Dennison J B
J Am Dent Assoc. 1982 Sep;105(3):488-92.
Microfilled resins generally have physical properties inferior to those of conventional composites. A lower in organic filler content or higher polymer/filled ratio results in a lower modulus of elasticity, greater thermal dimensional change, less resistance to indentation and abrasion, and greater water sorption. The ability to finish and to maintain a smooth surface texture is a major advantage, although it has not been proved clinically that microfilled resin restorations result in less plaque adherence nor do they enhance soft tissue response. Early clinical trials, after two to three years in vivo, indicate a greater wear resistance for these materials than for conventional composites. At this time, current evidence suggests that a decrease in filler particles size to less than 1 micrometer and a lower filler loading of the resin matrix permit the clinical development and maintenance of a smooth surface texture on restoration surfaces. There is no published evidence that the decrease in many of the physical properties leads to early signs of clinical deterioration and failure. In vivo studies extended for longer periods are necessary to make a knowledgeable judgment on the true clinical value of these composites. A classification system for composite restorative resins is being prepared by the Council on Dental Materials, Instruments, and Equipment. It will be published in a future issue of The Journal.
微填料树脂的物理性能通常不如传统复合材料。有机填料含量较低或聚合物/填料比例较高会导致弹性模量较低、热尺寸变化较大、抗压痕和耐磨性较差以及吸水性较强。尽管尚未在临床上证明微填料树脂修复体导致更少的菌斑附着，也未证明它们能增强软组织反应，但能够修整并保持光滑的表面质地是其主要优点。早期临床试验表明，在体内两到三年后，这些材料比传统复合材料具有更高的耐磨性。目前，现有证据表明，填料颗粒尺寸减小到小于1微米以及树脂基质的填料含量降低，使得修复体表面能够实现临床可接受的光滑表面质地。没有已发表的证据表明许多物理性能的下降会导致临床恶化和失败的早期迹象。需要进行更长时间的体内研究，以便对这些复合材料的真正临床价值做出明智的判断。牙科材料、器械和设备委员会正在制定复合树脂修复材料的分类系统。它将在《牙科杂志》的未来一期上发表。
