Effect of shelf life on compressive strength of type IV gypsum

被引：0
|
作者：
Kusumastuti, K. S. [1 ]
Irawan, B. [1 ]
Damiyanti, M. [1 ]
机构：
[1] Univ Indonesia, Dept Dent Mat, Fac Dent, Jakarta, Indonesia
来源：
1ST PHYSICS AND TECHNOLOGIES IN MEDICINE AND DENTISTRY SYMPOSIUM | 2017年 / 884卷
关键词：
SURFACE-ROUGHNESS;
D O I：
10.1088/1742-6596/884/1/012092
中图分类号：
R78 [口腔科学];
学科分类号：
1003 ;
摘要：
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.
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页数：6
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