Chaffee N R, Bailey J H, Sherrard D J
Department of Adult Restorative Dentistry, University of Nebraska Medical Center College of Dentistry, Lincoln, USA.
J Prosthet Dent. 1997 Feb;77(2):131-5.
Improved dental stone has been widely used for producing dies for the fabrication of restorations with the lost-wax technique. Improved dental stone is used for several reasons, but it is selected most often because of its reasonable cost, ease of use, and ability to produce consistent results.
This study evaluated the ability of an epoxy resin die material and a type IV dental stone to dimensionally reproduce a custom-fabricated metal die.
Dies were fabricated and measurements were made from three reference lines. Measurements were repeated three times for the master die and for the specimen dies. A mean measurement and percent relative change for each dimension was calculated.
A significant difference in the relative change for die height was found between the groups studied (p < 0.003).
This epoxy die system will provide a degree of dimensional accuracy comparable to gypsum when used with addition silicone impression material.
改良牙科石膏已广泛用于采用失蜡法制作修复体的铸模。选用改良牙科石膏有多种原因，但最常被选用是因其成本合理、使用方便且能产生一致的结果。
本研究评估了一种环氧树脂铸模材料和IV型牙科石膏在尺寸上复制定制金属铸模的能力。
制作铸模，并从三条参考线进行测量。对母模和样本铸模的测量均重复三次。计算每个尺寸的平均测量值和相对变化百分比。
在所研究的组之间，铸模高度的相对变化存在显著差异（p < 0.003）。
当与加成型硅橡胶印模材料一起使用时，这种环氧树脂铸模系统将提供与石膏相当的尺寸精度。
