Influence of irradiation time on volumetric shrinkage and flexural properties of flowable resins.
Influence of irradiation time on volumetric shrinkage and flexural properties of flowable resins.
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DOI：
10.4012/dmj.26.892
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发表时间：
2007-11
影响因子：
2.5
通讯作者：
S. Uyama;A. Irokawa;M. Iwasa;M. Tonegawa;Y. Shibuya;K. Tsubota;T. Takamizawa;M. Miyazaki
中科院分区：
文献类型：
--
作者：
S. Uyama;A. Irokawa;M. Iwasa;M. Tonegawa;Y. Shibuya;K. Tsubota;T. Takamizawa;M. Miyazaki
本研究的目的是评估辐照时间对流动性树脂的体积变化和弯曲性能的影响。使用四种市售可流动树脂。对于体积收缩率测量，将树脂糊插入模具（高2 mm，直径4 mm）中，并放入充水的粘度计中。随后以600 mW/cm 2光照射10、20或30秒。然后由水弯月面高度的变化确定试样的体积收缩率，并计算其体积变化百分比。对于挠曲强度测量，将树脂糊剂填充到不锈钢模具（25 X 2 X 2 mm）中，并且首先照射样本的中间三分之一。其余三分之二在与体积收缩测量相同的辐照条件下辐照。在37 ℃水中储存24小时后，以1.0 mm/min的十字头速度进行跨度长度为20 mm的三点弯曲试验。使用单因素方差分析和Tukey HSD检验进行统计分析。除了Estelite Flow Quick之外，所有测试材料的体积收缩率和弯曲强度都随着光照射时间的延长而增加。研究结果表明，光照射时间和树脂复合材料的类型都会影响体积收缩率和弯曲性能。
The purpose of this study was to evaluate the influence of irradiation time on volumetric change and flexural properties of flowable resins. Four commercially available flowable resins were employed. For volumetric shrinkage measurement, resin pastes were inserted into a mold (2 mm in height, 4 mm in diameter) and put into a water-filled dilatometer. This was followed by light irradiation for 10, 20, or 30 seconds at 600 mW/cm2. Volumetric shrinkage of the specimens was then determined from the change in the height of water meniscus, and the percentage volumetric change thereof was calculated. For flexural strength measurement, resin pastes were filled into a stainless steel mold (25 x 2 x 2 mm), and the middle one-third of the specimen was first irradiated. The remaining two-thirds were irradiated under the same irradiation conditions as volumetric shrinkage measurement. After 24-hour storage in 37 degrees C water, three-point flexural tests were performed with a span length of 20 mm at a crosshead speed of 1.0 mm/min. One-way ANOVA followed by Tukey's HSD test were used for statistical analysis. For all materials tested except Estelite Flow Quick, both volumetric shrinkage and flexural strength increased with longer light irradiation time. Results of this study indicated that both volumetric shrinkage and flexural properties were influenced by light irradiation time and resin composite type.