In Vitro Study of Mechanical Properties of Teeth Restored with Bulk-fill and Universal Composites Using Different Dentin Adhesives

Abstract Background: The most common dental materials are resin composite direct restorative and dentin adhesives, which marketed with different techniques, application recommendations, compositions, making it difficult to choose the suitable material method for cases. present study aimed investigate mechanical properties of teeth restored universal bulk-fill composites, by using adhesives under in vitro conditions. Material methods: was carried out on freshly extracted premolar molar teeth. After cavity preparation, were conventional adhesive techniques. To assess effect restoration, protocol tooth structure, a transillumination Vickers’ microhardness measurements out. Results: showed an average hardness 55.35 HV at occlusal level while 79.93 same level. A statistically significant difference found between values two composites (p = 0.02). test revealed micro-fissures structure first phase after preparation also polymerization. Conclusions: higher than composite. tested did not significantly affect interface. Fissures can appear any