Former student, Operative Dentistry, Department of Dentistry, Federal University of Santa Catarina, Santa Catarina, Brazil.
Former student, Operative Dentistry, Department of Dentistry, Federal University of Santa Catarina, Santa Catarina, Brazil.
J Prosthet Dent. 2018 Jan;119(1):53-59. doi: 10.1016/j.prosdent.2017.03.004. Epub 2017 May 5.
Controlled clinical trials comparing the effectiveness of the walking bleaching (WB) technique and the inside-outside (I-O) technique used in a short daily regimen are lacking.
The purpose of this randomized clinical trial was to investigate the effectiveness of WB with that of the I-O technique conducted over 4 weeks and to compare color changes after 1 year.
Discolored and endodontically treated anterior teeth received a cervical seal and were randomly divided into groups according to the technique. In the WB group (n=9), a mixture of sodium perborate and 20% hydrogen peroxide was applied in the pulp chambers and replaced weekly up to 4 weeks. For the I-O group (n=8), participants applied 10% carbamide peroxide in the pulp chambers and wore custom-fitted trays for 1 hour per day over 4 weeks. CIELab parameters were obtained using a spectrophotometer at baseline, during bleaching (1, 2, 3, and 4 weeks) and after 1 year. Changes in color (ΔE), lightness (ΔL*), green-red axis (Δa*), blue-yellow axis (Δb*), and absolute color parameters (L*, b*, and a*) for each evaluation time were calculated and analyzed by repeated measures analysis of variance (ANOVA) and post hoc Bonferroni test (α=.05).
No significant differences between WB and I-O techniques were observed for ΔE, ΔL*, Δa*, Δb*, L*, a*, or b* values (P>.05); however, significant differences were observed among the evaluation times (P<.05). Color changes observed after 2 weeks were stable after 1 year; ΔL* and Δa* values after 1 year were not significantly different from the 1-week evaluation, and significant changes in Δb* after 3 weeks were maintained at the 1-year follow-up. The same trend was observed for the absolute CIELab color parameters.
Both WB and I-O regimens were similarly effective as shown by significant ΔE after 2 weeks and no color regression after 1 year.
缺乏比较行走漂白（WB）技术和内部-外部（I-O）技术在短期日常方案中的有效性的对照临床试验。
本随机临床试验的目的是研究 WB 技术与 I-O 技术在 4 周内的有效性，并比较 1 年后的颜色变化。
变色和牙髓治疗的前牙接受颈部密封，并根据技术随机分为两组。在 WB 组（n=9）中，将过硼酸钠和 20%过氧化氢的混合物应用于牙髓室中，每周更换一次，持续 4 周。对于 I-O 组（n=8），参与者在牙髓室中应用 10%的脲酶，并在 4 周内每天佩戴定制托盘 1 小时。使用分光光度计在基线、漂白期间（第 1、2、3 和 4 周）和 1 年后获得 CIELab 参数。计算并通过重复测量方差分析（ANOVA）和事后 Bonferroni 检验（α=.05）分析每个评估时间的颜色变化（ΔE）、明度（ΔL*）、绿-红轴（Δa*）、蓝-黄轴（Δb*）和绝对颜色参数（L*、b和 a）。
WB 和 I-O 技术之间在 ΔE、ΔL*、Δa*、Δb*、L*、a或 b值方面没有观察到显著差异（P>.05）；然而，在评估时间之间观察到显著差异（P<.05）。第 2 周观察到的颜色变化在 1 年后保持稳定；1 年后的 ΔL和 Δa值与第 1 周评估无显著差异，第 3 周后 Δb*的显著变化在 1 年随访时保持不变。CIELab 颜色参数的绝对值也呈现出相同的趋势。
WB 和 I-O 方案在第 2 周后有显著的 ΔE，并且在 1 年后没有颜色消退，因此效果相似。
