[The present states and considerations of orthognathic surgery in Japan. Questionnaire in department of orthodontics of university dental hospital, and department of oral surgery of university medical hospital].

To investigate the present state of orthognathic surgery, questionnaires were sent to 30 departments of orthodontics of university dental hospital and 60 departments of oral surgery of university medical hospital. 1. Orthognathic surgery was carried out in 100% of the departments of orthodontics and 91.8% of the departments of oral surgery examined. 2. There was a difference in the number of patients between individual hospitals. 3. Analyses of cephalogram were used in 96% of the departments of orthodontics and 93% of the departments of oral surgery. 4. Pre- and post-surgical orthodontic treatments were carried out in all of the departments of orthodontics. 5. Orthodontic appliances (83.9%) were used in the departments of orthodontics for intermaxillary fixation, while orthodontic appliances (47.8%) and wire splints (49.2%) were used in the departments of oral surgery. 6. It is pointed out that the criterion of orthognathic surgery, treatment objectives on soft and hard tissue, selection of surgical method, adaptability of soft tissue after surgery, relapse, treatment planning of two jaw surgery, and postoperative stability remain to be solved in future.