for their advantages of comfort, aesthetics, hygiene and long follow-up time. However, invisible aligners are difficult to balance wrapping and rigidity. Compared with archwires, invisible braces are less rigid. When closing the tooth extraction gap, lingual inclination and elongation of canines, lingual inclination and mesial inclination of molars are prone to occur, forming a "roller coaster" effect". Therefore, invisible orthodontics needs to install auxiliary devices on both sides of the tooth extraction gap to help close the tooth extraction gap.

In addition, although the current clinical practice often avoids the "roller coaster effect" by designing long rectangular attachments, slowing down the tooth movement step, moving teeth step by step, designing anti-resistance, designing over-orthodontics, and using accessory-supported powerarms, artificially prolonging the treatment time. And the use of auxiliary devices, but the "roller coaster effect" is still difficult to avoid.

Contents of the invention

In view of the above problems, the present invention aims to provide a device for assisting invisible orthodontics to close tooth extraction gaps.

Technical scheme of the present invention is as follows:

A device for assisting invisible orthodontics to close a tooth extraction gap, comprising a retaining block, a connecting assembly, a limiting block and a traction arm, the retaining block is used for bonding and retaining with the tooth surface, and the connecting assembly includes a connecting rod 1, Connecting rod two and connecting rod three, the limit block is provided with four, and the four limit blocks are respectively located at the four corners of the back side of the bonding surface of the tooth surface of the retaining block; the tooth surface of the retaining block The back side of the bonding surface is vertically connected with the first connecting rod, and the second connecting rod is vertically and rotatably connected with the other end of the first connecting rod through a bearing. When the connecting rod 2 is rotated relative to the connecting rod 1, the limit rods at both ends of the connecting rod 2 are limited by two limit blocks arranged diagonally, and one end of the connecting rod 3 is connected to the bearing vertically connected, and the angle between the connecting rod three and the connecting rod two is a right angle, the other end of the connecting rod three is connected with the traction arm, and the extension direction of the traction arm is the same as that of the connecting rod Two parallel.

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

Preferably, the tooth surface bonding surface of the retaining block is provided with a plurality of evenly distributed grooves or protrusions.

Preferably, the back surface of the tooth surface bonding surface of the retaining 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 convex point of the back surface.

Preferably, there are multiple traction arms.

Preferably, a plurality of the traction arms are equally spaced on the connecting rod three.

Preferably, a limiting component is provided at the end of the towing arm.

Preferably, the limiting component is a ball.

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

The beneficial effects of the present invention are:

The present invention is simple in structure, easy to manufacture, precise and compact, takes up little space, and does not affect the wearing and sequential replacement of conventional invisible aligners; through the arrangement of bearings, connecting components and limit blocks, the cooperation of various components can be used to control traction by using vertical couples The function point of the arm, in invisible orthodontics, assists in closing the tooth extraction gap, reduces possible negative effects such as tooth root absorption and alveolar bone reduction caused by the inclined reciprocating movement of teeth, and shortens the duration of invisible orthodontic treatment; when the present invention sets multiple traction arms In this case, the doctor only needs to check the good condition of the device or replace the elastic traction accessories or instruct the patient to replace the traction arm with different heights when the patient returns to the clinic, reducing the time for chairside operation .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of an embodiment of the device for assisting invisible orthodontics to close the tooth extraction gap according to the present invention; wherein, Fig. 1(a) is a schematic structural diagram of a front view, and Fig. 1(b) is a schematic structural diagram of a side view;

Fig. 2 is a schematic structural view of an embodiment of the device retaining block for closing the tooth extraction gap for auxiliary invisible orthodontics of the present invention; wherein, Fig. 2 (a) is a front view structural schematic diagram of the tooth surface bonding surface, and Fig. 2 (b) is a side view structure schematic diagram;

Fig. 3 is a schematic diagram of the principle of the device for assisting invisible orthodontics to close the tooth extraction gap according to the present invention;

Fig. 4 is a structural schematic diagram of a specific embodiment when using the present invention for moderate anchorage;

Fig. 5 is a structural representation of a specific embodiment when using the present invention for minimum anchorage;

Fig. 6 is a structural schematic diagram of a specific embodiment when using the present invention for maximum anchorage.

Labels in the figure: 1-retaining block, 2-limiting block, 3-drawing arm, 4-connecting rod one, 5-connecting rod two, 6-connecting rod three, 7-bearing, 8-limiting rod, 9 - Limiting parts.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

It should be noted that, in the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other.

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

In the present invention, the terms "first", "second" and the like are used to distinguish similar objects, rather than to describe a specific order or sequence, unless stated otherwise. The terms used should be understood as such; use of the terms "upper", "lower", "left", "right", etc. generally refers to the orientation shown in the drawings, or to the parts themselves in vertical, perpendicular or In terms of the direction of gravity; similarly, for the convenience of understanding and description, "inner", "outer", etc. refer to the inner and outer relative to the outline of each component itself. But the above location words are not used to limit the present invention.

