An attachment and shell appliance combination and method of making same

Abstract

The application provides a combined device of an accessory and a shell-shaped appliance and a manufacturing method thereof, the accessory comprises a tooth accessory fixed on a tooth surface and a dental model accessory fixed on a dental model, the tooth accessory is smaller than the dental model accessory, the occlusal surface of the dental model accessory forms different degrees of occlusal contact with the opposite teeth, so that the shell-shaped appliance generated based on the dental model with the dental model accessory fixed thereon can enhance the seating by using the occlusal force, there is a gap between the occlusal surface of the dental model accessory and the introduction surface of the tooth accessory, so that there is a gap between the accessory cavity of the shell-shaped appliance and the tooth accessory, the appliance has a larger surface area and better elastic performance in the accessory part, which is beneficial to enhance the seating and express the correction force, in addition, the occlusal surface of the dental model accessory can also be designed to have the functions of lifting the occlusion and leading the lower jaw.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of orthodontics, and in particular relates to a combination device of an attachment and a shell-shaped appliance and a manufacturing method thereof. BACKGROUND

[0002] The bracket-free invisible orthodontic technology is based on the tooth arrangement design of digital dental model to produce a series of shell-shaped appliances. When the patient wears the appliance, the appliance is elastically deformed to be in place, and at the same time, the orthodontic force is applied to the teeth to move the teeth until the deformation is restored. By sequentially wearing the shell-shaped appliance, the teeth are moved along the designed path, and finally a good tooth arrangement and occlusion are obtained.

[0003] In order to obtain good orthodontic effect, it is not enough to simply rely on the shell-shaped appliance, and some attachments are often needed to assist the retention and mechanical expression of the shell-shaped appliance. However, it is found in clinical practice that the appliance often has insufficient retention at the position of the attachment, which is manifested as the non-fitting between the attachment cavity of the shell-shaped appliance and the attachment, and the tooth also shows the phenomenon of de-tracking, and cannot reach the designed target position and angle. The inventors of the present application found that the non-fitting between the attachment and the appliance is essentially the mismatch between the design of the attachment, the mechanical properties of the appliance, and the design of the tooth movement scheme.

[0004] In order to improve the efficiency of the shell-shaped appliance in moving the teeth, the design of the attachment can be optimized (for example, see the following patent documents 1 and 2) to enhance the retention, retention or functional surface force of the shell-shaped appliance.

[0005] PRIOR ART

[0006] Patent document 1: CN212879636U

[0007] Patent document 2: CN113425428A SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] According to the technologies disclosed in patent documents 1 and 2, the retention, retention or force of the shell-shaped appliance is enhanced by optimizing the shape of the attachment to design a special introduction surface (or guide surface), retention surface and force surface, thereby assisting the tooth movement. However, for difficult tooth movement, such as the orthoaxis of molar, the torsion of premolar, the forward movement of posterior teeth, the root control of anterior teeth, etc., the requirement for the attachment-shell-shaped appliance force system expression is higher. In order to cope with these requirements, there is still room for improvement in the design of the combination device of the attachment-shell-shaped appliance.

[0010] To solve the above problems, the application further optimizes the design of the combined device of the attachment and the shell-shaped appliance, on the one hand, so as to leave a gap between the occlusal surface and the guide surface of the attachment of the shell-shaped appliance, increase the area of the local appliance as much as possible, and thus increase the elastic performance of the local appliance, so as to facilitate the positioning, retention and force application of the appliance at the position of the attachment, on the other hand, the shape of the occlusal surface at the attachment cavity of the appliance is designed based on the interarch occlusal contact, so as to utilize the occlusal force to enhance the positioning and retention of the appliance, in addition, unlike the fixed position, shape and volume of the existing attachment, the design of the position, shape and volume of the attachment of the application also refers more to the anatomical information and the mechanical requirements of the tooth movement scheme, furthermore, the occlusal surface of the dental model attachment can also be designed to have the functions of occlusal elevation and mandibular guidance, and assist orthodontic treatment.

