Changes in Bleached Enamel Microhardness After Application of Casein Phosphopeptide-Amorphous Calcium Phosphate (CPP-ACP) and Diode Laser:An in vitro study

摘要

Tooth bleaching reduces the surface microhardness of enamel. The aim of this study was to evaluate the effect of CPP-ACP pastewith diode laser simultaneously on surface microhardnessof enamel of bleached teeth. In this in vitro experimental study, forty fivehealthy anterior teeth of bovine were selected and divided into three groups. Basis microhardnessof all the samples was measured by Vickers hardness test. Then all the samples were bleached using 38% H202 and their surface microhardnesswere measured. Then, the first group was treated with CPP-ACP paste, the second group was irradiated with diode laser.and in the third group CPP-ACP+diode laser were used simultaneously. Then the microhardnessof enamel wasmeasured again. One-wayANOVA followed by Tukey test was used for statistical analysis. Significanceset was considered at p<0.05. Tooth bleaching reduced surface microhardness of enamel. The final microhardness of CPP-ACP group hasshown significant increase compared to the diode laser group (p = 0.001), while microhardness of enamel in the first group did not show significant difference compared to the CPP-ACP +diode laser group (p = 0.80). Use of CPP-ACP paste increasesmicrohardnessof enamelafter bleaching. But use of diode laser associated withCPP-ACP paste does not have any influence on performance ofCPP-ACP paste.