Original Research Paper
The Effect Of Postpouring Time On Tensile Strength, Surface Roughness And Compressive Strength Of Type Iv Dental Stone: An In Vitro Study
Dr Niveditha S Prasad, Dr Nivea T Francis, Dr Sheejith M, Dr Ranjith M
A wide variety of materials are used to fabricate dental casts for fixed dental prosthesis, of which Type IV dental stones are commonly used because of its superior physical and mechanical properties. The principal requisites for Type IV dental stones commonly known as die materials are its strength, hardness, abrasion resistance and minimum setting expansion. The strength of die stone is generally expressed in terms of compressive and diametric tensile strength. Another mechanical property is surface roughness, which is influenced by the reproduction of impression material. The time between the pouring and removal of the gypsum cast from impression is termed as postpouring time, which has a major influence on physical and mechanical properties of dental cast. Moreover different commercial brands also exhibit distinct mechanical behaviour.
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