After Different Surface Treatments

Objective: The purpose of this study was to evaluate the effects of different surface treatments on the shear bond strength (SBS) of a composite resin to the various resin matrix ceramics (RMC). Background: Clinical applications of physical and chemical surface conditioning methods may be required for RMC to optimize the adhesion of additional resin materials. Materials and methods: Ninety-nine RMC specimens (6x6x2mm) were prepared from a resin nanoceramic (RNC), a polymer-infiltrated hybrid ceramic (PIHC), and a flexible hybrid ceramic (FHC) block with a cutting machine under copious water. All specimens divided randomly into three surface treatment subgroups (n=11): (1) untreated (Cnt), (2) tribochemical silica coated (Tbc), and (3) neodymium-doped yttrium aluminum garnet (Nd:YAG) laser irradiated with 3 W (150mJ/pulse, 20Hz) for 20sec. A nanohybrid composite resin was layered with a disc-shape mold (2x3mm) onto the ceramics and submitted to thermal cycling (3000 cycles, 5-55 degrees C). The SBS test of specimens was performed using a universal testing machine. Data were statistically analyzed with two-way analysis of variance (ANOVA) and Tukey HSD test (=0.05). Results: The type of RMC, surface treatments, and their interactions was statistically significant on SBS, according to the ANOVA (p<0.05). Both the Tbc and Lsr surface treatments significantly increased the SBS values of FHC (p<0.001), while significant increases were observed only for Lsr0applied RNC and Tbc applied PIHC groups (p