Background:CPP-ACP (Phosphopeptide-Amorphous Calcium Phosphate) has an important role in caries prevention in pediatric patients. This study was done, because of the great use of CPP-ACP and the need for restoration for teeth treated with CPP-ACP as well as the importance of shear bond strength of adhesives in the success of restorations.Objectives:This study aimed to evaluate the effect of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on shear bond strength of dental adhesives to enamel of primary teeth molars.Materials and Methods:This in vitro study was conducted on 180 extracted primary molars. They were randomly divided into 6 groups and each group was divided into 2 subgroups (treated with CPP-ACP and untreated). In subgroups with CPP-ACP, enamel was treated with CPP-ACP paste 1 h/d for 5 days. Types of adhesives that were evaluated in this study were Tetric N-Bond, AdheSE, AdheSE One F, single Bond 2, SE Bond, and Adper Prompt L-Pop. Shear bond strength was tested with a universal testing machine and mode of failure was evaluated under stereomicroscope. Data were analyzed by T test, 2-way analysis of variance (ANOVA), Tukey and Fisher exact test using SPSS18. P < 0.05 was considered as significance level.Results:Shear bond strengths of different adhesive systems to enamel of primary teeth treated and untreated with CPP-ACP showed no significant difference (P > 0.05). Mode of failure in all groups regardless of CPP-ACP administration was mainly adhesive type. Our results indicated that CPP-ACP did not affect shear bond strength of studied adhesives to primary teeth enamel.Conclusions:To have a successful and durable composite restoration, having a high strength bonding is essential. Considering the wide use of CPP-ACP in preventing tooth decay and the role of adhesive shear bond strength (SBS) in success of composite restoration, we conducted the present study to evaluate the effect of CPP-ACP on the SBS of adhesives to primary teeth enamel.

Aim and goals: The aim of this study was to evaluate and compare the shear bond strength of six adhesive systems to enamel of primary teeth.Method: This experimental in vitro study was performed on 72 extracted primary molars. The teeth were randomly divided into six groups. In each group one of the adhesives; Tetric N-Bond, AdheSE, AdheSE One F, Single Bond 2, SE Bond, and Adper Prompt L-Pop, were used. After preparing the flat enamel surfaces on buccal or lingual and applying adhesives, composite was adhered to the surfaces and after 24 hours storage and thermocycling (500 cycles, 5-500˚C), shear bond strength was tested with a universal testing machine and mode of failure was evaluated by a stereomicroscope. Data was analyzed by SPSS18 using Anova, tukey and fisher's exact test. P<0.05 was considered as the level of significance. Results:The shear bond strength of Teric N-Bond was significantly higher than SE Bond (P=0.012), AdheSE (P=0.000), AdheSE One F(p=0.001) and Adper Prompt L-Pop(P=0.001). Shear bond strength of Single Bond 2 was significantly higher than AdheSE(P=0.004), AdheSE One F(P=0.006) and Adper Prompt L-Pop (P=0.006). Mode of failure in all groups was mostly adhesive. Conclusion:The shear bond strength of etch-and-rinse adhesive systems were higher than self-etch adhesives except for one adhesive (SE bond) and the bond strength of self-etch adhesives were not significantly different.