Wassell R W, McCabe J F, Walls A W
Department of Restorative Dentistry, Dental School, University of Newcastle Upon Tyne, UK.
J Dent. 1997 Jan;25(1):49-52. doi: 10.1016/0300-5712(95)00120-4.
One of the reasons for using composite inlays is that restorations can be tempered. Composites tempered with heat and light have, at least initially, an enhanced degree of cure which, it is claimed, improves their physical properties, including wear resistance. The aim of this study was to compare the wear rates of a selection of composites in their regular and tempered conditions.
Two hybrid composites (Brilliant Dentin, Coltène; Occlusin, ICI) and a microfilled material (Heliomolar, Ivoclar-Vivadent) were chosen to provide a variety of filler particle and resin systems. Regular composites were cured normally with light while tempered composites were given an additional 8 min secondary cure at 120 degrees C in the Coltène DI500 heat and light oven. Specimens of an amalgam (Dispersalloy, Johnson & Johnson) and a heat/pressure cured composite (Isosit, Ivoclar-Vivadent) were used for comparison. The specimens were stored for either 7 days or 1 year to determine if prolonged water storage affected wear rate. Wear testing was carried out in a two-body wear machine using a steatite abrader as an enamel substitute. ANOVA was used to test the effects on wear rate of tempering, storage time and type of material.
Significant differences were found in wear rate between materials (p < 0.001), but not for tempering or prolonged storage time.
These findings agree with clinical studies which have shown that tempering has little or no influence on the occlusal wear of composite inlays.
使用复合嵌体的原因之一是修复体可以进行回火处理。经加热和光照回火处理的复合材料，至少在初始阶段，固化程度会提高，据称这会改善其物理性能，包括耐磨性。本研究的目的是比较一系列复合材料在常规状态和回火状态下的磨损率。
选择两种混合复合材料（Brilliant Dentin，库尔齿科；Occlusin，帝国化学工业公司）和一种微填料材料（Heliomolar，义获嘉伟瓦登特），以提供多种填料颗粒和树脂体系。常规复合材料用光照正常固化，而回火复合材料在库尔齿科DI500热光烤箱中于120摄氏度额外进行8分钟的二次固化。使用一种汞合金（Dispersalloy，强生公司）和一种热压固化复合材料（Isosit，义获嘉伟瓦登特）的标本进行比较。将标本储存7天或1年，以确定长时间的水储存是否会影响磨损率。磨损测试在两体磨损试验机中进行，使用滑石磨料作为牙釉质替代品。使用方差分析来测试回火、储存时间和材料类型对磨损率的影响。
材料之间的磨损率存在显著差异（p < 0.001），但回火或长时间储存时间对磨损率没有显著影响。
这些发现与临床研究一致，临床研究表明回火对复合嵌体的咬合磨损几乎没有影响。