[0011] An aspect of the application provides a combined device of an attachment and a shell-shaped appliance, comprising an attachment, a dental model and a shell-shaped appliance,

[0012] The attachment comprises a tooth attachment and a dental model attachment, characterized in that the tooth attachment is a three-dimensional body fixed on a tooth and formed by a bottom surface, a force application surface, a guide surface and a non-functional surface, the dental model attachment is a three-dimensional body closed by a bottom surface, a force application surface, an occlusal surface and a non-functional surface, the tooth attachment is formed based on the dental model attachment and is smaller than the dental model attachment;

[0013] The dental model is a tooth model for fixing the dental model attachment or the tooth attachment;

[0014] The shell-shaped appliance is a cavity covering the surface of the dental model with the dental model attachment fixed thereon and accommodating the attachment and the tooth, characterized in that, in clinical application, when the shell-shaped appliance is worn on the tooth, the cavity accommodating the attachment is larger than the tooth attachment and has occlusal contact with the opposite shell-shaped appliance.

[0015] In some embodiments, the shape and boundary of the occlusal surface of the dental model attachment conform to the shape of the opposite tooth, so that the shell-shaped appliance covering the occlusal surface of the dental model attachment has different degrees of occlusal contact with the shell-shaped appliance covering the surface of the opposite tooth, so as to utilize the occlusal force to assist the positioning of the shell-shaped appliance around the tooth attachment, and the occlusal surface can also be designed as a higher platform or slope to achieve the functions of occlusal elevation and mandibular guidance.

[0016] In some embodiments, the bottom surface of the dental model attachment is a fixed surface, the shape of which conforms to the anatomical shape of the dental crown, and the mesial-distal length and the gingival width can be up to the length and width of the dental crown.

[0017] In some embodiments, the position and angle of the dental attachment on the tooth are determined by the direction of tooth movement, and the force on the force application surface of the dental attachment and the moment are consistent with the required force system. The area of the force application surface is determined based on the anchorage control requirements.

[0018] In some embodiments, the force application surface and the bottom surface of the dental attachment are consistent with the plane of the dental model attachment, and the area of the force application surface and the bottom surface of the dental attachment are smaller than or equal to the area of the force application surface and the bottom surface of the dental model attachment, respectively. The lead-in surface of the dental attachment is a plane, a circular arc surface or a concave arc surface inclined to the gingival side formed by removing part of the occlusal surface and the edge of the dental model attachment.

[0019] In some embodiments, the non-functional surface of the dental attachment and the dental model attachment can exist or not exist.

[0020] Another aspect of the present application provides a method for manufacturing a combination device of an attachment and a shell-shaped appliance, the combination device comprising an attachment, a dental model and a shell-shaped appliance, the method comprising the steps of,

[0021] obtaining a digitized dental model;

[0022] Further, a digitized dental model attachment is installed on the digitized dental model, the dental model attachment being a three-dimensional body enclosed by a bottom surface, a force application surface, an occlusal surface and a non-functional surface;

[0023] Further, a digitized dental attachment is generated based on the digitized dental model attachment, the dental attachment being a three-dimensional body enclosed by a bottom surface, a force application surface, a lead-in surface and a non-functional surface, the dental attachment being smaller than the dental model attachment;

[0024] Further, a shell-shaped appliance is generated based on the digitized dental model with the digitized dental model attachment installed thereon, the shell-shaped appliance being a cavity accommodating the dental model and the dental model attachment and being fitted therewith;

[0025] Further, an attachment template is generated based on the digitized dental model with the digitized dental attachment installed thereon, the attachment template being a cavity accommodating the dental model and the dental attachment and being fitted therewith, the physical dental attachment being generated in clinic by using the attachment template, the dental attachment being bonded to the tooth surface by the bottom surface;

[0026] or generating an attachment template from the dental model with the dental model attachment installed thereon, generating a physical dental model attachment in clinic, and then generating a dental attachment by the dentist grinding the dental model attachment;

[0027] Further, the shell-shaped appliance is worn, the shell-shaped appliance containing the dental attachment and the tooth, the force application surface of the shell-shaped appliance's attachment cavity abutting the force application surface of the dental attachment, and at least a gap existing between the occlusal surface of the shell-shaped appliance and the lead-in surface of the dental attachment.

[0028] In some embodiments, the occlusal surface of the dental model attachment is shaped and bounded to the shape of the opposing tooth and to produce different degrees of occlusal collision with the opposing tooth, and the bottom surface is shaped to conform to the anatomical shape of the tooth crown, and the mesial-distal length and the gingival width are maximally up to the length and width of the tooth crown.

