Bioactive-Vitroceramics Incorporated Into Adhesive Systems: Degree of Conversion and Wettability
Objectives: Objectives: To evaluate the influence of different concentrations of vitreous ceramic particles on the degree of conversion (DC) and wettability in experimental adhesive systems, and to compare their performance to one self-etch (AdheSE, Ivoclar Vivadent) and one etch-and-rinse (Single Bond, 3M ESPE) commercial adhesives.
Methods: Methods: Percentages of 0% (control), 2%, 5% and 10% (by weight) of Biosilicate® were incorporated in 2 experimental adhesive systems: Exp-1 (total etch, 2 steps) and Exp-2 (self-etching, 2 steps). Ten sound human molars were cut perpendicular to the long axis of the tooth into dentin slices (2mm each). Standardized smear layer on the exposed dentin surfaces was achieved with 600-grit silicone carbide paper and water. The slices were randomly assigned to 10 groups (n=3), according to the percentage added and the commercial adhesive systems tested. Degree of Conversion (DC) was analyzed by standard procedure for ATR-FTIR. For wettability, 5mL of each adhesive system was dropped to the dentin surface and kept for 5s. Pictures were obtained (Goniometer) and the contact angle between dentin surface and the adhesive was calculated. Results were analysed by 1-way ANOVA, Tukey, p<.05.
Results: Results: The Exp-2 self-etch adhesive presented lower DC than Exp-1 total-etch, but similar to the commercial systems in all concentrations. It was observed that there is no statistical difference (p>.05) with wettability between commercial and experimental materials regardless concentrations.
Conclusions: Conclusion: The addition of Biosilicate® particles did not affect the DC and wettability of experimental self-etch and total etch adhesive systems. New studies are necessary to prove the viability of this material.