Davis D R, Nguyen J H, Grey B L
School of Dentistry, University of California, San Francisco 94143.
Int J Prosthodont. 1992 Sep-Oct;5(5):403-8.
Effective radial setting expansion of wax patterns in a gypsum-bonded investment is influenced by many factors, especially by the diameter of the cylindrical casting ring. The hypothesis tested was that the ratio of the volume of the casting rings to the volume of the ring liner is a primary determinant of radial setting expansion. Mesio-occlusodistal inlay wax patterns were invested individually in plastic casting rings of different lengths and diameters and imaged using xeroradiography. Effective setting expansion was determined in 34-mm-long, 28-mm-diameter rings and used as a predictor of expansion in rings of different sizes. Experimental setting expansion results did not differ significantly from the predicted values.
在石膏粘结包埋材料中蜡型的有效径向凝固膨胀受多种因素影响，尤其是圆柱形铸圈的直径。所检验的假设是铸圈体积与圈衬体积之比是径向凝固膨胀的主要决定因素。近中-咬合-远中嵌体蜡型分别包埋于不同长度和直径的塑料铸圈中，并使用干板X线摄影成像。在34毫米长、28毫米直径的铸圈中测定有效凝固膨胀，并将其用作不同尺寸铸圈膨胀的预测指标。实验凝固膨胀结果与预测值无显著差异。
