Orthodontic systems and methods

An orthodontic system comprising:

• a first removable segmentary left shell for being fitted on a left segment of teeth in a posterior left lateral sector of a maxillary arch in a first position of the left segment of teeth in a first treatment, the left segment of teeth comprising adjacent teeth and extending from a left canine to a left or molar and including left premolars;
• a first removable segmentary right shell for being fitted on a right segment of teeth in a posterior right lateral sector of the maxillary arch in a first position of the right segment of teeth in the first treatment, the right segment of teeth comprising adjacent teeth and extending from a right canine to a right molar and including right premolars;
• a second removable segmentary left shell for being fitted on the left segment of teeth in a second position in the first treatment;
• a second removable segmentary right shell for being fitted on the right segment of teeth in a second position in the first treatment;
• a right anchor configured to be fitted on a tooth on a right side of a mandible;
• a left anchor configured to be fitted on a tooth on a left side of the mandible;
• a plurality of resilient traction elements;
• and
• a plurality of complete shells, wherein the complete shells are shaped to be fitted on the teeth of the maxillary arch in consecutive positions of a second treatment;
• wherein
• the first and second removable segmentary left and right shells each comprise a labial retention feature configured to be coupled with the respective resilient traction elements and wherein the first removable left segmentary shell and the first removable right segmentary shell are not connected to each other, and wherein the second removable left segmentary shell and the second removable right segmentary shell are not connected to each other;
• and
• wherein the first and second removable right segmentary shells are configured to apply only distal forces to the right canine and right premolars and to apply rotational forces to the right molar responsive to extension of one of the resilient traction elements is extended between the right anchor and the labial retention feature on the first or second removable right segmentary shell respectively, without transferring the forces to other teeth outside the right segment in the maxillary arch, wherein
• the first and second removable left segmentary shells are configured to apply only distal forces to the left canine and left premolars and to apply rotational forces to the left molar responsive to extension of one of the resilient traction elements between the left anchor and the labial retention feature on the first or second removable left segmentary shell respectively, without transferring the forces to other teeth outside the left segment in the maxillary arch, and wherein
• the first treatment is a treatment for treating a class II malocclusion to arrive at a class I malocclusion, and wherein the second treatment is a treatment for resolving the class I malocclusion.