阅读说明：本技术 一种非均匀厚度的隐形矫治器及其设计方法 (Invisible appliance with non-uniform thickness and design method thereof ) 是由 张逢 刘云峰 韦虎 马钰炫 程康杰 于 2021-09-09 设计创作，主要内容包括：一种非均匀厚度的隐形矫治器,包括上颌牙套和下颌牙套；所述上颌牙套和下颌牙套之间设有调体,调体上下两侧分别形成有与上颌牙套相适配的上配合槽,和与下颌牙套相适配的下配合槽；所述上颌牙套与上配合槽紧密贴合,下颌牙套与下配合槽紧密贴合；与现有技术相比,通过对扭转力矩大的区域进行加厚,可以获得非均匀厚度的牙套,达到精确控制施力位置及大小的目的,同时将磨耗的牙齿与对应牙套内表面有一定距离,可以为磨耗的牙齿提供伸长移动的空间,使上下牙间形成吻合、协调、稳定的咬合接触关系,实现了矫正牙齿与调整咬合关系同时进行的功能。(An invisible appliance with non-uniform thickness comprises an upper jaw facing and a lower jaw facing; an adjuster is arranged between the upper jaw tooth socket and the lower jaw tooth socket Body constitution and regulation The upper and lower sides of the body are respectively provided with an upper matching groove matched with the upper jaw facing and a lower matching groove matched with the lower jaw facing; the upper jaw mouthpiece is tightly attached to the upper matching groove, and the lower jaw mouthpiece is tightly attached to the lower matching groove; compared with the prior art, the torsional force is appliedThe area with large moment is thickened, the tooth socket with non-uniform thickness can be obtained, the purpose of accurately controlling the force application position and size is achieved, meanwhile, a certain distance is reserved between the worn teeth and the inner surface of the corresponding tooth socket, a space for extending and moving can be provided for the worn teeth, an inosculating, coordinating and stable occlusal contact relation is formed between the upper teeth and the lower teeth, and the function of simultaneously straightening the teeth and adjusting the occlusal relation is realized.)

1. An invisible appliance with non-uniform thickness comprises an upper jaw facing (1) and a lower jaw facing (2); it is characterized in that an adjuster is arranged between the upper jaw facing (1) and the lower jaw facing (2)Body (3), regulationThe upper and lower sides of the body (3) are respectively provided with an upper matching groove (3-4) matched with the upper jaw dental mouthpiece (1) and a lower matching groove (3-5) matched with the lower jaw dental mouthpiece (2); the upper jaw facing (1) is closely attached to the upper matching groove (3-4)And the lower jaw tooth socket (2) is tightly attached to the lower matching groove (3-5).

2. The non-uniform thickness invisible appliance of claim 1, wherein the adjustment is madeThe middle part of the body (3) is provided with a toneFlour (3-1), and seasoningThe face (3-1) is positioned between the upper mating groove (3-4) and the lower mating groove (3-5).

3. The non-uniform thickness invisible appliance of claim 1, wherein the adjustment is madeThe body (3) is in a strip-shaped structure and is adjustedThe body (3) comprises an inner wall (3-2) and an outer wall (3-3), and the upper matching groove (3-4) and the lower matching groove (3-5) are positioned between the inner wall (3-2) and the outer wall (3-3).

4. The non-uniform thickness invisible appliance of claim 1, wherein the adjustment is madeThe body (3) is arranged on two sides of the upper jaw facing (1) and the lower jaw facing (2).

5. The non-uniform thickness invisible appliance of claim 1, wherein the upper and lower molar braces (1, 2) are shell-extracted structures, and the shell-extracted thickness is 0.6 to 0.8 mm.

6. A design method of an invisible appliance with non-uniform thickness is characterized by comprising the following steps:

a, directly scanning by an intraoral scanner to obtain oral data of a patient, and carrying out CT scanning on a special case to obtain jaw and tooth root data of the patient;

and B: determining parameters of the oral three-dimensional model: b, inputting the oral cavity data of the patient obtained in the step A into orthodontic treatment tooth arrangement software, and then determining restoring force provided by the appliance according to the mechanical property of the appliance material; determining the treatment period of the single pair of orthodontic devices according to the tooth movement amount and the restoring force of the orthodontic devices, thereby obtaining a dentition model for orthodontic treatment in stages; or determining the moving amount of the teeth by referring to the bone condition in the CT reconstruction model of the patient;

