Fracture resistance of teeth restored with different resin-based restorative systems

Abstract: The aim of the present study was to evaluate the fracture resis-tance of teeth restored with resin composite. Forty-eight maxillary pre-molar teeth were chosen and randomly divided to six groups: G1 (con-trol): sound teeth; G2: MOD preparation, unrestored; G3: MOD + Adper Single Bond 2 / P60; G4: MOD + Adper Easy One / P60; G5: MOD + P90 restorative system; G6: MOD + Adper Easy One / P90 Bond / P90. Speci-mens were subjected to compressive axial loading (0.5 mm/min). Flex-ural strength and the modulus of elasticity were also tested (n = 7). The only statistical equivalence with sound teeth was noted for G3 (p < 0.05). Flexural strength and the modulus of elasticity varied among the com-posites tested (n = 10). The reestablishment of the resistance to fracture in premolars subjected to Class II MOD preparations is restorative-sys-tem-dependent. The silorane restorative system is not able to recover the resistance to fracture.Descriptors: Compressive Strength; Dentin-Bonding Agents; Dental Restoration, Permanent.