The invention relates to a method for designing a dental appliance for a facial skeleton including dental crowns and the roots corresponding thereto, said method including the following steps: producing a volumetric image of the facial skeleton, in the form an initial digital file, using medical imaging modifying said volumetric image by means of the computer processing of said initial digital file, and obtaining a modified digital file, said modification including at least one tooth movement with a view to implementing a desired correction of the dentition designing said dental appliance using said initial digital file and said modified digital file, and producing a file capable of being used by digitally controlled machines capable of manufacturing a dental appliance. In the step of modifying the volumetric image, for each tooth that is moved, the crown thereof is individualized and the root corresponding thereto is associated therewith, characterized in that said volumetric image of the facial skeleton includes the image of the mandibular joint and a record of the movements of the mandible over the course of a plurality of movements of said mandible, so as to account for the possible movements of said joint after capturing the movement of said mandible.
