Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges

Dental Materials : Official Publication of the Academy of Dental Materials
Vinicius P FardinGerson Bonfante

Abstract

To evaluate the fatigue life of zirconia-veneered and metal-ceramic crowns comprised by an even thickness or a modified framework design when loaded on marginal ridges. Eighty marginal ridges were present after fabrication of forty molar crowns cemented onto composite-resin replicas and divided (n=20/each), in the following groups: metal-ceramic with even thickness (MCev) or with a modified framework design (MCm, lingual collar with proximal struts); porcelain-fused to zirconia with even thickness (PFZev) or with the modified framework design (PFZm). Each marginal ridge (mesial and distal) was subjected to cyclic loading separately with a lithium disilicate indenter for 106 cycles or until fracture. Kruskal-Wallis and Wilcoxon matched pair test (p<0.05) evaluated both marginal ridges. Every 125,000 cycles, the test was interrupted for damage inspection. Weibull distribution (90% confidence bounds) determined the probability of survival (reliability). Weibull 2-parameter contour-plot showed significantly higher fatigue life for PFZev compared to MC, and comparable with PFZm. A significant decrease in reliability was observed between groups from 625,000 until 106 cycles. Metal-ceramic groups presented significantly lower probabil...Continue Reading

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Citations

Nov 6, 2018·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Abolfazl SabouryLeila Moghadam
Jan 10, 2018·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Farhad Tabatabaian
Jul 22, 2018·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Farhad TabatabaianMahshid Namdari
Nov 6, 2020·Journal of Pharmacy & Bioallied Sciences·Rajesh ShettyMallikarjuna Ragher
Apr 15, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Eva JermanBogna Stawarczyk

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