破折した中空インプラントの走査電子顕微鏡と光学顕微鏡による観察 [in Japanese] Scanning Electron and Light Microscopic Observation of a Fractured Hollow Implant [in Japanese]
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The purpose of this study was to investigate radiologic, histologic, and ultrastructural findings of a retrieved hollow Bonefit-HC implant that survived for 2 years in the maxilla of a 54-year-old male. A periapical radiograph showed a moderate radiolucency at the cervix. The ultrastructural analysis of the fractured surface disclosed that metal fatigue fracture occurred. Examination of the histological sections disclosed that the remaining hollow portion was completely filled with healthy bone tissue and that the shape of extruding bone tissue was fitted to the ceiling of the other fractured implant. Consequently, the fracture had occurred before implant removal, and the reasons for this fracture were thought to be 1) overloading due to few abutments, 2) excess stress concentration of bending moment to this implant because of lateral guided occlusion and anterior guidance, 3) angulated installation, and 4) its specific open cage-like design.
- Nihon Hotetsu Shika Gakkai Zasshi
Nihon Hotetsu Shika Gakkai Zasshi 41(2), 195-200, 1997-04-01
Japan Prosthodontic Society