Abstract: An articulator for constructing dentures, for use with a gothic arch tracing apparatus, comprising first and second members, having means for holding the members in spaced relationship, without being connected, and having means for mounting dental casts between the members, said tracing apparatus being removably mountable in said casts, in operable relationship, and means for forming a set of gothic arch traces, for controlling relative movement of the members in accordance with movement of the tracing apparatus.

Abstract: An intra oral tracing apparatus, comprising a tracing member and a scribing member, each of the members having means for removably mounting the member in a patient's mouth, and one of the members having universal adjustment means, the adjustment means being provided with locking means accessable through the patient's mouth.

Abstract: In the construction of dentures, a method for calibrating an articulator, comprising the steps of forming a set of intra oral gothic arch traces, the traces defining a three dimensional envelope of motion, and utilizing the intra oral traces to form a substantially identical second set of gothic arch traces on the articulator, whereby relative movement of the articulator may be confined to the envelope of motion.