Pahlavan A, Dennison J B, Charbeneau G T
J Am Dent Assoc. 1976 Dec;93(6):1170-6. doi: 10.14219/jada.archive.1976.0287.
In this investigation, the penetration of different resins into the etched enamel surface and the effect of their viscosity on the penetration of these materials were studied. Freshly extracted teeth were pumiced, rinsed, and dried. The enamel surface was etched by using a solution containing 50% phosphoric acid for one minute; in one group the teeth were etched for two minutes. A layer of enamel surface of another group of teeth was removed before etching; these teeth were etched for one minute. Three different resins--Nuva-Seal, Concise Enamel Bind, and Restodent--were applied to the acid-etched enamel surface for one minute. The Concise composite resin also was applied to the enamel surface of a group of teeth etched for the same period of time. Observations with SEM and polarized light microscopy showed penetration of all the materials into the etched enamel surface to be 5 mum to 10 mum, with a mean of 7 mum. There was no difference in the penetration of these materials despite their different viscosities. The removal of a layer from the enamel surface was not effective in the penetration of the materials.
在本研究中，研究了不同树脂渗入酸蚀釉质表面的情况以及它们的粘度对这些材料渗入的影响。刚拔除的牙齿经浮石处理、冲洗并干燥。使用含50%磷酸的溶液蚀刻釉质表面1分钟；一组牙齿蚀刻2分钟。另一组牙齿在蚀刻前去除一层釉质表面；这些牙齿蚀刻1分钟。将三种不同的树脂——Nuva-Seal、Concise Enamel Bind和Restodent——涂覆在酸蚀釉质表面1分钟。Concise复合树脂也涂覆在蚀刻相同时间的一组牙齿的釉质表面。扫描电子显微镜和偏光显微镜观察显示，所有材料渗入酸蚀釉质表面的深度为5μm至10μm，平均为7μm。尽管这些材料的粘度不同，但它们的渗入情况没有差异。从釉质表面去除一层对材料的渗入没有效果。
