包埋材料不同配比对钴铬合金铸造冠精密度的影响(1)
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2010年1月1日
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【摘要】目的:探讨磷酸盐包埋材料的不同配比对钴铬合金铸造全冠精密度的影响,提高铸造精密性。方法:以磨牙为研究对象制作锥型黄铜帽状试件,以相应的圆柱型黄铜管控制熔模的高度、厚度,高度差为1.8±0.1mm,将嵌体蜡注入得到全冠蜡型。采用无圈包埋法包埋,共分三组,分别为: Bellavest快速包埋材料混合液中专用液的比例分别为60%、80%、100%。采用包埋后0.5小时快速升温法焙烧;高频离心铸造、喷砂、就位。用加成型硅橡胶印模材料取得铸件与模具的间隙模型,用金相显微镜观察硅橡胶膜的厚度并拍摄,用金相检验软件系统测量硅橡胶膜的厚度即可得到铸件与模具的间隙值,在硅橡胶代型顶面、轴面分别取点测量硅橡胶膜的厚度;将铸件在模具上就位,用金相显微镜采集图像并测量铸件的边缘浮出量。结果:Bellavest包埋料混合液中专用液的比例分别为60%、80%、100%快速升温法三组中,硅橡胶膜的顶面厚度、金属边缘浮出量差别有统计学意义;轴面厚度差别无统计学意义。结论:磷酸盐包埋材料的不同配比对铸造全冠的精密度的影响有显著差异。
【关键词】磷酸盐包埋材料;铸造全冠;精密度;边缘浮出量
【中图分类号】R783.1 【文献标识码】A 【文章编号】1008-6455(2010)07-0266-03
Study in precision of casting crown with bonded investments in different proportion
Chen Yu Zong Min
【Abstract】Objections: To investigate the effect of the precision of casting crown with phosphate-bonded investment with different proportion, improve the accuracy of casting in clinic. Methods: We chose molar as our objects, made taper brass-caped testing flip. We used corresponding brass cannulation to control the fusing mode’s height and width, the difference of it’s height was 1.8±0.1mm. Then we melt the inlay wax into the tooting. When the wax was cooling we obtained the full crown wax model. After that, we used non-band embedding method to band casting rings, in which there were 3 casting rings with Bellavest fast band investment, the proportion of the special liquid of the bond investment was 60%,80%,100%, respectively. The method of ascending the temperature was fast speed method. After embedding, we did high-frequency centrifugal force casting, sand blasted and fitted. Then we used additional type silicone rubber impression material to obtain the clearance model between the casting crown and tooting, observed the thickness of the silicone rubber impression film and took pictures with metallurgical microscope, measured the thickness of the silicone rubber impression film with metallurgical analysis software system, so that we could get the value of the clearance between the casting crown and tooting, measured the width of the silicon rubber impression film at the top and axis, when we fitted the casting crown to the tooting, we could use the photo took by the metallurgical microscope and measured the margin opening of the casting crown ......
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