CN218484679U

CN218484679U - Orthodontic appliance with depressed ridges

Info

Publication number: CN218484679U
Application number: CN202121418031.0U
Authority: CN
Inventors: 许贤博; 郑轶刊
Original assignee: Wuxi Ea Medical Instruments Technologies Ltd
Current assignee: Wuxi Ea Medical Instruments Technologies Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2023-02-17
Anticipated expiration: 2031-06-24

Abstract

The utility model discloses a just abnormal ware of rescuing of dentistry with step-down ridge, including forming the ware body of rescuing that holds the cavity of tooth to and the step-down ridge of ware body is rescued in a body coupling, step-down ridge is including the protruding first arch of stretching of orientation cavity, and the end setting of cutting of tooth is treated to first protruding correspondence. The utility model discloses a first arch corresponds treats the end setting of cutting of correcting the tooth, and first arch is concentrated to the end of cutting and is produced the power of holding down that is on a parallel with the direction of holding down, can assist the operation of holding down of just abnormal correction ware of dentistry, and the power of holding down that first arch produced can accurate control, avoids producing the effort of other directions, and then improves first bellied effect of holding down.

Description

Orthodontic appliance with depressed ridges

Technical Field

The utility model relates to a tooth correction technical field especially relates to a dental orthodontic appliance with depressed ridge.

Background

Deep capsulization is one of the most common malpresentation in orthodontics clinic, and causes the deep capsulization mostly because of excessive development of anterior teeth or anterior alveolus and sometimes because of insufficient development of posterior teeth or posterior alveolus.

The method is used for treating patients with excessive development of anterior teeth or anterior alveolus by means of a method for depressing the anterior teeth through a dental orthodontic appliance, and meanwhile, a large number of cases of adduction of the anterior teeth also show that the anterior teeth are easy to extend in the adduction process and need to be depressed in the adduction process, and the anterior teeth depression is a very common correction requirement in clinical correction.

The current orthodontic appliance has poor depressing effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a just abnormal ware of correcting of dentistry with step down ridge, it can assist and improve the effect of stepping down.

In order to realize one of the above objects of the present invention, an embodiment of the present invention provides an orthodontic appliance with depressed ridges, including an appliance body forming a cavity for accommodating teeth, and an integral connection the depressed ridges of the appliance body, the depressed ridges include orientation a first protrusion protruding from the cavity, the first protrusion corresponds to a tip setting of teeth to be corrected.

As a further improvement of an embodiment of the present invention, the tooth to be corrected is at least one of an incisor, a cuspid, and a premolar.

As a further improvement of an embodiment of the present invention, the first protrusion covers the incisal end of the tooth to be corrected along a first direction, and the first direction is a direction from the labial surface to the lingual surface.

As a further improvement of an embodiment of the present invention, the depressed ridge further comprises a second protrusion corresponding to the lingual or labial surface of the tooth to be corrected.

As a further improvement of an embodiment of the present invention, the first protrusion and the second protrusion are oriented toward the hollow structure of the cavity recess.

As a further improvement of an embodiment of the present invention, the first protrusion is formed by splicing a plurality of protrusions distributed at intervals, and/or the second protrusion is formed by splicing a plurality of protrusions distributed at intervals.

As a further improvement of an embodiment of the present invention, the first convex force application direction perpendicular to the incisal end of the tooth to be corrected, and the second convex force application direction perpendicular to the lingual surface or labial surface of the tooth to be corrected.

As a further improvement of an embodiment of the present invention, the second protrusion is located between the incisal end of the tooth to be corrected and the lingual fossa.

As a further improvement of an embodiment of the present invention, the second protrusion is disposed adjacent to the first protrusion, and a gap is provided between the second protrusion and the first protrusion.

As a further improvement of an embodiment of the present invention, the first protrusions and the second protrusions are connected to each other.

As a further improvement of an embodiment of the present invention, the longitudinal section of the depressed ridge along the second direction is L-shaped, the second direction is the direction of the incisal end of the tooth to be corrected toward the gingival end, and the longitudinal section passes through the first protrusion and the second protrusion simultaneously.

As a further improvement of an embodiment of the present invention, the depression ridge is configured to: when the second bulge is unfolded to be flush with the first bulge, the outer contour of the pressing ridge is one of a long strip shape, a square shape, a round shape, an oval shape, a blunt angle shape, a crescent shape, a wave shape and a fold line shape.

As a further improvement of an embodiment of the present invention, the maximum depth of the depressed ridge ranges from 0.05mm to 0.5mm.

As a further improvement of one embodiment of the present invention, the range of the opening area of the depressed ridge connecting the appliance body is 0.5mm ² -18mm ² 。

As a further improvement of an embodiment of the present invention, the area of the opening of the depressed ridge connecting to the appliance body is equal to the contact area of the depressed ridge and the tooth to be corrected.

As a further improvement of an embodiment of the present invention, when the depressed ridge is located on a side of the long axis of the dental body close to the mesial surface, a first minimum distance between the depressed ridge and the mesial surface ranges from 0.5mm to 3mm, and when the depressed ridge is located on a side of the long axis of the dental body close to the distal surface, a second minimum distance between the depressed ridge and the distal surface ranges from 0.5mm to 3mm.

As a further improvement of an embodiment of the present invention, the range of the first minimum distance is 1mm to 2mm, and the range of the second minimum distance is 1mm to 2mm.

As a further improvement of an embodiment of the present invention, the third minimum distance between the second projection near the bottom edge of the gingival end and the gingival end ranges from 0.5mm to 3mm.

As a further improvement of an embodiment of the present invention, the third minimum distance ranges from 1mm to 2mm.

As a further improvement of an embodiment of the present invention, the orthodontic appliance has a plurality of depressed ridges spaced apart from each other corresponding to one tooth to be corrected.

As a further improvement of an embodiment of the present invention, the orthodontic appliance has two depressed ridges, and the two depressed ridges are respectively located on two sides of a long axis of a tooth body of the same tooth to be corrected.

As a further improvement of an embodiment of the present invention, the orthodontic appliance has a plurality of depressed ridges corresponding to a plurality of teeth to be corrected.

Compared with the prior art, the utility model discloses an embodiment's beneficial effect lies in: the utility model relates to an embodiment's first protruding correspondence treats the eager end setting of correcting the tooth, and first arch is concentrated and is produced the power of holding down that is on a parallel with the direction to the tip, can assist the operation of holding down of just abnormal ware of correcting of dentistry, and the power of holding down that first arch produced can accurate control, avoids producing the effort of other directions, and then improves first bellied effect of holding down.

Drawings

Fig. 1 is a perspective view of an orthodontic appliance with pressure ridges according to a first embodiment of the present invention;

fig. 2 is a simplified view of a first embodiment of an orthodontic appliance with pressure ridges of the present invention being worn on a tooth;

FIG. 3 is an enlarged view of the pressure ridge region of FIG. 2;

fig. 4 is a mechanical analysis diagram of the first embodiment of the present invention in which an orthodontic appliance without pressure ridges is worn on a tooth to be corrected;

fig. 5 is a mechanical analysis diagram of the first embodiment of the present invention in which the orthodontic appliance with pressure ridges is worn on a tooth to be corrected;

FIG. 6 is another enlarged view of the pressure ridge region of FIG. 2;

FIG. 7 is a schematic view of another specific example orthodontic appliance with a pressure ridge;

fig. 8 is a schematic view of simulation calculation results of resultant moment expressions of the dental appliance without adding the pressure ridges and the dental appliance with adding the pressure ridges corresponding to different lip inclination angles of the tooth to be corrected according to the first embodiment of the present invention;

fig. 9 is a schematic view of a pressure ridge in a different setting position according to a first embodiment of the present invention;

fig. 10 is a schematic view of the resultant moment of the pressure ridge in different positions according to the first embodiment of the present invention;

fig. 11a to 11d are schematic diagrams of different patterns formed by enclosing the outer contour of the connection end according to the first embodiment of the present invention;

fig. 12 is a schematic view of the relationship between the depth of the pressure ridge and the torque produced in the first embodiment of the present invention;

fig. 13 is a perspective view of an orthodontic appliance with depressed ridges that include only first projections according to a second embodiment of the invention;

fig. 14 is a simplified view of a second embodiment of an orthodontic appliance with depressed ridges that include only first projections, as worn on a tooth;

fig. 15 is a simplified view of an orthodontic appliance corresponding to a tooth to be corrected according to a second embodiment of the invention, the depressed ridge comprising only the first protrusion;

fig. 16 is a perspective view of an orthodontic appliance having a depressed ridge comprising a first protrusion and a second protrusion according to a second embodiment of the present invention;

fig. 17 is a simplified illustration of a second embodiment of an orthodontic appliance of the invention being worn on a tooth, the orthodontic appliance having a depressed ridge comprising a first protrusion and a second protrusion;

fig. 18 is a simplified view of an orthodontic appliance corresponding to a tooth to be corrected according to a second embodiment of the present invention, the depressed ridge comprising a first protrusion and a second protrusion;

fig. 19 is a schematic view of a depressed ridge having first and second spaced apart protrusions according to a second embodiment of the present invention;

fig. 20 is a schematic view showing a position where depressed ridges are provided according to a second embodiment of the present invention;

fig. 21 is a schematic view of an orthodontic appliance containing three depressed ridges in accordance with a second embodiment of the invention;

fig. 22 is a perspective view of an orthodontic appliance with a twisted ridge according to a third embodiment of the present invention;

fig. 23 is a simplified view of a third embodiment of an orthodontic appliance with a twisted ridge of the present invention being worn on a tooth;

fig. 24 is a simplified view of an orthodontic appliance of a third embodiment of the invention corresponding to one tooth to be corrected;

fig. 25 is a schematic view of a plurality of twisted ridges of a third embodiment of the present invention on the labial surface of a tooth to be corrected;

