Investigation into Pre and Post Operative Functional Changes of Jaw Movement and Oral Cavity Related Muscles of Maxillofacial Deformaties.

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We developed a total measuring system for dento-facial deformities using computer graphics (CG), ultrasonic echogram and electromyogram to evaluate morphological change of the hard and soft tissue after orthognathic surgery, and to clarify functional change of the temporo-mandibular joint (TMJ), tongue and masticatory muscle.1.Development of a three dimensional measuring and display system for maxillofacial region : In addition to the three dimensional reconstruction and display system for CT images already developed by ourselves, we developed an automatic three dimensional measuring, evaluating and display system for facial plaster models 5,6,16,19). This system realizes the automatic and accurate three dimensional measuring, and can display the result with CGs. It has the "Best Fit" function which detects even slight morphological change of the face, and can measure and display morphological changes after surgey or with growth at every part of the face quantitively.2.Development of a … More evaluating method of the functional jaw movement : We developed a system which can get the electromyogram and ultrasonic echogram of the masticatory muscles synchronously at the jaw movement7,17). This kind of system and analysis is very unique, and will be a useful method for the investigation into the functional morphological changes of the muscles.3.Clinical research and improvement of the operation method : We performed various orthognathic surgery for maxillofacial deformities, and observed the morphological and functional changes after surgery 1,8,9,12,13,15,20). Then, we clarified as following ; the condyle of the mandibular protrusion takes slight anterior position in the mandibular fossa 18), the supra- and infrahyoid muscles take part in the relapse after mandibular ramus sagittal split osteotomy 3,4), and the position of the tongue has great influence on the skeletal stability 1,12). And we developed proximal segment positioning system for mandibular ramus sagittal split osteotomy which cause less relapse referring to above data 2). We also developed an artificial TMJ and performed the total replacement of TMJ for the patients who were suffering from masticatory and respiratory disturbance due to TMJ destruction 10,11,14). In addition, we pointed out the characteristics of the facial deformities in the cleft lip and palate patients quantitively using above three dimensional measuring system and showed usefulness of the system 5,16,19). Less