and C: the overall design of the appliance for correcting the full dentition deformity comprises the steps of extracting the outer surface of an obtained staged dentition model, drawing a shell from the peripheral outline of the dentition model according to a preset thickness value, thickening the area needing large torsional moment to obtain a base body model of the extended appliance, calculating the size and the direction of the required correcting force and moment according to different moving directions and moving amounts of each tooth, determining the shape and the size of a structure or an accessory of the required appliance according to the mechanical properties of materials of the appliance, and combining a local structure with the base model to obtain a primary overall model (4) of the appliance;

step D: the local structure design of the appliance for correcting the worn part is to stop according to the degree of the dentition wearThe size of the gap, andthe shape of the curve determines the vertical height to which the subgaginal 1/3 should recover and the needReconstructed dentition. Making a record of the maxillomandibular relationship and translating the relation toOn the frame, the forward extending and lateral naked guide inclination are adjusted to simulate the lower jaw movement, so thatPut on variousExercise, examinationIndirect contact relationship to determine tooth toneThe location and extent of (a) and (b),curve andthe position where the flat plane should be restored;

step E: introducing a series of tonesThe body (3) is placed in the keyIn the gap between the upper jaw tooth socket (1) and the lower jaw tooth socket (2) after the last time, the upper jaw tooth socket (1) and the lower jaw tooth socket (2) are adjustedThe body (3) is completely attached, and then the mixture is mixedThe body (3) and the upper jaw tooth socket (1) and the lower jaw tooth socket (2) do Boolean operation to adjustThe body (3) has no overlapping part with the upper jaw mouthpiece (1) and the lower jaw mouthpiece (2), the shape of the result of Boolean operation is optimized and then is combined with the lower jaw mouthpiece (2), and finally the obtained result is smoothed;

step F: outwards offsetting the inner surface of the lower jaw dental mouthpiece (2) under the data of Boolean operation, increasing the distance between the lower molar and the inner surface of the lower jaw dental mouthpiece (2), and obtaining the inner surface of the appliance between the occlusal surfaces of the upper and lower teeth; manufacturing a staged dentition model, and obtaining an accurate integral model (5) of the appliance by the method;

step G: and D, inputting the data obtained in the step F into 3D printing software, controlling the 3D printing software to output a corresponding processing program, and directly printing the appliance by using a high-resolution material through a 3D printer.

7. The method of claim 6, wherein the specific case in step A is a patient with serious dentition deformity.

8. The method of claim 6, wherein the appliance is polyethylene terephthalate (PET), and the parameters of the three-dimensional model of the oral cavity in step B include whether bicuspid tooth extraction, tooth movement or rotation, and anchorage design.

9. The method of claim 6, wherein the shell thickness of the dentition model in step C ranges from 0.6 to 0.8 mm.

10. The method of claim 6, wherein the step E adjustment is performed by a computerThe body (3) is positioned at two sides of the upper jaw facing (1) and the lower jaw facing (2) and is adjustedThe upper and lower sides of the body (3) are respectively provided with an upper matching groove (3-4) matched with the upper jaw dental mouthpiece (1) and a lower matching groove (3-5) matched with the lower jaw dental mouthpiece (2).

Technical Field

The invention relates to the field of medical technology and instruments, in particular to an invisible appliance with non-uniform thickness and a design method thereof.

Background

Tooth abrasion is a common disease in stomatology and refers to the gap between occlusal surfaces caused by the progressive loss of hard dental tissue due to mechanical abrasion. With age, the occlusal and adjacent surfaces of teeth are inevitably subjected to loss of physiological hard tissues by chewing action. Tooth abrasion is a common dental lesion of the old, and can cause tooth allergy, pulp injury, vertical distance reduction, temporomandibular joint lesion and the like, so that the recovery of normal physiological functions and the orthopedic restoration of jaw reconstruction are very necessary.

Occlusal surface evaluations were performed using the tooth wear index TWI scale proposed by Smith and Kmight: level 0: no abrasion is caused; stage I: a small amount of enamel is worn on the face and the cut end; and II, stage: enamel is abraded to dentin exposure, ranging <1/3 surface area, incisors have just exposed dentin; grade III: the surface dentin exposure is greater than 1/3 surface area, the incisal dentin is heavily worn, and the pulp is not exposed; IV stage: the pulp has been exposed or secondary dentin has been exposed.

