钛铸造包埋材料中ZrO2含量对纯钛铸造全冠适合度的影响

目的:观察改变铸钛包埋材料中ZrO2的含量对钛全冠适合度的影响.方法:用铜制全冠代型模具制作30个全冠蜡型,随机分成a、b、c、d和e共5组,e组作为对照组,用Titavest CB包埋材料一次性包埋.其余各组内包埋采用自行研制的含有不同配比ZrO2的包埋材料,外包埋采用磷酸盐类包埋材料.利用CYCLARCⅡ型真空压力铸钛设备进行铸造.对所得铸件先检查其完整性,再利用实体显微镜测量钛冠边缘适合度.对各组测量值进行单因素方差分析和两两比较.结果:a、b、c和e组铸件无缺陷,铸件的边缘适合度有显著性差异(P＜0.01).d组铸件有较严重的铸造缺陷.结论:随着包埋材料中ZrO2成分的增加,铸件的适合度下降.

Effect of different ZrO2 based investments on the fitness of titanium crown

Objective: To investigate the effect of different contents of ZrO_(2) based investments on the fitness of pure titanium crown. Methods: Thirty complete crown wax patterns made with a brass die were divided randomly into 5 groups(a,b,c,d,e). Group e as the control was invested with Titavest-CB investment. Other groups were invested with different contents of ZrO_(2) based investments. After casting, the integrity of castings was examined and the fitness of the margin of the crown was measured with microscopy. All results were subjected to one-way ANOVA and multiple comparison. Results: Group a,b,c, and e had no casting deficiencies, and results of fitness showed significant differences among groups(P<0.01). Group d had obvious casting deficiencies. Conclusion: As the increase of the ZrO_(2) content in the investment, the fitness of castings reduces.