Price R B, Gerrow J D, Sutow E J, MacSween R
Dalhousie University Faculty of Dentistry, Halifax, Nova Scotia.
Int J Prosthodont. 1991 Mar-Apr;4(2):169-74.
This study determined the dimensional accuracy of dies made using a combination of four impression materials and three Type IV die stones. A metal die was prepared for a molar complete cast crown, and 10 stone replicas were made using 12 different combinations of impression materials and die stones. The distances between reference points on the metal and stone dies were measured in three directions with a traveling microscope. Analysis of variance and Duncan's MR comparisons (P less than or equal to .05) showed that all of the stone dies were larger than the metal die. Although there were significant differences between some of the impression material/die stone combinations, all of the stone dies were measured to be within 9 microns of each other. No one impression material/die stone combination consistently produced the smallest or largest die in the three measured directions.
本研究确定了使用四种印模材料和三种IV型代型石膏组合制作的代型的尺寸精度。为一颗磨牙全冠制作了金属代型，并使用印模材料和代型石膏的12种不同组合制作了10个石膏复制品。用移动显微镜在三个方向上测量金属代型和石膏代型上参考点之间的距离。方差分析和邓肯多重比较（P≤0.05）表明，所有石膏代型都比金属代型大。虽然某些印模材料/代型石膏组合之间存在显著差异，但所有石膏代型的测量尺寸相互之间相差在9微米以内。在三个测量方向上，没有一种印模材料/代型石膏组合始终产生最小或最大的代型。