For patients with 0, I and II level abrasion and reasonable occlusion height without occlusion reconstruction and restoration, orthodontic treatment can be adopted to improve dentition and beautify the face, so as to achieve the optimal shape and functional effect of teeth, jaws and faces, and belong to comprehensive orthodontic correction. The orthodontic appliance with the bracket is commonly used at the moment, the time of the orthodontic appliance in the mouth is too long, the oral hygiene burden is increased, and the orthodontic treatment course of a patient is sensitive due to the influence of social activities.

For grade III and IV abrasions, the pad can be made to the patient. In the past, doctors made silver pads to wear patients when eating, so that the wear of teeth can be reduced, the symptoms of the patients can be relieved, and the silver pads can be removed after the symptoms are relieved. However, it was found in the survey that most patients did not adhere to wearing the pad, mainly due to the fragility of the silver face and the discomfort of self-feeling. The patient with excessive tooth wear can also be used for false tooth repair treatment, a permanent restoration is manufactured according to the final vertical distance of the transitional denture pad, and the porcelain crown is manufactured and tried for wearing for two weeks before permanent cementation is carried out. However, some patients have limited mouth opening in clinic, accurate impressions of the whole dentition and the bone defect area are difficult to obtain by adopting the conventional impression taking technology, the manufactured removable partial denture support has relatively unsatisfactory fit with the oral cavity structure, the retention is poor, and the chewing function of the patient is influenced.

The invisible bracket-free orthodontic appliance is a movable corrective device made of transparent elastic materials and designed and manufactured by computer assistance, has the advantages of attractive appearance, comfort, sanitation and the like, is convenient for patients to use, is easy to remove, greatly reduces the time for seeing a doctor, and is deeply loved by the patients. The invisible orthodontic appliance covers the jaw face of the tooth so as to play a role of protecting and shielding, and can reduce the tooth abrasion caused by the habit of grinding teeth at night.

However, the existing invisible appliance has the following disadvantages: the thickness of the appliance made of the invisible orthodontic diaphragm with uniform thickness at the middle incisor is thinner than the thickness of the other places, so that the application of force at the middle incisor is smaller, and along with the lapse of correction time, the deviation between the actual movement amount at the middle incisor and the designed target movement value is larger and larger, so that the correction efficiency and the wearing experience of the braces are seriously influenced, and therefore, the application of force of the appliance made of the invisible orthodontic diaphragm with uniform thickness at the middle incisor is insufficient to become one of pain points in the industry; the invisible appliance cannot provide tooth axial force and is attached to teeth, so that the worn teeth cannot be extended, the problem of tooth wear cannot be solved only by the invisible appliance, and after the invisible appliance is taken down, a matched, coordinated and stable occlusion contact relation cannot be formed between the upper teeth and the lower teeth; at present, orthodontics and jaw adjustment are carried out separately on patients with dentition deformity and abrasion, and an orthodontic invisible appliance with orthodontics and jaw adjustment functions is not found.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the invisible appliance with the non-uniform thickness and the design method thereof, wherein the invisible appliance is used for accurately controlling the force application position, is high in manufacturing precision and is simple and convenient in production process flow.

In order to achieve the purpose, the invention adopts the following technical scheme: an invisible appliance with non-uniform thickness comprises an upper jaw facing and a lower jaw facing; an adjuster is arranged between the upper jaw tooth socket and the lower jaw tooth socketBody constitution and regulationThe upper and lower sides of the body are respectively provided with an upper matching groove matched with the upper jaw facing and a lower matching groove matched with the lower jaw facing; the upper jaw facing is tightly attached to the upper matching groove, and the lower jaw facing is tightly attached to the lower matching groove.

As a preferred embodiment of the present invention, the blending is performed byThe middle part of the body is provided with a toneFlour and seasoningThe face is located between the upper and lower mating grooves.

As a preferred embodiment of the present invention, the blending is performed byThe body is in a strip structure and is adjustedThe body includes inner wall and outer wall, goes up the cooperation groove and is located between inner wall and the outer wall with lower cooperation groove.

As a preferred embodiment of the present invention, the blending is performed byThe body is arranged on two sides of the upper jaw facing and the lower jaw facing.

