Tjan A H, Nemetz H, Nguyen L T, Contino R
Loma Linda University, School of Dentistry, Calif.
J Prosthet Dent. 1992 Jul;68(1):19-28. doi: 10.1016/0022-3913(92)90278-i.
The effect of tray space on the dimensional accuracy and stability of impressions made from four brands of monophasic polyvinyl siloxane material was assessed on the recovered stone casts by quantitative and qualitative methods. In general, both evaluation methods agreed that tray space and repeat pour did not affect the accuracy of the dies for individual castings. But disagreement was observed in the findings for fixed partial dentures (FPDs). Quantitative measurement of the interpreparation (IP) dimensions did suggest the possibility of a potential problem when a FPD is cast in one piece because of a significantly reduced distance between the two abutments. However, from the findings of this study it can be concluded that a rigid stock tray can be used with a monophasic polyvinyl siloxane impression material.
通过定量和定性方法，在回收的石膏模型上评估托盘空间对四种单相聚硅氧烷材料制成的印模尺寸精度和稳定性的影响。总体而言，两种评估方法均认为托盘空间和重复灌注不会影响单个铸件模型的精度。但在固定局部义齿（FPD）的研究结果中观察到了分歧。对牙间隙（IP）尺寸的定量测量确实表明，当FPD整体铸造时，由于两个基牙之间的距离显著减小，可能存在潜在问题。然而，从本研究的结果可以得出结论，刚性成品托盘可与单相聚硅氧烷印模材料一起使用。
