Clinical Evaluation of Two Fiber Reinforced Resin Composites Versus Nanohybrid Resin Composite in Posterior Restorations: Randomized Clinical Trial

Statement of the problem:

With limited evidence based information in literature about using fiber-reinforced composite (FRC) restorations in stress bearing posterior areas, it is beneficial to evaluate the newly introduced materials using a randomized clinical trial to test the null hypothesis that this new material "fiber reinforced resin composites" will have the same clinical performance as the nanohybrid resin composite restoration in such situation

Rationale:

Improvements concerning the esthetic and mechanical properties of dental resin composites have resulted in widespread use of these materials in both anterior and posterior teeth. However, resin composites still have a number of limitations in posterior teeth, mainly because of problems related to technique sensitivity, polymerization shrinkage and low fracture resistance, Due the failures of this kind, it is still controversial, whether restorative composites should be used in large high-stress bearing applications such as in direct posterior restorations.

Fiber-reinforcement of resin-based composite restorations has been proposed to increase resistance of materials fracturing under high stress-bearing cavities. Fiber-reinforced composite (FRC) is made of a polymer matrix, impregnated with fibers. The fibers allow the stresses to be distributed throughout the restoration. Since the role of the fibers is to improve the structura lproperties of the material by acting as crack stoppers, the FRC framework provides strength and rigidity of the composite materials.