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首页> 外文期刊>The Journal of Prosthetic Dentistry >Porosity of cpTi casting with four different casting machines.
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Porosity of cpTi casting with four different casting machines.

机译：四种不同铸造机的cpTi铸件的孔隙率。

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STATEMENT OF PROBLEM: Porosity is a well-known problem in dental titanium casting, resulting in inferior mechanical properties of dental restorations. PURPOSE: The aim of this study was to evaluate the porosity of cpTi castings produced with different casting machines. MATERIAL AND METHODS: Four groups of 20 rectangular (30 x 3 x 0.5 mm) wax patterns were fabricated. Group CyII was cast in a CyclarcII casting machine, Group DAM in a Dor-A-Matic, Group TiF in a Titec 201F, and Group ETi in an EasyTi with cpTi, according to manufacturers' instructions. Groups CyII, DAM and TiF were invested with magnesia based Titavest CB and Group ETi with Ticoat S+L silica based investment. The percentage porosity of each specimen was determined using standardized digital radiographs and calculated by quantitative image analysis procedure. The results were statistically analyzed by nonparametric Kruskal-Wallis test (alpha=.05). RESULTS: No statistical differences were found among the groups tested; nevertheless, pore distribution among the specimens of the same group was inhomogeneous. The results show that the casting machines tested produced nonuniform porosity. CONCLUSIONS: Under the conditions of the present study, the type of casting machine does not significantly influence the internal porosity in cpTi castings.
机译：问题陈述：孔隙率是牙科钛铸造中的一个众所周知的问题，导致牙科修复体的机械性能较差。目的：本研究的目的是评估使用不同铸造机生产的cpTi铸件的孔隙率。材料和方法：制作了四组20个矩形（30 x 3 x 0.5 mm）蜡模。根据制造商的说明，将CyII组在CyclarcII铸造机中，在Dor-A-Matic中的DAM组，在Titec 201F中的TiF组，在使用cpTi的EasyTi中的ETi组中铸造。 CyII，DAM和TiF组是基于氧化镁的Titavest CB投资的，而ETi组是基于Ticoat S + L二氧化硅的投资。使用标准化的数字射线照片确定每个样品的孔隙率百分比，并通过定量图像分析程序进行计算。通过非参数Kruskal-Wallis检验（alpha = .05）对结果进行统计分析。结果：测试组之间未发现统计学差异;但是，同一组样品之间的孔分布是不均匀的。结果表明，所测试的铸造机产生了不均匀的孔隙率。结论：在本研究的条件下，铸造机的类型不会显着影响cpTi铸件的内部孔隙率。

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