Toshitaka Uji

Two-step repositioning of the maxilla in bimaxillary orthognathic surgery

A two-step repositioning system in bimaxillary osteotomies, a combination of a modified face-bow transfer and the use of an occlusal plane indicator is described. With this system, the risks involved in depending solely on reproduction of the model-constructed position can be avoided.

Epidemiologic Survey of the Patients with Dento-facial Deformity. Questionnarie Study.

Epidemiologic study was conducted bygiving a questionnaire to 414 patients (128 males, 286 females) who indicated surgical correction of dentofacial deformity to investigate etiologic factors. The same questionnaire was given to 482 dental students as the control group and statistically compared with the patient group. The results were as follows:1. The suggestive items of hereditary factors were recognized in the patient group, and many parents, brothers, and sisters of patients tended to have dento-facial deformity and familial congenital anomaly.2. Many patients tended to have suffered from abnormality in their mothers body during fetal stage and birth.3. Many patients tended to have any abnomality of skull morphology during childhood.4. There was no significance of facial traumatic anamnesis between patient and control groups.5. Patients who had many dental caries, oral habits, food preference, underwent orthodontic treatment or operation of jaw during childhood, and anamnesis of temporomandibular joint luxation were significantly more than those in the control group.The results of this study revealed that dento-facial deformity was caused by hereditary and environmental factors