[Clinical retrospective study on outpatients at clinic for oral implant]

A retrospective study was made on 1,000 outpatients visiting the Clinic for Oral Implant, University Hospital, Faculty of Dentistry, Tokyo Medical and Dental University between April 1995 and June 1998. The following findings were obtained according to sex, age group, reason for visit, classification of edentulous area, indication and contraindication for implant therapy, and pre-implant surgical treatment. Forty percent of the outpatients were male and 60% were female. The largest number was in the 50-59-year-old group. The reason for visit of 822 patients was request for implant therapy. 123 patients with uncomfortable implants done at other clinics, 12 patients undergoing maintenance of implants at other clinics and 43 other patients. There were 505 upper jaw cases and 529 lower jaw cases. Most anterior edentulous cases were in the upper jaw group. Most of the posterior edentulous cases were unilateral cases and many of them were free-end saddle cases. Indication patients were 447 of the 822 outpatients. The main contraindication was insufficient volume of bone. Two hundred twenty-one of the 477 indication patients did not need the pretreatment which consisted of extraction, bone graft, free gingival graft, provisional prosthetics, sinus lift, and so on.