McKinney J E, Wu W
J Dent Res. 1985 Nov;64(11):1326-31. doi: 10.1177/00220345850640111601.
The purpose of this work was to determine the influence of chemical food-simulating liquids on the wear of various commercial dental composite restoratives. In many cases, pre-conditioning the restoratives in these liquids for one week produced swelling of the polymer matrix and considerable surface damage. The resulting degradation reduced the hardness and enhanced the wear as measured by a pin-and-disc apparatus. Four kinds of commercial composites were investigated: a conventional quartz-filled, a strontium-glass-filled, a visible-light-activated, and a microfilled composite. The liquids employed were heptane and several aqueous solutions of ethanol with solubility parameters, delta, ranging from delta = 1.5 to 4.8 X 10(4) J1/2m-3/2. With all restoratives, the decline in hardness during pre-conditioning maximized at about delta = 3 X 10(4), which corresponds to a 75% ethanol solution. The wear behavior was considerably more complicated and variable, as discussed in the text. For the most part, the increase in wear rate from pre-conditioning corresponded to the fall in hardness. A notable exception was for the strontium-glass-filled composite pre-conditioned in pure water. Here the wear was enhanced considerably, with no decrease in hardness. In this case, the degradation mode is assumed to be different from the others in that it is attributed to stress corrosion of the glass filler.
这项工作的目的是确定化学食品模拟液对各种商用牙科复合修复材料磨损的影响。在许多情况下，将修复材料在这些液体中预处理一周会导致聚合物基体膨胀和相当程度的表面损伤。由此产生的降解降低了硬度，并通过销盘装置测量发现磨损增加。研究了四种商用复合材料：一种传统的石英填充复合材料、一种锶玻璃填充复合材料、一种可见光活化复合材料和一种微填充复合材料。使用的液体是庚烷和几种乙醇水溶液，其溶解度参数δ范围为δ = 1.5至4.8×10⁴ J¹/²m⁻³/²。对于所有修复材料，预处理过程中硬度的下降在约δ = 3×10⁴时达到最大值，这对应于75%的乙醇溶液。如文中所讨论的，磨损行为要复杂得多且变化不定。在大多数情况下，预处理导致的磨损率增加与硬度下降相对应。一个显著的例外是在纯水中预处理的锶玻璃填充复合材料。此处磨损显著增加，而硬度并未降低。在这种情况下，假定其降解模式与其他情况不同，因为它归因于玻璃填料的应力腐蚀。
