下顎臼歯部に適用したインプラント周囲骨の三次元有限要素法による応力解析　上部構造による連結の力学的影響

DOI Web Site 被引用文献17件 参考文献61件

書誌事項

タイトル別名
  • Three Dimensional Finite Element Analysis of Bone around Dental Implants in Posterior Mandibular Region. Biomechanics of Implant Connections.
  • Biomechanics of Implant Connections
  • 上部構造による連結の力学的影響

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抄録

The effect of superstructure connection on bone stress around implants was investigated by three-dimensional finite element analysis. Three models (M 1-M 3) of a mandibular segment with a premolar and two distal implants were constructed from CT-scans. In M 1, tooth and implants were not connected ; in M 2, only implants were connected ; and in M 3, tooth and implants were connected.<BR>In M 2, maximum equivalent stress was 60-65% of that in M 1 under mesial loads and 1-point buccal load. Under vertical loads, stress in M 2 and M 1 were similar and concentrated around the loaded implant. Under mesial loads, stress concentrated mesially and distally around each implant of M 1, but in M 2 and M 3, bone stress between implants was low. In M 3, under vertical and buccal loads, high stress concentrated mesial to the mesial implant. Under buccal loading of the tooth in M 3 and of the mesial implant in M 2, similar stress was calculated. Thus lateral guidance on a tooth connected to implants should be avoided.<BR>Regardless of the model, stress in cortical bone was much higher than that in cancellous bone. Therefore, increasing implant diameter (i. e., contact area of cortical bone) may be more meaningful than increasing implant length (i. e., contact area of cancellous bone).<BR>These results may be useful during treatment planning of implant placement and superstructure design.

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