Asmussen E
Acta Odontol Scand. 1977;35(4):175-82. doi: 10.3109/00016357709004652.
It has been a controversial question whether an intermediate layer of low-viscous, non-composite resin between composite restorative and etched enamel is beneficial. It was the purpose of the present work to investigate some of the factors that govern the penetration of resins into the capillary pores of etched enamel surfaces. Viscosity, surface tension and contact angle on human enamel were measured using monomer mixtures similar to those found in commercial restorative resins. Employing a cylindrical model of relevant dimensions of the capillary pores, and on the basis of Poiseuille's equation the time of penetration was calculated for a relatively high-viscous and a relatively low-viscous monomer mixture. It was concluded that viscosity as such is not a limiting factor for the penetration of restorative resin monomers into the pores of etched enamel surfaces.
复合修复体与酸蚀釉质之间的低粘性、非复合树脂中间层是否有益一直是个有争议的问题。本研究的目的是探讨一些控制树脂渗入酸蚀釉质表面毛细孔的因素。使用类似于商业修复树脂中的单体混合物，测量了其在人牙釉质上的粘度、表面张力和接触角。采用具有相关毛细孔尺寸的圆柱形模型，并根据泊肃叶方程计算了相对高粘性和相对低粘性单体混合物的渗透时间。得出的结论是，粘度本身并不是修复树脂单体渗入酸蚀釉质表面孔隙的限制因素。
