陶材前装キャスタブル・セラミックス・クラウンのコーピングデザイン

  • 伊藤 康子
    日本歯科大学新潟歯学部歯科補綴学教室第2講座
  • 飯島 浩
    日本歯科大学新潟歯学部歯科補綴学教室第2講座
  • 畑 好昭
    日本歯科大学新潟歯学部歯科補綴学教室第2講座

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タイトル別名
  • Coping Design for Porcelain Fused to Castable Ceramic Crown.

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The purpose of this study was to examine how various designs of coping affect the strength and stress distribution of the porcelain fused to castable ceramic (PFC) crowns. Four different coping designs and three types of crown were made:(Model 1) 1/3 of the labial cervical to the incisal;(Model 2) the labial to incisal;(Model 3) the labial to incisal, and 1/3 of the lingual;(Model 4) covering the entire labiolingual region.(Model 5) a castable ceramics crown; and (Model 6) a porcelain-fused-to-metal (PFM) crown.<BR>All the models were subjected to destructive strength test and stress analysis using the finite element method (FEM), and the results were as follows:<BR>1. When stress was applied to PFC crowns at 45° to the incisal region, the destructive strength tended to decrease as the porcelain-fused area increased. The destructive strength of Model 4 significantly decreased compared with the others when stress was applied to the center of the lingual at 45°.<BR>2. FEM analysis showed that, in vital abutment teeth under four stress conditions, there were no marked differences in the tensile stress distribution and values among the different coping designs.<BR>3. From the viewpoint of dynamics, Models 1 and 2 were considered to have the most desirable coping designs for PFC crowns.

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