As shown in Figure 1-2, a device for assisting invisible orthodontics to close the tooth extraction gap includes a retaining block 1, a connecting assembly, a limiting block 2 and a traction arm 3, and the retaining block 1 is used for bonding to the tooth surface Retention, the connecting assembly includes connecting rod one 4, connecting rod two 5 and connecting rod three 6, four limiting blocks 2 are set, and the four limiting blocks 2 are respectively located on the retaining block 1 At the four corners of the back side of the tooth surface bonding surface; the back side of the tooth surface bonding surface of the retaining block 1 is vertically connected with the connecting rod one 4, and the connecting rod two 5 is connected to the connecting rod one 4 through the bearing 7 The other end of the connecting rod is vertically rotatably connected, and the two ends of the connecting rod two 5 are respectively provided with limit rods 8. When the connecting rod two 6 rotates relative to the connecting rod one 5, the two connecting rods two 5 The limit rod 8 at the end is limited by two limit blocks 2 arranged diagonally, one end of the connecting rod three 6 is vertically connected with the bearing 7, and the connection between the connecting rod three 6 and the connecting rod two 5 The angle between them is a right angle, the other end of the connecting rod three 6 is connected with the traction arm 3, and the extension direction of the traction arm 3 is parallel to the connecting rod two 5.

In this embodiment, when the present invention is used, the present invention is installed on the left and right sides of the tooth extraction gap that needs to be closed. The tooth surface bonding surface of the retaining block 1 is smaller than the window of the brace, so that the trouble of removing and wearing the brace can be avoided. interference, and retain the wrapping of the braces material on the teeth; the retaining block 1 is bonded and fixed to the tooth surface, and the traction arm 3 between the two devices is connected by an elastic thread or a rubber chain, and the connecting component is connected to the limiting The cooperation of block 2 can use the vertical force couple to control the action point of the traction arm, so that the force point of the traction force is closer to or passes through the resistance center of the tooth, so as to avoid tilting to the defect during the movement of the tooth, and at the same time retain all the accessories on the invisible braces , which is beneficial to the wrapping and control of the braces on the teeth.

In a specific embodiment, the tooth surface bonding surface of the retaining block 1 and the back surface of the tooth surface bonding surface are both curved surfaces, and the curvature of the back surface and the tooth surface bonding surface is the same, so The connecting rod one 4 is arranged at the highest convex point on the back side. Optionally, the tooth surface bonding surface of the retaining block 1 is provided with a plurality of evenly distributed grooves or protrusions.

In the above embodiments, the tooth surface bonding surface of the retaining block 1 is set as a curved surface, which can bond to the gum side of the tooth as much as possible on the basis of ensuring the bonding area and avoiding compression of the gums. The curved surface is close to the curvature of the tooth neck, which can increase the fit between the retaining block 1 and the teeth. By setting grooves or protrusions on the bonding surface of the tooth surface, the bonding agent and the retaining block can be increased. Bonding area, enhance the bonding effect.

When bonding the retaining block 1, a photocurable resin adhesive is used, and the adhesive on the periphery of the bonding surface of the tooth surface needs to be carefully removed before curing. In terms of height, the retention block 1 is bonded to the neck of the canine or the molar, and in the mesio-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 crowns of the canines and the mesials of the molars remain intact with large size attachments, increasing the control of the teeth.

In the above-mentioned embodiment, the back surface of the tooth surface bonding surface of the retention block 1 is also set as a curved surface, which can help the connecting rod-4 to avoid the protruding alveolar ridge when extending toward the gums, so that it can cooperate with the teeth. The curvature of the grooved bone reduces discomfort for the patient.

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

In the above-mentioned embodiment, a plurality of traction arms 3 are provided, so that the root length of the tooth, the position of the impedance center (the length of the tooth root is measured by cone beam CBCT or curved surface tomography, and the tooth impedance center is determined) and the required The way of movement, such as overall movement or inclined movement, chooses different heights of the traction arm, so that the height of the traction arm coincides with the height of the tooth impedance center to enhance the traction effect. The ball stopper at the end can not only avoid irritation to the gums and mucous membranes, but also reduce the slippage space of the orthodontic elastic traction attachment, and increase the retention of the orthodontic elastic traction attachment.

In a specific embodiment, the diameter of the connecting rod 3 6 is 1.2 mm, the length of the traction arm 3 is 2 mm, and is at right angles to the connecting rod 3 6, so as to ensure that the orthodontic elastic attachment will not break away from the traction arm, The distance between each pulling arm is 1mm, leaving space for the retention of elastic threads or rubber chains. The direction of the traction arm 3 is designed in two types, one towards the mesial and one towards the far, to be used on the anterior teeth and the posterior teeth respectively. The retaining block 1 is bonded to the distal neck of the molars, the mesial-distal center or the distal neck of the canines, as close to the gum as possible, but it cannot press the gum, and there is at least 1mm distance between it and the gum for easy cleaning . It should be noted that the size of each component will affect the overall stiffness of the device. When designing the size of the connecting rods 36, etc., it is necessary to ensure that the device of the present invention has sufficient rigidity to avoid affecting the service life of the device. During design, subcomponents of other diameters or lengths can be used to obtain the present invention according to the length of the treatment time, the demand for rigidity, and the like.

