Evaluation of Some Physical Properties of Die Stone Made From Local Raw Gypsum Material

Rejab, Lamia T; Al-Hamdani, Salwan F; Y, Mohammed

doi:10.33899/rden.2012.65066

	Evaluation of Some Physical Properties of Die Stone Made From Local Raw Gypsum Material
Al-Rafidain Dental Journal
Article 15, Volume 12, Issue 2, 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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