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.
