Surface smoothness and marginal fit with phosphate-bonded investments.
Surface smoothness and marginal fit with phosphate-bonded investments.
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表面光滑度和与磷酸盐粘合投资的边际配合。
DOI：
10.1016/0022-3913(79)90038-6
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
A. Caputo
中科院分区：
文献类型：
--
作者：
J. Cooney;T. M. Doyle;A. Caputo
对两种磷酸盐结合剂和一种硫酸钙结合剂对金铸件的表面光滑度和边际拟合度进行了评价。对每个磷酸盐键合投资的改进技术也进行了评估，其中硅溶胶不被稀释，并且减少了搅拌时间。本研究的结果得出以下结论：1。四种磷酸盐键合方法的边际拟合效果相互比较，优于硫酸钙投资法。2. 在磷酸盐结合熔模中，铸件表面出现结节的现象更为普遍。然而，这种影响在统计学上并不显著。3. 对铸件粗糙度的临床评估表明，所有的测试方法都产生了临床可接受的铸件。4. 五名牙医的目视观察显示，其中一种磷酸盐粘合投资（陶黄金）的推荐和改进技术比任何其他投资测试产生更光滑的表面。扫描电子显微镜照片（X600）的评级显示，任何铸件之间的表面粗糙度没有差异。因此，投资类型或技术与表面粗糙度之间没有确定的关系。5. 通过临床观察或扫描电子显微镜摄影评估的表面粗糙度与铸件的边缘配合之间没有相关性。
Two phosphate-bonded investments and one calcium sulfate investment were evaluated for the surface smoothness and marginal fit they impart to gold castings. A modified technique was also evaluated for each phosphate-bonded investment, where the silica sol was not diluted and the spatulation time was reduced. The results of this study lead to the following conclusions: 1. The marginal fits obtained with all four phosphate-bonded methods were comparable to each other and superior to that obtained with the calcium sulfate investment. 2. The presence of nodules on the surface of the castings was more prevalent with the phosphate-bonded investments. However, this effect was not statistically significant. 3. Clinical assessment of the roughness of the castings revealed that all the methods tested produced clinically acceptable castings. 4. Visual observation by five dentists revealed that both the recommended and modified techniques for one of the phosphate-bonded investments (Ceramigold) produced a smoother surface than any other investment tested. Rating of scanning electron microscope photographs (X600) revealed no difference in the surface roughness between any of the castings. Consequently, no definitive relation between investment type or technique and surface roughness was established. 5. No correlation was demonstrated between surface roughness, as evaluated by either clinical observation or scanning electron microscope photography, and marginal fit of the castings.