Saeedi Reza, Omrani Ladan Ranjbar, Abbasi Mahdi, Chiniforush Nasim, Kargar Mojgan
Department of Operative Dentistry, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Front Dent. 2019 Nov-Dec;16(6):458-464. doi: 10.18502/fid.v16i6.3445. Epub 2019 Dec 20.
Light irradiation and heat have been used to accelerate the process of tooth bleaching. This study aimed to assess the efficacy of conventional bleaching compared to laser-bleaching using three different wavelengths of diode lasers.
In this in-vitro experimental study, 40 extracted human central incisors were immersed in a coloring solution made of tea, coffee, and cola for 21 days. The L*, a*, and b* color parameters were measured before and after the immersion using spectrophotometry. The teeth were then randomly divided into four groups (n=10) as follows: group 1: 810-nm diode laser + Biolase Laser White 20, group 2: 940-nm diode laser + Biolase Laser White 20, group 3: 980-nm diode laser + Biolase Laser White 20, and group 4: conventional bleaching with Opalescence Boost without laser irradiation. One-way analysis of variance (ANOVA) was used to assess the effect of laser type and bleaching technique on color parameters.
The 940-nm (ΔE=28.5896) and 810-nm laser groups (ΔE=21.2382) showed the highest and the lowest bleaching efficacy, respectively; however, the groups were not significantly different in terms of bleaching efficacy (P>0.05).
Laser-bleaching with 810-, 940- and 980-nm wavelengths of diode laser has an efficacy similar to that of conventional bleaching but in a shorter period. No difference was noted between different laser wavelengths in terms of bleaching efficacy.
光照射和加热已被用于加速牙齿漂白过程。本研究旨在评估与使用三种不同波长二极管激光的激光漂白相比，传统漂白的效果。
在这项体外实验研究中，40颗拔除的人正中切牙浸泡在由茶、咖啡和可乐制成的染色溶液中21天。使用分光光度法在浸泡前后测量L*、a和b颜色参数。然后将牙齿随机分为四组（n = 10），如下：第1组：810纳米二极管激光+Biolase Laser White 20；第2组：940纳米二极管激光+Biolase Laser White 20；第3组：980纳米二极管激光+Biolase Laser White 20；第4组：使用Opalescence Boost进行传统漂白，不进行激光照射。采用单因素方差分析（ANOVA）来评估激光类型和漂白技术对颜色参数的影响。
940纳米组（ΔE = 28.5896）和810纳米激光组（ΔE = 21.2382）分别显示出最高和最低的漂白效果；然而，两组在漂白效果方面无显著差异（P>0.05）。
使用810、940和980纳米波长二极管激光的激光漂白效果与传统漂白相似，但所需时间更短。不同激光波长在漂白效果方面未发现差异。
