Park S H
College of Dentistry, Yonsei University, Seoul, Korea.
J Prosthet Dent. 1996 Dec;76(6):613-8. doi: 10.1016/s0022-3913(96)90439-4.
The purpose of this study was to compare the changes in the degree of conversion in the various layers of composites after additional heat curing. Four types of composites and three types of inlay ovens were used in this study. Composite was placed in a 4 mm thick Teflon mold and light cured from the top for 60 seconds. Twenty samples were prepared for each composite; 10 of these were additionally heat cured in an inlay oven as the manufacturer recommended. After light curing or light and heat curing, the samples were sectioned into four parts and assigned to groups A, B, C, or D according to their distance from the light source. These sections were then thinned to 50 to 70 mm, and these wafers were analyzed with a Fourier Transform Infrared spectrometer to determine the degree of conversion. A standard baseline technique was used to calculate the degree of conversion. When the composites were heat cured, significant increases in the degree of conversion were noted throughout the samples, but the amount of increase differed among materials. Thus the clinical performance of a heat-treated composite inlay may be different depending on materials.
本研究的目的是比较额外热固化后复合材料各层转化率的变化。本研究使用了四种类型的复合材料和三种类型的嵌体炉。将复合材料置于4毫米厚的聚四氟乙烯模具中，从顶部进行光固化60秒。每种复合材料制备20个样本；其中10个按照制造商的建议在嵌体炉中进行额外热固化。在光固化或光热固化后，将样本切成四部分，并根据它们与光源的距离分为A、B、C或D组。然后将这些切片减薄至50至70毫米，并用傅里叶变换红外光谱仪分析这些薄片以确定转化率。使用标准基线技术计算转化率。当复合材料进行热固化时，整个样本的转化率显著增加，但增加的量因材料而异。因此，热处理复合嵌体的临床性能可能因材料而异。
