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Fracture of Porcelain-veneered Structures in Fatigue

Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010, USA

^* corresponding author, yz21{at}nyu.edu

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.

KEY WORDS: porcelain-veneered structures • contact fatigue • fracture • ceramic • crowns

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				J.-W. Kim, J.-H. Kim, V.P. Thompson, and Y. Zhang Sliding Contact Fatigue Damage in Layered Ceramic Structures J. Dent. Res., November 1, 2007; 86(11): 1046 - 1050. [Abstract] [Full Text] [PDF]