Gujjarlapudi Manmohan Choudary, Reddy S Varalakshmi, Madineni Praveen Kumar, Ealla Kranti Kiran Reddy, Nunna Venkata Narayana, Manne Sanjay Dutt
Department of Prosthodontics, MNR Dental College Hyderabad, Andhra Pradesh, India.
J Contemp Dent Pract. 2012 Jan 1;13(1):48-54. doi: 10.5005/jp-journals-10024-1094.
To compare and evaluate few physical properties of epoxy resin, resin-modified gypsum and conventional type-IV gypsum die material.
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.
The results of the study showed statistically significant difference among these materials in dimensional accuracy, surface detail reproduction and transverse strength.
Epoxy resin exhibited superiority in dimensional accuracy, surface detail reproduction and transverse strength and is nearest to the standards of accurate die material.
比较和评估环氧树脂、树脂改性石膏和传统IV型石膏代型材料的一些物理性能。
在本研究中，分析了三种代型材料，即环氧树脂（Diemet-E）、树脂改性石膏（Synarock）和传统IV型石膏（Ultrarock）的尺寸精度、表面细节再现性和横向强度。对于尺寸精度，使用主代型（贝利代型）并用数字显微镜进行校准。对于表面细节再现性和横向强度，使用矩形不锈钢主代型（杜克代型），并分别用工具显微镜和英斯特朗万能试验机进行校准。对每个测试组的均值和标准差进行单因素方差分析（ANOVA）。
研究结果表明，这些材料在尺寸精度、表面细节再现性和横向强度方面存在统计学上的显著差异。
环氧树脂在尺寸精度、表面细节再现性和横向强度方面表现出优越性，最接近精确代型材料的标准。
