Guanaes Brunna Katyuscia de Almeida, Duarte Talyta Neves, Correr Gisele Maria, Kaizer Marina da Rosa, Gonzaga Carla Castiglia
School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Curitiba, PR, Brazil.
Restor Dent Endod. 2022 Feb 3;47(1):e7. doi: 10.5395/rde.2022.47.e7. eCollection 2022 Feb.
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.
Bovine incisors were distributed in 4 groups ( = 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 , Δ and Δ . 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 -test (α = 5%).
VL exhibited lower color ( and Δ ) and whiteness changes (Δ ) than the other groups. HPVL presented higher color change values than HYB. HYB and HPVL showed not different Δ 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).
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.
本研究评估了与紫光发光二极管（V-LED）相关的不同诊室漂白方案的漂白效果，并测量了使用或不使用凝胶时V-LED引起的牙髓温度升高。
牛切牙分为4组（每组n = 10）：VL - V-LED组；HP - 35%过氧化氢组（对照组）；HYB - 混合方案组，先在不使用凝胶的情况下用V-LED照射10个周期，然后在使用凝胶的情况下再用V-LED照射10个周期；HPVL - 使用凝胶和V-LED照射20个周期。每隔7天进行3次漂白疗程。用明度、ΔE和ΔL*评估漂白效果。在基线、7天、14天、21天和70天记录数据。对于牙髓温度升高，将热电偶置于人切牙的髓腔内。为了确定髓腔内温度，在使用或不使用漂白凝胶的情况下用V-LED照射牙齿。色差数据采用双向重复测量方差分析和Tukey检验进行分析。牙髓温度采用t检验分析（α = 5%）。
VL组的颜色变化（明度和ΔE）和白度变化（ΔL*）低于其他组。HPVL组的颜色变化值高于HYB组。HYB组和HPVL组的ΔL*值无差异；HP组在所有时间的白度变化最高。使用凝胶时（8.9°C）和不使用凝胶时（7.2°C）的ΔT比较有显著差异。
HPLV比HYB更有效。两种使用VL的方案与对照组结果相似。与不使用凝胶组相比，使用凝胶结合VL会使牙髓温度升高更高。
