Effect of bleaching material containing remineralizing agent on the microhardness of enamel surface

Abstract

This in vitro study was evaluated to compare the effect of two hydrogen peroxide based bleaching agents one of them contained remineralizing agent (Flouride) and the other is Flouride free on the microhardness of enamel surface just after the bleaching and after remineralization for 7 and 14 days of daily application using MI paste. A total number of 49 anterior permanent bovine teeth were extracted from sacrificed bovine jaws, scaled to remove soft and hard tissue debris and the roots of all the teeth as well as the incisor halves of crowns were cut off. The enamel labial surface of teeth was flat ground. Samples were divided into two main groups of 21 samples each according to the bleaching agent (Oplalescence Xtra Boost and Power Whitening). Each main group was then divided into 3 subgroups according to the time of remineralization with MI paste (7 days and 14 days). In addition, there was control group (n=7/group). Vickers microhardness test was performed and statistically analyzed .