Nihon University School of Dentistry, Department of Operative Dentistry, Tokyo, Japan.
J Adhes Dent. 2011 Jun;13(3):207-12. doi: 10.3290/j.jad.a19240.
Single-step self-etching adhesives have been developed as a bonding material that adheres to the tooth surface. The adhesives contain acidic resin monomers that penetrate the dentin but can be neutralized to stop the reaction. This study aimed to improve understanding of the pH changes that occur when self-etching adhesives are mixed with dentin powder.
Dentin disks obtained from extracted bovine incisors were milled and pulverized into a fine powder. The powder was mixed with diluted self-etching adhesives, and pH changes were measured by a solid-state pH sensor connected to a pH meter at various time points after the start of mixing. Data were analyzed by Tukey's Honestly Significant Difference (HSD) test and Dunnett's test at a significance level of 0.05. Precipitates from the adhesive/ dentin powder mixture were observed by scanning electron microscopy (SEM).
The baseline pH values of the self-etching adhesives ranged from 0.97 to 2.83. After mixing with the dentin powder, the pH values significantly increased, ranging from 6.30 to 7.11 at 180 s after mixing. SEM observation revealed products of the reaction between dentin powder and self-etching adhesive which indicate a chemical reaction between the functional monomer and dentin.
Dentin has a strong modulation effect against the acidity of self-etching adhesives.
一步法自酸蚀黏合剂作为一种黏接材料被开发出来，黏接材料可黏附于牙面。黏合剂中含有酸性树脂单体，这些单体可渗透牙本质，但可被中和以停止反应。本研究旨在更好地了解自酸蚀黏合剂与牙本质粉末混合时发生的 pH 值变化。
从牛切牙中提取的牙本质圆盘被研磨并粉碎成细粉。将粉末与稀释的自酸蚀黏合剂混合，通过与 pH 计相连的固态 pH 传感器在混合开始后的不同时间点测量 pH 值变化。使用 Tukey 的Honestly Significant Difference (HSD) 检验和 Dunnett 的检验在 0.05 的显著性水平下分析数据。通过扫描电子显微镜 (SEM) 观察黏合剂/牙本质粉末混合物中的沉淀物。
自酸蚀黏合剂的基线 pH 值范围为 0.97 至 2.83。与牙本质粉末混合后，pH 值显著升高，混合 180 s 后范围为 6.30 至 7.11。SEM 观察显示牙本质粉末与自酸蚀黏合剂之间的反应产物表明功能性单体与牙本质之间发生了化学反应。
牙本质对自酸蚀黏合剂的酸度具有很强的调节作用。
