Nguyen C, Augros C, Rocca J P, Lagori G, Fornaini C
Faculty of Dentistry, University of Nice Sophia Antipolis, Pôle Universitaire St Jean d'Angély 24, Avenue des Diables Bleus, 06357, Nice Cedex 4, France.
Dental School, Faculty of Medicine, University of Parma, Via Gramsci, 14, 43126, Parma, Italy.
Lasers Med Sci. 2015 Nov;30(8):2157-64. doi: 10.1007/s10103-015-1778-6. Epub 2015 Jun 23.
The aim of this study was to compare the results, in terms of temperature, colour change and morphology, of two different laser wavelengths with two different concentrations of hydrogen peroxide (HP). The lasers used were KTP (potassium-titanyl-phosphate) laser (λ = 532 nm (PD = 1.98 W/cm2)) and Er:YAG laser (λ = 2940 nm (PD = 2.54 W/cm2)). The bleaching gels used were PolaOffice 35% HP gel and PolaOffice+ 6% HP gel (SDI, Australia). Thirty-six extracted human teeth were selected and divided into two groups. For the 35% HP treatment, 18 teeth were randomly assigned to three subgroups: (1) HP gel without laser irradiation vs. HP gel + KTP laser irradiation; (2) HP gel without laser irradiation vs. HP gel + Er:YAG irradiation; and (3) HP gel + KTP laser irradiation vs. HP gel + Er:YAG irradiation. The same protocol was used for the 6% HP bleaching treatment. The bleaching results were analysed by a spectrophotometer, the thermal elevation by K thermocouples and the enamel surface by a scanning electron microscope (SEM). The Kruskal-Wallis test and the Mann-Whitney test were performed, and the data were analysed using the software StatView and the free Web statistics tool BiostaTGV. The thermal elevation of the Er:YAG groups was higher than KTP, while only the group 35% HP gel vs. 35% HP gel + Er:YAG showed significant colour differences (p < 0.05). SEM photographs showed slight enamel surface morphologic alterations after bleaching treatment. The Er:YAG laser may improve the bleaching results of 35% HP even if it increases the gel temperature, when compared to the KTP laser.
本研究的目的是比较两种不同激光波长与两种不同浓度过氧化氢（HP）在温度、颜色变化和形态方面的效果。所使用的激光为KTP（磷酸钛钾）激光（λ = 532 nm（功率密度PD = 1.98 W/cm²））和Er:YAG激光（λ = 2940 nm（PD = 2.54 W/cm²））。所使用的漂白凝胶为PolaOffice 35% HP凝胶和PolaOffice+ 6% HP凝胶（澳大利亚SDI公司）。选取36颗拔除的人类牙齿并分为两组。对于35% HP治疗，18颗牙齿被随机分配到三个亚组：（1）未进行激光照射的HP凝胶与HP凝胶 + KTP激光照射；（2）未进行激光照射的HP凝胶与HP凝胶 + Er:YAG照射；以及（3）HP凝胶 + KTP激光照射与HP凝胶 + Er:YAG照射。6% HP漂白治疗采用相同方案。通过分光光度计分析漂白结果，通过K热电偶分析温度升高情况，通过扫描电子显微镜（SEM）分析牙釉质表面情况。进行了Kruskal-Wallis检验和Mann-Whitney检验，并使用StatView软件和免费网络统计工具BiostaTGV对数据进行分析。Er:YAG组的温度升高高于KTP组，而仅35% HP凝胶组与35% HP凝胶 + Er:YAG组显示出显著的颜色差异（p < 0.05）。SEM照片显示漂白治疗后牙釉质表面有轻微形态改变。与KTP激光相比，Er:YAG激光可能会改善35% HP的漂白效果，即使它会使凝胶温度升高。
