Study on Reinforced Composite Resin Restorations by Inserting with the Megafillers

我们首先评价了在复合树脂修复体中插入“Megfiller”对聚合收缩力和聚合收缩率的影响。测定材料包括化学固化复合材料和光固化复合材料。收缩力测量系统由制备试样的透明聚四氟乙烯管、小型称重传感器、动态应变仪和笔记录仪组成。从混合或辐照开始到90分钟，用汞浴法每10秒测量一次复合材料的线性聚合收缩率。结果表明，“Megafiller”在降低聚合收缩方面效果显著，但在降低聚合收缩力方面并不总是有效。在接下来的研究中，我们通过玻璃珠磨损测试和常规刷牙磨损测试来评估“Megafiller”插入对耐磨性的影响。磨损深度是通过使用精确到1微米的轮廓投影仪测量磨损试验前后试样的厚度来确定的。总的来说，“百万填料”的加入降低了复合材料的磨损深度，但除了少数材料外，添加和不添加百万填料的复合材料的磨损深度差异不显著。在某些复合树脂中，巨型填料的湿度略有不同。目前，我们正在测定几种类型的陶瓷填充剂（phil1mm）的插入对复合树脂热膨胀系数的影响。

We evaluated the effects of inserting "Megfiller" to composite resin restorations on the polymerization contraction force and the polymerization shrinkage rate firstly. The materials used for the determination included chemically cured composites and light-cured composites. The system for measuring contraction force consisted of a transparent teflon tube for preparing the specimen, a small load cell, a dynamic strain guage and a pen-recorder. Linear polymerization shrinkage of the composites was measured every 10 seconds from the start of mixing or irradiation to 90 minutes by the mercury bath medhod. The results suggested that "Megafiller" was markedly effective in reducing polymerization shrinkage, but was not always effective in reducing the contraction force during polymerization. In the next study, we examined the effects of "Megafiller" insertion on wear resistance evaluated by the glass beads abrasion test, and the conventioinal toothbrushing abrasion test. The depth of wear was determined by measuring the thickness of the specimens before and after the wear tests using a profile projector accurate to 1 um. In general, the depth of wear of the composites was reduced by "Megafiller" insertion, but the differences in the depth of wear between composites with and without the megafiller were not significant except for a few materials. There were slight differences in the wetness of the megafiller in some composite resins. At the present, we are determinig the effect of several type ceramic megafillers (phi1mm) insertion on the coefficient of thermal expansion of composite resins.