FIG. 26 is a schematic view of a plurality of twisted ridges of a third embodiment of the present invention on the lingual surface of the same tooth to be corrected;

fig. 27 is a schematic view of a plurality of twisting ridges of a third embodiment of the present invention on the labial surface and the lingual surface of the same tooth to be corrected;

fig. 28 is a schematic flow chart illustrating a method for designing a pressure attachment according to an embodiment of the present invention;

FIG. 29 is a schematic view of an initial digital dental model according to an embodiment of the present invention;

FIG. 30 is a schematic view of an intermediate digital dental model according to an embodiment of the present invention;

FIG. 31 is a schematic view of a target digitized dental model according to an embodiment of the present invention;

FIG. 32 is a schematic view of a targeted digital appliance model in accordance with an embodiment of the present invention;

FIG. 33 is a schematic view of a target digital appliance model of an embodiment of the present invention worn on an initial digital dental model;

FIG. 34 is a simplified diagram of a target digital appliance model of an embodiment of the present invention being worn on an initial digital dental model;

FIG. 35 is a schematic flow chart illustrating a method for designing a pressure attachment according to an embodiment of the present invention;

FIG. 36 is a schematic flow chart diagram illustrating a method for designing a pressure attachment according to another embodiment of the present invention;

FIG. 37 is a schematic view of the digital dental model of the subject with the pressure attachment corresponding to the depressed ridge containing only the first protrusion;

FIG. 38 is a schematic view of a model of a digital appliance of the invention with a pressure attachment corresponding to a depressed ridge containing only first protrusions;

FIG. 39 is a schematic view of the digital dental model of the present invention with the pressure attachment corresponding to the depressed ridge comprising the first protrusion and the second protrusion;

FIG. 40 is a schematic view of a model of a digital appliance of the invention with a pressure attachment corresponding to a depressed ridge comprising a first protrusion and a second protrusion;

FIG. 41 is a schematic view of a digital dental model of a target when the pressure attachment of the present invention corresponds to a twisting ridge;

FIG. 42 is a schematic view of a model of a digital targeted appliance in the presence of a torsional ridge corresponding to a pressure attachment in accordance with the present invention;

FIG. 43 is a schematic block diagram of a processor of a design system in accordance with an embodiment of the present invention;

fig. 44 is a schematic flow chart illustrating a method of forming an orthodontic appliance according to an embodiment of the present invention;

FIG. 45 is a schematic view of an intermediate digital appliance model according to an embodiment of the present invention;

fig. 46 is a schematic block diagram of a processor of a molding system according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes that can be made by those skilled in the art according to these embodiments are all included in the scope of the present invention.

Referring to fig. 1 to 3, a first embodiment of the present invention is an orthodontic appliance 700 with a pressure ridge 701.

The orthodontic appliance 700 includes an appliance body 702 forming a cavity S to receive a tooth, and a pressure ridge 701 integrally connecting the appliance body 702.

The pressure ridge 701 comprises a connecting end 703 connected with the appliance body 702, an acting end 704 which is far away from the appliance body 702 and is positioned in the cavity S, and an inner wall 705 connected with the connecting end 703 and the acting end 704, wherein the acting end 704 is in a point shape or a linear shape, and the acting end 704 is arranged corresponding to the tongue protuberance D of the tooth T to be corrected.

In the present embodiment, the tooth T to be corrected is an incisor or a cuspid, for example.

Here, when the orthodontic appliance 700 is used to depress the tooth T to be corrected, the appliance body 702 has a depressing force, and the action end 704 is disposed corresponding to the lingual protuberance D of the tooth T to be corrected, and the action end 704 generates an action force on the lingual protuberance D to reduce the labial fitting moment of the tooth T to be corrected, that is, the tooth T to be corrected can be prevented from toppling towards the labial surface in the depressing process.

Specifically, referring to fig. 4 and 5, fig. 4 is a mechanical analysis diagram of the orthodontic appliance 800 without the pressure ridge being worn on the tooth T to be corrected, fig. 5 is a mechanical analysis diagram of the orthodontic appliance 700 with the pressure ridge 701 being worn on the tooth T to be corrected, and the

orthodontic appliance

700 and 800 is worn on the tooth T to be corrected with the lip inclination angle of 45 ° as an example for explanation.

With reference to fig. 4, when the orthodontic appliance 800 does not have a pressure ridge, the two sides of the top end of the tooth T to be corrected are acted by the first acting force F1 'and the second acting force F2', and at this time, it can be known from mechanical analysis that the resultant moment M 'received by the tooth T to be corrected is a labial resultant moment, and the resultant moment M' can cause a labial inclination phenomenon of the tooth T to be corrected.

With reference to fig. 5, when the orthodontic appliance 700 has the pressure ridge 701, the pressure ridge 701 abuts against the area of the lingual protuberance D of the tooth T to be corrected, both sides of the top end of the tooth T to be corrected are acted by the first acting force F1 and the second acting force F2, the lingual protuberance D of the tooth T to be corrected is acted by the third acting force F3, and the third acting force F3 is closer to the impedance center of the tooth T to be corrected, at this time, it can be known from mechanical analysis that the resultant moment M of the tooth T to be corrected is still the labial resultant moment, but the resultant moment M is significantly smaller than the resultant moment M', that is, the labial resultant moment is significantly reduced by increasing the pressure ridge 701, thereby reducing the risk of labial inclination.

It can be understood that, in actual operation, through reasonable selection of the design value of the pressure ridge 701, the labial resultant moment can be directly eliminated, and the incisor can be completely prevented from falling to the labial surface in the process of depression.

When the orthodontic appliance 700 is used to adduct incisors, the action end 704 is positioned to correspond to the labial surface of the incisors, the action end 704 is preferably positioned near the edge of the appliance body 702, and the action end 704 exerts a force on the incisors to increase the labial torque of the incisors T, so as to reduce the risk of torque loss during adduction of the incisors.

In addition, "the action end 704 is in a point shape or a straight shape" means that the end of the action end 704 away from the connection end 703 is in a point shape or a straight shape, so that when the orthodontic appliance 700 is worn on a tooth, the action end 704 is in point contact or line contact with incisors, the contact area between the action end 704 and the incisors is small, when the incisors act on the pressure ridges 701, the pressure ridges 701 themselves are deformed first, and when the deformation amount of the pressure ridges 701 itself is large, the appliance main body 702 around the pressure ridges 701 is driven to deform, so that the gaps between the appliance main body 702 and the incisors are enlarged, that is, the pressure ridges 701 in the embodiment can play a buffering role, the setting of the pressure ridges 701 has a small influence on the fitting degree between the appliance main body 702 and the incisors, and the stability of the entire orthodontic appliance 700 on the action of the incisors can be improved.

In this embodiment, pressure ridge 701 is a hollow structure recessed toward the cavity.

That is, the pressure ridge 701 may be integrally formed with the appliance body 702, and the pressure ridge 701 is a negative pressure ridge, and at this time, the connection end 703 of the pressure ridge 701 is substantially a hollow structure.

In the embodiment, taking the pressure ridge 701 as an example for depressing the tooth T to be corrected, the pressure ridge 701 is disposed perpendicular to the tongue prominence D, so that the stability of the fit between the pressure ridge 701 and the tooth T to be corrected can be improved, and the transmission of the acting force is facilitated.

Specifically, referring to fig. 6, a direction of the connecting end 703 toward the acting end 704 is defined as a first direction X, the acting end 704 abuts against a contact portion D1 of the lingual protuberance D when the orthodontic appliance 700 is worn on a tooth, and the first direction X is perpendicular to a tangential plane S1 passing through the contact portion D1.

That is, the pressure ridge 701 extends toward the first direction X, the tongue protuberance D is an irregular region, the tangent plane S1 is a plane when the contact portion D1 is located at the plane, the first direction X is perpendicular to the plane, and the tangent plane S1 is a tangent plane passing through a curved surface including the contact portion D1 when the contact portion D1 is located at an irregular curved surface, so that the pressure ridge 701 can vertically act on the tongue protuberance D in cooperation with point contact or line contact between the acting end 704 and the tongue protuberance D, and the action efficiency and stability can be greatly improved.

Of course, the pressure ridge 701 may have other structures, and in a specific example, in conjunction with fig. 7, the inner wall 705 'of the pressure ridge 701' has a plurality of protrusions 706 'formed by being recessed toward the cavity S, so that the entire pressure ridge 701' is substantially spring-shaped, which ensures stable contact between the pressure ridge 701 'and the tongue ridge D, and thus the force application control is more precise, and even if the pressure ridge 701' is deformed to separate the acting end 704 'from the tongue ridge D, the plurality of protrusions 706' may continue to abut against the tongue ridge D.

Meanwhile, the spring-type pressure ridges 701' can play a role in buffering, the influence of the pressure ridges 701' on the fitting degree of the appliance body 702' is reduced, and the risk of sleeve detachment is reduced.

In this example, the plurality of protrusions 706 'and the active ends 704' are spaced apart.

Specifically, the protrusion 706 'may be a ring structure disposed around the inner wall 705', or a spiral structure, which may improve the cushioning performance of the pressure ridge 701', and the protrusions 706' may be uniformly distributed, or may be distributed according to a certain rule according to a stress condition, but not limited thereto.

It can be understood that the moment expression of the pressure ridge of the same design amount is different for different inclination angles of the T lip of the tooth to be corrected.

