Clinical Evaluation Of Two Bleaching Systems With Different Light Sources

Objectives: Vital tooth bleaching is a popular treatment modality in dentistry. Today, bleaching techniques achieved significant advances with the use of light sources to activate the bleaching agents. The aim of this clinical study was to compare the whitening efficacy of two different office bleaching systems using different light sources. Methods: Twenty four volunteers having all natural teeth (intact dentition) and maxillary anterior teeth in shade A3 or darker, without restorations on the labial surfaces and no teeth sensitivity participated to this study. Patients received a complete prophylaxis and then were allocated randomly to the one of the treatment groups: Group I (n: 12) received bleaching treatment (37% hidrogen peroxide/ laser White 10/ Biolase,) with diode laser (810nm, 10W/ Laser Smile/ Biolase) activation whereas group II (n: 12) received bleaching treatment (35% hydrogen peroxide/ Remewhite/ Remedent) with plasma arc light (400-490 nm, 2800mV/ cm2/ Remecure CL15) according to the manufacturers' recommendations. The shade change was evaluated using Classical Vita Shade Guide at baseline, after treatment and one week after treatment. Any side effects on teeth or gingiva were recorded by Visual Analog Scale (VAS) ranging from 0 to 10.Results were analyzed statistically by Mann Whitney U and Wilcoxon tests. Results: There was no significant difference in the color change between the two groups (p> 0.05). No gingival sensitivity was reported during bleaching with diode laser. Bleaching with the use of diode laser showed significantly smaller gingival and teeth sensitivity scores (p< 0.05). Conclusions: Both of the techniques resulted in significant tooth lightening but bleaching with the use of diode laser resulted less gingival and teeth sensitivity.