Harper R J, Nicholls J I
J Prosthet Dent. 1979 Aug;42(2):172-9. doi: 10.1016/0022-3913(79)90169-0.
A three-dimensional distortion analysis was made of seven indexing-investment systems and six indexing-remount systems. Measurements were made to within +/- 0.005 mm with a Nikon Profile Projector and a linear variable differential transformer (LVDT); distortions (linear and rotational) were calculated by means of a PDP 11/40 computer system. Mean vector displacements, square root deltaX2 + deltaY2 + deltaZ2, were calculated, and a statistical evaluation of the data was completed. The results of the study indicate: 1. The zinc oxide-eugenol (ZOE) indexing-investment system produced a narrower range and a significantly smaller mean distortion than the other six indexing-investment systems. 2. The ZOE-stone remount technique showed significantly less distortion than the ZOE-low-fusing metal or the ZOE-acrylic resin techniques. 3. The polyether-stone remount technique demonstrated significantly less distortion than either the polyether-low-fusing metal or the polyether-acrylic resin system. 4. The polyether-stone remount system was not significantly different from the ZOE-low-fusing metal system. 5. The ZOE-stone remount technique demonstrated a smaller range of distortions, but those distortions were not significantly different from those of the polyether-stone remount technique.
对七个分度-熔模铸造系统和六个分度-重新就位系统进行了三维变形分析。使用尼康轮廓投影仪和线性可变差动变压器（LVDT）进行测量，测量精度达到±0.005毫米；通过PDP 11/40计算机系统计算变形（线性和旋转）。计算平均向量位移，即平方根（ΔX² + ΔY² + ΔZ²），并完成数据的统计评估。研究结果表明：1. 氧化锌-丁香酚（ZOE）分度-熔模铸造系统产生的变形范围更窄，平均变形量明显小于其他六个分度-熔模铸造系统。2. ZOE-石膏重新就位技术的变形明显小于ZOE-低熔合金或ZOE-丙烯酸树脂技术。3. 聚醚-石膏重新就位技术的变形明显小于聚醚-低熔合金或聚醚-丙烯酸树脂系统。4. 聚醚-石膏重新就位系统与ZOE-低熔合金系统无显著差异。5. ZOE-石膏重新就位技术的变形范围较小，但这些变形与聚醚-石膏重新就位技术的变形无显著差异。