With reference to fig. 8, a simulation calculation result of resultant moment expression of the orthodontic appliance without the pressure ridge and the orthodontic appliance with the pressure ridge corresponding to different T-lip inclination angles of the tooth to be corrected is illustrated.

Here, it is indicated that the inclination angles of the lips of the teeth to be corrected are respectively expressed by the resultant moments of 15 °, 25 °, 30 ° and 45 °, and when the pressure ridge is not added to the orthodontic appliance, the teeth to be corrected having the inclination angles of 15 ° have a lingual surface resultant moment, and the teeth to be corrected having the inclination angles of 25 °, 30 ° and 45 ° all have a labial resultant moment, that is, when the inclination angle of the lips of the teeth to be corrected is larger, the possibility of the labial resultant moment is larger.

When the pressure ridge is added to the orthodontic appliance, the teeth to be corrected with the lip inclination angles of 15 degrees, 25 degrees, 30 degrees and 45 degrees are all shown to have the lingual resultant moment, namely the problem of the labial inclination of the teeth to be corrected can be solved by adding the pressure ridge, and the labial resultant moments of the teeth to be corrected are different according to different labial inclination angles (namely the labial resultant moments when the pressure ridge is not added to the orthodontic appliance are different), the pressure ridge with the proper design amount can be selected according to different labial inclination angles, and the design of the pressure ridge can refer to the design method of the pressure ridge.

In the present embodiment, the design value of the pressure ridge 701 includes the installation position and size of the pressure ridge 701, and the selection of the design value of the pressure ridge 701 will be described in detail below.

In this embodiment, the perpendicular distance from any point on the outer contour of the connection end 703 of the pressure ridge 701 to the edge of the appliance body 702 is not less than 2mm.

Here, the "outer contour of the connection end 703" refers to a connection region of the pressure ridge 701 and the appliance body 702.

That is to say, the setting position of the pressure ridge 701 needs to satisfy that the vertical distance from the bottommost end of the connecting end 703 to the edge of the appliance body 702 is not less than 2mm, and when the orthodontic appliance 700 is worn on the tooth, the edge of the appliance body 702 is the boundary position of the gum and the appliance body 702.

With reference to fig. 9 and 10, the resultant moment of the pressure ridge 701 and the edge of the appliance body 702 at different distances is illustrated, and the pressure ridge 701 is provided at points a, B, and C, respectively.

It can be seen that, the closer the pressure ridge 701 is to the edge of the appliance body 702, the larger the lingual moment of articulation, i.e. the stronger the weakening effect on the lip tilt phenomenon, it is worth noting that, it is verified that, when the pressure ridge 701 is too close to the edge of the appliance body 702, the lingual moment of articulation can be greatly weakened, this is because the force application effect of the pressure ridge 701 on the tooth T to be corrected can be influenced when being close to the edge of the appliance body 702, therefore, the vertical distance from the bottommost end of the connecting end 703 to the edge of the appliance body 702 is not less than 2mm in the present embodiment.

The effective effect of the pressure ridge 701 is also determined by the size of the pressure ridge 701.

Specifically, the area range formed by enclosing the outer contour of the connecting end 703 of the pressure ridge 701 is 4mm ² -6mm ² 。

That is, the area of the connection region of the pressure ridge 701 and the appliance body 702 is in the range of 4mm ² -6mm ² In the direction from the connecting end 703 to the acting end 704, the sectional area of the pressure ridge 701 gradually decreases until the sectional area approaches zero at the acting end 704, thereby avoiding the difficulty in demolding during the molding process of the orthodontic appliance 700.

It will be appreciated that too small an area cannot be used inThe pressure ridge 701 forms an effective pressure contact with the lingual protuberance D, and when the area is too large, the stable fit between the appliance body 702 and the tooth, i.e., the degree of fit, is affected, so the embodiment defines the area range as 4mm ² -6mm ² The effective pressure contact and better fitting degree can be simultaneously ensured.

Referring to fig. 11a to 11d, the outer contour of the connection end 703 is illustrated to form a pattern, and it can be seen that the outer contour of the connection end 703 forms a symmetrical pattern, which may be an ellipse, a rectangle, a crescent, a diamond, or the like.

The length of the line segment of the symmetry axis of the symmetric pattern is not less than 2mm, that is, the symmetric pattern has the line segment as the symmetry axis, and the length of the line segment is not less than 2mm, for example, the length and the width of the rectangular symmetric pattern are not less than 2mm, so as to avoid that the symmetric pattern is a long and narrow pattern and cannot provide effective acting force for the tooth T to be corrected.

In addition, the perpendicular distance from the active end 704 to the connection end 703 of the pressure ridge 701 ranges from 1mm to 2mm, i.e., the depth of the pressure ridge 701 ranges from 1mm to 2mm.

Referring to fig. 12, a schematic diagram of a relationship between the depth H of the pressure ridge 701 and the generated moment M is illustrated, and it can be seen that when the depth H is too small, the pressure ridge 701 cannot generate the moment M on the tooth T to be corrected, and then when the depth H increases, the moment M is in direct proportion to the depth H, and when the depth H reaches a certain value, the moment M basically remains unchanged, and it can be understood that the depth H too much affects the fitting degree of the corrector body 702, so the depth range of the pressure ridge 701 is defined as 1mm-2mm in the present embodiment, which can effectively generate the moment M, and can ensure the fitting degree of the corrector body 702.

Referring to fig. 13 to 15, a second embodiment of the present invention is an orthodontic appliance 700a with depressed ridges 701a.

The orthodontic appliance 700a includes an appliance body 702a forming a cavity S to receive a tooth, and a depressed ridge 701a integrally connecting the appliance body 702 a.

The depressed ridge 701a includes a first protrusion 7011a protruding toward the cavity S, and the first protrusion 7011a is disposed corresponding to the incisal end T1 of the tooth T to be corrected.

In the present embodiment, the tooth to be corrected T is at least one of an incisor, a cuspid, and a premolar, and here, the tooth to be corrected T is an incisor as an example.

Here, the tooth T to be corrected has a labial surface M1 near the labial side, a lingual surface M2 near the lingual side, a mesial surface M3 facing the facial midline, and a distal surface M4 away from the facial midline, and the "incisal end T1" of the tooth T to be corrected means a portion of the tooth T to be corrected having an incisal bite function, i.e., a region surrounded by the labial surface M1, the lingual surface M2, the mesial surface M3, and one end of the distal surface M4 away from the gingival end T2.

When just abnormal ware 700a is used for the depression to treat when correcting tooth T, it has the depression force to correct ware body 702a, and first arch 7011a corresponds the tangent end T1 setting of treating correcting tooth T, first arch 7011a concentrates on the depression force that produces the direction of being on a parallel with the depression direction to tangent end T1, can assist just abnormal ware 700 a's operation of depressing of just abnormal ware, and the depression force that first arch 7011a produced can accurate control, avoid producing the effort of other directions, and then improve first protruding 7011 a's the effect of depressing.

In the present embodiment, the first protrusion 7011a covers the incisal end T1 of the tooth T to be corrected in the first direction, which is the direction in which the labial surface M1 faces the lingual surface M2.

That is, the first protrusion 7011a covers the cut end T1 in the thickness direction of the tooth T to be corrected, which can increase the contact area between the first protrusion 7011a and the cut end T1, thereby improving the uniformity and stability of the depressing force generated by the first protrusion 7011 a.

In this embodiment, with reference to fig. 16 to 18, the depressed ridge 701a further includes a second protrusion 7012a, and the second protrusion 7012a is disposed corresponding to the lingual surface M2 or the labial surface M1 of the tooth T to be corrected.

That is, the depressed ridge 701a includes the first protrusion 7011a and the second protrusion 7012a, the first protrusion 7011a and the second protrusion 7012a act on the tooth T to be corrected simultaneously, and the second protrusion 7012a can be used to control the torque of the tooth T to be corrected so as to prevent the tooth T to be corrected from generating an adverse rotation during the depression process.

Here, taking the second protrusion 7012a as an example to be located on the lingual side M2 of the tooth T to be corrected, the angle between the first protrusion 7011a and the second protrusion 7012a is substantially a right angle.

Specifically, the second protrusion 7012a is located between the cut end T1 of the tooth T to be corrected and the fossa, and a relatively flat region is provided between the cut end T1 and the fossa, at this time, the matching degree between the second protrusion 7012a and the region is relatively high, that is, the contact area between the second protrusion 7012a and the region is relatively large, so that the strength and stability of the force applied by the second protrusion 7012a can be improved.

In the actual lowering operation, part of the teeth T to be corrected can incline towards the tongue while being lowered, so that the tongue inclination phenomenon of the teeth T to be corrected can be caused, and then the tooth cusp is raised.

It can be seen that the depressed ridge 701a of the present embodiment includes the first protrusion 7011a and the second protrusion 7012a, which can reduce the risk of tongue inclination while assisting the depression, thereby achieving the deep-coverage therapeutic effect.

In this embodiment, the first protrusion 7011a and the second protrusion 7012a are hollow structures recessed toward the cavity S, the force application direction of the first protrusion 7011a is perpendicular to the incisal end T1 of the tooth T to be corrected, and the force application direction of the second protrusion 7012a is perpendicular to the lingual surface M2 or the labial surface M1 of the tooth T to be corrected, so that the stability of the force application can be improved.

The first protrusion 7011a and the second protrusion 7012a of the depressed ridge 701a may have various forms.

In a particular example, the first protrusion 7011a and the second protrusion 7012a are interconnected.

Here, the first protrusion 7011a and the second protrusion 7012a are integrally connected to each other, which can reduce the difficulty of molding.

