Fitting accuracy and fracture resistance of crowns using a hybrid zirconia frame made of both porous and dense zirconia

Takashi Nakamura, Tsuyoshi Sugano, Hirofumi Usami, Kazumichi Wakabayashi, Hiroshi Ohnishi, Tohru Sekino, Hirofumi Yatani

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The purpose of this study is to evaluate the fitting accuracy and fracture resistance of crowns using a hybrid zirconia frame made of both porous and dense zirconia. Commercial semi-sintered zirconia, sintered dense zirconia and sintered hybrid zirconia were used. Sintered zirconia was milled using the CAD/CAM system, and semi-sintered zirconia was milled and sintered to fabricate molar crown frames. Completed frames were veneered with tooth-colored porcelain. The marginal and internal gaps between frames/ crowns and abutments were measured. Each crown specimen was subjected to a fracture test. There were no significant differences in marginal and internal gap among all the frames and crowns. The crown with the hybrid zirconia frame had a 31–35% greater fracture load than that with the commercial or dense zirconia frame (p<0.01). This suggests that the all-ceramic crowns with a hybrid zirconia frame have a high fracture resistance.

本文言語English
ページ(範囲)257-262
ページ数6
ジャーナルDental materials journal
34
2
DOI
出版ステータスPublished - 2015 1月 19

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 歯科学(全般)

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