Abstract: Objective：To evaluate the relationship of incisal point displacements in the mandibular retruded contact position (RCP) between the self-controlled retruded approach and bimanual manipulation method. Methods: Twelve healthy young volunteers were selected. The RCP was guided through the self-controlled retruded approach and bimanual manipulation method. The track of the incisal point was recorded, using the mandibular movement trace recording system. The movement direction of the incisal point in horizontal plane was observed. The distance between the incisal point of the RCP and intercuspal contact position (ICP) was measured.Results: Except one volunteer’s incisal point movement direction of the RCP was oblique, others were straight toward posterior. The displacements of the incisal point from the ICP to RCP guided through self-controlled approach and bimanual manipulation method were (1.15±0.64) mm, (0.98±0.29) mm respectively. There was no statistical significance between the two methods (P>0.05).  Conclusion: The displacements of the incisal point from the ICP to RCP guided through selfcontrolled approach and bimanual manipulation method are approximately the same.

Key words: Centric relation, Mandible, Incisal point