Fracture of porcelain-veneered structures in fatigue

被引：95

作者：

Kim, B. ^{[1
]}

Zhang, Y. ^{[1
]}

Pines, M. ^{[1
]}

Thompson, V. P. ^{[1
]}

机构：

[1] NYU, Coll Dent, Dept Biomat & Biomimet, New York, NY 10010 USA

来源：

JOURNAL OF DENTAL RESEARCH | 2007年 / 86卷 / 02期

关键词：

porcelain-veneered structures; contact fatigue; fracture; ceramic; crowns;

D O I：

10.1177/154405910708600207

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Porcelain-veneered crowns are widely used in modern dentistry, and their fracture remains problematic, especially in all-ceramic systems. We hypothesized that substructure properties have a significant effect on the longevity of porcelain-veneered crowns. Flat porcelain/metal or porcelain/ceramic structures were cemented to dentin-like composite, and a mouth-motion cyclic load of 200 N was delivered by means of a tungsten carbide spherical indenter (r = 3.18 mm), emulating occlusal loading on crowns supported by dentin. Findings indicated that porcelain on a low-hardness gold-infiltrated alloy was vulnerable to both occlusal surface contact damage and porcelain lower surface radial fracture, while porcelain on a higher-hardness palladium-silver alloy fractured chiefly from occlusal surface damage. The advantage of a high-modulus metal substructure was less pronounced. Fracture in the porcelain/zirconia system was limited to surface damage in the veneer layer, similar to that in the porcelain/palladium-silver system. Bulk fracture, observed in veneered alumina layers, was not found for zirconia.

引用

页码：142 / 146

页数：5

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