Department of Operative Dentistry and Periodontology, University Medical Center Freiburg, Dental School and Hospital, Freiburg, Germany.
Oper Dent. 2013 Jan-Feb;38(1):21-32. doi: 10.2341/12-041-C. Epub 2012 Jul 7.
The aim of this study was to evaluate the color stability of vital bleaching using a halogen unit, laser, or only chemical activation up to three months after treatment. A total of 60 patients were divided into three groups, and their teeth were bleached with 38% hydrogen peroxide using three methods: acceleration of the bleaching process with halogen (eight minutes), laser (30 seconds), or chemical activation only. All teeth were bleached a maximum of four times (4 × 15 minutes) until a change of six shade tabs took place. The color was evaluated both visually and with a spectrophotometer before bleaching, immediately after bleaching, and one and three months after bleaching. Directly after bleaching, the use of halogen showed better results than laser (p≤0.05). One and three months after bleaching, no significant difference was found between the tested methods relative to the shade change, independent of the method of shade evaluation (p>0.05). As far as the color stability is concerned, bleaching with halogen resulted in stable color throughout the three months (p>0.05), whereas the other two methods resulted in whiter teeth after one and three months compared with the color directly after bleaching (p≤0.05). Bleaching with laser needed more time than halogen for the desired shade change (p≤0.05). Although directly after treatment bleaching with halogen resulted in better results, one and three months after bleaching the kind of acceleration used in the bleaching process did not have any effect on the esthetic results.
本研究旨在评估使用卤素灯、激光或仅通过化学激活对活髓牙漂白后长达三个月的颜色稳定性。共有 60 名患者被分为三组，分别使用三种方法用 38%过氧化氢对牙齿进行漂白：用卤素灯（八分钟）加速漂白过程、激光（30 秒）或仅通过化学激活。所有牙齿最多漂白 4 次（4×15 分钟），直到颜色变化达到 6 个色阶。在漂白前、漂白后立即以及漂白后 1 个月和 3 个月，分别通过肉眼观察和分光光度计评估颜色。漂白后立即，使用卤素灯的效果优于激光（p≤0.05）。漂白后 1 个月和 3 个月，无论采用何种比色方法，三种方法的色差值均无显著差异（p>0.05）。就颜色稳定性而言，在三个月内，使用卤素灯的颜色保持稳定（p>0.05），而其他两种方法在 1 个月和 3 个月后，与漂白后立即的颜色相比，牙齿变得更白（p≤0.05）。激光漂白所需时间比卤素灯长，才能达到所需的色阶变化（p≤0.05）。尽管在治疗后立即使用卤素灯的效果更好，但在漂白后 1 个月和 3 个月，漂白过程中使用的加速方式对美观效果没有影响。
