Relação entre o pH, a presença de cálcio no gel clareador e a perda mineral do esmalte de dente bovino

Abstract

To analyze the pH of bleaching gels based on hydrogen peroxide and to correlate with possible changes in the surface and mineral content of dental enamel caused by gels with and without calcium addition. Material and method: Four study groups (N = 5) were used: Pola Day - PH at 7.5%, Polaoffice - PH at 37.5%, Whiteness HP Blue Calcium - PH at 35% Ca, treated according to manufacturer, and control group without contact with the bleaching gel. The bleaching gels were manipulated and applied on the bovine enamel, later the surfaces were analyzed in SEM and EDS. The pH of the products was measured with a pH meter and the calcium concentration was obtained through ion chromatography. Results: PH 7,5% presented as the group with the most acidic pH, lower calcium concentration and SEM image with superficial alterations more evidenced compared to the other groups. EDS analysis did not demonstrate differences after statistical analysis with one way ANOVA. The chromatograph showed that PH 35%Ca was the group with the highest concentration of calcium in its composition. Conclusions: Bleaching gels that have acidic pH can cause damage to the surface of the enamel, however, the inclusion of calcium in the composition of bleaching gels allows a neutral or alkaline pH, minimizing mineral loss. Ion chromatography is effective for determining the concentrations of the minerals present in the composition of the bleaching gels