THE EXPANSION OF PHOSPHATE BONDED INVESTMENTS .1. SETTING EXPANSION
THE EXPANSION OF PHOSPHATE BONDED INVESTMENTS .1. SETTING EXPANSION
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DOI：
10.1016/0022-3913(93)90005-9
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发表时间：
1993-08-01
影响因子：
4.6
通讯作者：
MARSHALL, GW
中科院分区：
文献类型：
--
作者：
HUTTON, JE;MARSHALL, GW
价格较低的银和钯(AgPd)牙科铸造合金很受欢迎，但需要磷酸盐结合投资。这类材料的物理性能还没有得到彻底的研究。这项研究确定了三种不同的磷酸盐结合包埋剂是否能够提供足够的膨胀来补偿AgPd的铸造收缩。投资混合蒸馏水或其独特的特殊液体由制造商提供，并允许凝结时间为1小时或24小时。用垂直扩张仪测量固定膨胀度。当加入特殊液体时，材料I的1小时平均凝结膨胀率为0.19%+/-0.01%；材料II的平均凝结膨胀率为0.14%+/-0.03%；材料III的1小时平均凝结膨胀率为1.17%+/-0.08%。设置24小时并没有显著增加环境扩展(p>；0.05)。将这三种投资与蒸馏水混合在一起，大大减少了凝结膨胀。计算了三因素方差分析来评估数据，并调查显著的交互作用和主效应。双向相互作用(物质x液体)显著。这一结果与材料III的含硅量较高的特殊液体的概念相一致。
Less expensive silver and palladium (AgPd) dental casting alloys are popular, but require phosphate bonded investments. The physical properties of such materials have not been thoroughly investigated. This study determined whether three different phosphate bonded investments could provide adequate expansion to compensate for the casting shrinkage of AgPd. The investments were mixed with distilled water or their unique special liquids provided by the manufacturers and allowed setting times of 1 hour or 24 hours. Setting expansions were measured with a vertical dilatometer. When mixed with special liquid, material I had a mean setting (1 hour) expansion of 0.19% +/- 0.01%; material II, 0.14% +/- 0.03%; and material III, 1.17% +/- 0.08%. Twenty-four hours of setting did not significantly increase the setting expansion (p > 0.05). Mixing the three investments with distilled water drastically reduced setting expansions. A three-way analysis of variance was computed to evaluate the data and investigate significant interactive and main effects. The two-way interaction (material x liquid) was significant. The results were consistent with the concept of a higher silica-containing special liquid for material III compared with the other materials.