Abstract: Apparatus for repositioning teeth from an initial tooth arrangement to a final tooth arrangement, comprising a series of individual appliances comprising an introductory appliance that conforms to the initial tooth position, and remaining appliances of the series designed to incrementally reposition the teeth from an initial tooth arrangement, through a plurality of intermediate tooth arrangements (if there are any), and to a final tooth arrangement.

Abstract: A method and impression tools for making a dental impression, with the method including first applying a spacer material to a preliminary impression material to form a preliminary impression tool, and then contacting the tool against the dental surface to form a preliminary dental impression in the preliminary impression material. The method further includes separating the tool from the dental surface, and then removing the spacer material from the tool to reveal the preliminary dental impression. The method then includes applying a final impression material to the preliminary impression to form a final impression tool, which is then contacted against the dental surface to form a final impression of the tooth surface in the final impression material.