オール・セラミック・クラウンの基礎的検索　Ｉ　　適合性について

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  • Fundamental investigation of all- ceramic crowns. Part 1 Fit of all-ceramic crowns.
  • Part 1. Fit of All-Ceramic Crowns
  • 第1報適合性について

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A search of the literature revealed very scant information on the fit of the Cerestore crown recently introduced. A stainless steel master model with full shoulder was fabricated and studies were carried out on the model. The fit of the Cerestore crowns and the porcelain-fusedto-metal crowns was compared with respect of each stage of fabrication and the cementing stage. The fit of the Cerestore crowns was evaluated by comparing the maximum marginal openings of the two types of crowns.<BR>The maximum marginal opening of the Cerestore crowns was 11 μm in the core firing stage, 15 μm in the veneering stage, 19 μm in the glazing stage, and 34 μm in the cementing stage, which were one fourth of that of the porcelain-fused-to metal crowns. Cerestore crowns showed excellent fit as compared with the porcelain-fused-to-metal crowns. Cross-sections of all the specimens were also examined and they revealed better fit in the case of the Cerestore crowns.

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