[浇口铸造设计对银钯牙科合金表面孔隙率的影响]。

Odontostomatologike proodos Pub Date : 1989-06-01
N N Tsiggos, P D Garefis
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引用次数: 0

摘要

本研究的目的是探讨在铸造金属丙烯酸固定局部义齿用银钯牙合金时,对表面气孔面积和气孔数量的最佳铸造浇口设计。我们对72个mod样品的216个外表面进行了观察和研究,这些样品使用四种不同的铸造浇口设计和三种银钯牙科合金(Panag, Pangold和Palliag M.)铸造。对我们的发现进行了评估和统计分析。我们的研究结果如下。1. 结果表明,“合金”因素对表面气孔的面积和数量没有影响,相反,“设计”因素对牙用合金的面积和数量有很大影响。2. 在铸造银钯牙用合金时,采用冷却装置和浇口扣合金的固定,减少了表面气孔的面积和数量。3.直浇口和靠近模具热中心的试样放置比使用精密转子系统为减少表面气孔的数量和面积创造了更好的条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Influence of the sprue casting design on the surface porosity of the silver-palladium dental alloys].

The purpose of this work is to investigate and find out the best "design" of the casting sprues on the area and the number of the surface porosity when we cast silver-palladium dental alloys for metalloacrylics fixed partial dentures. Our observation and research have been done on 216 external surfaces from 72 M.O.D. specimens, which were casted using four different designs of casting sprues and three types of silver-palladium dental alloys (Panag, Pangold and Palliag M.). The evaluation of our findings and statistical analysis have been done. The findings of our study are the following. 1. It has been found that the "alloy" factor doesn't influence the area and the number of the surface porosity we examined, on the contrary it has been found that the "design" factor has great influence on the area and the number of the dental alloys. 2. The use of chill-sets and the securing of sprue button alloy decrease the area and the number of the surface porosity when we cast silver-palladium dental alloys. 3. The straight sprues and the placing of the specimens near the heat-center of the mold created much better conditions for decreasing the number and the area of the surface porosity than when we use the preci-roto system.

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