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Journal of Dental Research, Vol. 87, No. 7, 671-675 (2008)
DOI: 10.1177/154405910808700706

Biomaterials & Bioengineering

Damage Maps for Layered Ceramics under Simulated Mastication

J.-H. Kim, J.-W. Kim, S.-W. Myoung1, M. Pines and Y. Zhang*

Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; and
1 School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Korea

Correspondence: * corresponding author, yz21{at}nyu.edu

Ceramic restorations, whether monolithic (single layer) or porcelain-veneered, often chip and fracture from repeated occlusal loading. Occlusion involves the opposing tooth sliding along the cuspal incline surface with an applied biting force (off-axis loading). We hypothesized that off-axis contact–load–slide–liftoff fatigue, as compared with normal axial fatigue loading, produces different fracture modes and fatigue lifespans of layered ceramics. Monolithic glass plates were epoxy-bonded to polycarbonate substrates as a transparent model for an all-ceramic crown on dentin. Off-axis and axial (control) cyclic loading was applied through a hard sphere in water, with a mouth-motion machine. The off-axis loading is more deleterious for contact-induced occlusal surface fracture, but less harmful for flexure-induced cementation surface fracture of brittle layers than the axial loading. This is because of the tangential load component associated with the off-axis loading. Clinical relevance is discussed.

Key Words: off-axis loading • fatigue • cementation radial fracture • occlusal partial cone fracture • layered ceramic structures


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