INTERNATIONAL JOURNAL OF PROSTHODONTICS, vol.32, no.5, pp.433-438, 2019 (SCI-Expanded)
Purpose: To investigate the effects of different combinations of self-adhesive resin cements and surface treatments on the microtensile bond strength (mu TBS) of different CAD/CAM resin-matrix ceramics. Materials and Methods: Two different types of CAD/CAM resin-matrix ceramics (LAVA Ultimate [LU] and Vita Enamic [VE]) were used. Slices 5 mm in thickness were obtained from each CAD/CAM material. Samples of each ceramic were randomly separated into the following surface treatment groups: (1) Control group with no surface treatment; (2) 9.5% hydrofluoric acid (HF) + universal adhesive (UA, Single Bond Universal, 3M ESPE); and (3) Sandblasting with 50-mu m aluminum oxide particles (SN) + UA. Two different types of recently developed resin cement (RelyX U200, 3M ESPE; SET PP, SDI Dental Limited) were applied to the treated ceramic slices in each group. After 24 hours, parallel sections were removed from the specimens, and microbeam-shaped sticks (1.0 x 1.0 x 10 mm) were prepared. The mu TBS test was performed, and the data were statistically analyzed. Results: Statistical analyses revealed differences among the study groups (P < .05). The control groups of each resin cement exhibited lower mu TBS values than the groups that received surface treatment (P < .05). The effect of surface treatment on mu TBS (partial eta-squared [eta p(2)] = 0.381) was more significant than the effects of ceramic (eta p(2) = 0.267) and self-adhesive resin cement (eta p(2) = 0.184). Conclusion: Surface treatment is the most important factor affecting the mu TBS of resin cement to CAD/CAM materials, followed by the type of resin-matrix ceramic and the type of resin cement, respectively.