Clinical features of centric relation involve which hinge description?

• A. An untranslated, purely rotational hinge position about the transverse horizontal axis
• B. The dynamic relationship of the mandibular anterior teeth
• C. The complete intercuspation of the opposing teeth
• D. Stable stops on all teeth

Answer: (A)

Centric relation is defined by the mandible positioning the condyles in the most superior–anterior position within the glenoid fossa, with movement that is a pure hinge around a transverse horizontal axis and no translation of the condyles. That is why describing it as an untranslated, purely rotational hinge position about the transverse horizontal axis best fits CR. The other ideas pertain to tooth contacts or dynamic guidance rather than the jaw’s hinge position: anterior tooth guidance describes how teeth guide movement, not the initial condylar position; complete intercuspation refers to tooth contact at occlusion rather than the condylar relationship; and stable stops on all teeth talk about occlusal contacts, not the hinge description of the jaw.