[0029] In some embodiments, the position, size and angle of the force application surface of the dental attachment are determined based on the direction of tooth movement, so that the force system is consistent with the required force system, and the volume of the dental model attachment is determined based on the anchorage relationship and anchorage requirements.

[0030] In some embodiments, the force application surface of the dental attachment is consistent with the force application surface of the dental model attachment, the bottom surface of the dental attachment is less than or equal to the bottom surface of the dental model attachment, the lead-in surface of the dental attachment is a beveled gingival plane, a circular arc surface or a concave arc surface formed by removing part of the occlusal surface and the edge of the dental model attachment, and the non-functional surface of the dental attachment can or can not exist.

[0031] In some embodiments, the method of generating a shell-shaped appliance or an attachment template from a digitized dental model can be directly generated by a 3D printing method, or a dental model can be first 3D printed, and then a film is pressed to generate a shell-shaped appliance or an attachment template.

[0032] Compared with the prior art, the beneficial effects of the present application include: on the basis of the existing attachment optimization, by increasing the area of the non-force application surface of the appliance attachment cavity, the elastic properties of the local appliance of the attachment are increased, and the vertical occlusal force on the occlusal surface of the attachment cavity is used to further improve the expression of the mechanical system required by the attachment local appliance, the retention and the force application surface. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 (a) and (b) are schematic diagrams of the combination of the attachment and the shell-shaped appliance in one embodiment of the present application.

[0034] Figure 2 is a three-dimensional view of the attachment in one embodiment of the present application.

[0035] Figure 3 (a) and (b) are front view and side view of the attachment in one embodiment of the present application.

[0036] Figure 4(a) and (b) are front and side views of an attachment in yet another embodiment of the present application.

[0037] Figure 5 (a) and (b) are front and side views of an attachment in yet another embodiment of the present application.

[0038] Figure 6 (a) and (b) are front and side views of an attachment in yet another embodiment of the present application.

[0039] Figure 7 (a) and (b) are front and side views of an attachment in yet another embodiment of the present application.

[0040] Figure 8 is a schematic diagram of a method of making a combination of an attachment and a shell aligner in an embodiment of the present application.

[0041] Reference 100: attachment; reference 200: dental model; reference 300: shell aligner; reference 301: attachment cavity; reference 101: tooth attachment; reference 102: model attachment; reference 1011: bottom surface of tooth attachment; reference 1012: force application surface of tooth attachment; reference 1013: lead-in surface of tooth attachment; reference 1021: bottom surface of model attachment; reference 1022: force application surface of model attachment; reference 1023: occlusal surface of model attachment; reference 1024: non-functional surface of model attachment. DETAILED DESCRIPTION

[0042] Figure 1 (a) and (b) and Figure 2 A combination of an attachment and a shell aligner in an embodiment of the present application is schematically shown, comprising an attachment 100, a dental model 200 and a shell aligner 300.

[0043] The attachment 100 comprises a tooth attachment 101 and a model attachment 102.

[0044] The shell aligner 300 is a cavity that fits over the surface of the dental model 200 with the model attachment 102 fixed thereon and accommodates the attachment and the tooth, characterized in that the attachment cavity 301 that accommodates the attachment when the shell aligner is worn on the tooth in clinical practice is larger than the tooth attachment 101 and makes occlusal contact with the counter shell aligner.

[0045] The tooth attachment 101 is a three-dimensional body for being fixed on the tooth and enclosed by a bottom surface 1011, a force application surface 1012 and a lead-in surface 1013, in which the force application surface is a contiguous gingival force application surface and mesial force application surface in the illustration, and in some embodiments, a non-functional surface can also exist.

[0046] The dental model accessory 102 is a three-dimensional body for fixing on the dental model, and is enclosed by the bottom surface 1021, the force application surface 1022, the occlusal surface 1023 and the non-functional surface 1024. In the illustration, the force application surface is the adjacent gingival force application surface and the mesial force application surface. In some embodiments, the non-functional surface can also be absent.

[0047] The dental accessory 101 is generated based on the dental model accessory 102, and is smaller than the dental model accessory. The force application surface and the bottom surface of the dental accessory are consistent with the planes of the force application surface and the bottom surface of the dental model accessory, but the areas are smaller than or equal to the latter. The occlusal surface and the edge removal part of the dental model accessory form the introduction surface of the dental accessory, and are a plane, a circular arc surface or a concave arc surface inclined gingivally. There is a gap between the occlusal surface of the dental model accessory and the introduction surface of the dental accessory, thereby increasing the elasticity of the partial shell aligner.

