Effect of the calcium silicate and sodium phosphate remineralizing products on bleached enamel

Context and Aims: This study evaluated the effect of calcium silicate and sodium phosphate (CSSP) dentifrice and serum on the surface of enamel bleached with hydrogen peroxide (H 2 O 2 ). Materials and Methods: A total of 160 bovine enamel slabs were bleached with 35% H 2 O 2 and treated with sodium fluoride (NaF) dentifrice-GI, CSSP dentifrice-GII; CSSP dentifrice + CSSP serum-GIII, or NaF dentifrice + NaF gel-GIV. The dentifrices were applied using a brushing machine three times daily for 7 days. After brushing, sodium phosphate gel and CSSP serum were applied. The microhardness (KNH, n = 14), surface roughness (Ra, n = 14), energy dispersive spectroscopy (n = 6), and scanning electron microscopy (n = 6) were assessed at t 0 (before bleaching), t 1 (after bleaching), and t 2 (after postbleaching treatments). Statistical Analysis Used: The data were subjected to a two-way analysis of variance and Bonferroni’s test. Results: The KNH decreased at t 1 (P < 0.001) but recovered at t 2 for all treatments, although only GII showed restored baseline values (P = 0.0109). The surface roughness increased at t 1 (P < 0.001) and reduced at t 2 (P < 0.001) for all groups, with no significant differences among groups. Enamel composition and morphology did not differ after the treatments, except for silicon accumulation in GIII. Conclusions: Postbleaching treatment with CSSP dentifrice and serum yielded superior remineralizing effects on bleached enamel.