Effect of shelf life on compressive strength of type iv gypsum
Effect of shelf life on compressive strength of type iv gypsum
复制标题
保质期对IV型石膏抗压强度的影响
DOI：
10.1088/1742-6596/884/1/012092
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Damiyanti
中科院分区：
文献类型：
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作者：
K. S. Kusumastuti;Bambang Irawan;M. Damiyanti
IV型石膏作为牙科间接修复工作模型的材料，应具有强度和耐磨性。这些属性取决于产品的保质期和适当的储存方式，而这一点有时很容易被卖家忽略。本研究的目的是观察保质期对不同生产日期的IV型石膏抗压强度的影响。将20个圆柱形试样分为生产日期不同的两组，采用十字头速度为1 mm / min、载荷为2500 kgf的通用试验。数据采用独立t检验进行分析。两组石膏的抗压强度差异有统计学意义（p<0.05），储存时间越长，石膏的抗压强度越高。
Type IV gypsum, as a dental material for an indirect restoration’s working model, should have strength and abrasive-resistant properties. These properties depend on the product’s shelf life and its proper storage, which sometimes are easily missed by sellers. The aim of this research was to observe the effect of shelf life on the compressive strength of type IV gypsum with different production dates. Twenty cylindrical specimens were separated into two groups with different production dates and tested with a universal testing with the crosshead speed of 1 mm per minute and a load of 2,500 kgf. The data were analyzed with independent t-tests. There was a significant difference (p<0.05) in the compressive strength between the two groups with an increase in compressive strength seen in the gypsum that was stored longer.