الفهرس 
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Abstract
A single operator prepared a standardized Class II MOD cavities in 60 sound extracted human molars. Three RBC materials were used for restorations (n = 20 for each material) according to manufacturer’s instructions as follows: a conventional RBC, Filtek Z250; a bulk-fill RBC, Tetric EvoCeram and Sonic-Fill RBC. Cusp deflection was evaluated using digital image correlation technique in 10 restorations from each material however marginal adaptation test was evaluated using scanning electron microscope in the remaining restorations from each material. Forty patients, each with three Class II restorations under occlusion, were enrolled in this study. A total of 120 restorations were placed, 30 restorations for each material, as follows: a conventional RBC, Filtek Z250; a bulk-fill RBC, Tetric EvoCeram and Sonic-Fill RBC. A single operator placed all restorations according to the manufacturers’ instructions. Immediately after placement the restorations were finished/polished. Clinical evaluation was performed at baseline and at 6 month intervals after placement by two other independent examiners using modified United State Public Health Service (USPHS) criteria. The changes in the USPHS parameters during the 18 months period were analyzed with the Friedman test. Comparison of the baseline scores with those at the recall visits was made using Friedman test. The level of significance was set at p< 0.05.Results: The difference between the mean cusp deflections of teeth restored with conventional RBC ( Filtek Z250) placed in layering technique and those restored with Bulk Fill RBCs (Sonic Fill & Tetric EvoCeram) was found to be statistically insignificant (P< 0.05). No statistically significant difference in marginal adaptation was found between teeth restored with conventional RBC and those restored with Bulk Fill RBCs. Clinically, All materials showed only minor changes, and no differences were detected between their performance at baseline and after 18 month.