Effect of fluoride therapy on remineralization and whiting of bleached enamel / 中华医学美学美容杂志

ABSTRACT

Objective To evaluate the effect of fluorin dentifrice on the microhardness and whiting of dental enamel bleached with different concentration bleachers.Methods 6%carbamide peroxide(CP)and 30%CP were selected as bleachers.Twenty undefected molars were subjected to 3 groups.Groups A and B.which composed of 8 teeth each,were tested and group C was the control one.Group A(buccal surface)and group B(buccal surface)were treated with 6%CP.Group A (lingual surface)and group B(lingual surface)were treated with 30%CP.They were bleached 30 min every day for two weeks.The teeth in group B were brushed with fluorin dentifrice for 15 min after bleached every time and then all tested samples were kept in the artificial saliva at 37℃.Vickers microhardness of all teeth and color measurement of groups A and B were made before and at the end of bleaching procedure.Results The difference of microhardness values between the bleached and control samples were not statistically significant(P＞0.05).Brushed with fluorin agent significantly increased the hardness of enamelin group B(P＜0.05).The color change was not significant between bleached samples.Conclusion Using fluoride in the interphase of bleaching makes this therapy safer,and does not affect the whitening effect.