In another specific example, in conjunction with fig. 19, the second protrusion 7012a is disposed adjacent to the first protrusion 7011a with a gap between the second protrusion 7012a and the first protrusion 7011 a.

Here, the second protrusion 7012a and the first protrusion 7011a are disposed close to each other but not connected together, a boundary line E is formed between the cut end T1 and the tongue surface M2, and the second protrusion 7012a is disposed close to the boundary line E, so that the first protrusion 7011a and the second protrusion 7012a can be independently designed according to actual requirements, and the degree of freedom is high.

In addition, the first protrusion 7011a may be a unitary structure or may be formed by splicing a plurality of protrusions distributed at intervals.

Likewise, the second protrusion 7012a can be a unitary structure or can be formed by splicing a plurality of protrusions that are spaced apart.

In this embodiment, a longitudinal section F of the depressed ridge 701a along a second direction is L-shaped, the second direction is a direction from the cut end T1 of the tooth T to be corrected to the gum end T2, and the longitudinal section F passes through the first protrusion 7011a and the second protrusion 7012a at the same time.

That is, the longitudinal section F is a section obtained by cutting the depressed ridge 701a parallel to the plane of the mesial plane M3 or the distal plane M4, that is, the longitudinal section F is a perpendicular projection of the depressed ridge 701a on the extension plane of the mesial plane M3 or the distal plane M4.

Note that, for different forms of the depressed ridge 701a, the L shape may be a continuous L shape or an intermittent L shape.

Depression ridge 701a is configured to: when the second protrusion 7012a is spread to be flush with the first protrusion 7011a, the outer contour of the depressed ridge 701a is one of a long bar shape, a square shape, a circular shape, an oval shape, a blunt angle shape, a crescent shape, a wave shape, and a broken line shape.

It should be noted that "the second protrusion 7012a is spread to be flush with the first protrusion 7011 a" means that the orthodontic appliance 700a is spread such that the first opening 7013a of the first protrusion 7011a and the second opening 7014a of the second protrusion 7012a are located on the same plane, and at this time, the first opening 7013a and the second opening 7014a enclose an outer contour, which is defined as an outer contour of the depressed ridge 701a.

The first opening 7013a and the second opening 7014a are openings of the first protrusion 7011a and the second protrusion 7012a at the appliance body 702a, respectively.

In addition, the outer contour may be a continuous outer contour or may be an intermittent outer contour for different forms of the depressed ridge 701a.

In this embodiment, taking the outer contour of the depressed ridge 701a as a long bar as an example, the first protrusion 7011a is a long bar structure extending along the labial surface M1 toward the lingual surface M2, the second protrusion 7012a is a long bar structure extending along the incisal end T1 toward the gingival end T2, the first protrusion 7011a and the second protrusion 7012a are mutually communicated and perpendicular, and the depressed ridge 701a is an L-shaped concave structure protruding toward the cavity S.

In this embodiment, the depth of the first protrusion 7011a and the depth of the second protrusion 7012a may be equal or unequal, which may be determined according to actual conditions.

Here, "depth" defines the degree of concavity of the first protrusion 7011a and the second protrusion 7012a, and when the first protrusion 7011a is a concavity having a non-uniform depth, "depth of the first protrusion 7011 a" means the maximum depth of the first protrusion 7011a, and similarly, when the second protrusion 7012a is a concavity having a non-uniform depth, "depth of the second protrusion 7012 a" means the maximum depth of the second protrusion 7012a.

In the present embodiment, the maximum depth of the depressed ridge 701a ranges from 0.05mm to 0.5mm.

Here, a reasonable depth of the depressed ridge 701a is designed, so that on one hand, it is avoided that the depth of the depressed ridge 701a is too small to generate effective acting force on the tooth T to be corrected, and on the other hand, it is avoided that the depth of the depressed ridge 701a is too large to affect the fitting degree of the orthodontic appliance 700a and the tooth T to be corrected.

In this embodiment, the opening area of the depressed ridge 701a connected to the appliance body 702a is equal to the contact area between the depressed ridge 701a and the tooth T to be corrected, which facilitates the molding of the depressed ridge 701a and increases the contact area between the depressed ridge 701a and the tooth T to be corrected.

The opening area here means the total area of the openings of the first protrusion 7011a and the second protrusion 7012a.

The area of the opening of the depressed ridge 701a connected to the appliance body 702a is 0.5mm ² -18mm ² 。

Here, a reasonable opening area of the depressed ridge 701a is designed, on one hand, it is avoided that the opening area of the depressed ridge 701a is too small and an effective acting force cannot be generated on the tooth T to be corrected, and on the other hand, it is avoided that the opening area of the depressed ridge 701a is too large and the fitting degree of the orthodontic appliance 700a and the tooth T to be corrected is affected.

In the present embodiment, referring to fig. 20, when the depressing ridge 701a is located on the side of the long axis Z of the tooth body near the mesial surface M3, the first minimum distance L1 between the depressing ridge 701a and the mesial surface M3 is in the range of 0.5mm to 3mm.

That is, when the depressed ridge 701a is closer to the mesial surface M3, the first minimum distance L1 between the edge of the depressed ridge 701a on the side closer to the mesial surface M3 and the mesial surface M3 ranges from 0.5mm to 3mm.

When the depressed ridge 701a is located on the side of the long axis Z of the tooth body near the distal plane M4, the second minimum distance L2 between the depressed ridge 701a and the distal plane M4 ranges from 0.5mm to 3mm.

That is, when the depressing ridge 701a is closer to the distal plane M4, the second minimum distance L2 between one side edge of the depressing ridge 701a closer to the distal plane M4 and the distal plane M4 ranges from 0.5mm to 3mm.

In a specific example, the first minimum distance L1 ranges from 1mm to 2mm, and the second minimum distance L2 ranges from 1mm to 2mm.

Here, the reasonable distances between the depressed ridge 701a and the mesial surface M3 and the distal surface M4 are designed, so that the situation that the depressed ridge 701a is too close to the mesial surface M3 or the distal surface M4 and cannot generate effective acting force on the tooth T to be corrected is avoided, and meanwhile, the situation that the depressed ridges 701a of the adjacent tooth T to be corrected are too close to each other and interfere with each other is avoided.

In this embodiment, third minimum distance L3 between bottom edge 7015a of second protrusion 7012a near gingival end T2 and gingival end T2 ranges from 0.5mm to 3mm.

Here, the gingival end T2 is the bottom edge of the appliance body 702a, i.e., the third minimum distance L3 between the bottom edge 7015a of the second protrusion 7012a and the bottom edge of the appliance body 702a, is in the range of 0.5mm to 3mm.

In a specific example, the third minimum distance L3 ranges from 1mm to 2mm.

Here, a reasonable distance between the depressed ridge 701a and the gingival end T2 is designed, so that on one hand, the depressed ridge 701a is prevented from being too close to the gingival end T2 and thus failing to play a role in reducing the risk of tongue inclination, and on the other hand, the depressed ridge 701a is prevented from being too close to the gingival end T2 and thus affecting the fitting degree of the orthodontic appliance 700a and the tooth T to be corrected.

In other embodiments, the orthodontic appliance 700a has a plurality of depressed ridges 701a spaced apart from each other corresponding to one tooth T to be corrected.

Here, taking the orthodontic appliance 700a having two depressed ridges 701a as an example, the two depressed ridges 701a are respectively located on two sides of the long axis Z of the tooth body of the same tooth T to be corrected, and the double-ridge function of the tooth T to be corrected can effectively improve the uniformity of the force application.

The two depressed ridges 701a may be different depressed ridges.

Of course, the orthodontic appliance 700a may also include other numbers of depressed ridges 701a, for example, in conjunction with fig. 21, the orthodontic appliance 700a includes three depressed ridges 701a located on the same tooth to be corrected and distributed at intervals, and the setting position of each depressed ridge 701a may be determined according to specific requirements.

The orthodontic appliance 700a has a plurality of depressed ridges 701a corresponding to the plurality of teeth T to be corrected, that is, when there are a plurality of teeth T to be corrected, the orthodontic appliance 700a has depressed ridges 701a corresponding to each tooth T to be corrected, and the number, position, and form of the depressed ridges 701a corresponding to each tooth T to be corrected can be independently designed.

Referring to fig. 22 to 24, a third embodiment of the orthodontic appliance 700b of the present invention is shown with a twisted ridge 701b.

The orthodontic appliance 700b includes an appliance body 702b forming a cavity S to receive a tooth, and a twisted ridge 701b integrally connecting the appliance body 702 b.

The torsional ridge 701b protrudes towards the cavity S, the torsional ridge 701b is arranged corresponding to the lingual surface M2 and/or the labial surface M1 of the tooth T to be corrected, the torsional ridge 701b is positioned on one side of the long axis Z of the tooth body, the extending direction of the torsional ridge 701b is the direction in which the incisor end T1 of the tooth to be corrected faces the gingival end T2, and the tooth T to be corrected is an incisor or cuspid.

Here, the tooth to be corrected T has a labial surface M1 near the labial side, a lingual surface M2 near the lingual side, a mesial surface M3 facing the facial midline, and a distal surface M4 away from the facial midline.

The phrase "the twisted ridge 701b is located on the side of the tooth long axis Z" means that when the twisted ridge 701b is located on one surface (labial surface M1 or lingual surface M2), the twisted ridge 701b is located on the side of the tooth long axis Z of the surface.

