Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Original Paper
Fitting accuracy and fracture resistance of crowns using a hybrid zirconia frame made of both porous and dense zirconia
Takashi NAKAMURATsuyoshi SUGANOHirofumi USAMIKazumichi WAKABAYASHIHiroshi OHNISHITohru SEKINOHirofumi YATANI
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2015 Volume 34 Issue 2 Pages 257-262

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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.

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© 2015 The Japanese Society for Dental Materials and Devices
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