Effects of remaining dentin thickness on the bond strength o
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The bond strength of resin composites to dentin was reported to be related to either the remaining dentin thickness (RDT) or bleaching treatment. However, information is limited regarding the effects of RDT on the bond strength of bleached dentin. The present study aimed to investigate the effects of RDT on the micro sheer bond strength (SBS) of resin cement to bleached dentin. A total of 120 dentin specimens were prepared and randomly divided into 2 groups: a bleaching group (group B) and a control group (group C). Hydrogen peroxide with a concentration of 35% was applied on the dentin surface for 2 × 1 d for group B, while no bleaching treatment was performed for group C

The SBS values were significantly affected by bleaching treatment, whereas no significant effect was observed for thermocycling. In terms of RDT, a significantly different SBS value was found among the subgroups with different RDTs in group C. However, the RDT did not significantly affect the SBS values of bleached dentin in group B. The SBS values were significantly lower in group B than in group C. A higher percentage of adhesive failure was observed in group B than in group C.

Conclusively, Based on the present findings, it can be concluded that the RDT did not affect the bond strength of resin cement to bleached dentin. Since RDT did not affect the bond strength of resin cement to bleached dentin, bonding procedures should not be performed immediately after intracoronary bleaching, even if the dentin is planned to be removed due to a tooth preparation process.

Source: https://bmcoralhealth.biomedcentral.com/articles/10.1186/s12903-020-01206-3
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