Abstract
The purpose of this study was to investigate stress distribution in bone around bone-bonded and bone-adapted titanium cylindrical implants with various thread 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 results were as follows:1. In bone-bonded titanium implants, stress concentration was observed in compact bone around the neck of the implant. Various thread angles scarcely affected stress distribution and stress value in bone around the implant.2. In bone-adapted titanium implants, stress concentration was observed widely in cancellous bone around the thread ridge and bottom of the implant and in cortical bone around the neck of the implant. The stress value in bone reduced. These facts indicated that thread design was effective on stress reduction in bone around the implant. Especially, a 30-degree thread angle reduced the stress value utmost.
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