Li Zhenchun, Zhang Xiaohua, Hao Fengyu
Department of Prosthodontics, School of Stomatology, China Medical University, Shenyang 110002, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2003 Oct;21(5):406-9.
To compare the influence of different investment materials, methods and crown height on the cast shrinkage of full crowns made of dental base metal alloy.
All of the 288 wax patterns were made and divided into three groups according to their crown height. In every group, wax patterns were invested in metal rings and paper rings with three types investment material and cast with base metal alloys. Then the inside diameters of castings were measured and analyzed by statistical package SPSS.
Differences between groups invested with the three types of material were significant(P < 0.01). There were significant difference between the groups investing with metal rings and paper rings(P < 0.01).
The component of investment material and invested ring can affect the cast shrinkage of dental base metal alloy apparently.
比较不同包埋材料、方法及冠高度对牙科贱金属合金全冠铸造收缩的影响。
制作288个蜡型，根据冠高度分为三组。每组蜡型分别用三种包埋材料在金属环和纸环中包埋，并用贱金属合金铸造。然后测量铸件内径，并用统计软件SPSS进行分析。
三种材料包埋组之间差异有统计学意义（P<0.01）。金属环包埋组与纸环包埋组之间差异有统计学意义（P<0.01）。
包埋材料成分及包埋环可明显影响牙科贱金属合金的铸造收缩。
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