The cervical facebow and mandibular rotation.

The purpose of this longitudinal investigation was to determine whether the cervical facebow treatment affected mandibular rotation. Pretreatment and posttreatment tracings were compared using four different methods of superimposition in the headgear group and the control group. Mandibular rotation was measured in parameters of direction and intensity. Statistical evaluations of the data were made to determine significant differences between headgear and control groups. The following conclusions can be made: (1) There is a significant difference among the four methods of cephalometric superimposition. (2) The sella-nasion and registration point methods showed a significant difference in mandibular growth direction and intensity between the headgear and the control cases while the intersection and C.C. methods did not.