Taira M, Okazaki M, Takahashi J, Kubo F
Department of Dental Materials Science and Technology, Osaka University Faculty of Dentistry, and Taisei Dental Manufacturing Corporation Limited, Osaka, Japan.
J Oral Rehabil. 2000 Apr;27(4):306-11. doi: 10.1046/j.1365-2842.2000.00519.x.
Six commercial phosphate-bonded silica investments were mixed with four different mixing methods such as hand, two conventional blade-driven vacuum mixers and a new planetary mixing device, and examined for their setting expansion and compressive strength. The two properties often altered, depending upon the mixing method and the investment. The setting expansion of three investments were significantly affected by the mixing method while those of the other three were not. Compressive strength of all six investments varied by changing the mixing method. It is emphasized here that a mixing method and mixing condition must be properly set for each investment to improve the fit of the final metallic castings. This study also suggests that the planetary mixing device is a useful substitute for conventional blade-driven vacuum mixers.
将六种商用磷酸盐结合的二氧化硅包埋材料与四种不同的混合方法（如手工、两种传统叶片驱动真空搅拌机和一种新型行星式混合装置）混合，并检测其凝固膨胀率和抗压强度。这两种性能常常会因混合方法和包埋材料的不同而改变。三种包埋材料的凝固膨胀率受混合方法的影响显著，而另外三种则不受影响。通过改变混合方法，所有六种包埋材料的抗压强度都有所变化。在此强调，必须针对每种包埋材料正确设置混合方法和混合条件，以提高最终金属铸件的适配性。本研究还表明，行星式混合装置是传统叶片驱动真空搅拌机的一种有用替代品。
