Evaluation the cohesive strength of the composite using different monomers

Purpose: The purpose of this study was to evaluate the cohesive strength of the composite using different resinous monomers to lubricate instruments used in the Restorative Dental Modeling Insertion Technique. Materials and Methods: The composite specimens were made by using a prefabricated Teflon device. Different resinous monomers were used at the interface to lubricate the instruments, totaling 72 specimens divided into 6 groups: Control Group, no resinous monomer was used; Composite Wetting Resin; C&B Liquid; Scotchbond Multi-Purpose Adhesive; Adper Single Bond Adhesive; Prime & Bond NT. Specimens were submitted to the circular area tensile test to evaluate the cohesive strength at the composite interfaces. Data was submitted to the ANOVA and Tukey tests (á =5%). Results: ANOVA showed a value of p=0.00, which indicated that there were significant differences among the groups. The average means (SD) for the different groups were: Adper Single Bond Adhesive: 26(12) a; Control Group: 28(3) ab; Prime & Bond NT: 32(12) ab; Composite Wetting Resin: 36(9) abc; C&B Liquid: 38(7) bc; Scotchbond Multi-Purpose Adhesive: 46(10) c. Accompanied by groups of the same letters show no statistically significant differences. Conclusion: It was concluded that only the Scotchbond Multi-Purpose Adhesive, used for direct restorations, had a higher statistically significant bond strength value than the Control Group, Adper Single Bond Adhesive and Prime & Bond NT. Adper Single Bond with Adhesive showed lower statistically significant mean value than C&B Liquid, recommended only for indirect restorations. The others did not differ from each other.