The setting positions of the torsion ridge 701b include: the torsional ridge 701b is positioned on the lingual surface M2, and the torsional ridge 701b is positioned on one side of the long axis Z of the tooth body close to the mesial surface M3; the torsional ridge 701b is positioned on the lingual surface M2, and the torsional ridge 701b is positioned on one side of the long axis Z of the tooth body close to the distal surface M4; the twisting ridge 701b is positioned on the labial surface M1, and the twisting ridge 701b is positioned on one side of the long axis Z of the tooth body close to the mesial surface M3; the twisting ridge 701b is located on the labial surface M1, and the twisting ridge 701b is located on one side of the long axis Z of the dental body close to the far-middle surface M4.

The torsion ridges 701b of the present embodiment may concentrate on the tooth T to be corrected to generate a torsion force, which acts to rotate around the tooth long axis Z, and then control the tooth T to be corrected to rotate to a desired position, for example, in the correction process of aligning front teeth (which may be incisors or cuspids, etc.), the torsion ridges 701b may realize remaining micro torsion.

In the present embodiment, the twisted ridges 701b are hollow structures recessed toward the cavity S, and the force application direction of the twisted ridges 701b is perpendicular to the lingual surface M2 and/or the labial surface M1 of the tooth T to be corrected.

In this embodiment, the twisted ridge 701b may have a continuous structure, which may reduce the difficulty of molding.

Or, the torsion ridge 701b is formed by splicing a plurality of protrusions distributed at intervals, and the plurality of protrusions can be independently designed according to actual requirements, so that the degree of freedom is high.

In the present embodiment, the outer contour of the twisting ridge 701b is one of a long bar shape, a square shape, a circular shape, an oval shape, a blunt angle shape, a crescent shape, a wave shape, and a broken line shape.

The outer contour of the torsion ridge 701b refers to the outer contour of the opening of the torsion ridge 701b in the appliance body 702 b.

In addition, the outer contour may be a continuous outer contour or an intermittent outer contour for different forms of the torsion ridge 701b.

In the present embodiment, the maximum depth of the twisting ridge 701b ranges from 0.1mm to 1mm.

Here, a reasonable depth of the torsion ridge 701b is designed, on one hand, it is avoided that the depth of the torsion ridge 701b is too small to generate an effective acting force on the tooth T to be corrected, and on the other hand, it is avoided that the depth of the torsion ridge 701b is too large to affect the fitting degree of the orthodontic appliance 700b and the tooth T to be corrected.

In the embodiment, the opening area of the twisted ridge 701b connected to the appliance body is equal to the contact area of the twisted ridge 701b and the tooth T to be corrected, so that the twisted ridge 701b can be conveniently molded, and the contact area of the twisted ridge 701b and the tooth T to be corrected can be increased.

The opening area range of the torsion ridge 701b connected with the appliance body 702b is 0.25mm ² -36mm ² 。

In a specific example, the open area ranges from 1mm ² -12mm ² 。

Here, a reasonable opening area of the torsion ridge 701b is designed, on one hand, it is avoided that the opening area of the torsion ridge 701b is too small to generate an effective acting force on the tooth T to be corrected, and on the other hand, it is avoided that the opening area of the torsion ridge 701b is too large to affect the fitting degree of the orthodontic appliance 700b and the tooth T to be corrected.

In the present embodiment, the tooth T to be corrected has a first maximum width W1 in a direction from the mesial plane M3 to the distal plane M4, and the first vertical distance L4 between the center of the twisted crest 701b and the long axis Z of the tooth body is not less than 1/10 of the first maximum width W1.

Meanwhile, a second vertical distance L5 between the center of the torsion ridge 701b and the mesial plane M3 or distal plane M4 to which the torsion ridge 701b is close is not less than 1/10 of the first maximum width W1.

That is, when the torsional ridge 701b is located between the long axis Z of the dental body and the mesial plane M3, the distance between the center of the torsional ridge 701b and the mesial plane M3 is the second vertical distance L5, and when the torsional ridge 701b is located between the long axis Z of the dental body and the distal plane M4, the distance between the center of the torsional ridge 701b and the distal plane M4 is the second vertical distance L5, that is, the torsional ridge 701b is located between the long axis Z of the dental body and the mesial plane M3, or the torsional ridge 701b is located between the long axis Z of the dental body and the distal plane M4, and there is a gap between the torsional ridge 701b and the long axis Z of the dental body, the mesial plane M3, and the distal plane M4.

In a specific example, neither the first vertical distance L4 nor the second vertical distance L5 is less than 1/5 of the first maximum width W1.

Here, the reasonable gap between the twisted ridge 701b and the tooth long axis Z, the mesial plane M3, and the distal plane M4 is designed, so that on one hand, the twisted ridge 701b is prevented from being too close to the tooth long axis Z to lose the twisting ability, and on the other hand, the twisted ridge 701b is prevented from being too close to the mesial plane M3 or the distal plane M4 to affect the fitting degree of the orthodontic appliance 700b and the tooth T to be corrected.

In the present embodiment, the tooth T to be corrected has a first maximum height H1 in the direction from the cut end T1 toward the gingival end T2, and the height H2 of the twisted ridge 701b in the direction from the cut end T1 toward the gingival end T2 is not more than 80% of the first maximum height H1.

In a particular example, the height H2 is no greater than 60% of the first maximum height H1, and the height H2 is no less than 10% of the first maximum height H1.

Here, a reasonable height of the torsion ridge 701b is designed, on one hand, it is avoided that the height of the torsion ridge 701b is too small to generate an effective acting force on the tooth T to be corrected, and on the other hand, it is avoided that the height of the torsion ridge 701b is too large to affect the fitting degree of the orthodontic appliance 700b and the tooth T to be corrected.

In this embodiment, the orthodontic appliance 700b has a plurality of twisting ridges 701b distributed at intervals corresponding to one tooth T to be corrected, and the twisting ability of the tooth T to be corrected can be effectively improved by the combined action of the plurality of twisting ridges 701b.

The distribution of the plurality of torsion ridges 701b includes:

(1) Referring to fig. 25, the plurality of twisting ridges 701b are located on the labial surface M1 of the same tooth T to be corrected, and the plurality of twisting ridges 701b are located on the same side of the long axis Z of the tooth body;

(2) Referring to fig. 26, the plurality of twisted ridges 701b are located on the lingual surface M2 of the same tooth T to be corrected, and the plurality of twisted ridges 701b are located on the same side of the long axis Z of the tooth body;

(3) Referring to fig. 27, the plurality of twisted ridges 701b are respectively located on the lingual surface M2 and the labial surface M1 of the same tooth T to be corrected, and the plurality of twisted ridges 701b are staggered from each other, for example, when two twisted ridges 701b are respectively located on the lingual surface M2 and the labial surface M1, the distance between the twisted ridge 701b located on the lingual surface M2 and the mesial surface M3 and the distance between the twisted ridge 701b located on the labial surface M1 and the mesial surface M3 are different.

The orthodontic appliance 700b has a plurality of twisted ridges 701b corresponding to the plurality of teeth T to be corrected, that is, when there are a plurality of teeth T to be corrected, the orthodontic appliance 700a has a twisted ridge 701b corresponding to each tooth T to be corrected, and the number, position, and form of the twisted ridges 701b corresponding to each tooth T to be corrected can be independently designed.

An embodiment of the present invention further provides a method for designing a pressure attachment, which may be the pressure ridge 701 according to the first embodiment, the pressing ridge 701a according to the second embodiment, and the twisting ridge 701b according to the third embodiment.

Of course, it is understood that the pressure attachment may be of other configurations.

Referring to fig. 28, a method for designing a pressure attachment according to an embodiment of the present invention includes:

s100: acquiring an initial digital dental model;

s102: acquiring a target digital appliance model containing a pressure attachment;

s104: wearing the target digital appliance model on the initial digital dental model, and applying force to the tooth to be corrected by the pressure accessory;

s106: calculating at least one of resultant moment, depression force and deformation of the target digital appliance model on the teeth to be corrected;

s108: and judging whether the pressure accessory is qualified or not according to the calculation result.

Here, for convenience of understanding, an application scenario of the pressure attachment is briefly described, but the present invention is not limited thereto, and the method for designing the pressure attachment according to the present embodiment may be applied to other scenarios.

The present embodiment takes a deep coverage application scenario as an example for explanation.

However, the anterior teeth depressing method in the current clinical correction often causes the anterior teeth to tilt towards labial surface or lingual side, which seriously affects the correction efficiency, and can cause the patient teeth to tilt greatly, even cause damage to the patient periodontal, and many doctors have made corresponding research and various attempts, but still have unconsciousness in controlling labial moment or lingual moment during the anterior teeth depressing process.

The main problems of the current orthodontic appliances in the anterior teeth depression process are that: orthodontic appliances do exert a depressing force on teeth, but the depressing force also generates a large labial moment or lingual moment, and the mere dependence on materials is insufficient for the control of the moment.

It can be seen that lip moment or tongue moment control is crucial in the anterior teeth depressing correction process, however, in actual operation, doctors determine a tooth arrangement scheme based on clinical medical experience, simulation verification of teeth in a clinical real state is lacked, the actual stress condition of teeth after wearing the orthodontic appliance cannot be evaluated, in the anterior teeth depressing correction process, doctors make a large number of attempts, not only a great deal of effort is invested, but also correction efficiency is influenced, and meanwhile, additional correction risks can be introduced.

In the embodiment, the pressure attachment can be added into the orthodontic appliance to effectively control the labial moment or the lingual moment, and more importantly, the embodiment can simulate the actual stress condition of the tooth to be corrected through a computer to judge whether the pressure attachment is qualified.

In addition, in other application scenarios, such as the case of front tooth alignment, the torsion moment can be effectively controlled by adding a pressure attachment to the orthodontic appliance in case the residual micro-torsion is not achieved in place or in case a further increase of the torsion moment is required.

