Shell-like orthodontic appliance, design method and manufacturing method for the same, orthodontic appliance set and system

A shell-like orthodontic appliance, comprising:

• a shell-like body provided with a cavity for accommodating a plurality of maxillary teeth;
• and
• a sagittal adjustment portion, disposed on a lingual side in an anterior region of the shell-like body and at least partially connected to the lingual side in the anterior region of the shell-like body;
• the sagittal adjustment portion has a geometric structure configured to stabilize a maxillomandibular occlusion relationship and reduce a deformation of the shell-like body caused by occlusion while to adjust positions of teeth in a mandibular anterior region relative to a maxilla in a forward direction to target occlusion positions in a sagittal direction when the shell-like orthodontic appliance is worn;
• the geometric structure comprises an accommodation space and a first reinforcing portion;
• the accommodation space defining a wall comprising an extending portion extending directly from the lingual portion of the shell-like body along the anterior region and a bending portion extending from the extending portion, and the first reinforcing portion is configured to at least partially offset deformation of the shell-like body caused by occlusion;
• the accommodation space is configured to at least accommodate an incisal edge of the teeth in the mandibular anterior region or a portion adjacent to the incisal edge of the teeth in the mandibular anterior region, the first reinforcing portion has opposing first and second ends, the first end of the first reinforcing portion is connected to the bending portion of the wall and extends along the anterior portion of the shell-like body, and the second end of the first reinforcing portion extends in a distal direction, the reinforcing portion extending along the anterior region and has left and right sides directly connected to left and right sides of the the shell-like body in the anterior region;
• and
• in a long axis direction of the teeth in a sagittal cross section, a region of the first reinforcing portion configured to contact the incisal edge of the teeth in the mandibular anterior region is configured to be more adjacent to an incisal edge of the maxillary teeth in an anterior region than a region of the accommodation space configured to contact the incisal edge of the teeth in the mandibular anterior region when the shell-like orthodontic appliance is worn.