Influencia del ácido ascórbico en la adhesión sobre el esmalte blanqueado: estudio in vitro.

Abstract

The use of teeth whitening is associated with a decrease in restoration-tooth adhesive strength for up to three weeks afterits use. In order to find a solution to this problem, this study was carried out to evaluate the effectiveness of 10% ascorbic acid and to rapidly increase the adhesive strength. Sixty recently extracted caries-free bovine teeth were selected, resin discs 3 mm wide and 4 mm in diameter were made, they were divided into 4 groups, Group 1 (control), the conventional adhesive technique was applied, Group 2, 10% carbamide peroxide was applied for 12 days and the conventional adhesive technique was applied, Group 3, carbamide peroxide was applied for 12 days and the conventional adhesive technique was applied, Group 4, carbamide peroxide was applied for 12 days and the conventional adhesive technique was applied, Group 3, 10% carbamide peroxide was applied for 12 days, then ascorbic acid gel was applied for 10 minutes and the conventional adhesive technique was performed, Group 4, 10% carbamide peroxide was applied for 12 days and for 8 hours, ascorbic acid gel was applied and then the conventional adhesive technique was performed, all were subjected to a shear test in a universal testing machine. A one-factor ANOVA was performed with the p value preestablished at 0.05. Groups 1 and 4 obtained similar adhesive strength, while group 2 was the least resistant to the maximum load, obtaining a value of p <0.03 between groups. It is concluded that the use of 10% ascorbic acid for 8 hours after 10% carbamide peroxide reverses the low values of adhesive resistance caused by the free radicals remaining in the freshly bleached enamel.