Phillips R W
Int Dent J. 1975 Dec;25(4):236-41.
Composite materials were first introduced for use in Class III and Class V cavities. They have now been accepted as the most popular material for the restoration of Class IV cavities and of fractured incisors and their use in Class I and Class II cavities has been advocated. Laboratory investigation of the physical properties of the composite materials suggests that with the exception of hardness, the values recorded are comparable with those for amalgam. In their favour are a lower coefficient of thermal conductivity and superior aesthetics. It has been claimed that a Class II composite restoration can be placed more easily and more rapidly than an amalgam but if comparable contour and adaptation is to be achieved, this claim cannot be substantiated. In contrast to laboratory studies, clinical research has shown that composite materials have some shortcomings. Their colour tends to become more yellow with time and their ability to resist marginal percolation is inferior to that of amalgam. Under clinical conditions their resistance to abrasion is unsatisfactory because of the failure of the bond between the filler particles and the resin. On balance, at the present time amalgam is preferable to composites for Class I and Class II restorations except in cases where aesthetics is the overriding consideration.
复合材料最初被引入用于Ⅲ类和Ⅴ类洞修复。如今，它们已被公认为修复Ⅳ类洞以及折断切牙最常用的材料，并且有人主张将其用于Ⅰ类和Ⅱ类洞修复。对复合材料物理性能的实验室研究表明，除硬度外，所记录的值与汞合金相当。其优点是热导率较低且美观性更佳。有人声称Ⅱ类复合树脂修复体的放置比汞合金更容易、更迅速，但如果要达到相当的外形和贴合度，这一说法无法得到证实。与实验室研究相反，临床研究表明复合材料存在一些缺点。随着时间推移，它们的颜色往往会变得更黄，并且它们抵抗边缘微渗漏的能力不如汞合金。在临床条件下，由于填料颗粒与树脂之间的粘结失效，其耐磨性不尽人意。总体而言，目前对于Ⅰ类和Ⅱ类修复体，除了美学是首要考虑因素的情况外，汞合金比复合材料更可取。
