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Methods: Forty restorations (n = 20/group) were fabricated using resin matrix ceramic (VarseoSmileTM) with different designs as follows: group 1: overlay restoration with chamfer margin; group 2: overlay restoration with chamfer margin located 3 mm above the gingiva. Restorations were bonded to resin dies using 3M RelyX Luting Cement. Compression forces were applied with a 4 mm diameter steel bar at the midline fissure of each crown using the universal testing machine. Restorations were loaded until fracture, and fracture resistance at maximum load was recorded. Statistical analysis: A t-test was used for statistical comparison between groups.
Mekled et al. (Thu,) studied this question.