Abstract
This study was designed to clarify the standards for functional evaluation of the anterior guidance. The rotation and translation of the mandibular head in protrusive movement were measured with a simplified condylar movement recorder using the dual axis graphic system.
At the edge-to-edge position, a significant correlation was noted between the sagittal condylarguide inclination and the incisal guide inclination, but the rotation of the mandibular head inprotrusive movement was variable because of curves of the condylar path and incisal path. Thechanging aspects of the rotation of the mandibular head could be classified into three types.Nevertheless, changes in the rotation of the mandibular head did not go beyond a certain range, suggesting that there are some limitations on the change in the rotation of the mandibular head.
From the above, it was concluded that there is something characteristic about the rotation of themandibular head from the intercuspal position to edge-to edge contact position in protrusivemovement. This suggests that it is important for us to understand the phases of rotation andtranslation of the mandibular head in the evaluation of the function of anterior guidance.
