Hiroshi Inamoto

Long-Term Prognosis of BSSO Mandibular Relapse and its Relation to Different Facial Types

The bilateral sagittal split osteotomy (BSSO) has evolved into an effective and preferred surgical procedure for mandibular setbacks. As with all surgical procedures designed to setback the mandible, relapse occasionally occurs after BSSO procedures. Several factors have been suggested to play a contributory role in this relapse. The present study was performed to determine the stability of the mandibular position over the course of long-term observation. Different facial patterns that could potentially be used as predictors of relapse were examined. The study included cases of skeletal mandibular prognathism, with the patient in each case having undergone surgical correction involving a BSSO at least 5 years prior to the study. Lateral cephalograms were analyzed in order to classify facial patterns. Angular and linear cephalometric measurements, consisting of SN-Pogonion angle, SN-occlusal plane angle, and Pogonion depth and height, were compared at 1 year postoperatively and at the long-term follow-up. A significant correlation between facial type and relapse pattern was confirmed at the long-term assessment of prognosis.

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

The General Symptoms of Mandibular Prognathism Patients

We developed the convenient measuring device of spine curvature from a lateral aspect to evaluate general symptoms of mandibular prognathism patients who apparently need surgical correction.The device enabled convenient measurement of the spine curvature of patients from a lateral aspect without affections the patients.