铸接式衔铁吸附面性状的实验研究

目的:用铸接法制作磁性覆盖义齿根面结构,分别采用不同合金行常规铸造,观察不同合金铸造温度对衔铁吸附面性状的影响。方法:采用金合金、镍铬合金、纯钛,分别与Magdisc500成品衔铁包埋铸造,制作根面结构。用扫描电镜和电子探针对打磨抛光前衔铁表面附着物进行形貌观察和成分分析。结果:金合金组及镍铬合金组衔铁表面无氧化物生成,纯钛组衔铁表面有氧化物生成,3组试件衔铁表面的附着物均有包埋料残余。结论:不同铸造温度的合金会对衔铁吸附面产生不同的影响,提示临床上应采用金合金或镍铬合金铸接衔铁。

Characters of the surface of the cast-bonded keeper:An experimental study

PURPOSE: This study is aimed to analyze the characters of the surface of the keeper after cast-bonded in varied temperatures. METHODS: Twelve keepers were divided into three groups: the gold alloy group, the Ni-Cr alloy group and the Ti group with four samples in each group.A sample that contained a Magdisc 500 keeper was fabricated with the cast-bonded technique. Then, the surface of the sample was observed under scanning electron microscope (SEM) and its elements were analyzed with the electron probe. RESULTS: The results showed that there was no oxide film on the surface of the keeper in the gold alloy group and the Ni-Cr alloy group, but there was an oxide film on the surface of the keeper in the Ti group. However, remains of the investment materials were found on the surface of the sample of three groups. CONCLUSIONS: The study suggested that the casting temperature affect the characters of the surface of the cast-bonded keeper.Gold alloy or Ni-Cr alloy is of better properties for clinical use. Supported by Shanghai Leading Academic Discipline Project (Grant No.T0202).