Abstract: In one aspect of the present application, a shell-shaped tooth repositioner is provided, it comprises: N successive shell-shaped tooth repositioners corresponding to N successive steps, respectively, where each of the N shell-shaped tooth repositioners is for repositioning teeth from an initial tooth arrangement of a corresponding step to a target tooth arrangement of the corresponding step, where a first bite plate is provided on a lingual side of a portion corresponding to a first tooth of each of the N shell-shaped tooth repositioners, for opening bite of anterior teeth, where relative positions between the first bite plates on the N shell-shaped tooth repositioners and the first tooth are such that each of the N shell-shaped tooth repositioners is able to open bite of the anterior teeth to an extent that is substantially consistent with a target extent, where N is a natural number greater than 3.

Abstract: Disclosed is an attachment and a shell-shaped tooth repositioner assembly for repositioning a dentition from a first tooth arrangement to a second tooth arrangement, the assembly comprises a first attachment and a shell-shaped tooth repositioner, wherein the first attachment is a raised element fixed on a first tooth and forms a first force-applying surface to be applied a force thereon by the shell-shaped tooth repositioner and transferring the force to the first tooth, wherein the facing direction of the first force-applying surface is determined based on a movement tendency relative to the first tooth of a part of the shell-shaped tooth repositioner covering the first tooth, the shell-shaped tooth repositioner is an integral shell which forms a cavity receiving the dentition and a first attachment-receiving cavity receiving the first attachment, the first attachment-receiving cavity engages the first attachment when the shell-shaped tooth repositioner is worn on the dentition.

Abstract: The present application provides a body of a dental appliance, the body is a one-piece shell which forms a cavity for receiving a plurality of teeth and a first mounting surface for mounting a first accessory by bonding the first mounting surface and a second mounting surface of the first accessory, where the first mounting surface has artificially designed geometry and edge contour, which substantially match that of the second mounting surface.

Abstract: One aspect of the present application provides a method for generating 3D digital model of teeth, the method comprises: scanning a patient's teeth with a first feeler gauge inserted in a first gap between two adjacent teeth, to obtain a first 3D digital model; extracting a position and a direction of the first feeler gauge from the first 3D digital model; and modifying the first gap of an original 3D digital model of teeth based on the specification, position and direction of the first feeler gauge, to obtain a refined 3D digital model of teeth.

Abstract: Provided is an accessory for being fixed on tooth and enabling a shell-shaped tooth repositioner to apply forces to the tooth, wherein the accessory is a 3D body enclosed by a bottom surface, a guiding surface and N successively-adjoined force-applying surfaces, the accessory can be fixed on the tooth by bonding the bottom surface and a surface of the tooth, the bottom surface and the guiding surface adjoin each of the N successively adjoined force applying surface, transition between the guidance surface and the surface of the tooth is gentler than transition between each of the N force-applying surfaces and the surface of the tooth, N is a natural number greater than or equal to 2, among the N successively-adjoined force-applying surfaces, an angle between a first force-applying surface and the Nth force applying surface is greater than or equal to 60° and less than or equal to 120°.

Abstract: In one aspect, the present application provides a method of fabricating a shell-shaped repositioner for repositioning teeth from a first tooth arrangement to a second tooth arrangement, comprising: obtaining a first 3D digital model representing the first tooth arrangement, a second 3D digital model representing the second tooth arrangement and information of restrictions on anchorage force bearing of a first tooth among the teeth; modifying the second 3D digital model based on the first 3D digital model, the second 3D digital model and the information of restrictions on anchorage force bearing of the first tooth, to obtain a third 3D digital model; and controlling an apparatus using the third 3D digital model to fabricate the shell-shaped repositioner.

Abstract: In one aspect of the present application, a shell-shaped dental appliance is provided, which is an integral shell and forms a cavity for receiving teeth and a cavity for receiving an attachment adhesively fixed on a tooth, the cavity for receiving teeth and the cavity for receiving the attachment are continuous, wherein a part of a surface of the cavity for receiving the attachment, which part is close to the root of the tooth, protrudes towards the cusp of the tooth, to snap-fit into an indentation towards the cusp of the tooth formed on a part of a surface of the attachment, which part is close to the root of the tooth.

Abstract: The present application discloses a method for numerically simulating orthodontic effect of an orthodontic appliance.

Abstract: In one aspect of the present application, a dental appliance for isolating jaws from facial muscles is provided, the dental appliance is substantially in the shape of an elongated plate curved according to dental arches, and is received between the jaws and the facial muscles when it is worn, the dental appliance comprises: buccal shields located at both ends of the dental appliance and configured to isolate posterior teeth from facial muscles; and labial bumpers located in the middle of the dental appliance and configured to isolate anterior teeth from facial muscles, wherein the buccal shields and the labial bumpers form an integral piece.

Abstract: The present application provides a shell-shaped body of a shell-shaped dental appliance, the shell-shaped body is a one-piece shell and forms a cavity for receiving a plurality of teeth and a first accessory mounting area, where the contour of the outer surface of the first accessory mounting area has a standard geometry for mounting a first accessory having a standard mounting surface, where the contour of the outer surface of the first accessory mounting area substantially matches that of the standard mounting surface of the first accessory.

Abstract: In one aspect, the present application provides a method of fabricating a shell-shaped repositioner for repositioning teeth from a first tooth arrangement to a second tooth arrangement, comprising: obtaining a first 3D digital model representing the first tooth arrangement, a second 3D digital model representing the second tooth arrangement and information of restrictions on anchorage force bearing of a first tooth among the teeth; modifying the second 3D digital model based on the first 3D digital model, the second 3D digital model and the information of restrictions on anchorage force bearing of the first tooth, to obtain a third 3D digital model; and controlling an apparatus using the third 3D digital model to fabricate the shell-shaped repositioner.

Abstract: The present application discloses a method for numerically simulating orthodontic effect of an orthodontic appliance.