As a preferable scheme of the invention, the upper jaw facing and the lower jaw facing are of shell-drawing structures, and the shell-drawing thickness is 0.6-0.8 mm.

A design method of an invisible appliance with non-uniform thickness comprises the following steps:

step A: directly scanning by an intraoral scanner to obtain oral data of a patient, and carrying out CT scanning on a special case to obtain jaw bone and tooth root data of the patient;

and B: determining parameters of the oral three-dimensional model: b, inputting the oral cavity data of the patient obtained in the step A into orthodontic treatment tooth arrangement software, and then determining restoring force provided by the appliance according to the mechanical property of the appliance material; determining the treatment period of the single pair of orthodontic devices according to the tooth movement amount and the restoring force of the orthodontic devices, thereby obtaining a dentition model for orthodontic treatment in stages; or determining the moving amount of the teeth by referring to the bone condition in the CT reconstruction model of the patient;

and C: the overall design of the appliance for correcting the full dentition deformity comprises the steps of extracting the outer surface of an obtained staged dentition model, drawing a shell from the peripheral outline of the dentition model according to a preset thickness value, wherein the range of the shell drawing thickness value is 0.6-0.8 mm, thickening a region needing large torsion moment, obtaining a base body model of the extended appliance, calculating the size and the direction of required correcting force and moment according to different moving directions and moving amounts of each tooth, determining the shape and the size of a structure or an accessory of the required appliance according to the mechanical properties of correcting equipment materials, and combining a local structure with a basic model to obtain a primary overall model of the appliance;

step D: the local structure design of the appliance for correcting the worn part is to stop according to the degree of the dentition wearThe size of the gap, andthe shape of the curve determines the vertical height to which the subgaginal 1/3 should recover and the needReconstructed dentition. Making a record of the maxillomandibular relationship and translating the relation toOn the frame, the forward extending and lateral naked guide inclination are adjusted to simulate the lower jaw movement, so thatPut on variousExercise, examinationIndirect contact relationship to determine tooth toneThe location and extent of (a) and (b),curve andthe position where the plane should be restored;

step E: introducing a series of tonesIs placed in the bodyIn the gap between the upper jaw tooth socket and the lower jaw tooth socket, the upper jaw tooth socket and the lower jaw tooth socket are adjustedThe body is completely attached, and then the mixture is mixedPerforming Boolean operation on the body, the upper jaw facing and the lower jaw facing to adjustThe body, the upper jaw tooth socket and the lower jaw tooth socket have no overlapped part, the shape of the result of Boolean operation is optimized and then is combined with the lower jaw tooth socket, and finally the obtained result is processed smoothly;

step F: shifting the inner surface of the lower jaw facing outwards under the data of Boolean operation, increasing the distance between the lower molars and the inner surface of the lower jaw facing, and obtaining the inner surface of the appliance between the occlusal surfaces of the upper and lower teeth; manufacturing a staged dentition model, and obtaining an accurate integral model of the appliance by the method;

step G: and D, inputting the data obtained in the step F into 3D printing software, controlling the 3D printing software to output a corresponding processing program, and directly printing the appliance by using a high-resolution material through a 3D printer.

As a preferred embodiment of the present invention, the specific case in step A is a patient with serious malformation of dentition.

As a preferred embodiment of the present invention, the appliance is polyethylene terephthalate (PET), and the parameters of the three-dimensional model of the oral cavity in step B include whether bicuspid tooth extraction is required, tooth movement or rotation, and anchorage design.

In a preferred embodiment of the present invention, the thickness of the extracted shell of the dentition model in step C ranges from 0.6 to 0.8 mm.

As a preferred embodiment of the present invention, the adjustment of step EThe body is positioned at two sides of the upper jaw facing and the lower jaw facing and is adjustedThe upper and lower sides of the body are respectively provided with an upper matching groove matched with the upper jaw facing and a lower matching groove matched with the lower jaw facing.

Compared with the prior art, the invention has the beneficial effects that:

1. the tooth socket with non-uniform thickness can be obtained by thickening the area with large torsional moment, so as to achieve the purpose of accurately controlling the force application position and size.

2. The size and the direction of the required correcting force and moment are calculated according to the different moving direction and the moving amount of each tooth, so that the problem that all teeth cannot be contacted simultaneously when being occluded due to tooth abrasion can be solved by wearing the tooth socket.

