华西口腔医学杂志

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不同包埋材料对基底合金铸造收缩影响的实验研究

李振春,张霄华,郝凤渝   

  1. 110002 中国医科大学附属口腔医院修复科(李振春, 郝凤渝),沈阳市口腔医院修复科(张霄华)
  • 收稿日期:2003-10-25 修回日期:2003-10-25 出版日期:2003-10-20 发布日期:2003-10-20
  • 基金资助:
    本课题为辽宁省科学技术基金资助项目(编号99010300602)

Effects of Investment Materials on Cast Shrinkage of Base Metal Alloys

LI Zhenchun*,ZHANGXiaohua,HAO Fengyu   

  1. *Department ofProsthodontics,School ofStomatology,China Medical Universi- ty,Shenyang110002,China
  • Received:2003-10-25 Revised:2003-10-25 Online:2003-10-20 Published:2003-10-20

摘要:

目的 比较不同包埋材料、不同包埋方法以及不同金属冠高度对铸造金属全冠收缩的影响,指导临床选择较为合适的材料和方法。方法 制作相同直径和厚度,高度分别为4 mm、6 mm和8 mm的全冠蜡型各96 个。选用3种磷酸盐包埋材料分别进行有圈包埋和无圈包埋,铸造后测量铸件边缘内径,对数据进行统计学分析。结果 (1)不同包埋材料对基底合金的铸造收缩的影响存在差异(P<0·01)。用水调拌的X-20 Chrome包埋材料铸件表现出较大的体积收缩率。GILVESTⅡS包埋材料和贺利氏包埋材料的膨胀能较好补偿合金的铸造收缩,铸件有较好的精密度。(2)不同包埋方法对基底合金的铸造收缩存在显著影响。无圈包埋的基底合金的铸造收缩小于有圈包埋。(3)不同冠高度对基底合金铸造收缩的影响无显著差异(P>0·05)。结论 不同包埋材料对铸造收缩影响不同,无圈包埋时的铸造收缩小于有圈包埋。

关键词: 包埋材料, 包埋, 铸造收缩

Abstract:

Objective 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.Methods All of the 288 wax patternswere made and divided into three groups according to their crown height. In every group, wax patternswere invested in metal rings and paper ringswith three types investmentmaterial and castwith base metal alloys. Then the inside diameters of castingswere measured and analyzed by statistical package SPSS.Results Differences between groups invested with the three types of material were significant(P<0·01).There were significant difference between the groups investingwithmetal rings and paper rings(P<0·01).Conclusion The component of investment material and invested ring can affect the cast shrinkage of dental base metal alloy apparently.

Key words: investment materials, invest, cast shrinkage