Effect of high-fluoride dentifrice on enamel erosion adjacent to restorations in vitro

Abstract

Aim: This in vitro study analyzed the antierosive potential of a high-fluoride dentifrice on enamel adjacent to restorations. Methods and Materials: Enamel blocks (6 3 6 3 3 mm) from bovine incisor teeth were restored with three different restorative materials (resin, conventional glass ionomer cement, and resin-modified glass ionomer cement) and treated with dentifrices containing 0, 1100, or 5000 ppm F. After restorative procedures, initial surface Vickers hardness of the blocks were obtained. The specimens were submitted to pH cycles (4 3 90 seconds in soft drink) and treatments for five days. Between the challenges and overnight, the blocks remained in artificial saliva. At the end of the experiment, the final hardness was assessed and the percentage of surface mineral loss (%SML) was calculated. A 333 factorial design was used to conduct statistical analysis. Data were analyzed by analysis of variance and t-test, with significance level fixed at 5%. Results: High-fluoride dentifrice decreased demineralization caused by erosive challenge regardless of the restorative material used (p,0.001). Likewise, the blocks restored with conventional glass ionomer cement showed lower values of SML irrespective of dentifrice used (p,0.001). Conclusion: Use of a high-fluoride dentifrice on teeth restored with conventional glass ionomer cement offers additional protection against enamel erosion.