3. The worn teeth are spaced from the inner surfaces of the corresponding tooth sockets by a certain distance, so that a space for extending and moving the worn teeth can be provided, the upper teeth and the lower teeth form a consistent, coordinated and stable occlusal contact relationship, and the function of correcting the teeth and adjusting the occlusal relationship can be simultaneously performed.

4. The invisible orthodontic appliance is directly manufactured by the additive manufacturing technology, so that the production process flow is reduced, the manpower and material resources are greatly saved, the manufacturing precision is improved, and natural resources are saved.

Drawings

FIG. 1 is a schematic representation of a patient's jaw;

FIG. 2 is a top view of a preliminary global model;

FIG. 3 is a side view of a preliminary global model;

FIG. 4 is a keyA schematic view of the installation of the body;

FIG. 5 is a keyA top view of the body;

FIG. 6 is a keyA side view of the body;

FIG. 7 is a top view of the precision global model;

FIG. 8 is a side view of a precision solid model;

FIG. 9 is a schematic view of the inner surface of the precision lower shell;

FIG. 10 is a schematic outer surface view of a precision lower shell;

reference numerals: maxillary toothCover 1, mandibular facing 2, adjustmentBody 3, regulationThe tooth socket comprises a face 3-1, an inner wall 3-2, an outer wall 3-3, an upper matching groove 3-4, a lower matching groove 3-5, a primary integral model 4, an accurate integral model 5 and an accurate lower tooth socket 6.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1 to 10, a non-uniform thickness invisible appliance includes a maxillary mouthpiece 1 and a mandibular mouthpiece 2; an adjuster is arranged between the upper jaw tooth socket 1 and the lower jaw tooth socket 2Body 3, regulationThe upper and lower sides of the body 3 are respectively provided with an upper matching groove 3-4 matched with the upper jaw facing 1 and a lower matching groove 3-5 matched with the lower jaw facing 2; the upper jaw facing 1 is tightly attached to the upper matching groove 3-4, and the lower jaw facing 2 is tightly attached to the lower matching groove 3-5.

At least two adjusters are arranged between the upper jaw tooth socket 1 and the lower jaw tooth socket 2The body 3, the upper jaw facing 1 is embedded in the adjusterThe upper part of the body 3 and the lower jaw facing 2 are embedded in the adjusterLower part of body 3, regulationThe body 3 is arranged by wrapping the upper jaw facing 1 and the lower jaw facing 2, thereby realizing the pairingPositioning of the upper and lower braces 1 and 2.

Regulating deviceThe middle part of the body 3 is provided with a tone3-1 part of flourAnd 3-1 is positioned between the upper matching groove 3-4 and the lower matching groove 3-5, and is adjustedSetting and adjusting the surface 3-1 according to actual needsThe thickness of the face 3-1 is the gap between the upper and lower braces 1 and 2, thereby correcting the gap between the upper and lower jaws.

Regulating deviceThe body 3 is in a strip structure and is adjustedThe body 3 comprises an inner wall 3-2 and an outer wall 3-3, an upper matching groove 3-4 and a lower matching groove 3-5 are positioned between the inner wall 3-2 and the outer wall 3-3, and the adjustment is carried outThe body 3 is arranged along the length direction of the upper jaw facing 1 and the lower jaw facing 2 and is adjustedThe body 3 is arranged at two sides of the upper jaw mouthpiece 1 and the lower jaw mouthpiece 2, the upper jaw mouthpiece 1 and the lower jaw mouthpiece 2 are of shell-drawing structures, and the shell-drawing thickness is 0.6-0.8 mm.

A design method of an invisible appliance with non-uniform thickness comprises the following steps:

step A: the oral cavity data of a patient are directly obtained by scanning through an intraoral scanner, and CT scanning is carried out on special cases to obtain jaw bone and tooth root data of the patient, such as a patient with serious dentition deformity.

And B: determining parameters of the oral three-dimensional model: inputting the oral cavity data of the patient obtained in the step A into orthodontic treatment tooth arrangement software, wherein the orthodontic treatment tooth arrangement software comprises media, SmartV2, autolign and the like, and then determining restoring force provided by the appliance according to the mechanical property of the appliance material; determining the treatment period of the single pair of orthodontic devices according to the tooth movement amount and the restoring force of the orthodontic devices, thereby obtaining a dentition model for orthodontic treatment in stages; the special case determines the movement amount of the teeth by referring to the bone condition in the CT reconstruction model of the patient, wherein the parameters of the oral cavity three-dimensional model comprise whether bicuspids are to be extracted, tooth movement or rotation and anchorage design.

