Restor Dent Endod.  2022 Feb;47(1):e7. 10.5395/rde.2022.47.e7.

In-office dental bleaching with violet light emitting diode: bleaching efficacy and pulpal temperature rise

• Guanaes BKdA
• Duarte TN
• Correr GM
• Kaizer MdR
• Gonzaga CC

• KMID: 2548116
• DOI: http://doi.org/10.5395/rde.2022.47.e7

Abstract

Objectives
This study evaluated the bleaching efficacy of different in-office protocols associated with violet light emitting diode (V-LED), and measured the pulpal temperature rise caused by V-LED with or without gel application.
Materials and Methods
Bovine incisors were distributed in 4 groups (n = 10): VL – V-LED; HP – 35% hydrogen peroxide (control); HYB – hybrid protocol, V-LED applied without gel for 10 irradiation cycles followed by V-LED applied with gel for another 10 irradiation cycles; and HPVL – gel and V-LED applied for 20 irradiation cycles. Three bleaching sessions were performed with 7-day intervals.Bleaching efficacy was evaluated with ΔE^*_ab , ΔE₀₀ and ΔWID. Data were recorded at baseline, 7, 14, 21 and 70 days. For pulpal temperature rise, thermocouples were placed inside the pulp chamber of human incisors. To determine intrapulpal temperature, the teeth were irradiated with V-LED with or without application of bleaching gel. Color difference data were analyzed by 2-way repeated measures ANOVA and Tukey’s test. Pulpal temperature was analyzed by t-test (α = 5%).
Results
VL exhibited lower color (ΔE^*_ab and ΔE₀₀) and whiteness changes (ΔWI_D) than the other groups. HPVL presented higher color change values than HYB. HYB and HPVL showed not different ΔWI_D values; and HP showed the highest whiteness changes at all times. There were significant differences comparing ΔT with gel (8.9°C) and without gel application (7.2°C).
Conclusions
HPLV was more efficient than HYB. The 2 protocols with VL showed similar results to control. Gel application combined with VL promoted higher pulpal temperature than to the no gel group.

Keyword

Color; Hydrogen peroxide; Light; Temperature; Tooth bleaching; Tooth bleaching agents

Figure

• 

  Figure 1 ΔEab-PREVIOUS*, ΔE00-PREVIOUS and ΔWID-PREVIOUS showing the bleaching efficiency classification for the follow-up times in relation to the immediately previous time for the evaluated groups.VL, violet light emitting diode (V-LED); HP, 35% hydrogen peroxide; HYB, hybrid protocol, V-LED applied without gel for 10 irradiation cycles followed by V-LED applied with gel for another 10 irradiation cycles; HPVL, hydrogen peroxide and V-LED applied in 20 irradiation cycles.

• 

  Figure 2 L*, a* and b* coordinates for the evaluated groups and follow-up times. One should note that the a* values are negative and the x-axis is set at −3.VL, violet light emitting diode (V-LED); HP, 35% hydrogen peroxide; HYB, hybrid protocol, V-LED applied without gel for 10 irradiation cycles followed by V-LED applied with gel for another 10 irradiation cycles; HPVL, hydrogen peroxide and V-LED applied in 20 irradiation cycles.

• 

  Figure 3 Data for pulpal temperature and temperature variation with without and the application of the bleaching gel. For both parameters, values followed by the same letters are statistically similar (p > 0.05).SD, standard deviation.

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