الفهرس 
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Abstract
Aim: The aim of this study was to evaluate the wear behavior of bonded occlusal veneers
manufactured from two different materials (Rosetta SM and Vita Enamic) and their opposing
enamel after chewing simulation.
Methodology: A Mandibular first molar of a typodont model was prepared according to the
conventional occlusal veneer preparation to manufacture 16 occlusal veneers. The occlusal
veneers were separated into two groups (n=8) based on the material of construction: (group
A: (Rosetta SM occlusal veneers), group B: (Vita Enamic Occlusal veneers)). The prepared
typodont tooth was scanned then occlusal veneers of the two groups were designed, milled
and checked for seating under magnification. The 16 occlusal veneers were bonded according
to the manufacturer instructions’ to their corresponding epoxy resin dies which were
duplicated from the prepared typodont tooth using rubber base duplicating material to obtain
16 epoxy resin dies. The 2-body wear test of the occlusal veneers and their opposing enamel
was performed using chewing simulation machine with 49 N of mastication force and 37,500
cycles, which clinically simulates 3 months of chewing condition. Wear behavior of both
occlusal veneers and their natural antagonist were assessed using electronic digital balance to
detect weight loss and non-contact optical profilometer to detect surface roughness changes.
Results: Comparison between the 2 groups using independent t-test showed that the weight
loss of Rosetta SM occlusal veneers were higher than Vita Enamic occlusal veneers p value
<0.0001 however there were no statistically significant difference regarding the opposing
enamel of both materials p value =0.13. Based on independent t-test there was no statistical
difference regarding the roughness of the occlusal veneers before and after wear simulation p
value =0.12 however, the roughness of enamel opposing Vita Enamic was statistically higher
than Rosetta SM after wear simulation test p value =0.02.
Conclusions: We concluded that Rosetta SM occlusal veneers have better wear resistance
than Vita Enamic occlusal veneers. However, the Rosetta SM occlusal veneers showed better
influence on the enamel antagonists in comparison to Vita Enamic occlusal veneers after
wear simulation.