インプラント支台クラウンの咬合接触の強さが歯冠および支持骨の応力分布に及ぼす影響

DOI Web Site PubMed 被引用文献8件 参考文献28件
  • 前澤 周文
    東京医科歯科大学大学院医歯学総合研究科口腔機能再構築学系摂食機能回復学講座インプラント・口腔再生医学
  • 若林 則幸
    岩手医科大学歯学部歯科補綴学第一講座
  • 横山 紗和子
    東京医科歯科大学大学院医歯学総合研究科口腔機能再構築学系摂食機能回復学講座インプラント・口腔再生医学
  • 塩田 真
    東京医科歯科大学大学院医歯学総合研究科口腔機能再構築学系摂食機能回復学講座インプラント・口腔再生医学
  • 鈴木 哲也
    岩手医科大学歯学部歯科補綴学第一講座

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  • Influence of Intensity of Occlusal Contact in Implant-Retained Single Restoration on Stress Distributions of Crown Surface and Supporting Bone

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Purpose: This study investigated the influence of intensity of occlusal contact, or occlusal height of an implant-retained single restoration on the stress in the crown surface and supporting bone.<BR>Methods: A two-dimensional finite element model of the maxillary and mandibular first molars with supporting periodontal structures was created (Model M-M). One of the molars was replaced by a restoration retained by a thread-type implant to produce Model I-M (implant in maxilla) and Model M-I (implant in mandible). The models were isotropic and linearly elastic, except for the periodontal ligament with a non-linear material property to simulate the tooth movements. The tooth-to-tooth contact under the bite force was simulated by the vertical displacement of the mandible up to 0.24 mm from the initial occlusal contact. Non-linear contact analysis was conducted to calculate the stress in both the restoration and the supporting tissues.<BR>Results: To obtain a restoration that shows the same stress in the occlusal surface as that in the natural molars under the maximum bite force, the occlusal heights in Models I-M and M-I were to be reduced by 0.10 mm and 0.11 mm, respectively. The restorations were not expected to occlude with their natural molar antagonists under bite force lower than 13.0% and 15.8% of the maximum force, respectively.<BR>Conclusion: Reduction in the intensity of the occlusal contact, or decreased occlusal height of an implantretained single restoration, allows the establishment of an equivalent occlusal stress with the natural molars under the maximum bite force. This adjustment, either during fabrication or try-in procedure, can suppress excessive stress that may be created in the tissues. With this procedure, however, the restoration does not contact the antagonistic tooth under a relatively low bite force.

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