2002 Volume 15 Issue 4 Pages 467-474
The osseointegrated implant™ was introduced more than 30 years ago by Prof. Brånemark. Since then, its application in dental implant therapy has made much progress. And many implants of this type have had the longest observation time and have proven efficacy for dental rehabilitation of totally and partially edentulous patients.
We performed a clinical study on the POI® 2-piece implant, which was developed by our group and Kyocera Co. in 1991, and placed from 1991 to 1999 in our clinic.
The results were as follows:
1. The total number of patients was 165:72 males and 93 females, whose ages widely ranged from 19 to 79 years.
2. The total number of POI®2-piece implants was 425.
3. The classification of implantation part:The number of implants placed in maxillae was 114;the number placed in mandibles was 311.
Especially, the number of implants used in mandibles was three times as many as that used in maxillae.
4. The classification of treatment stages:The number of implants that received post-prosthetic treatment was 381, and that in healing stage was 22. The other 22 implants were considered failures:18 implants failed in osseointegration before prosthetic treatment, and 4 implants lost their osseointegration after prosthetic treatment.
5. The classification of prosthetic types:The number of implants of screw- or cement-fixing type was 362;19 were removable type.
6. The survival rate of POI® 2-piece implants was 94.8% (22 failures out of 425). The part of middle piece was 95.8%, free end was 97.9%, and completely edentulous jaw was 65.2%.
The POI® 2-piece implant was proved satisfactory in our clinical results of this study.
