Arch form component

A method of making correlated maxillary and mandibular preformed arch wires for use in orthodontic system comprising the steps of making the maxillary arch wire in accordance with a compound elliptical form, and making the mandibular arch wire in accordance with a compound elliptical form such that when the arch wires are placed in substantially superposed relation the midline point of the mandibular arch wire is spaced slightly inside the midline point of the maxillary arch wire and the maximum arch width points of the mandibular arch wire is spaced inside the maximum arch width points of the maxillary arch wire.

A method of making correlated maxillary and mandibular preformed arch wires for use in an orthodontic system comprising the steps of making the maxillary arch wire in accordance with a compound elliptical form, plotting three foci so that connections therebetween would generate an isoceles triangle, preparing a closed loop of string of a length greater than the sum of the sides of the triangle and such as to produce a given arch width, generating and recording a maxillary arch form by using the string and the foci, and bending a resilient wire according to the arch form, and making the mandibular arch wire in accordance with a compound elliptical form including plotting three foci so that connections therebetween would generate an isoceles triangle, wherein the foci are plotted such that the height to base ratio of the triangle for the maxillary arch form is greater than the height to base ratio of the triangle for the mandibular arch form, preparing a closed loop of string of a length greater than the sum of the sides of the triangle and such as to produce a given arch width, generating and recording a mandibular arch form by using the string and the foci, and bending a resilient wire according to the mandibular arch form.