Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
Department of Restorative Dentistry, University of Washington School of Dentistry.
Dent Mater J. 2021 May 29;40(3):566-572. doi: 10.4012/dmj.2020-191. Epub 2021 Jan 15.
This study investigated the effect of pH of bleaching agent, photo-irradiation time or application times on bleaching action using hematoporphyrin-stained papers (HSPs) and artificially stained bovine-teeth (BT). 23% H2O2 with pH 5.5, 6.0, 7.0, 8.0 and 9.0 were applied on the specimens. HSP was photo-irradiated for 1, 3 and 5 min. BT were photo-irradiated for 10 min and the bleaching was repeated ten times (n=10). CIE Lab* of the specimens were measured before and after the procedure. Data were analyzed by repeated-measures ANOVA followed by multiple comparisons with Bonferroni correction. For the HSP, longer irradiation time and higher pH yielded significantly higher color difference (ΔE). As for BT, increasing application times and higher pH resulted in higher ΔE. It was concluded that the pH of the bleaching agent significantly improved the bleaching effect with increased photo-irradiation time for HSP and with an increase of repeated application times for BT.
本研究使用血卟啉染色纸（HSP）和人工染色牛牙（BT），考察了漂白剂 pH 值、光辐照时间或应用次数对漂白作用的影响。将 pH 值分别为 5.5、6.0、7.0、8.0 和 9.0 的 23% H2O2 应用于标本上。对 HSP 进行 1、3 和 5 分钟的光辐照，对 BT 进行 10 分钟的光辐照，并且重复漂白十次（n=10）。在处理前后测量标本的 CIE Lab*值。采用重复测量方差分析，并用 Bonferroni 校正进行多重比较来分析数据。对于 HSP，较长的辐照时间和较高的 pH 值导致了显著更高的色差（ΔE）。对于 BT，增加应用次数和较高的 pH 值导致了更高的 ΔE。结论是，漂白剂的 pH 值显著提高了 HSP 中光辐照时间增加以及 BT 中重复应用次数增加的漂白效果。
