インプラント破折に関する生体力学的検討  [in Japanese] A Biomechanical Study of Implant Fracture  [in Japanese]

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Author(s)

    • 保志 美砂子 HOSHI Misako
    • 九州大学大学院歯学研究院口腔機能修復学講座咀嚼機能再建学分野 Faculty of Dental Science, Section of Oral Rehabilitation, Division of Removable Prosthodontics, Kyushu University
    • 松下 恭之 MATSUSHITA Yasuyuki
    • 九州大学大学院歯学研究院口腔機能修復学講座生体機能工学分野 Faculty of Dental Science, Section of Oral Rehabilitation, Division of Reconstructive Biotechnology, Kyushu University
    • 木原 優文 KIHARA Masafumi
    • 九州大学大学院歯学研究院口腔機能修復学講座咀嚼機能再建学分野 Faculty of Dental Science, Section of Oral Rehabilitation, Division of Removable Prosthodontics, Kyushu University
    • 古谷野 潔 KOYANO Kiyoshi
    • 九州大学大学院歯学研究院口腔機能修復学講座咀嚼機能再建学分野 Faculty of Dental Science, Section of Oral Rehabilitation, Division of Removable Prosthodontics, Kyushu University

Abstract

One of the possible complications of dental implant treatment is fracture of implant components. Metal fatigue and biomechanical overload seem to be the most common causes of fractured implant components.<br/> We experienced a case of retaining screw loosening and consequent fracture of an implant. In this case, implants had been installed in the mandibular molar region, with an inferior alveolar nerve repositioning procedure. Five years after functional loading, a fracture of the distally placed implant fixture was observed.<br/> The fractured surface was observed by scanning electron microscope(SEM). The SEM analysis showed evidence of metal fatigue, which is thought to be the most common cause of implant fracture.The finite element methods(FEM)model was established based on this case, and then the stress distribution in and around the implants was investigated. The results showed that the non-fractured fixture had a higher concentration of stresses than the fractured one. Higher tensile stress concentration was observed at the abutment-superstructure interface of the non-fractured implant. Clinically,the superstructure is connected to the abutment with a retaining screw. Therefore, the retaining screw in the non-fractured implant might have loosened, resulting in a fracture of the other fixture due to the anterior cantilever condition.<br/> It is important to check for screw loosening during the maintenance period, to prevent serious damage, such as implant fracture.<br/>

Journal

  • Journal of Japanese Society of Oral Implantology

    Journal of Japanese Society of Oral Implantology 15(2), 192-198, 2002-06-30

    Japanese Society of Oral Implantology

References:  17

Cited by:  5

Codes

  • NII Article ID (NAID)
    10008957467
  • NII NACSIS-CAT ID (NCID)
    AN10072606
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09146695
  • Data Source
    CJP  CJPref  J-STAGE 
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