ESTUDO CLÍNICO RANDOMIZADO DO EFEITO DO LASER TERAPÊUTICO NO CONTROLE DA SENSIBILIDADE DENTAL DURANTE E APÓS CLAREAMENTO DE CONSULTÓRIO

Abstract

This study determined the effect of therapeutic laser, visible red and infrared present or not in the hybrid LED / Laser source in activation of the gel and the control of tooth sensitivity caused by in-office bleaching activated by LED light. A randomized, blinded , split-mouth was carried out in four groups (n = 16): Group LED ( GL), Group LED / low power infrared Laser ( GLL) , Group LED + infrared Laser therapy ( GLIV) and group LED + red Laser therapy ( GLVV) . Each volunteer had their upper and lower arches bleached with hydrogen peroxide to 35 % following the manufacturer's recommendations, however, with different treatments to sensitivity with an interval of 1 week between bleaching sessions and 15 days between treatments of the arcades. Tooth sensitivity was recorded in three scales: visual analog (VAS), a 5-point verbal rating scale (VRS), and the 101 points scale (NRS). The susceptibility sensitivity dates were collected during each session, immediately after the end of the sessions, up to 12 h , 24 h , 48 h , 1 month and 6 months. The color evaluation was performed before and after each treatment session and at 1 month and 6 months after bleaching with color scale (Vita Classical). Tooth sensitivity was compared between groups at each time with the Kruskal-Wallis test. The sensitivity in the same group in different periods were analyzed using the Friedman test and pair comparison with Wilcoxon. The intensity of sensitivity was similar for all groups at different times, with no statistical difference between them (p>0,05). The laser sources present in the hybrid LED / Laser was not able to prevent or reduce the dental sensitivity and not to improve the effectiveness of bleaching. The therapeutic lasers infrared and red applied after bleaching sessions also not able to prevent nor reduce tooth sensitivity caused by bleaching. All groups had their teeth whitened after 2 sessions and the color remained in assessments 1 month and 6 months.