中华口腔医学研究杂志(电子版) ›› 2011, Vol. 5 ›› Issue (04) : 387 -391. doi: 10.3877/cma.j.issn.1674-1366.2011.04.008 × 扫一扫
基础研究
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Chun-mei YU1,†(), Yang WANG1, Rui-hong LI1
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于春梅, 王洋, 李瑞虹. 照射时间及温度对纳米树脂硬度的影响[J/OL]. 中华口腔医学研究杂志(电子版), 2011, 5(04): 387-391.
Chun-mei YU, Yang WANG, Rui-hong LI. The influence of curing time and temperature on the microhardness of nano-composite resin[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(04): 387-391.
目的
探讨经不同温度、 不同时间处理的纳米树脂用卤素光固树脂硬度的差别。
方法
在10℃、25℃、40℃三种不同温度下处理光固化纳米填料复合树脂Z350,分别用QHL75 LED 灯照射20 s 和40 s,采用显微维氏硬度计测量树脂试件顶面和底面的硬度。 数据采用SPSS 11.0 软件包进行方差分析。
结果
树脂顶面和底面硬度值随着温度升高而增高(P <0.05)。 延长照射时间,10℃的低温树脂其在顶面和底面硬度有所升高(P <0.05),25℃的常温树脂其底面硬度有所升高(P <0.05)。
结论
树脂试件使用前预加热处理,可以增强树脂的硬度;使用低温树脂时,应适当延长照射时间。
Objective
To investigate the effect of different curing time and temperature on the hardness of composite resin.
Methods
Specimens were fabricated from nanofilled composite resins Z350 and stored at three different temperature (10℃, 25℃, 40℃). Then they were cured with LED light curing for 20 s or 40 s. The microhardness of the top and bottom surfaces of the specimens were determined by a digital microhardness tester. Statistical analysis was performed using the two-way ANOVA by SPSS 11.0 software package.
Results
The specimens stored at 40℃had higher top and bottom hardness value than that stored at the other temperatures(P <0.05). The specimens stored at 10℃cured for 40 s had higher top and bottom hardness value than that cured for 20 s (P <0.05). The specimens stored at 25℃cured for 40 s had higher bottom hardness value than that cured for 20 s (P <0.05).
Conclusions
The use of prewarmed composite resins help to increase the composite resin hardness. Curing time should be prolonged when the nano-composite resin was used at low temperature.