[0048] Figure 3 (a) and (b) schematically show the front view and side view of the dental accessory and the dental model accessory.

[0049] The shape and boundary of the occlusal surface 1023 of the dental model accessory are consistent with the shape of the opposite tooth, so that the shell aligner covering the occlusal surface of the dental model accessory and the shell aligner covering the opposite tooth surface produce different degrees of occlusal contact, thereby assisting the shell aligner to be in place and wrapped around the dental accessory by using the occlusal force.

[0050] The dental accessory is smaller than the dental model accessory, and has no occlusal contact with the opposite tooth.

[0051] The bottom surface 1021 of the dental model accessory is a fixed surface, and its shape is consistent with the anatomical shape of the dental crown. The mesial-distal length and the gingival width can be up to the length and width of the dental crown. The larger the dental model accessory, the larger the accessory cavity surface area of the corresponding shell aligner, and the greater the elasticity of the partial aligner, which is beneficial to the placement of the aligner and the expression of the force.

[0052] The position and angle of the dental accessory fixed on the tooth are determined according to the direction of tooth movement in such a way that the force and torque on the force application surface 1012 of the dental accessory are consistent with the required force system. The area of the force application surface is determined based on the control requirements of the anchorage.

[0053] Figure 4 (a) and (b) are the front view and side view of another example of the dental accessory and the dental model accessory.

[0054] The occlusal surface 1023 of the dental model accessory and the occlusal contact of the opposite tooth are single-point contact, and can also be two-point contact, three-point contact or multi-point contact, which can assist the shell aligner to be in place and fit by using the occlusal force to different degrees; the occlusal surface 1023 of the dental model accessory is larger than the introduction surface 1013 of the dental accessory.

[0055] Figure 5(a) and (b) are front and side views of another example of a dental attachment and a dental model attachment.

[0056] The occlusal surface 1023 of the dental model attachment can also be designed to be higher than the occlusal contact surface of the opposing jaw, and the shell aligner made based on the dental model attachment not only has the effect of assisting the alignment by using the occlusal force, but also has the effect of raising the occlusal surface, which is suitable for the case of raising the occlusal surface to prevent occlusal interference in clinical treatment of reverse or lock.

[0057] Figure 6 (a) and (b) are front and side views of another example of a dental attachment and a dental model attachment.

[0058] The occlusal surface 1023 of the dental model attachment can also be designed to be higher than the occlusal contact surface of the opposing jaw, and the shell aligner made based on the dental model attachment not only has the effect of assisting the alignment by using the occlusal force, but also has the effect of raising the occlusal surface, which is suitable for the case of raising the occlusal surface to prevent occlusal interference in clinical treatment of reverse or lock.

[0059] Figure 7 (a) and (b) are front and side views of another example of a dental attachment and a dental model attachment.

[0060] The occlusal surface 1023 of the dental model attachment can also be designed to be higher than the occlusal contact surface of the opposing jaw, and the shell aligner made based on the dental model attachment not only has the effect of assisting the alignment by using the occlusal force, but also has the effect of raising the occlusal surface, which is suitable for the case of raising the occlusal surface to prevent occlusal interference in clinical treatment of reverse or lock.

[0061] The application also provides a method for manufacturing an attachment and a shell aligner, Figure 8 An embodiment of the manufacturing method is shown, which comprises the following steps:

[0062] Step S101, obtaining a digital dental model;

[0063] Step S102, installing a digital dental model attachment on the digital dental model, wherein the dental model attachment is a three-dimensional body enclosed by a bottom surface, a force application surface, an occlusal surface, and a non-functional surface, the shape and boundary of the occlusal surface of the dental model attachment are consistent with the shape of the opposing tooth, and the occlusal surface of the dental model attachment produces different degrees of occlusal collision with the opposing tooth, the shape of the bottom surface is consistent with the anatomical shape of the dental crown, the maximum mesial-distal length and the maximum gingival width of the bottom surface can reach the length and width of the dental crown, the position, size, and angle of the force application surface are determined based on the tooth movement direction, so that the force system is consistent with the required force system, and the volume of the dental model attachment is determined based on the anchorage relationship and anchorage requirements;

