الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
composite resin technology has continuously evolved since its introduction by bowen (1962) as a reinforced Bis-GMA system. a major breakthrough in composite technology was development of photo-curable resins. A continued development resulted in materials with reduced particle size and increased filler loading that significantly improved the universal applocability of light-cured composite resins. resin composites are widely used in dentistry and have come one of the most commonly used esthetic restorative materials because of their adequate strength, excellent esthetics, moderate cost compared with ceramics, ability to be bonded to tooth structure, improvements in composition, simplification of the adhesive procedures represent additional advantages