Effect of clenching level on mandibular displacement in Kennedy Class II partially edentulous patients

Abstract

PURPOSE Forceful in the intercuspal position has the potential to cause significant mandibular displacement. Such a displacement can be expected to be exaggerated in patients without molar support. The appropriate for intercuspal position registration or evaluation in these patients has never been clarified. The aim of this study was to clarify the effect of and absence of posterior occlusal support on mandibular displacement. MATERIALS AND METHODS Thirteen women with a unilateral edentulous area posterior to the first premolar were enrolled in this study. They were asked to perform intercuspal at various occlusal force levels, and 3-D mandibular displacements were measured by an optoelectronic method. The effects of clenching force level and of molar tooth loss on the displacements of the condylar and second molar points were analyzed. RESULTS The mandible was elevated without substantial horizontal displacements during each task. The effect of on vertical mandibular displacement was significant, with a > or = 50% of maximal voluntary contraction causing significantly greater elevations (P or = 50% of maximal voluntary contraction caused consistent tipping of the mandible, with greater elevation on the edentulous side (P < .05). CONCLUSION The should not surpass 50% of maximal voluntary contraction for registration or evaluation of intercuspal position in Kennedy Class II patients.