Specifically, in the embodiment, the target digital appliance model with the pressure attachment is worn on the initial digital dental model, and the actual stress condition of the tooth to be corrected under the action of the target digital appliance model containing the pressure attachment can be simulated through the analysis of the computer, so that whether the pressure attachment is qualified or not is judged.

That is to say, this embodiment can guide and optimize the design of pressure annex through the simulation of computer, can effectively control the force application condition of the orthodontic correction ware of final shaping to the actual tooth of treating correcting, and then effectively avoid the lip to incline too big, the tongue inclines too big scheduling problem.

It is to be understood that the method for designing a pressure attachment according to the present embodiment is not limited to the application scenario of deep fitting, and the method for designing a pressure attachment according to the present embodiment may also be applied to other application scenarios for dental correction, such as an anterior adduction application scenario.

In this embodiment, with reference to fig. 29, step S100 specifically includes:

an initial digital dental model 100 is obtained, wherein the initial digital dental model 100 includes a digital grid model of a plurality of teeth with tooth roots, a digital grid model of periodontal ligament and a digital grid model of alveolar bone.

Here, the initial digital dental model 100 refers to a dental model to which a design amount is not currently added to a patient, and the initial digital dental model 100 may be obtained by obtaining a geometric model of teeth, periodontal ligament, and alveolar bone of a jaw of the patient through CT scanning.

Wherein, each tooth is an independent individual which is separated independently, the tooth root of each tooth is covered by the periodontal ligament, and meanwhile, the periodontal ligament is covered by the alveolar bone lattice.

In the present embodiment, the initial digital dental model 100 may be an upper jaw model or a lower jaw model, and the initial digital dental model 100 may be a complete dental model or a partial dental model.

In the case of correction using an orthodontic appliance, it is generally necessary to divide the correction into a plurality of successive stages (for example, 20 to 40 successive stages), each stage corresponding to one orthodontic appliance.

However, the jaw of each stage is different, for example, the arrangement of teeth is different in each stage, the orientation of the cavity for accommodating the tooth root of the alveolar bone may be different in each stage, and in order to check the orthodontic appliance at a certain stage, a geometric model of the jaw at the beginning of the stage, namely, the initial digitized jaw model 100 needs to be obtained.

In the present embodiment, the geometric model of the jaw at the end of a certain stage obtained by analyzing the effect of the orthodontic appliance at the stage by the finite element method can be used as the geometric model of the jaw at the beginning of the next stage.

At this time, the initial digitized dental model 100 is an initial dental finite element model 100, and the initial dental finite element model 100 includes a tooth finite element model, a periodontal ligament finite element model, and an alveolar bone finite element model.

In order to simplify the calculation and simulate the tooth layout condition in the oral cavity more accurately, the relative freedom degree of the contact surface of the tooth finite element model and the periodontal ligament finite element model can be restricted, namely the contact surface of the tooth root and the periodontal ligament is set not to generate relative displacement.

In particular, the contact surfaces of the tooth finite element model and the periodontal ligament finite element model can share a node, so that the relative freedom of the contact surfaces is limited.

Similarly, in order to simplify the calculation and more accurately simulate the tooth layout in the oral cavity, the relative degree of freedom of the contact surface between the alveolar bone finite element model and the periodontal ligament finite element model can be restricted, i.e. the contact surface between the alveolar bone and the periodontal ligament is set not to generate relative displacement.

Specifically, the contact surfaces of the alveolar bone finite element model and the periodontal ligament finite element model can share a node, so that the relative freedom degree of the contact surfaces of the alveolar bone finite element model and the periodontal ligament finite element model is limited.

In summary, based on the tooth finite element model, the periodontal ligament finite element model, the alveolar bone finite element model, and the constraint conditions, the initial dental finite element model 100 can be obtained.

Step S102 specifically includes:

referring to fig. 30, the action amount is designed on the initial digital dental model 100 to form an intermediate digital dental model 200;

the method comprises the following steps: a depression force is designed on the initial digital dental model 100 to form an intermediate digital dental model 200.

That is, in the present embodiment, the depressing operation of the anterior teeth is taken as an example, and the intermediate digital dental model 200 is obtained by performing finite element calculation on the initial digital dental model 100 based on the expected depressing force, and the intermediate digital dental model 200 is the digital dental model obtained by the depressing operation in the ideal state.

With reference to FIG. 31, a reference pressure attachment 301 is added to the intermediate digital dental model 200 to form a target digital dental model 300;

the method comprises the following steps: a reference pressure attachment 301 is added to the lingual eminence area of the tooth to be corrected of the intermediate digital dental model 200 to form the target digital dental model 300.

Referring to FIG. 32, a target digital appliance model 400 is generated from the target digital dental model 300, including a pressure attachment 401, the pressure attachment 401 matching the reference pressure attachment 301.

The pressure attachment 401 of the present embodiment is described by taking the pressure ridge 701 of the first embodiment as an example, and the pressure attachment 401 can be specifically described with reference to the description of the pressure ridge 701 of the first embodiment.

The method comprises the following steps: a target digital appliance model 400 is generated from the target digital dental model 300, the target digital appliance model 400 including an integral female pressure attachment 401 and shell appliance model 402.

In the prior art, a hot-pressing film forming process is a relatively common method for manufacturing an orthodontic appliance, in the method, a polymer film is subjected to hot-pressing film forming on a dental model to obtain a corresponding female die, and then the redundant part of the female die is cut off to obtain the orthodontic appliance.

In this embodiment, the target digital dental model 300 with the reference pressure attachment 301 may be obtained first, and then the hot-pressing film forming process is simulated on the target digital dental model 300 by a finite element analysis method to obtain the target digital appliance model 400 with the pressure attachment 401, because the hot-pressing film forming process is simulated, the inner contour of the target digital appliance model 400 is matched with the outer contour of the target digital dental model 300, and the pressure attachment 401 is also matched with the reference pressure attachment 301.

The target digital appliance model 400 of the present embodiment corresponds to a shell-shaped dental appliance including a female pressure attachment 401 and a shell-shaped appliance model 402 which are integrated, and at this time, the reference pressure attachment 301 added to the target digital dental model 300 is a recessed portion, and the pressure attachment 401 is a female pressure attachment 401 recessed toward a cavity in which the shell-shaped appliance model 402 accommodates teeth.

Of course, in other embodiments, other forms of appliances are possible, or pressure attachments are in other forms of addition.

In addition, the intermediate digital dental model 200, the target digital dental model 300, and the target digital appliance model 400 are all finite element models.

Referring to fig. 33, in step S104, the target digital appliance model 400 is worn on the initial digital dental model 100, and the pressure attachment 401 applies force to the tooth to be corrected.

Here, the finite element model of the target digital appliance model 400 is worn on the finite element model of the initial digital dental model 100, that is, the finite element model of the dental jaw and the finite element model of the orthodontic appliance are constrained and combined to simulate the actual appliance wearing process.

That is to say, the target digital appliance model 400 with the pressure attachment 401 added is interference-fitted to the initial digital dental model 100, the target digital appliance model 400 can make the teeth at the initial digital dental model 100 move by squeezing, and the pressure attachment 401 can apply force to the teeth to be corrected, so as to simulate the depressing operation of the target digital appliance model 400 on the initial digital dental model 100.

In this embodiment, step S106 specifically includes:

when the interaction between the target digital appliance model 400 and the initial digital dental model 100 is balanced, calculating the resultant moment Mx suffered by the tooth to be corrected and/or the deformation quantity Δ M of the target digital appliance model 400.

Here, "the interaction is balanced" means that when the force fluctuation at each location of the finite element model of the target digital appliance model 400 is smaller than the preset threshold and is kept for a certain period of time, the interaction is considered to be balanced, and at this time, the new layout of the teeth can be used as the orthodontic effect that the target digital appliance model 400 can achieve, that is, the layout of the teeth after the dental orthodontic appliance corresponding to the target digital appliance model 400 is fully worn.

In other words, the resultant moment Mx experienced by the tooth to be corrected and/or the deformation Δ M of the target digital appliance model 400 simulate the stress after the orthodontic appliance is fully worn, so as to represent whether the added pressure attachment 401 is qualified.

In step S106, a resultant moment Mx of the tooth to be corrected and/or a deformation Δ M of the digital appliance model 400 are calculated by a finite element analysis method.

Specifically, only one of the resultant moment Mx to which the tooth to be corrected is subjected and the deformation Δ M of the target digital appliance model 400 may be calculated, or both of the resultant moment Mx to which the tooth to be corrected is subjected and the deformation Δ M of the target digital appliance model 400 may be calculated.

Here, referring to fig. 34, when the target digital appliance model 400 is worn on the initial digital dental model 100, the pressure attachment 401 of the target digital appliance model 400 applies force to the lingual prominent area of the tooth to be corrected of the initial digital dental model 100, and the force generated by the pressure attachment 401 on the tooth to be corrected can reduce the labial resultant moment Mx on the tooth to be corrected, so as to effectively control the labial moment and prevent the anterior tooth from toppling over to the labial surface during the process of depressing the anterior tooth.

In addition, the deformation amount Δ M of the target digital appliance model 400 refers to the deformation amount Δ M of the shell-shaped appliance model 402 around the pressure attachment 401, when the pressure attachment 401 acts on the tooth to be corrected, the tooth to be corrected may react to the pressure attachment 401, thereby causing an increase in the distance between the shell-shaped appliance model 402 around the pressure attachment 401 and the tooth to be corrected, and when the distance is too large, the fit degree between the whole target digital appliance model 400 and the initial digital dental model 100 may be affected, so the deformation amount Δ M needs to be controlled to avoid directly separating from the initial digital dental model 100 because the target digital appliance model 400 deforms too much.