[0064] Step S103, generating a digital tooth attachment on the basis of the digital dental model attachment, the tooth attachment being a three-dimensional body enclosed by a bottom surface, a force application surface, a guide surface and a non-functional surface, the tooth attachment being smaller than the dental model attachment, the force application surface and the bottom surface of the tooth attachment being consistent with the plane where the force application surface and the bottom surface of the dental model attachment are located, but the areas of the force application surface and the bottom surface of the tooth attachment being smaller than or equal to the force application surface and the bottom surface of the dental model attachment respectively, the guide surface of the tooth attachment being a plane, a circular arc surface or a concave arc surface slanting towards the gingival side formed by removing part of the occlusal surface and the edge of the dental model attachment, the non-functional surface of the tooth attachment being present or absent, the tooth attachment having no occlusal contact with the opposite jaw;

[0065] Step S104, generating a shell-shaped aligner on the basis of the digital dental model with the digital dental model attachment installed, the shell-shaped aligner being a cavity accommodating the dental model and the dental model attachment and being fitted therewith;

[0066] Step S105, generating an attachment template on the basis of the digital dental model with the digital tooth attachment installed, the attachment template being a cavity accommodating the dental model and the tooth attachment and being fitted therewith;

[0067] Step S106, generating a physical tooth attachment in clinic by using the attachment template, the tooth attachment being bonded to the tooth surface through the bottom surface;

[0068] In some embodiments, the physical tooth attachment can also be generated in another way:

[0069] Step S203, generating an attachment template from the dental model with the dental model attachment installed;

[0070] Step S204, generating a physical dental model attachment in clinic by using the attachment template;

[0071] Step S205, generating a tooth attachment by a dentist grinding the dental model attachment, the occlusal surface and the edge removal part of the dental model attachment generating the guide surface of the physical tooth attachment;

[0072] Step S107, wearing the shell-shaped aligner, the shell-shaped aligner accommodating and being larger than the tooth attachment and the tooth, the force application surface of the attachment cavity of the shell-shaped aligner abutting against the force application surface of the tooth attachment, and there being a certain gap at least in the occlusal surface and the guide surface of the tooth attachment, the occlusal surface of the shell-shaped aligner having a certain occlusal collision with the opposite jaw, and the tooth attachment having no occlusal collision with the opposite jaw.

[0073] In some embodiments, the method of generating the shell-shaped aligner or the attachment template from the digital dental model can be directly generated by a 3D printing method, or the dental model can be first 3D printed, and then a film is pressed to generate the shell-shaped aligner or the attachment template.

[0074] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

Claims

1. An attachment and shell appliance combination, comprising: The combination device comprises an attachment, a dental cast and a shell aligner, the attachment comprises a tooth attachment and a cast attachment, the tooth attachment is a three-dimensional body fixed on a tooth and enclosed by a bottom surface, a force application surface, a guide surface and a non-functional surface, the cast attachment is a three-dimensional body fixed on a cast and enclosed by a bottom surface, a force application surface, an occlusal surface and a non-functional surface, wherein the tooth attachment is formed based on the cast attachment and is smaller than the cast attachment; The cast is a tooth cast for fixing the cast attachment or the tooth attachment; The shell aligner is a cavity for accommodating the attachment and the tooth, which is fitted on the surface of the cast with the cast attachment fixed thereon, wherein the cavity for accommodating the attachment is larger than the tooth attachment when the shell aligner is worn on the tooth in clinic, and the shell aligner produces occlusal contact with the counter shell aligner, The force application surface and the bottom surface of the tooth attachment are consistent with the planes where the force application surface and the bottom surface of the cast attachment are located, but the areas of the force application surface and the bottom surface of the tooth attachment are smaller than those of the force application surface and the bottom surface of the cast attachment, and the guide surface of the tooth attachment is a plane, a circular arc surface or a concave arc surface inclined to the gingival side formed by removing part of the occlusal surface and the edge of the cast attachment.

