الفهرس 
Historical background of resin based composite:
Classifications of composite resins:Only 14 pages are availabe for public view
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Abstract
Purpose: to evaluate and compare marginal seal of different composite restored Class Vcavities with different cavosurface margins.Keywords: Bulk fill posterior composite, Bulk fill flowable composite, conventional composite, microleakage, cavosurface configuration margins, digital stereomicroscope,thermocycling.Materials & Methods: Sixty caries-free, freshly extracted molars were selected for this study and stored in sterile normal saline solution. The roots were embedded into acrylic resin block 2mm below cement-enamel junction. A standardized Class V cavity, 4 mm wide(mesial-distal), 3 mm high (occlusal-gingival), and 3 mm deep, was prepared on the buccal surface of each tooth with the occlusal margin located in enamel and the gingival margin located in dentin 1.0 mm below the cement-enamel junction. The teeth were randomly divided into two main groups (n=30) based on the configuration of the cavosurface margins as follows GroupI: The cavosurface margins were 90°butt joint. GroupII: Beveled cavosurface margins. The adhesive system were applied to all prepared teeth then cured with LED curing unit prior to application of the resin composite.