Vital Teeth Bleaching With Light source Activation: 36 Month Follow-up

Method: Twenty patients were selected and randomized for in-office bleaching, in which ten patients received the following 2 whitening protocols. G1A left side: 3x15' applications (totaling 45') of 35% hydrogen peroxide gel (HP) (Lase Peroxide Sensy, DMC Equipmentos Ltda.); G1B right side: 3x7'30" applications (22'30") of 35% HP gel with 3x2' hybrid light activation (HL) (LED/Laser Diode, Whitening Lase II, DMC Equipmentos Ltda.), with a 30” interval. The remaining 10 patients received the following two whitening protocols: G2A left side: 3x15' applications (45') of 35% HP (Whiteness HP Maxx, FGM); G2B right side: 3x7'30" applications (22'30") of 25% HP gel with 3x2' HL activation, with a 30” interval. A VAS questionnaire was used to evaluate tooth sensitivity before, immediately following, 24 h and 1 week after treatment. The color evaluation was performed with the Vita Easyshade (VITA) spectrophotometer after 24 hours, 1, 12 and 36 months. 

Result: Kruskal-Wallis (p<0.05) and the Mann Whitney tests (p<0.05) revealed differences between the groups for sensitivity (p=0.0314). The G1A and G2A groups without HL showed the highest sensitivity after 24 h. Two-way ANOVA and Tukey’s tests (p<0.05) revealed no statistically significant intra-group color differences in the times evaluated. The G1A (F=18.28) and G2A (F=7.22) groups presented significant color differences in relation to G1B and G2B groups for the 1, 12 and 36 month evaluations.

Conclusion: The groups with HL activation presented less sensitivity. The G1B group with 35% HP activation with HL source showed a lower color variation (DE) when compared to the other groups, and presented the same whitening effect but in half the time and better color stability over 36 months. (FAPESP: 2012/13331-2)