Orthodontic appliance including arch member

A method of specifying an orthodontic appliance comprising:

• providing a proposed specification of the orthodontic appliance, wherein the orthodontic appliance comprises an arch member comprising an arch member body and an arch member coupling integral with the body, and a set of anchors, each anchor comprising an anchor coupling and a base adapted to connect the anchor to a surface of a tooth, wherein each arch member coupling is releasably connectable to the anchor coupling, and wherein the arch member body comprises a cross-sectional geometry that varies along a length of the body;
• providing a first digital image representing a first dental arrangement associated with the orthodontic appliance;
• deriving a target digital image representing a target dental arrangement;
• revising the proposed specification of the orthodontic appliance based in part on the target digital image;
• and
• forming the orthodontic appliance based on the revised proposed specification, wherein forming the orthodontic appliance comprises forming the arch member body and an arch member coupling integral with the arch member body by removing a portion of a sheet of material to form the arch member body and the arch member coupling.