1/8/2024 0 Comments Fracture glass app wburClinical trials of all-ceramic restorations reveal that fracture of the restorations is one of the main reasons for failure 3. The stiff and brittle ceramic materials are susceptible to fracture, in particular when exposed to tensile stresses 2. The use of all-ceramic restorations has increased since the introduction of high-strength core ceramics as an alternative to metal cores 1. Design features seem to be of great importance for fracture initiation. The fracture features were similar for zirconia, glass-ceramic, and alumina single-tooth restorations. The margin of dental all-ceramic single-tooth restorations was the area of fracture origin. Three cases of occlusal chipping were found. The results revealed that all core and veneer fractures initiated in the cervical margin and usually from the approximal area close to the most coronally placed curvature of the margin. One crown was not categorized because of difficulty in orientation of the fragments. The material comprised fractured restorations from one canine, 10 incisors, four premolars, and 11 molars. Fractographic features were examined using optical microscopy to determine crack initiation and crack propagation of the restorations. Fourteen lithium disilicate glass-ceramic restorations and 13 zirconia-based restorations were retrieved and analyzed. Twenty-seven crowns and onlays were supplied by dentists and dental technicians with information about type of cement and time in function, if available. The aim of this study was to analyze the fracture features of glass-ceramic and zirconia-based restorations fractured during clinical use. Fractures during clinical function have been reported as the major concern associated with all-ceramic dental restorations.
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