Aust Dent J. 2014 Mar;59(1):37-42. doi: 10.1111/adj.12150.
The wettability of a surface is a prerequisite for adhesion and the type of dentine plays an important role in this property. This study evaluated the effect of different excipients of chlorhexidine (CHX) on sound and caries-affected dentine wettability.
Flat dentine surfaces were prepared (n = 100) and artificial caries was induced in half of the sample. For each substrate, sound and caries-affected dentine, surfaces were assigned to five groups: (1) smear-covered dentine; (2) smear-free dentine saturated with water; (3) ethanol; (4) 1% CHX in water; or (5) 1% chlorhexidine in ethanol. The infected dentine was ground with 320-grit silicon carbide paper to the level of affected dentine. The smear layer was removed with acid, followed by rinsing, blot drying and the application of each solution (60 seconds). Single Bond 2 was applied to each surface and contact angles were measured using a goniometer. Data were analysed by ANOVA and Student–Newman–Keuls (a = 0.05).
Contact angles were higher on sound dentine, regardless of the treatment. For sound and caries-affected dentine significantly higher angles were obtained on smear-covered dentine. Acid-etched dentine saturated with ethanol and ethanol/CHX resulted in significantly lower angles but only for sound dentine. Neither water and water/CHX nor ethanol and ethanol/CHX solutions differ with respect to dentine wettability.
Caries-affected dentine wettability is higher than sound dentine, and chlorhexidine does not influence this property.
表面的润湿性是黏附的前提，牙本质的类型在此性质中起着重要作用。本研究评估了不同洗必泰（CHX）赋形剂对健康和龋损牙本质润湿性的影响。
制备平坦的牙本质表面（n=100），并在样本的一半中诱导人工龋。对于每个基底，健康和龋损牙本质的表面分为五组：（1）覆盖有玷污层的牙本质；（2）用纯水饱和的无玷污层牙本质；（3）乙醇；（4）纯水 1% CHX；或（5）乙醇 1% CHX。将感染牙本质用 320 目碳化硅砂纸磨至受感染牙本质的水平。用酸去除玷污层，然后冲洗、吸干并应用每种溶液（60 秒）。将每种溶液应用于每个表面，并使用接触角测量仪测量接触角。使用方差分析和 Student–Newman–Keuls（a=0.05）进行数据分析。
无论处理方式如何，健康牙本质的接触角均较高。对于健康和龋损牙本质，覆盖有玷污层的牙本质的角度明显更高。用乙醇饱和的酸蚀刻牙本质和乙醇/CHX 导致角度显著降低，但仅适用于健康牙本质。水和水/CHX 以及乙醇和乙醇/CHX 溶液在牙本质润湿性方面没有差异。
龋损牙本质的润湿性高于健康牙本质，且洗必泰不影响该特性。
