Morge S, Adamczak E, Lindén L A
Department of Technology, Dental Faculty, Karolinska Institute, Huddinge, Sweden.
Arch Oral Biol. 1989;34(8):669-74. doi: 10.1016/0003-9969(89)90023-x.
Contact angle measurements were used to study the effects of pellicle formation on polymethyl-methacrylate, dental amalgam and gold. Samples were exposed to saliva in vivo for periods of 5-20 min at three separate occasions during the day. Pellicle drastically increased the wettability of all the materials and effectively sealed off the effect of the original surface activity. Variation in pellicle formation during the day was demonstrated. Pellicles formed at midday showed the least reduction in contact angles compared to those formed during the morning and afternoon. This difference coincided with an increased concentration of inorganic phosphate in saliva at midday. The method enables comparative studies of pellicle formation on hard biosurfaces. The findings indicate differences in the physical behaviour of saliva during the day, and illustrate the importance of making adhesion studies with this variation in mind.
通过测量接触角来研究获得性膜形成对聚甲基丙烯酸甲酯、牙科汞合金和金的影响。白天分三次将样品在体内暴露于唾液中5 - 20分钟。获得性膜显著提高了所有材料的润湿性，并有效消除了原始表面活性的影响。结果表明白天获得性膜的形成存在差异。与上午和下午形成的获得性膜相比，中午形成的获得性膜接触角减小最少。这种差异与中午唾液中无机磷酸盐浓度增加相一致。该方法能够对硬生物表面上获得性膜的形成进行比较研究。研究结果表明白天唾液的物理行为存在差异，并说明了在进行粘附研究时考虑这种差异的重要性。
