Abstract
The present study was conducted to assess the adhesive bond strength of the resin cements to hybrid:computer-aided design (CAD) I computer-aided manufacturing (CAM) ceramics under the standard surface treatment (hydrofluoric etching). Two types of hybrid ceramic: Vita Enamic (VE) and Lava Ultimate (LU) were used to prepare a total of 30 specimen blocks for each ceramic. Each material was divided into three different subgroups depending on the type of cement used [Rely X Unicem (Op A), Rely X ARC (Gp B) and GIC (Gp C)] (n= 10). Each specimen surface was polished and treated with hydrofluoric acid (10%). Subsequently, silane coupling agent was applied to the specimen in group A and B. Using a putty mould index, cement was build up on each specimen block. After high intensity light cure of group A and B specimen and settling down of GIC in group C, each block was tested for shear bond strength under a load in universal testing machine. Ten samples from each group were assessed for modes of failure. Data was assessed using analysis of variance and Tukey multiple comparisons test. Comparison between the cements in each hybrid ceramic revealed that the highest mean value was for groups B-VE (18.22 +/- 1.25) and B-LU (16.56 +/- 1.31) and least values were for group C-VE (11.44 +/- 1.84) and C-LU (10.68 +/- 2.17). Further comparison between the two types of hybrid ceramics presented VE to have significantly higher (p<0.05) bond strength. The mode failure mostly observed was adhesive followed by the cohesive and admixed. The study displayed a significant influence of different types of cements on SBS of CAD/CAM hybrid ceramics (p<0.05). Therefore, to achieve maximum adhesive bonding strength among hybrid ceramic materials, a compatible luting cement and surface treatment is critical.