Investigation of the Effect of Using Cavity Disinfectant Before Cementation of CAD/CAM Blocks on Shear Bond Strength

Abstract Objective The aim of this study was to investigate the effect of cavity disinfectant application on the shear bond strength of current CAD/CAM blocks to dentin. Materials and Methods Samples of three CAD/CAM blocks, Celtra Duo, Vita Enamic, and Tetric CAD (2×3×3 mm) were obtained from each material under water cooling. Chlorhexidine digluconate was applied to half of the samples, while the other half remained untreated. Variolink DC and Variolink LC resin cements were used to bond the blocks to the teeth. Results All samples underwent testing to measure shear bond strength. Fracture failure patterns were examined using a stereomicroscope. Statistical analysis was performed using a two-way analysis of variance (ANOVA). In general, teeth treated with 2% chlorhexidine digluconate exhibited lower shear bond strength values. Dual-cure resin cement demonstrated higher shear bond strengths compared to light-cure cement for the tested specimens. Among the CAD/CAM blocks, Celtra Duo exhibited the highest bond strength, while Tetric CAD showed the lowest bond strength value. Conclusion The results of the study showed that cavity disinfectants had a mostly negative effect on the bonding of CAD/CAM blocks to dentin. Clinical Relevance: The use of chlorhexidine before restoration had no beneficial effect on bond strength.