de Paula Eloisa Andrade, Nava Jéssica Andressa, Rosso Cheilla, Benazzi Cristina Monteiro, Fernandes Karen Tamura, Kossatz Stella, Loguercio Alessandro Dourado, Reis Alessandra
School of Dentistry, Paranaense University, Umuarama, Paraná, Brazil.
School of Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil.
J Dent. 2015 Apr;43(4):424-9. doi: 10.1016/j.jdent.2014.09.009. Epub 2014 Sep 23.
In-office bleaching is usually performed in 2-3 sessions with one-week interval. The impact of shorter interval times on tooth sensitivity has not been evaluated. This study aimed to compare the absolute risk of tooth sensitivity (TS) and colour change after in-office bleaching with a two- and seven-day intervals between sessions.
We selected for this randomized, single-blind study, 40 patients with colour C2 or darker. We performed two bleaching sessions with a 35% hydrogen peroxide gel with either a 1-week or 2-day interval. We recorded the TS up to 48 h with a VAS scale and the colour at baseline and 30 days after bleaching with a value-oriented shade guide and a spectrophotometer. The risk and intensity of TS were compared with the Fisher's exact test and two-way repeated measures ANOVA. Colour change (ΔSGU and ΔE) were evaluated by Student's t-test (alpha=5%).
Approximately 60% of the participants reported TS (65% and 55% for the 7 and 2-day groups). A significant whitening of approximately 6 shade guide units was detected for both groups. No difference was detected between groups.
The reduction of the interval between bleaching sessions from seven to two days reduced the treatment time without increasing the bleaching-induced TS (clinicaltrials.gov identifier: NCT1959789).
In-office bleaching with a 2-day interval did not increase the risk and intensity of bleaching-induced tooth sensitivity.
诊室漂白通常分2至3次进行，间隔为一周。较短间隔时间对牙齿敏感的影响尚未得到评估。本研究旨在比较诊室漂白 sessions 间隔为两天和七天时牙齿敏感（TS）的绝对风险以及颜色变化。
我们为这项随机、单盲研究选择了40名C2或更深颜色的患者。我们使用35%的过氧化氢凝胶进行了两次漂白 sessions，间隔为1周或2天。我们使用视觉模拟量表（VAS）记录了长达48小时的TS，并使用以数值为导向的比色板和分光光度计记录了基线时以及漂白后30天的颜色。TS的风险和强度通过Fisher精确检验和双向重复测量方差分析进行比较。颜色变化（ΔSGU和ΔE）通过学生t检验进行评估（α = 5%）。
大约60%的参与者报告有TS（7天组和2天组分别为65%和55%）。两组均检测到约6个比色板单位的显著增白。两组之间未检测到差异。
将漂白 sessions 之间的间隔从7天缩短至2天可缩短治疗时间，而不会增加漂白引起的TS（clinicaltrials.gov标识符：NCT1959789）。
间隔2天的诊室漂白不会增加漂白引起的牙齿敏感的风险和强度。
