Effect of inferior traction on a unilateral condyle under various conditions

Abstract

I investigated methods of creating traction on a unilateral condyle using three different biteplates, i.e., a bilateral biteplate on the molars, a unilateral biteplate on the molars, and a unilateral pivot. In addition, three different patterns of mandibular displacement were imparted, i.e., voluntary clenching, manual unilateral elevation of the mandible, and unilateral and bilateral myo-monitor pulse stimulation (myo-pulsing). Displacement of the condyle was measured with a computerized axiograph. When used for involuntary mandibular displacement, myo-pulsing with the pivot or the unilateral molar biteplate was the most effective for inferior traction for the contralateral condyle without creating pressure of the condyle against the glenoid fossa. Inferior traction of the condyle did not arise during voluntary clenching with the pivot or either of the biteplates. It appeared that voluntary clenching caused the condyle to press superior and against the glenoid fossa.