Asmussen E
Acta Odontol Scand. 1977;35(4):183-91. doi: 10.3109/00016357709004653.
Viscosity, surface tension and contact angle are factors that influence the penetration of restorative resins into acid etched enamel. Furthermore, as the resin is drawn by the capillary forces into the pores of the etched enamel the pressure of the entrapped air will increase. The increased pressure has the effect that air will dissolve in a resin that is saturated with air at one atmosphere. The purpose of the present work was 1) to investigate the rate of dissolution of included air bubbles at increased pressure, 2) to use the results to calculate the depth of penetration by means of a cylindrical model of the capillary pores, and 3) to check the results of the calculations by measurements of the tag lengths of restorative resins placed on acid etched enamel. The rate of dissolution was measured in monomers of varying viscosity in a glass syringe by means of a stereo microscope. The calculations showed that the depth of penetration decreases only slightly with viscosity. Thin sections of restorative resins placed on acid etched enamel were prepared whereafter the enamel was dissolved in hydrochloric acid. Tag lengths of 50 micron or more were observed with composite as well as non-composite resins.
粘度、表面张力和接触角是影响修复性树脂渗入酸蚀釉质的因素。此外，当树脂在毛细作用力下被吸入酸蚀釉质的孔隙时， entrapped air 的压力会增加。压力增加会导致空气溶解在在一个大气压下已被空气饱和的树脂中。本研究的目的是：1）研究在压力增加时所含气泡的溶解速率；2）利用这些结果通过毛细孔隙的圆柱形模型计算渗透深度；3）通过测量放置在酸蚀釉质上的修复性树脂的标签长度来检验计算结果。通过体视显微镜在玻璃注射器中测量不同粘度单体中的溶解速率。计算结果表明，渗透深度仅随粘度略有下降。制备了放置在酸蚀釉质上的修复性树脂薄片，然后将釉质溶解在盐酸中。观察到复合树脂和非复合树脂的标签长度为50微米或更长。
