Frey Gary, Lu Huan, Powers John
University of Texas Dental Branch at Houston, Department of Restorative Denistry and Biomaterials, Texas 77030, USA.
J Prosthodont. 2005 Dec;14(4):221-5. doi: 10.1111/j.1532-849X.2005.00047.x.
A commercial mechanical mixer is available to make the mixing of alginate more convenient and more consistent for the practitioner; however, there is very little information on the mechanical properties of alginate mixed with this device as compared with hand mixing.
To compare the mechanical properties of alginate impression materials mixed with a mechanical mixer (Alginator II, Cadco) and hand mixing.
Three alginate impression materials (Identic, Jeltrate, and Kromopan) were tested. Strain in compression, elastic recovery, and compressive strength were measured according to ANSI/ADA specification no. 18-1992; tear energy was measured using a pants tear test. Five specimens were prepared for each group with 12 groups for the mechanical mixer and 12 groups for hand mixing, for a total of 120 specimens. A two-way analysis of variance and Fisher's PLSD test at the 0.05 level of significance were used to analyze the data.
There were statistically significant differences in properties among the materials, but mixing technique had no statistically significant effect on strain in compression and tear energy.
The mechanical mixer improved elastic recovery and compressive strength of the alginate impression materials tested and had no effect on strain in compression and tear energy. A mechanical mixer facilitates the mixing of alginate impression materials and improves some mechanical properties.
有一种商用机械搅拌器可供使用，能让从业者更方便、更稳定地搅拌藻酸盐；然而，与手工搅拌相比，关于使用这种设备搅拌的藻酸盐的机械性能的信息非常少。
比较用机械搅拌器（Alginator II，Cadco）和手工搅拌的藻酸盐印模材料的机械性能。
测试了三种藻酸盐印模材料（Identic、Jeltrate和Kromopan）。根据ANSI/ADA规范第18 - 1992号测量压缩应变、弹性回复率和抗压强度；使用裤形撕裂试验测量撕裂能。每组制备五个样本，机械搅拌器组12组，手工搅拌组12组，共120个样本。采用双因素方差分析和显著性水平为0.05的Fisher最小显著差数法检验来分析数据。
材料之间的性能存在统计学显著差异，但搅拌技术对压缩应变和撕裂能没有统计学显著影响。
机械搅拌器改善了所测试的藻酸盐印模材料的弹性回复率和抗压强度，对压缩应变和撕裂能没有影响。机械搅拌器便于藻酸盐印模材料的搅拌并改善了一些机械性能。
