Time-Course Diffusion of Hydrogen Peroxide Using Modern Tecnologies

Nowadays it is possible to observe in the literature that the researchers are questioning about the efficiency of the light accelerated dental bleaching. The works available compare this technique with the home bleaching in several different ways, but in the great majority of these comparisons are clinical. Objectives: To quantify and determine through in vitro assessments using modern technologies the time-course diffusion of the hydrogen peroxide through a bovine crystalline structure by fluorescence. Methods: It was used a bovine teeth, a 405 nm LASER 150 mW, a Ruthenium fiber, a spectrophotometer, a commercial 35% Hydrogen Peroxide bleaching agent (HP 35% - FGM – Joinville- SC - Brasil) and two glass capillary tubes. The capillary tubes were placed in each face of the teeth, in one of capillaries it was placed a 0,9% physiologic solution and the other capillary was flooded with the 35% Hydrogen peroxide liquid. The Ruthenium fiber was placed in the capillary that was placed at the lingual face ( with physiologic solution) and the fluorescence was collected for six periods of time.Results: The obtained results showed a significative increase of the fluorescence over the time, what shows the diffusion of the hydrogen peroxide through the cystalline structure; these results were ploted in graphic way. Conclusions: This method showed to be effective to quantify the time-course diffusion through the bovine crystalline structure over time.