Adhesive post-endodontic restorations with fiber posts: push-out tests and SEM observations

Objectives. Nowadays, the restoration of endodontically treated teeth is based on the use of materials with a modulus of elasticity similar to that of dentin (18.6 GPa). Fiber posts, resin cements and some composite resins all have this characteristic. This study evaluated the bond strength between luting materials, root dentin and fiber posts through push-out tests and examined the integration among these three components through scanning electron microscopy. Methods. Endodontically treated extracted teeth and plastic plates were used to test the interface between luting agent and dentin and luting agent and post. Results. Chemical affinity between different components (luting materials and fiber posts) is extremely important in achieving high bond strength. The bond strength tests and SEM observations showed that in vitro, composite resins perform better than resin cements. Significance. The in vivo use of these materials may significantly reinforce residual tooth structure therefore reducing the risk for fracture and debonding.