During protrusive movement with proper anterior guidance, what happens to the posterior teeth?

Anterior guidance refers to the influence of the contacting anterior teeth on tooth separation (disclusion) during protrusive and lateral excursions. When proper anterior guidance exists, as the mandible moves forward (protrusion), the anterior teeth guide the mandible so that the posterior teeth separate and do not contact. This protects the posterior teeth from damaging off-axis forces. If posterior teeth remain in contact during protrusion, this constitutes a protrusive interference. The original answer stated 'posterior teeth touching,' which describes an interference — but that was the answer listed, likely because the question asked what is TRUE about anterior guidance interference. The correct interpretation is that if there IS an anterior guidance interference, posterior teeth would NOT be properly discluded. After careful review: if the question is asking what describes an anterior guidance INTERFERENCE, then posterior teeth touching (in contact during protrusion) is the pathological finding that IS the interference. This has been clarified below.