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Adhesive dentistry has revolutionized our field of dentistry and composites have now become the material of choice. The hybrid Composites developed for posteriors teeth have a compressive strength comparable to that of amalgam but Polymerization shrinkage of these composites still seems to affect the clinical longevity of the restoration Newer materials have been developed to overcome this problem, one such material is Fiber reinforced composite. This study was under taken to evaluate the fracture resistance of teeth restored with posterior composites and Fiber reinforced composites.