Bhutani Neha, Venigalla Bhuvan Shome, Patil Jaya Prakash, Singh Thakur Veerandar, Jyotsna Sistla Venkata, Jain Abhilasha
Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery, Vikarabad, Telangana, India.
J Conserv Dent. 2016 May-Jun;19(3):259-63. doi: 10.4103/0972-0707.181944.
The aim of this in vitro study is to evaluate the role of light and laser sources in the bleaching ability of 37.5% H2 O2 on extracted human teeth.
About 30 caries-free single-rooted maxillary central incisors were used for the study. Specimens were prepared by sectioning the crown portion of teeth mesiodistally, and labial surface was used for the study. Specimens were then immersed in coffee solution for staining. Color of each tooth was analyzed using Shadestar, a digital shademeter. Specimens were then divided into three groups of 10 each and were subjected to bleaching with 37.5% H2 O2, 37.5% H2 O2 + light activation, and 37.5% H2 O2 + laser activation, respectively. Postbleaching, the color was analyzed for all the specimens immediately and then after 1, 2, and 3 weeks intervals, respectively.
All the statistical analyses were done using SPSS version 17. Intra- and inter-group comparisons were done with Friedman test and Kruskal-Wallis ANOVA, respectively. Statistical analysis concluded with a significant improvement in their shade values from baseline in all the three groups. Halogen light activation and laser-activated groups showed comparatively enhanced bleaching results over no-activation group, though the difference was not statistically significant.
The results of the present study show that bleaching assisted with halogen light and laser showed increased lightness than nonlight activated group. Durability of bleaching results obtained postbleaching was maintained throughout the experimental trail period of 3 weeks for both halogen light and laser activation group, whereas no-light activation group presented with shade rebound after 2 weeks postbleaching.
本体外研究的目的是评估光和激光源在37.5%过氧化氢对拔除的人牙漂白能力中的作用。
本研究使用了约30颗无龋的单根上颌中切牙。通过将牙齿冠部近远中向切片制备标本，并使用唇面进行研究。然后将标本浸入咖啡溶液中进行染色。使用数字比色仪Shadestar分析每颗牙齿的颜色。然后将标本分为三组，每组10个，分别用37.5%过氧化氢、37.5%过氧化氢+光激活和37.5%过氧化氢+激光激活进行漂白。漂白后，立即对所有标本进行颜色分析，然后分别在1、2和3周后进行分析。
所有统计分析均使用SPSS 17版进行。组内和组间比较分别使用Friedman检验和Kruskal-Wallis方差分析。统计分析得出，三组的明度值均较基线有显著改善。卤素光激活组和激光激活组的漂白效果比未激活组相对增强，尽管差异无统计学意义。
本研究结果表明，与未用光激活的组相比，卤素光和激光辅助漂白显示出更高的明度。对于卤素光和激光激活组，在整个3周实验期内，漂白后获得的漂白效果的耐久性得以维持，而未用光激活组在漂白后2周出现颜色反弹。
