Abstract
ABSTRACT Objective Metal-ceramic prosthesis are the treatment of choice in oral rehabilitation because of their high survival rates. However, there are few reports in the scientific literature about factors that lead to fractures of metal-ceramic prostheses. The aim of this study was to evaluate whether prostheses units number, abutment type and number, type of the prostheses, prostheses position in the mouth, bruxism and occlusal plaque influence the incidence of fractures in fixed metal-ceramic prostheses. Methods For this study, 16 patients were selected, totaling 74 metal-ceramic prostheses installed between 2000-2010, with follow up of at least four years. Besides dental history, other information was collected, such as patients’ gender and age, prostheses installation date, and the ceramic system used. In case of prostheses fracture, a questionnaire was applied to identify signs of bruxism. A clinical evaluation was done to evaluate the prostheses integrity and opposing dentition characteristics. Success, failure and survival rates were determined. Results The results showed that the success rate of metal-ceramic prostheses was 87.8% and the survival rate was 89.1%. In addition, the success rate was independent of patient age, prostheses installation time, number of prosthesis, number of prosthesis’ units and abutments. The qualitative variables also did not show significant statistical results between success and failure rates. Conclusion It was concluded that metal-ceramic prostheses have high success and survival rates, what guarantees longevity and indication of this type of prostheses in daily practice.
Highlights
Metal-ceramic prosthesis are considered the gold standard in oral rehabilitation
Framework fractures are catastrophic in most cases and require replacement by a new prosthesis
Veneering ceramic fractures are more common when associated to zirconia [8]
Summary
Metal-ceramic prosthesis are considered the gold standard in oral rehabilitation. They have been used for more than 40 years and present high success rates [1]. Their use present satisfactory results for patients and dentists alike [2]. Despite of the high success rate of these restorations, fractures are still the most common mechanical complication [1,4,5]. Fractures related to the veneered ceramic influence the prostheses prognostic: if the framework is exposed, a new restoration is needed. Veneering ceramic fractures are more common when associated to zirconia [8]
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