Clinical Investigation of 940 nm Diode Laser Power Bleaching: An in Vivo Study

Introduction: the increased demand by patient to whiten their teeth in short time had made in- office bleaching procedure the common one. the accompanying tooth sensitivity remains an important factor affecting patients physically and psychologically. the aim of this in vivo study was to observe the effectiveness of 940 nm diode laser in combination with bleaching gel by analyzing tooth sensitivity and colour change. methods: fourteen patients treated by laser-assisted bleaching using diode laser at 940 nm and bleaching gel containing 38% hydrogen peroxide. tooth sensitivity recorded during and after treatment at 6 hours and 1 day using visual analogue scale (vas). tooth shade had recorded before and after bleaching using vita classical brightness scale. results: patients whom did not experienced pain during and after the treatment were 78.60% and 92.90%, respectively. tooth brightness change after treatment was statistically different (p = 0.001). conclusion: diode laser of 940 nm is an effective adjunctive tool for reducing tooth sensitivity originated from high concentration h2o2 bleaching gel.