In a specific embodiment, one of the traction arms 3 is arranged in the middle of the connecting rod 3 6 . In this embodiment, the traction arm 3 located in the middle can be used for vertical traction to the upper and lower teeth, by providing elastic traction such as rubber rings on the central traction arm of the device for the upper and lower teeth, providing vertical traction force and increasing the dentition The vertical control is beneficial to level the occlusal curve, open the occlusion, and improve the efficiency of invisible orthodontics to depress the front teeth and elongate the middle teeth. When using the device of this embodiment, the doctor can instruct the patient whether to increase vertical traction according to clinical needs, and the patient can take off and wear elastic traction members such as rubber rings on the central traction arm by themselves. In addition, vertical traction is generally used for devices on posterior teeth, but the device of this embodiment can also be used on canines.

In a specific embodiment, the retaining block 1, the connecting assembly and the pulling arm 3 are respectively made of stainless steel or cobalt-chrome alloy.

In a specific embodiment, using the present invention to help patients close the tooth extraction gap specifically includes the following steps:

(1) Perform a digital oral scan or take an alginate model of the patient.

(2) Measure the tooth root length according to cone beam CBCT or curved surface tomography, and determine the tooth impedance center.

(3) According to the patient's malocclusion type, the initial angle of canines and first molars, the size of the tooth extraction gap to be closed, and the shape of the teeth, design the height, near-distal position of the device of the present invention on the digital oral model or plaster model . The height of the traction arm of the device of the present invention and the curved surface shape of the tooth surface bonding surface of the retaining block.

(4) Design the window of the braces in the invisible digitization scheme, and reserve the bonding position of the device of the present invention.

(5) Integral casting or step-by-step welding of each part of the device of the present invention to obtain the device of the present invention matched with the patient; production of invisible braces.

(6) Wear invisible braces, and bond the device of the present invention according to the window opening position of the braces.

(7) According to clinical tooth movement needs, instruct the patient to hang a replacement elastic traction device such as a rubber ring between two traction arms of the device of the present invention, or a doctor to hang a non-substitutable elastic traction device such as a rubber chain.

As shown in Fig. 3 and Fig. 4, for moderate anchorage, fix the present invention on the canines and molars respectively; hang the orthodontic elastic traction attachment 3 on the traction arm of the present invention of the molars, and then pull it forward to the cusps On the traction arm of the present invention of tooth. When the traction arm of the posterior tooth receives the forward traction force, it is transmitted to the bearing of the traction device, causing the connecting rod to rotate clockwise, and the limit rod is linked to contact with the limit block, thereby exerting a clockwise rotating force on the tooth. It makes it difficult for the tooth to have the crown forward and the root to fall without moving, so as to realize the overall movement. As shown in Figure 5, for the minimum anchorage, the present invention can be fixed on the molars, and the orthodontic elastic traction attachment is hung on the molars and the anchorage nails in front. As shown in Figure 6, for the maximum anchorage, the present invention can be fixed on the canine, and the orthodontic elastic traction attachment is hung on the canine and the rear anchorage nail.

To sum up, the present invention can make the canines and molars on both sides of the tooth extraction space move towards the tooth extraction space as a whole in the invisible orthodontic treatment, reducing possible negative effects such as root absorption and alveolar bone reduction caused by the tilting and reciprocating movement of the teeth. Influence; the maintenance of the inclination of the canine axis can help to control the anterior occlusal plane and avoid the clockwise rotation of the occlusal plane; the canine is an important supporting tooth in the anterior region, and the stability of the three-dimensional position of the canine is conducive to the depression and rotation of the anterior teeth Moment control; the first molar is the tooth with the thickest root in the whole mouth, and it is also the most important supporting tooth for the posterior arch. Avoiding the forward tilt of the first molar is conducive to maintaining the width of the posterior arch and leveling the occlusal curve. At the same time, the mesial movement of the first molar is one of the most difficult movements in closing the extraction space, and promoting the overall mesial movement of the first molar can shorten the treatment time. With the assistance of the present invention, in the process of stealth design, we can increase the moving distance of each step, improve the efficiency of tooth movement, reduce the number of restarts, and greatly shorten the treatment time of tooth extraction cases; finally, it can also reduce the over-correction of tooth extraction cases The volume design reduces the total number of steps and reduces the side effects of over-orthodontics on adjacent teeth. When the patient returns to the clinic, the doctor only needs to check the good condition of the multi-length curved surface traction device or replace the elastic traction attachment or guide the patient to replace the traction arm with different heights. There is no need for repeated bonding or trimming the traction buckle for each appliance. Significantly reduces chair time.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solution 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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