Fracture Resistance of Composite Veneers with Different Preparation Designs

What is it about?

The aim of this in vitro study was to examine the fracture load of composite veneers using three different preparation designs. Fifteen extracted, intact, human maxillary central incisors were selected. Teeth were divided into three groups with different preparation design: 1) feather preparation, 2) bevel preparation, and 3) incisal overlap- palatal chamfer. Teeth were restored with composite veneers, and. the specimens were loaded to failure. The localization of the fracture was recorded as incisal, gingival or combined.

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Why is it important?

Composite veneers with incisal overlap – palatal chamfer showed higher fracture resistance compared to feather preparation and bevel preparation. The most common mode of failure was debonding for veneers with feather preparation and fracture when incisal edge is reduced. The most frequent localization of fracture was incisal.