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首页> 外文期刊>The Journal of Prosthetic Dentistry >The influence of short-heating-cycle investments on the quality of commercially pure titanium castings.
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The influence of short-heating-cycle investments on the quality of commercially pure titanium castings.

机译：短加热周期投资对商业纯钛铸件质量的影响。

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STATEMENT OF PROBLEM: A new short-cycle, spinel-based investment was developed to minimize the long heating cycle generally required for conventional investments for titanium castings, but the quality of castings made using this material has yet to be evaluated. PURPOSE: The purpose of this study was to compare the Vickers hardness, castability, surface roughness, in vitro marginal misfit, and internal porosity of castings made using silica phosphate-based and spinel-based investments. MATERIAL AND METHODS: The specimens were commercially pure titanium cast using silica phosphate-based investment, Rematitan Plus (RP), and spinel-based investments, Rematitan Ultra (RU) or short-heat-cycle Trinell (TR). Disc-shaped patterns (6 x 3 mm) were cast, and Vickers hardness was measured at the surface, and 50, 100, 150, and 200 mum beneath the surface (n=10). Microstructure was analyzed by optical microscopy (x100). Mesh patterns (14 x 14 x 0.5 mm) were used for castability testing (n=10). Surface roughness (Ra) was measured on disc-shaped patterns (13 x 3 mm) with a profilometer (n=8). Wax copings were cast, screwed to implant abutments, and the marginal misfit was measured using image analysis software (n=10). Internal porosity of the copings was evaluated by density comparisons (n=10). Hardness data were analyzed by 2-way ANOVA and the Tukey HSD test. Castability, surface roughness, and marginal misfit were analyzed by 1-way ANOVA and the Tukey HSD test, and internal porosity by Kruskal-Wallis and Student-Newman-Keuls tests (alpha=.05). RESULTS: RP had the highest hardness values at the surface and 50 mum beneath, but the hardness values of TR, RU, and RP were statistically equivalent at 100, 150, and 200 mum. Significant differences were seen when comparing RU and TR with RP for castability (P<.001), surface roughness (P<.001), and marginal misfit (P<.001). No significant differences were seen for internal porosity. CONCLUSIONS: The quality of castings made from the new investment, TR, was similar to the quality of those made using the conventional spinel-based investment, RU, and superior to those made using RP.
机译：问题陈述：开发了一种新的基于尖晶石的短周期投资，以最大程度地减少钛铸件常规投资通常需要的较长加热周期，但是使用这种材料制成的铸件的质量尚待评估。目的：本研究的目的是比较使用基于二氧化硅和尖晶石的投资制成的铸件的维氏硬度，可铸性，表面粗糙度，体外边缘失配和内部孔隙率。材料和方法：样品是商业纯钛铸件，使用的是基于磷酸硅的产品Rematitan Plus（RP）和基于尖晶石的产品Rematitan Ultra（RU）或短热周期Trinell（TR）。铸造盘形图案（6×3mm），并在表面处以及在表面下方50、100、150和200μm（n ＝ 10）处测量维氏硬度。通过光学显微镜（×100）分析微观结构。网状图案（14 x 14 x 0.5毫米）用于可铸性测试（n = 10）。用轮廓仪（n ＝ 8）在圆盘形图案（13×3mm）上测量表面粗糙度（Ra）。铸造蜡盖，拧入种植体基台，并使用图像分析软件（n = 10）测量边缘不匹配。顶盖的内部孔隙率通过密度比较进行评估（n = 10）。硬度数据通过2通ANOVA和Tukey HSD测试进行分析。通过1向ANOVA和Tukey HSD测试分析了可铸性，表面粗糙度和边缘失配，并通过Kruskal-Wallis和Student-Newman-Keuls测试分析了内部孔隙率（alpha = .05）。结果：RP在表面和下方50微米处具有最高的硬度值，但TR，RU和RP的硬度值在100、150和200微米处具有统计学意义。当比较RU和TR与RP的可铸性（P <.001），表面粗糙度（P <.001）和边际失配（P <.001）时，观察到显着差异。内部孔隙率没有显着差异。结论：新投资TR制成的铸件质量与使用常规尖晶石型投资RU制成的铸件质量相似，并且优于RP铸件。

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