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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)257-262
Number of pages6
JournalDental materials journal
Volume34
Issue number2
DOIs
Publication statusPublished - 2015 Jan 19

Keywords

  • CAD/CAM
  • Crown
  • Fitting accuracy
  • Fracture resistance
  • Porous zirconia

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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    Nakamura, T., Sugano, T., Usami, H., Wakabayashi, K., Ohnishi, H., Sekino, T., & Yatani, H. (2015). Fitting accuracy and fracture resistance of crowns using a hybrid zirconia frame made of both porous and dense zirconia. Dental materials journal, 34(2), 257-262. https://doi.org/10.4012/dmj.2014-145