Evaluation of Some Physical Properties of Die Stone Made From Local Raw Gypsum Material | ||
| Al-Rafidain Dental Journal | ||
| Article 15, Volume 12, Issue 2, December 2012, Pages 309-315 PDF (0 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.33899/rden.2012.65066 | ||
| Authors | ||
| Lamia T Rejab; Salwan F Al-Hamdani; Mohammed Y | ||
| Abstract | ||
| Aim: The aim of this study was to prepare die stone material by dehydration of the local natural raw gypsum in boiling with 30% calcium chloride solution , and then evaluated some physical properties of this prepared die stone. Materials and methods : The values of some physical properties of the pre-pared die stone in boiling with 30% calcium chloride solution which are water/powder ratio, setting time, and compressive strength were compared with that of three types of gypsum products commer-cial die stone, Elite type III dental stone and Iraqi plaster. The data were collected , mean and standard deviation were determined. Statistically, (ANOVA) and Dunnett Pairwise Multiple Comparison test were carried out to determine the significant differences at p≤ 0.05 Results: Results showed that there were no significant differences between the locally prepared die stone and the commercial one at p≤ 0.05 in water/powder ratio and setting time values, but it was significant difference in compressive strength. But there are a significant difference between the physical properties of the locally prepared die stone and Elite type III dental stone and Iraqi plaster. Conclusions: The results showed the physical properties of the locally prepared die stone approach the physical properties of the commercial product according to the recommendation of ADA for gypsum products. | ||
| Keywords | ||
| Gypsum; die stone; Physical Properties | ||
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