Evaluation of mineral content of tooth enamel after application violet led associated with 35% hydrogen peroxide.

Background: The aim of this study was to evaluate the microhardness and quantify the presence of minerals (Calcium and Phosphorous) of tooth enamel submitted to bleaching with violet LED light, either associated with 35% hydrogen peroxide gel, or not.

Methods: Bovine incisors were selected and divided into 4 Groups according to the bleaching technique used: C- Without bleaching (Control); VL- violet LED; HP- 35% Hydrogen Peroxide; HP+VL- 35% Hydrogen Peroxide + violet LED. The response variables were surface microhardness (n = 12), Energy Dispersive Spectroscopy (EDS) (n = 6) and scanning electron microscopy (SEM) (n = 3).