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Abstract
The present in vitro investigation was designed to study the effect of some technical variables and resin phase modification on micro leakage of direct resin composite restorations.
The aim of the study was in three folds, the first was to investigate the influence of using different application techniques; bulk filling technique, horizontal filling technique, and oblique incremental filling technique. The second, was to study the effect of the modifications of resin matrix i.e., the use of low–shrinkage composite (InTen-S) material versus microhybrid composite resin restorations on the marginal sealing of both occlusal and gingival margins at six month storage. The third was to study the effect of different adhesive systems: two steps, self-etching. Primer adhesive system (6th generation) AdheSE and single step, self-etching primer adhesive system (7th generation) on the marginal sealing G-bond.