The purpose of this study was to investigate stress distribution in bone around bone-bonded and bone-adapted titanium cylindrical implants with various countersink angles using 2-dimensional finite element analysis. In the bone-adapted model, the slip element was used at the interface between the bone and implant. The following results were obtained.
1. Stresses were observed at the compact bone around the countersink in both bone-bonded and boneadapted implants. Nevertheless, stress concentration differed in the location. In bone-bonded implants, the stress concentration was observed at the upper most part of the compact bone around the countersink of the implants. Whereas, in bone-adapted implants it was observed at the compact bone around the edge of the countersink.
2. In bone-bonded implants, various countersink angles scarcely affected the stress value in bone. But in bone-adapted implants, the 75 degrees of countersink angle reduced the stress value utmost.
