This study indicates that using an incisal overlap– palatal chamfer preparation design significantly increases the fracture resistance compared to feather and bevel preparation designs.R ossellini’s reputation has ebbed and flowed more perhaps than that of any other leading director. Conclusion: The type of preparation has a significant effect on fracture load for composite veneers. The most frequent localization of fracture was incisal. The most common mode of failure was debonding for veneers with feather preparation and fracture when incisal edge is reduced. Results: Composite veneers with incisal overlap – palatal chamfer showed higher fracture resistance compared to feather preparation and bevel preparation. The localization of the fracture was recorded as incisal, gingival or combined.

Teeth were restored with composite veneers, and the specimens were loaded to failure. Teeth were divided into three groups with different preparation design: 1) feather preparation, 2) bevel preparation, and 3) incisal overlap- palatal chamfer. Material and methods: Fifteen extracted, intact, human maxillary central incisors were selected. SUMMARY Background: The aim of this in vitro study was to examine the fracture load of composite veneers using three different preparation designs. Further- more, a diversification of photographic illumination techniques will be illustrat- ed in order to juxtapose optical asso- ciations between the enamel/dentinoe- namel complex/dentin nexus. The main goals for this article are to cog- nize histo-anatomic visualization by in- troducing: (1) Dynamic light interaction, (2) the 9 elements of visual synthesis, (3) dynamic infinite optical thickness, and (4) amplified visual perception ef- fect of the hard dental tissues. The second part of this two-part article will attempt to provide insight on the illumination interactivity and the spa- tial arrangement of the coronal elements of natural teeth through the utilization of this knowledge in the clinical and techni- cal restorative approach. A thorough understanding of the spatial distribution pertaining to the histo-ana- tomic coronal structures and dynamic light interaction of the natural dentition provides the dental team with the ulti- mate strategic advantage with regards to optical integration of the final restor- ation.

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