Abstract
Abstract Ceramic materials suffer from a number of limitations which restrict their use in dental restorations. Chief among these shortcomings is their extreme brittleness which is manifested as a low ability to absorb elastic strain energy during structural failure. This property is embodied in the material parameter, fracture toughness or K IC . The fracture toughness values of two types of dental porcelains, the feldspathic and aluminous porcelains, were determined by the indentation technique. The aluminous porcelains were significantly tougher than the feldspathic porcelains. These differences in K IC were attributed to differences in the nature of crack-microstructure interaction occurring in the two types of porcelain.
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