Metal-ceramic restorations are widely used in den-tistry with a high degree of general success. However, fracture of these restorations does occur and usually frustrates both the dentist and the patient. Objective: This literature review discusses the factors that may lead to the fracture of these restorations whether they are tooth-supported or implant-supported with the aim of making dentists and technicians aware of these factors to avoid them. Factors reviewed include: tech-nical factors, dentist-related factors, inherent mate-rial properties, direction, magnitude and frequency of applied loads, environmental factors, screw-retained implant-supported restorations, and posterior canti-levered prostheses. Material and Methods: A net-based search in " Pubmed " was performed and com-bined with a manual search. The search was limited to articles written in English. Conclusions: the pub-lished literature revealed that the factors predispos-ing to fracture of metal-ceramic restorations may be related to the technician, dentist, patient, environ-ment, design of the restoration, or to inherent struc-ture of ceramics and others. However, if the dentist and technician understand these factors and respect the physical characteristics of the materials, most of those are avoidable.
Shadid, R. M., Sadaqah, N. R., Abu-Naba’a, L., & Al-Omari, W. M. (2013). Porcelain fracture of metal-ceramic tooth-supported and implant-supported restorations: A review. Open Journal of Stomatology, 03(08), 411–418. https://doi.org/10.4236/ojst.2013.38069