In a specific example, when only the resultant moment Mx is calculated, with reference to fig. 35, steps S106 and S108 specifically include:

calculating the labial resultant moment Mx of the tooth to be corrected;

judging the lip resultant moment Mx and the preset lip resultant moment Mx ₀ If the value is larger than the preset value, the pressure accessory 401 is judged to be unqualified; if not, the pressure attachment 401 is judged to be qualified.

In another specific example, when the resultant moment Mx and the deformation amount Δ M are calculated simultaneously, with reference to fig. 36, steps S106 and S108 specifically include:

calculating the labial resultant moment Mx of the teeth to be corrected and the deformation quantity delta M of the target digital corrector model;

judging the lip resultant moment Mx and the preset lip resultant moment Mx ₀ And the determined deformation quantity DeltaM and the preset deformation quantity DeltaM ₀ If at least one of the values is larger than the predetermined value, the pressure attachment 401 is judged to be unqualified; if all are not bigAccordingly, the pressure attachment 401 is judged to be qualified.

Here, only when the lip-closing moment Mx and the deformation amount Δ M satisfy the requirements at the same time, the current pressure attachment 401 is determined to be the acceptable pressure attachment 401.

In this embodiment, in order to reduce the risk of lip inclination, it is necessary to control the labial resultant moment Mx of the tooth to be corrected to be less than or equal to 0, that is, at this time, the tooth to be corrected may not tilt towards the labial direction, or the tooth to be corrected may tilt towards the lingual direction, that is, the labial resultant moment Mx is preset ₀ And is set to zero, but not limited thereto.

In addition, in order to avoid the overlarge distance between the shell-shaped appliance model 402 at the periphery of the pressure attachment 401 and the teeth to be corrected, the preset deformation quantity DeltaM is used ₀ The distance between the shell-shaped appliance model 402 and the tooth to be corrected is 1.5mm, and when the deformation quantity delta M is less than or equal to 1.5mm, the deformation quantity delta M is judged to meet the requirement, but not limited to the requirement.

With continued reference to fig. 35 and 36, if it is determined that the pressure attachment 401 is not acceptable, the process proceeds to step S110, where the design value of the pressure attachment 401 is adjusted to replace the pressure attachment 401 in the digital appliance model 400.

And then proceed to determine whether pressure attachment 401 is acceptable.

Specifically, the steps S102 to S110 may be repeated, that is, the design value of the reference pressure attachment 301 in the target digital dental model 300 is adjusted according to the design value of the adjusted pressure attachment 401, and then the target digital appliance model 400 including the pressure attachment 401 with the new design value is generated, and whether the pressure attachment 401 with the new design value is qualified is further determined until the pressure attachment 401 is qualified.

In the present embodiment, the phrase "adjusting the design value of the pressure attachment 401" specifically means adjusting the size and the installation position of the pressure attachment 401.

The dimensions include the height, cross-sectional area, etc. of the pressure attachment 401, and the placement location includes the distance of the pressure attachment 401 from the edge of the shell appliance model 402, etc.

Here, the size and the setting position are both set with limit values in consideration of the actual molding process, the stability of the actual orthodontic appliance, and the like.

If pressure attachment 401 is judged to be non-conforming and the design value for pressure attachment 401 reaches the limit value, the limit value is taken as the final design value for pressure attachment 401.

That is, if the design value of the pressure attachment 401 has been adjusted to the limit value, but the calculated lip-closing moment Mx and the deformation amount Δ M are still not satisfactory, the limit value is directly used as the final design value of the pressure attachment 401.

Next, a method of designing a pressure attachment in which the pressure attachment 401 of the present embodiment is the depressed ridge 701a of the second embodiment and the twisted ridge 701b of the third embodiment will be described.

Referring to fig. 37, when the pressure attachment 401 corresponds to the case where the depressed ridge 701a of the second embodiment includes only the first protrusion 7011a, the step of adding the reference pressure attachment 301 to the intermediate digital dental model 200 to form the target digital dental model 300 "includes:

a reference pressure attachment 301a is added to the incisal end of the tooth to be corrected of the middle digital dental model 300 to form a target digital dental model 300a.

Referring to FIG. 38, a target digital appliance model 400a including a pressure attachment 401a is then generated from the target digital dental model 300a, the pressure attachment 401a matching the reference pressure attachment 301 a.

Step S106 specifically includes:

generating an intermediate digital appliance model 600 matched with the intermediate digital dental model 200;

wearing the intermediate digital appliance model 600 on the initial digital dental model 100, and calculating an initial depression force Y1 obtained by teeth to be corrected;

calculating the current depression force Y2 obtained by the teeth to be corrected when the target digital appliance model 400a is worn on the initial digital dental model 100;

calculating a first difference value delta Y between the current depression force Y2 and the initial depression force Y1;

judging the size of the first difference value delta Y and a preset difference value, and if the size of the first difference value delta Y is larger than the preset difference value, judging that the pressure accessory 401a is qualified; if not, the pressure attachment 401a is judged to be unqualified.

Here, whether the pressure attachment 401a is qualified is judged by calculating the increase in the depression force.

Other steps can refer to the foregoing description, and are not repeated herein.

Referring to fig. 39, when the pressure attachment 401 corresponds to the case where the depressed ridge 701a of the second embodiment includes the first protrusion 7011a and the second protrusion 7012a, the aforementioned step of "adding the reference pressure attachment 301 to the intermediate digital dental model 200 to form the target digital dental model 300" is specifically:

the reference pressure attachment 301a 'is added to the incisal end and the lingual side of the tooth to be corrected of the middle digital dental model 300 to form a target digital dental model 300a'.

Referring to FIG. 40, a target digital appliance model 400a ' including a pressure attachment 401a ' is then generated from the target digital dental model 300a ', the pressure attachment 401a ' being matched to the reference pressure attachment 301a '.

Step S106 specifically includes:

the intermediate digital appliance model 600 is worn on the initial digital dental model 100, and the initial depressing force Y1' and the initial lingual combined moment Mx obtained by the teeth to be corrected are calculated ₁ ’；

Calculating the current depressing force Y2 'and the current lingual resultant moment Mx obtained by the teeth to be corrected when the target digital appliance model 400a' is worn on the initial digital dental model 100 ₂ ’；

Calculating a first difference DeltaY ' between the current depression force Y2' and the initial depression force Y1', and calculating an initial lingual resultant moment Mx ₁ ' moment Mx of resultant with current tongue direction ₂ ' and calculating a ratio of the first difference Δ Y ' and the second difference Δ Mx ';

judging the size of the ratio and a preset ratio, and if the ratio is larger than the preset ratio, judging that the pressure accessory 401a' is qualified; if not, the pressure attachment 401a' is judged to be unqualified.

Here, whether the pressure attachment 401a' is acceptable is determined by calculating the ratio of the increment of the depressing force to the decrement of the tongue resultant moment.

Specifically, the pressure attachment 401a 'can simultaneously reduce the force of the teeth to be corrected and reduce the tongue-wise fitting moment, and when the above ratio is larger, the reduction of the force of the pressure attachment 401a' and the reduction of the tongue-wise fitting moment are better.

Other steps can refer to the foregoing description, and are not described herein again.

Referring to fig. 41, when the pressure attachment 401 corresponds to the torsion ridge 701b in the third embodiment, the step of "adding the reference pressure attachment 301 to the intermediate digital dental model 200 to form the target digital dental model 300" is specifically as follows:

and adding a reference pressure attachment 301b to the labial surface and/or lingual surface area of the tooth to be corrected of the middle digital dental model 300 to form a target digital dental model 300b, wherein the reference pressure attachment 301b is positioned on one side of the long axis Z of the tooth body, and the reference pressure attachment 301b extends from the incisal end to the gingival end.

Referring to FIG. 42, a target digital appliance model 400b including a pressure attachment 401b is then generated from the target digital dental model 300b, the pressure attachment 401b being matched to the reference pressure attachment 301 b.

Step S106 specifically includes:

calculating the torsion resultant moment My of the teeth to be corrected;

judging the magnitude of the torsional resultant moment My and a preset torsional resultant moment, and if the magnitude of the torsional resultant moment My and the preset torsional resultant moment are larger than the preset torsional resultant moment, judging that the pressure accessory 401b is qualified; if not, the pressure attachment 401b is judged to be unqualified.

Here, whether the pressure attachment 401a is qualified, that is, whether the expected twist resultant moment My can be obtained by setting the pressure attachment 401a is judged by calculating the twist resultant moment My.

With reference to fig. 43, an embodiment of the present invention further provides a system 500 for designing a pressure attachment.

The design system 500 includes a memory storing a computer program operable on the processor and the processor 50, when executing the computer program, implements the steps in the method of designing a pressure attachment as described above.

Here, in conjunction with the description of the foregoing design method, the processor 50 includes the following units:

an dental model acquisition unit 51 for acquiring an initial digital dental model 100;

an appliance model acquisition unit 52 for acquiring a targeted digital appliance model 400 comprising a pressure attachment 401;

the simulation unit 53 is used for wearing the target digital appliance 400 model on the initial digital dental model 100, and the pressure attachment 401 applies force to the tooth to be corrected;

the calculation unit 54 is used for calculating at least one of resultant moment, depression force and deformation of the target digital appliance model on the teeth to be corrected;

and a judging unit 55, configured to judge whether the pressure attachment 401 is qualified according to the calculation result.

