Influence of shelf life on the setting time of type IV gypsum

1st Physics and Technologies in Medicine and Dentistry Symposium

物理学;医药卫生

Hapsari, M.L.^1 ; Irawan, B.^1 ; Damiyanti, M.^1

Department of Dental Materials, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia^1

关键词: Setting time;    Shelf life;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/884/1/012094/pdf
DOI  :  10.1088/1742-6596/884/1/012094

学科分类：卫生学

来源: IOP

【 摘 要 】

Although expired materials can exhibit a deterioration in their properties, expired type IV gypsum can still be found on the market. In order to evaluate the influence of the shelf life on its setting time, two groups of type IV gypsum (GC Fuji rock EP) with different expiration dates were used in this research. The setting time tests were done in a mold using a Vicat Needle apparatus. The results of the statistical analysis showed a significant difference (p