And C: the overall design of the appliance for correcting the full dentition deformity is realized, the outer surface of the obtained staged dentition model is extracted, shells are drawn out to the peripheral outline of the dentition model according to the preset thickness value, the range of the thickness value of the shells is 0.6-0.8 mm, the areas needing large torque are thickened, the base body model of the extended appliance is obtained, meanwhile, the size and the direction of the needed correcting force and moment are calculated according to the different moving direction and moving amount of each tooth, the shape and the size of the needed structure or the needed accessory of the appliance are determined according to the mechanical property of the correcting device material, and the initial overall model 4 of the appliance is obtained after the local structure and the basic model are combined.

The preliminary overall model 4 obtained at this time includes a preliminary maxillary mouthpiece and a preliminary mandibular mouthpiece.

Step D: the local structure design of the appliance for correcting the worn part is to stop according to the degree of the dentition wearThe size of the gap, andthe shape of the curve determines the vertical height to which the subgaginal 1/3 should recover and the needReconstructed dentition. Making a record of the maxillomandibular relationship and translating the relation toOn the frame, the forward extending and lateral naked guide inclination are adjusted to simulate the lower jaw movement, so thatPut on variousExercise, examinationIndirect contact relationship to determine tooth toneThe location and extent of (a) and (b),curve andthe position where the plane should be restored.

Step E: introducing a series of tonesThe body 3 is placed in the keyIn the gap between the upper dental mouthpiece 1 and the lower dental mouthpiece 2, the upper dental mouthpiece 1 and the lower dental mouthpiece 2 are adjustedThe body 3 is completely attached and then the mixture is mixedBody 3 and upper teethPerforming Boolean operation on the sleeve 1 and the lower jaw dental sleeve 2 to adjustThe body 3 has no overlapping part with the upper jaw dental mouthpiece 1 and the lower jaw dental mouthpiece 2, the shape of the result of Boolean operation is optimized and then is combined with the lower jaw dental mouthpiece 2, and finally the obtained result is smoothed.

Regulating deviceThe body 3 is positioned at two sides of the upper jaw facing 1 and the lower jaw facing 2 and is adjustedUpper and lower sides of the body 3 are respectively provided with an upper matching groove 3-4 matched with the upper jaw facing 1 and a lower matching groove 3-5 matched with the lower jaw facing 2, and the upper and lower matching grooves are adjustedThe upper jaw mouthpiece 1 and the lower jaw mouthpiece 2 can be leveled under the action of the body 3, so that the upper jaw mouthpiece 1 and the lower jaw mouthpiece 2 can be further optimized.

Step F: the inner surface of the lower jaw facing 2 is shifted outwards under the data of Boolean operation, the distance between the lower molar and the inner surface of the lower jaw facing 2 is increased, so that a certain distance is reserved between the worn teeth and the inner surface of the corresponding facing, a space for the worn teeth to move in an extending way can be provided, a matched, coordinated and stable occlusion contact relation is formed between the upper teeth and the lower teeth, the function of correcting the teeth and adjusting the occlusion relation can be simultaneously carried out, and the inner surface of the appliance between the occlusal surfaces of the upper teeth and the lower teeth is obtained through geomagic software; and manufacturing a staged dentition model, and obtaining an accurate integral model 5 of the appliance by the method.

The resulting accurate overall model 5 now includes an accurate upper jaw shell and an accurate lower jaw shell.

Step G: and D, inputting the data obtained in the step F into 3D printing software, controlling the 3D printing software to output a corresponding processing program, directly printing the appliance by using a high-resolution material through the 3D printer, and enabling the appliance to be a polyethylene terephthalate (PET) so that the appliance is of a transparent structure.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the reference numerals in the figures are used more here: upper jaw facing 1, lower jaw facing 2, tiaoBody 3, regulationThe terms of the face 3-1, the inner wall 3-2, the outer wall 3-3, the upper fitting groove 3-4, the lower fitting groove 3-5, the preliminary integral model 4, the precise integral model 5, the precise lower shell 6, etc., but do not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.