[Bonding interfaces of three kinds of cements and root canal dentin: a scanning electron microscope observation].

Objective: To compare the bonding properties of three kinds of cements by observing the bonding inteffaces of cements and root canal dentin.

Methods: 15 extracted mandibular premolars were divided into 3 groups, and were cemented by Rely X luting, Panavia F and Paracore 5 mL, respectively. Each tooth was sectioned into two parts and the dentin-cement interfaces at the coronal, middle and apical parts of the fiber post were oberved by scanning electron microscope (SEM).