Maeda T, Yamaguchi K, Takamizawa T, Rikuta A, Tsubota K, Ando S, Miyazaki M
Nihon University School of Dentistry, Department of Operative Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-Ku, Tokyo, Japan.
J Dent. 2008 Aug;36(8):606-10. doi: 10.1016/j.jdent.2008.04.009. Epub 2008 May 22.
The purpose of this study was to examine the pH changes of self-etching primers mixed with dentine powder.
Four self-etching primer adhesive systems were used: Clearfil SE Bond, Imperva Fluoro Bond, Mac Bond II, and Unifil Bond. Dentine discs obtained from extracted bovine incisors were milled and pulverized into a fine powder. The dentine powder was then mixed with solutions of self-etching primers diluted with distilled water. The pH changes of the primer-dentine powder mixtures were measured by a solid-state pH sensor connected to a pH meter at time points 10, 20, 30, 60, 120, 180, 300, and 600 s after the start of mixing. Data were analyzed by the Tukey HSD test and the Dunnett test at a significance level of 0.05.
The baseline pH values of the self-etching primers ranged from 1.83 to 2.34, with Mac Bond II exhibiting a significantly lower value than the other three products. After mixing with the dentine powder, the pH values significantly increased, ranging from 6.95 to 7.37 at 600 s after mixing; there were no significant differences in these values among the self-etching primers used. An insoluble precipitate was formed in the case of Clearfil SE Bond, indicating a chemical reaction between the functional monomer and the dentine powder.
The dentine has a strong buffering capacity against the acidity of self-etching primers.
本研究旨在检测自酸蚀底漆与牙本质粉末混合后的pH值变化。
使用四种自酸蚀底漆粘结系统：Clearfil SE Bond、Imperva Fluoro Bond、Mac Bond II和Unifil Bond。将从拔除的牛切牙获得的牙本质盘研磨并粉碎成细粉。然后将牙本质粉末与用蒸馏水稀释的自酸蚀底漆溶液混合。在混合开始后的10、20、30、60、120、180、300和600秒时间点，通过连接到pH计的固态pH传感器测量底漆 - 牙本质粉末混合物的pH值变化。数据采用Tukey HSD检验和Dunnett检验进行分析，显著性水平为0.05。
自酸蚀底漆的基线pH值范围为1.83至2.34，其中Mac Bond II的值显著低于其他三种产品。与牙本质粉末混合后，pH值显著升高，混合后600秒时范围为6.95至7.37；所用自酸蚀底漆之间的这些值没有显著差异。Clearfil SE Bond的情况下形成了不溶性沉淀，表明功能单体与牙本质粉末之间发生了化学反应。
牙本质对自酸蚀底漆的酸性具有很强的缓冲能力。
