Evaluation of areas susceptible to failure in hot-pressed ceramic crowns

Fracture of ceramic materials has been one of the most frequently reported complications for all-ceramic restorations. The aim of the study was to analyze the fracture features of hot-pressed ceramic crowns in order to evaluate areas susceptible to crack initiation and crack propagation correlated with stress areas. The crowns were inspected visually to determine the shape and orientation of the crack. The fracture surfaces of each restoration were documented with photographs of fractographic features and were examined using scanning electron microscopy. The starting point and crack propagation were determined using standard fractographic methods. A systematic approach to failure analysis is important in order to interpret failure data for all categories of ceramic restorations available today. Further studies of clinically relevant fracture testing and other experimental simulation methods are necessary in order to suggest different strategies for restoration design, and tooth preparation. Key-Words: hot-pressed ceramics, crown, fracture features, crack propagation, scanning electron microscopy.