Blanqueamiento interno asistido por activación ultrasónica : un estudio in vitro.

Abstract

INTRODUCTION: Discoloration of non-vital teeth, whether due to extrinsic or intrinsic factors, is a frequent aesthetic problem in dentistry. Internal bleaching is a conservative alternative to more invasive restorative treatments. OBJECTIVE: To determine the effectiveness of internal bleaching assisted by ultrasonic activation in an in vitro study. MATERIALS AND METHODS: An in vitro, prospective, experimental, and quantitative study was conducted. Fifty extracted human premolars were cleaned, instrumented, and artificially stained with hemolyzed blood using centrifugation. The samples were then randomly assigned into five experimental groups (n=10): sodium perborate with deionized water, 37% carbamide peroxide with and without ultrasonic activation, and 35% hydrogen peroxide with and without ultrasonic activation. Tooth color was evaluated with a digital spectrophotometer following the CIELab system at two time points: baseline and final. RESULTS: Sodium perborate (control group) showed the greatest mean color variation (ΔE ≈ 18.8), significantly higher compared to the other bleaching agents. CONCLUSION: Sodium perborate proved to be the most effective bleaching agent in terms of color variation, outperforming carbamide peroxide and hydrogen peroxide. Ultrasonic activation did not demonstrate a significant additional benefit in internal bleaching.