It should be noted that each unit of the processor 50 may also be configured to execute other steps in the foregoing design method, and specific reference may be made to the foregoing description, which is not described herein again.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps in the method for designing a pressure attachment as described above.

With reference to fig. 44, an embodiment of the present invention further provides a method for forming an orthodontic appliance, which includes the steps of, in combination with the description of the method for designing the pressure attachment 401:

obtaining an initial digital dental model 100;

designing an action quantity on the initial digital dental model 100 to form an intermediate digital dental model 200;

here, the amount of action designed on the initial digitized dental model 100 is a depression force.

In connection with FIG. 45, an intermediate digital appliance model 600 is generated that matches the intermediate digital dental model 200;

here, the intermediate digital appliance model 600 is a finite element model without a pressure attachment, i.e., the intermediate digital appliance model 600 contains only the compression force.

The intermediate digital appliance model 600 is worn on the initial digital dental model 100, and the intermediate digital appliance 600 applies force to the tooth to be corrected;

calculating the resultant moment Mx of the tooth to be corrected ₁ Or a depression force;

determine resultant moment Mx ₁ Or whether the depression force is within a preset range;

if so, forming the dental orthodontic appliance according to the middle digital dental model 200;

if not, adding the reference pressure attachment 301 at the middle digital dental model 200 to form a target digital appliance model 400 comprising the pressure attachment 401, judging whether the pressure attachment is qualified according to the design method of the pressure attachment, and forming the dental orthodontic appliance according to the middle digital dental model 200 added with the reference pressure attachment 301 when the pressure attachment is judged to be qualified, namely forming the dental orthodontic appliance by using the target digital dental model 300.

It can be seen that the method for forming the orthodontic appliance of the present embodiment further includes a process for determining whether the pressure attachment 401 needs to be added.

That is, the present embodiment wears the intermediate digital appliance model 600 without the pressure attachment to the initial digital dental model 100 to calculate the force applied before adding the pressure attachment 401.

If the requirements are met, the orthodontic appliance is directly molded according to the middle digital dental model 200 without adding a pressure accessory.

If the requirements are not met, adding the pressure attachment 401, judging whether the pressure attachment 401 is qualified, when the pressure attachment 401 is qualified, reflecting the design quantity of the qualified pressure attachment 401 to the reference pressure attachment 301, adjusting the reference pressure attachment 301 to generate the replaced target digital dental model 300, and forming the orthodontic appliance according to the replaced target digital dental model 300.

It can be understood that "determine resultant moment Mx ₁ Or whether the depression force is within the preset range "may refer to the judgment process in the aforementioned design method of the pressure attachment 401.

It should be noted that, in practical applications, because the depth of coverage of the patients is different, the inclination angle of each tooth to be corrected is different, and it is not necessary that all the teeth to be corrected have lip inclination or tongue inclination phenomena during the depressing process, or it is not necessary that all the teeth to be corrected need to be further depressed, so it is only necessary to add a pressure attachment for increasing or decreasing the labial closing moment when the teeth to be corrected have a labial closing moment during the depressing process, a pressure attachment for increasing or decreasing the lingual closing moment when the lingual closing moment is generated during the depressing process, or a pressure attachment for increasing the depressing force when the depressing force is insufficient during the depressing process.

In addition, the final orthodontic appliance can be formed according to the conventional process, that is, a solid curing model is formed according to the intermediate digital dental model 200 (or the target digital dental model 300 including the reference pressure attachment 301), and then the final orthodontic appliance is formed through a hot-pressing film forming process, and in other embodiments, the final orthodontic appliance can be directly formed according to the intermediate digital dental model 600 (or the target digital appliance model 400).

An embodiment of the utility model also provides a forming system of just abnormal ware of dentistry.

The shaping system comprises a memory and a processor, the memory stores a computer program operable on the processor, and the processor implements the steps in the method for shaping an orthodontic appliance as described above when executing the computer program.

Here, the orthodontic appliance molding system may be the same system as the pressure attachment design system 500 described above, and share memory and processor 50.

Referring to FIG. 46, a dental model obtaining unit 51 in the processor 50 is used for obtaining the initial digital dental model 100 and the intermediate digital dental model 200 formed by designing the action amount on the initial digital dental model 100;

the appliance model obtaining unit 52 is configured to generate an intermediate digital appliance model 600 that matches the intermediate digital dental model 200;

the simulation unit 53 is configured to wear the intermediate digital appliance model 600 on the initial digital dental model 100, and the intermediate digital appliance 600 applies force to the tooth to be corrected;

the computing unit 54 is used for computing the resultant moment Mx suffered by the teeth to be corrected ₁ ；

The determination unit 55 is used for determining the resultant moment Mx ₁ And whether the depression force is within a predetermined range.

The processor 50 may further include a processing unit 56, and the processing unit 56 is configured to mold the orthodontic appliance according to the determination result of the determining unit 55.

Specifically, if the determination result of the determination unit 55 is yes, the processing unit 56 forms the orthodontic appliance according to the middle digital dental model 200;

if the determination result of the determination unit 55 is no, the processing unit 56 adds the reference pressure attachment 301 to the intermediate digital dental model 200 to form the target digital appliance model 400 including the pressure attachment 401, the processor 50 determines whether the pressure attachment is qualified according to the design method of the pressure attachment, and when the pressure attachment is determined to be qualified, the dental appliance is molded according to the intermediate digital dental model 200 with the reference pressure attachment 301 added, that is, the dental appliance is molded by using the target digital dental model 300.

It should be noted that each unit of the processor 50 may also be configured to execute other steps in the aforementioned molding method, and reference may be made to the foregoing description specifically, and details are not described here again.

An embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the method for forming an orthodontic appliance as described above.

It will be appreciated that the computer program may simultaneously implement the steps of the method of designing a pressure attachment as described above and the steps of the method of forming an orthodontic appliance as described above.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. An orthodontic appliance with a depressed ridge is characterized by comprising an appliance body forming a cavity for accommodating a tooth and the depressed ridge integrally connected with the appliance body, wherein the depressed ridge comprises a first protrusion protruding towards the cavity and arranged corresponding to the tangential end of the tooth to be corrected.

2. The orthodontic appliance of claim 1, wherein the tooth to be corrected is at least one of an incisor, a cuspid, and a premolar.

3. The orthodontic appliance of claim 1, wherein the first projection overlies the incised end of the tooth to be corrected in a first direction, the first direction being a direction with the labial surface facing the lingual surface.

4. The orthodontic appliance of claim 1, wherein the depressed ridge further includes a second protrusion disposed corresponding to a lingual or labial surface of the tooth to be corrected.

5. The orthodontic appliance of claim 4, wherein the first and second projections are hollow structures that are recessed toward the cavity.

6. The orthodontic appliance of claim 4, wherein the first protrusion is formed from a plurality of spaced apart protrusion splices and/or the second protrusion is formed from a plurality of spaced apart protrusion splices.

7. The orthodontic appliance of claim 4, wherein the force application direction of the first protrusion is perpendicular to the incisal end of the tooth to be corrected, and the force application direction of the second protrusion is perpendicular to the lingual or labial surface of the tooth to be corrected.

8. The orthodontic appliance of claim 4, wherein the second projection is located between the incised end of the tooth to be corrected and the socket.

9. The orthodontic appliance of claim 4 wherein the second projection is disposed adjacent the first projection with a gap therebetween.

10. The orthodontic appliance of claim 4 wherein the first projection is interconnected with the second projection.

11. The orthodontic appliance of claim 4, wherein the depressed ridge has an L-shaped longitudinal cross section along a second direction toward a gingival end of the tooth to be corrected, and the longitudinal cross section passes through both the first projection and the second projection.

12. The orthodontic appliance of claim 4, wherein the depressed ridge is configured to: when the second bulge is unfolded to be flush with the first bulge, the outer contour of the pressing ridge is one of a long strip shape, a square shape, a round shape, an oval shape, a blunt angle shape, a crescent shape, a wave shape and a fold line shape.

13. The orthodontic appliance of claim 4 wherein the maximum depth of the depressed ridge ranges from 0.05mm to 0.5mm.

14. The orthodontic appliance of claim 4 wherein the area of the opening where the depressed ridge connects to the appliance body ranges from 0.5mm ² -18mm ² 。

15. The orthodontic appliance of claim 4, wherein the area of the opening where the depressed ridge connects to the appliance body is equal to the area of contact of the depressed ridge with the tooth to be corrected.

16. The orthodontic appliance of claim 4, wherein the first minimum distance between the hypotenuse and the mesial surface ranges from 0.5mm to 3mm when the hypotenuse is on the side of the long axis of the tooth body near the mesial surface, and ranges from 0.5mm to 3mm when the hypotenuse is on the side of the long axis of the tooth body near the distal surface.

17. The orthodontic appliance of claim 16, wherein the first minimum distance ranges from 1mm to 2mm and the second minimum distance ranges from 1mm to 2mm.

18. The orthodontic appliance of claim 4 wherein the third minimum distance between the bottom edge of the second projection proximate the gingival end and the gingival end is in the range of 0.5mm to 3mm.

19. The orthodontic appliance of claim 18, wherein the third minimum distance ranges from 1mm to 2mm.

20. The orthodontic appliance of claim 1, wherein the orthodontic appliance has a plurality of spaced-apart depressed ridges corresponding to one tooth to be corrected.

21. The orthodontic appliance of claim 20, wherein the appliance has two depressed ridges, one on each side of the long axis of the tooth to be corrected.

22. The orthodontic appliance of claim 1, wherein the orthodontic appliance has a plurality of depressed ridges corresponding to a plurality of teeth to be corrected.