2. The combination of an attachment and a shell aligner of claim 1, wherein, The shape and boundary of the occlusal surface of the cast attachment are consistent with the shape of the counter tooth, so that the shell aligner covering the occlusal surface of the cast attachment produces different degrees of occlusal contact with the shell aligner covering the counter tooth surface, so as to assist the shell aligner in wrapping the tooth attachment by using the occlusal force, and the occlusal surface can also be designed as a higher platform or slope to achieve the function of lifting the occlusion or leading the mandible.

3. The combination of an attachment and a shell aligner of claim 1 or 2, wherein, The bottom surface of the cast attachment is a fixed surface, and the shape thereof is consistent with the anatomical shape of the crown, and the mesial-distal length and the gingival width are respectively up to the length and the width of the crown.

4. The combination of an attachment and a shell aligner of claim 1 or 2, wherein, The position and angle of the tooth attachment fixed on the tooth are determined by the tooth movement direction in a manner that the force and the moment on the force application surface of the tooth attachment are consistent with the required force system, and the area of the force application surface is determined based on the anchorage control requirement.

5. The combination of an attachment and a shell aligner of claim 1 or 2, wherein, The non-functional surfaces of the tooth attachment and the cast attachment exist or not.

6. A manufacturing method of the combination device of any one of claims 1-5, the combination device comprising an attachment, a dental cast and a shell aligner, the manufacturing method comprising the following steps, (1) obtaining a digital cast; (2) installing a digital cast attachment on the digital cast, the cast attachment being a three-dimensional body enclosed by a bottom surface, a force application surface, an occlusal surface and a non-functional surface; (3) Generating a digital tooth attachment on the basis of a digital dental model attachment, the tooth attachment being a three-dimensional body enclosed by a bottom surface, a force application surface, a guide surface and a non-functional surface, the tooth attachment being smaller than the dental model attachment, the force application surface and the bottom surface of the tooth attachment being consistent with the plane of the force application surface and the bottom surface of the dental model attachment, the area of the force application surface and the bottom surface of the tooth attachment being smaller than the area of the force application surface and the bottom surface of the dental model attachment, the guide surface of the tooth attachment being a plane, a circular arc surface or a concave arc surface inclined to the gingival side formed by removing part of the occlusal surface and the edge of the dental model attachment, the non-functional surface of the tooth attachment being present or absent in relation to the non-functional surface of the dental model attachment, the position, size and angle of the force application surface of the tooth attachment being determined in a manner consistent with the desired force system based on the direction of tooth movement, the volume of the tooth attachment being determined based on the relationship and requirements of the anchorage; (4) Generating a shell-shaped appliance on the basis of a digital dental model with the digital dental model attachment installed, the shell-shaped appliance being a cavity accommodating the dental model and the dental model attachment and being in close contact therewith; (5) Generating an attachment template on the basis of a digital dental model with the digital tooth attachment installed, the attachment template being a cavity accommodating the dental model and the tooth attachment and being in close contact therewith, the tooth attachment being generated in the clinic using the attachment template, the tooth attachment being bonded to the tooth surface through the bottom surface; or generating an attachment template from a dental model with a dental model attachment installed, generating a physical dental model attachment in the clinic, and then generating a tooth attachment by a dentist grinding the dental model attachment; (6) Wearing the shell-shaped appliance, the shell-shaped appliance accommodating the tooth attachment and the tooth, the force application surface of the attachment cavity of the shell-shaped appliance being in abutment with the force application surface of the tooth attachment, and there being a certain gap at least on the occlusal surface with the guide surface of the tooth attachment, the occlusal surface of the shell-shaped appliance producing a certain occlusal impact with the opposite jaw.

7. The method of fabricating a combination of an attachment and a shell aligner according to claim 6, wherein, The shape and boundary of the occlusal surface of the dental model attachment conform to the shape of the opposite jaw tooth, and produce different degrees of occlusal impact with the opposite jaw in a manner of assisting the appliance in place with occlusal force, the occlusal surface can be designed as a high platform or a slope to achieve the function of lifting the occlusion or leading the mandible, the shape of the bottom surface conforms to the anatomical shape of the crown, and the mesial-distal length and the gingival width can be up to the length and width of the crown respectively.

8. The method of fabricating a combination of an attachment and a shell aligner according to claim 6 or 7, wherein, The method of generating a shell-shaped appliance or an attachment template from a digital dental model is directly generated by 3D printing, or a dental model is first 3D printed, and then a film is pressed to generate a shell-shaped appliance or an attachment template.

Images