インプラントの上部構造体高径とフィクスチャーの長さの比がインプラント周囲骨のひずみに及ぼす影響  [in Japanese] Effects of the Ratio of Superstructure Length to Fixture Length on the Strain of the Bone Surfaces Surrounding the Implant  [in Japanese]

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Author(s)

    • 吉野 晃 YOSHINO Akira
    • 明海大学歯学部口腔外科学第1講座 First Department of Oral and Maxillofacial Surgery, Meikai University School of Dentistry

Abstract

Numerous studies have indicated that the osseointegrated implant is appreciated as a highly reliable method to recover occlusal capability in the prosthetic treatment of missing teeth. However, such osseointegration may be broken if an excess of occlusal force is applied. Clinically, incongruity between superstructure length and fixture length is considered a pivotal factor that may cause osseointegration breakage. But no studies have looked at the effects of the ratio of superstructure length to fixture length (superstructure-fixture ratio) on perimaxillary distortion under an actual load. Therefore, to clarify this issue, fixtures were embedded in a human air-dried mandible. The experiments were carried out under static loading, and the distribution of strains on the bone surfaces surrounding the implant was measured.<br/> 1. When a composite of superstructure and fixture was placed at its central loading point, it was found that the strain of the bony tissue surrounding the fixture was only slightly affected by the superstructure-fixture ratio.<br/> 2. When the loading point was shifted eccentrically to the buccolingual side, it was found that the superstructure length was increased, resulting in an increase in the strain located at the cortical portion surrounding the junction of fixture and abutment.<br/> 3. Similarly, with eccentric loading, regarding the strain of the cortical portion surrounding the junction of fixture and abutment, it was found that a superstructure-fixture ratio of 1:1 was near the verge of osseointegration breakage.<br/> 4. Finally, it was found that equality of height of the superstructure and fixture length gave rise to an even distribution of occlusal force on the jaw bone, and resulted in no adverse effects.<br/>

Journal

  • Journal of Japanese Society of Oral Implantology

    Journal of Japanese Society of Oral Implantology 14(3), 20-35, 2001-09-30

    Japanese Society of Oral Implantology

References:  33

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008136845
  • 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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