Comparative Evaluation of Few Physical Properties of Epoxy Resin, Resin-Modified Gypsum and Conventional Type IV Gypsum Die Materials: An in vitro Study
Citation Information :
Gujjarlapudi MC, Reddy SV, Madineni PK, Nunna VN, Manne SD. Comparative Evaluation of Few Physical Properties of Epoxy Resin, Resin-Modified Gypsum and Conventional Type IV Gypsum Die Materials: An in vitro Study. J Contemp Dent Pract 2012; 13 (1):48-54.
To compare and evaluate few physical properties of epoxy resin, resin-modified gypsum and conventional type-IV gypsum die material.
Materials and methods
In the present study, dimensional accuracy, surface detail reproduction and transverse strength of three die materials like epoxy resin (Diemet-E), resin-modified gypsum (Synarock) and conventional type-IV gypsum (Ultrarock) are analyzed. For dimensional accuracy, master die (Bailey's die) is used and calibrations were made with digital microscope. For surface detail reproduction and transverse strength, rectangular stainless steel master die (Duke's die) was used and calibrations were made with Toolmaker's microscope and Instron universal testing machine respectively. One-way analysis of variance (ANOVA) was performed on the means and standard deviation for groups of each test.
Results
The results of the study showed statistically significant difference among these materials in dimensional accuracy, surface detail reproduction and transverse strength.
Conclusion
Epoxy resin exhibited superiority in dimensional accuracy, surface detail reproduction and transverse strength and is nearest to the standards of accurate die material.
How to cite this article
Gujjarlapudi MC, Reddy SV, Madineni PK, Ealla KKR, Nunna VN, Manne SD. Comparative Evaluation of Few Physical Properties of Epoxy Resin, Resin- Modified Gypsum and Conventional Type IV Gypsum Die Materials: An in vitro Study. J Contemp Dent Pract 2012;13(1): 48-54.
The dimensional accuracy of improved dental stone, silver plated and epoxy resin die material. J Prosthet Dent 1988;59:307-10.
Linear dimensional accuracy of epoxy resin and stone dies. J Prosthet Dent 1981;45:621-25.
Fracture strength of type IV and type V die stone as function of time. J Prosthet Dent 1997;78:554-59.
Comparison of transverse strength and dimensional variation between die stone, die epoxy resin and die polyurethane resin. J Prosthet Dent 1995;74:569-74.
Dimensional accuracy of improved dental stone and epoxy resin die materials Part II: Complete arch form. J Prosthet Dent 1997;77:235-38.
Dimensional accuracy of epoxy resins and their compatability with impression material. J Prosthet Dent 1984;52:500-04.
Ana Christina, et al. Influence of the casting material on the dimensional accuracy of dental dies. Braz Oral Res, São Paulo July/Aug 2011;25(4).
Influence of the supporting die structures on the fracture strength of all-ceramic materials. Clin Oral Investig Aug 16, 2011.