Ichiro Masui

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.

A Case of Surgical Orthodontic Treatment of Deformed Healing with the Widening Upper Dental Arch by Trauma

In this case, widening and scissors bite of left upper dental arch was observed as a complication after fracture. Le Fort I type osteotomy of the left maxilla and palatine suture osteotomy were performed and the constriction of the upper dental arch by using a rapid maxillary contraction appliance was rendered. As compared with before the treatment, 2.0mm reduction of maxillary arch on P-A cephalogram, and 3.3mm reduction of the distance of central incisors, 3.9mm reduction of the distance of first bicuspids and 2.6mm reduction of the distance of first molars were observed in the model. Following treatment, the occlusions and aesthetic feeling were recovered satisfactorily in a short time.

A Study of Prediction of Soft Tissue Profile following Orthognathic Surgery for Mandibular Prognathism

of skeletal class M malocclusion who were given mandibular body ostectomy were used and the following study was made. 1. The subjects for this study consisted of 23 females with an average age of 18 years and 9 months. All subjects had skeletal Class M malocclusion and 11 of these had a complication of open bite. Twenty subjects were given step ostectomy of the mandibular body and the other three vertical ostectomy. Right lateral radiographic cephalometric films were taken as reference at five points in time: before, immediately after, 3 months after, 6 months after, and a year after operatlon.