Effect of Dental Bleaching Materials on Remineralization Capacity of Enamel

Methods: Sixty eight unerupted third molar teeth were used in the study. Each teeth were cut from the cementoenamel junction and then sectioned longitudinally into four pieces as enamel specimens. It was constituted 9 groups (n=30) in which 16% and 30% carbamide peroxide gel (Rembrandt XTRA Comfort) and different fluoride gels (APF and neutral NaF) were applied. One of the groups was chosen as a control group and no treatments applied. Bleaching gels were applied to prepared enamel specimens according to the manufacturer's intstructions. Fluoride treatments were applied at the end of the 14th day for 16% carbamide peoxide gel and at the end of the 10th day for 30% carbamide peroxide gel. Biopsy technique was carried out to accomplish inorganic phosfate analysis and solubility values occurred in enamel mineral content was calculated. Control and experimental groups were compared using Variance analysis and paired t-test.

Results: Bleaching materials used in the study increased solubility statistically. Comparing treatment with different fluoride gels following application of both concentrations of carbamide peroxide to the control group, enamel solubility increased significantly. Same findings were observed when these groups compared to NaF and APF gels application without bleaching. When the specimens treated with different concentrations of carbamide peroxide gels compared to the specimens treated with different fluoride gels after bleaching, the difference was not statistically significant.

Conclusion: It was concluded that applying fluoride gels after bleaching to provide remineralization is not sufficient to cover occurred enamel solubility.