The clarification of the mechanisms of peri-implant bone resorption caused by the mechanical stress and the proposal of proper shape of the implant body

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This study was performed to clarify the effect of stress distribution around periimplantbone on the localization of osteoclast. Histological observation revealed that osteoclasts were observed not only at the perimeter of the periimplant bone, but also between the implant body and periimplant bone. The presence of countersink and the differences of thread pitch and the thread angle greatly affected the maximum stress value at the periimplant bone. No apparent relationship was indicated between the periimplantstress distribution and osteoclast localization.