Influence of dental preparation depth and design on the survival of ceramic veneers

Abstract

The demand for aesthetic dental treatments has been growing in recent years. With this, the use of ceramic veneers is increasingly observed, where the tooth needs to be abraded for its cementation. The amount of this wear and the shape that the tooth will be after being prepared still generate discussions among dental surgeons. Thus, the objective of this review is to evaluate the studies of the last 10 years on preparation designs, the amount of dental wear and its influence on the longevity of ceramic veneers. Search in databases for articles about the themes. Previous analyzed in three aspects. Preparation depth: all concluded that preparations restricted to enamel or with minimal dentin exposure obtained the best results. Incisal preparation: preparations with a reduction of up to 2 mm had excellent results, larger preparations offer less resistance to fracture. Preparation design: In this aspect there were divergences among the authors. In the posterior ones, it was observed that vestibular wear does not influence the material resistance, and also greater resistance was observed in teeth with less preparation. On the other hand, while one study observed that teeth with occlusal wear only provide laminates with greater strength, another concluded that catastrophic failures occur only in groups with occlusal wear. Porcelain veneers have excellent longevity results, there are few reported failures, although more long-term studies are needed to detail the type of preparation performed.