Functioning survival rate of the fixture and superstructure of osseointegrated implants (first report)

Osseointegrated implant bridges (OIB) have shown excellent progressing in the majority of cases. Since 1983, OIBs has been used to treat about 110 cases in Tokyo Dental College Hospital with more than 500 fixtures. The survival rate of OIB, especially the functioning survival rate of these fixtures, is described, herein. The survival rate of the superstructure of OIB has been almost 100% in both maxilla and mandible. However, the functioning survival rate of OIB fixtures was 88% in maxillary cases and 96% in mandibular cases at less than 1 year. Very few fixtures had to be removed after more than 1 year in either maxilla or the mandible. It appears that the functioning survival rate of OIB fixture is generally decided during the period just between connecting these components and 1 year. A few fixtures may need to be removed later.