Assessment of the Micro-Tensile Bond Strength of Composites for Indirect Restoration to Enamel and Dentin

This study aims to evaluate the micro-tensile bond strength of two types of composites for indirect restoration luted to enamel and dentin by self-adhesive cement. Sixteen flat enamel and dentin surfaces of human molar were cemented to equal flat specimens from laboratory composite Signum ceramics and CAD/CAM block Cerasmart. Half of the specimens of the group were thermocycling. After that, the samples were prepared for µTBS. From the micro-tensile bond strength tests, we found that thermocycling significantly reduced the adhesive bond. Dentin bonds better to conventional laboratory composites. Enamel bonds are better than composite blocks for milling.