热铸型陶瓷包埋料的研制和铸造精度的检测.pdfVIP

·622· 热铸型陶瓷包埋料的研制和铸造精度的检测 黄慧1，钱法汤2 (1．武汉科技大学医学院湖北武汉430064；2．武汉大学口腔医院) [摘要] 目的：根据新型热铸型玻璃陶瓷的性能，研制出专用包埋材料，并对其性能和铸造精度进行检测。方 法：通过组分筛选和工艺合成得出优选配方，对包埋料的物理性能进行检测；并用研制的包埋料铸造陶瓷全冠，用 片切法观察代型与全冠之间的粘固膜厚度。结果：热铸型陶瓷包埋料为石英磷酸盐包埋料，凝固时间8．5—9min， h后29 凝固膨胀率2h后为0．58％，800℃热膨胀率为0．78％，总膨胀率为1．36％，抗压强度24MPa，800℃焙烧 后为17MPa。代型与陶瓷全冠之间的粘固膜厚度，与对照组之间无显著性差异(P0．05)。结论：热铸型陶瓷专 用包埋料具有适宜的凝固时间、膨胀率及抗压强度，能够制作出适合性良好的陶瓷修复体。 [关键词]磷酸盐包埋料；热铸型陶瓷；凝固膨胀；热膨胀；抗压强度 [中图分类号]R783．2[文献标识码]A The ofa investmentusedfortheheat ceramicsHUANG studyspecial pressed Hui．QIAN WuhanScienceand of Technology 430064，China College University，Wuhan ofthis wastoforma bondedinvestmentwhichWSused [Abstract]Objective：Thepurposestudy speciNphosphate fortheheat ceramics．Method：Thenewinvestmentwasformed tothe andse— pressedglass accordingcomponentanalysis lectionandthenitsmechanical and were timeWaS properties tested．Result：Thesetting 8．5～9min，the castingaccuracy was0．58％，thermal was0．78％，thetotal was1．36％．The settingexpansion expansion expansion compressivestrength film ofthematerialwas29MPa(24h)．17MPa(afterheatin800℃)．Theresultsofcementthicknessrevealedtherewere no differencesbetweenthetwo newinvestmenthadexhibitedthe significant groups．Conclusion：The clinicallyacceptable andthermal and ofthenewinvestmentcan settingtime．setting expansioncompressivestrength．Theexpansion compen— sate