Cohen B I, Pagnillo M K, Musikant B L, Deutsch A S
Essential Dental Laboratories, South Hackensack, NJ, USA.
J Prosthodont. 1998 Jun;7(2):111-3. doi: 10.1111/j.1532-849x.1998.tb00189.x.
The purpose of this investigation was to examine the tear strength of four irreversible hydrocolloid (alginate) impression materials (Tare-Free Alg, Jeltrate, Identic, and Kromopan).
Eighty specimens, 20 for each alginate tested, were according to the manufacturers' instructions. A cutting die described in American Standard Test and Material document D-1004-94a was used to prepare test specimens. Immediately after removal from the cutting die, test specimens were measured at five points with an electronic caliper. Test specimens were placed into a specialized jig, and a Shimpo force gauge was used to measure tear strength. The tear test was performed no more than 10 minutes after mixing the alginate material with water. The tear strength was then calculated. One-way ANOVA was used to compare the mean force required to induce tearing for each of the four groups, followed by the Newman-Keuls pairwise multiple comparisons test.
Results were considered statistically significant at p < .05. There was a statistically significant difference between alginate materials (p < .0001). The Newman-Keuls multiple comparisons procedure showed that Tare-Free Alg (514.5 g/cm) had a significantly higher tear strength value (p < .0001) than Jeltrate (259.0 g/cm), Identic (289.9 g/cm), and Kromopan (323.9 g/cm).
Tare-Free Alg had the highest tear strength value, followed by Jeltrate, Identic, and Kromopan.
本研究的目的是检测四种不可逆水胶体（藻酸盐）印模材料（无撕裂藻酸盐、Jeltrate、Identic和Kromopan）的撕裂强度。
按照制造商的说明制备了80个样本，每种测试藻酸盐各20个。使用美国材料与试验协会标准文件D-1004-94a中描述的切割模具制备测试样本。从切割模具中取出后，立即用电子卡尺在五个点测量测试样本。将测试样本放入专门的夹具中，并用岛津测力计测量撕裂强度。在将藻酸盐材料与水混合后不超过10分钟进行撕裂测试。然后计算撕裂强度。使用单因素方差分析比较四组中每组引起撕裂所需的平均力，随后进行纽曼-基尔斯两两多重比较检验。
当p < .05时，结果被认为具有统计学意义。藻酸盐材料之间存在统计学显著差异（p < .0001）。纽曼-基尔斯多重比较程序表明，无撕裂藻酸盐（514.5 g/cm）的撕裂强度值显著高于Jeltrate（259.0 g/cm）、Identic（289.9 g/cm）和Kromopan（323.9 g/cm）（p < .0001）。
无撕裂藻酸盐的撕裂强度值最高，其次是Jeltrate、Identic和Kromopan。
