Optic changes due to innovative experimental formulations for bleaching non-vital teeth. In vitro study

Objectives: This study aims to evaluate the efficiency of experimental materials for the internal bleaching of non-vital teeth, compared to commercially available agents based on peroxides. Methods: Sixty extracted teeth divided in six groups underwent endodontic treatment followed by simulated discoloration. For each group, a different bleaching formulation was used. The dental colour was assessed by spectrophotometry. Results: According to the spectrophotometric analysis, the most effective results were achieved for groups treated with TiO2/SiO2/Aa and TiO2/SiO2 with small amount of sodium perborate addition. Conclusions: Our study reveals that internal bleaching with oxidative systems is a plausible innovation.