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首页> 外文期刊>The Journal of Prosthetic Dentistry >Influence of recasting palladium-silver alloy on the fit of crowns with different marginal configurations.
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Influence of recasting palladium-silver alloy on the fit of crowns with different marginal configurations.

机译：重铸钯银合金对不同边缘构型的冠冠配合的影响。

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STATEMENT OF PROBLEM: Dental laboratories may occasionally recast previously cast dental alloy to produce a prosthesis, but this process may have a negative influence on marginal adaptation. PURPOSE: The aim of this study was to evaluate the cervical and internal fit of complete metal crowns that were cast and recast using palladium-silver alloy and 3 different marginal configurations: straight shoulder, 20-degree bevel shoulder, and 45-degree chamfer. MATERIAL AND METHODS: Thirty aluminum dies were made, 10 for each marginal configuration. Each group of 10 was further divided into 2 subgroups (n=5), according to the alloy (Pors-on 4) casting history. The dies were waxed using a cylindrical metal matrix to standardize the thickness of the walls. The wax patterns were invested in a phosphate-bonded investment (Deguvest) and cast after heating in an oven (EDG), according to the manufacturer's instruction. The alloy was melted with an oxygen-gas heat source and cooled to room temperature after casting. Afterwards, the specimens were seated on the dies with a static load of 9 kgf for 1 minute. The marginal discrepancy was measured with a metric microscope, using a digital micrometer. All the measurements were done by the same operator. Each crown-die interface was measured 3 times on each of the 4 diametrically opposite points, for a total of 12 measurements for each specimen. Specimens were longitudinally sectioned to obtain 2 hemi-sections for internal discrepancy measurements, measured at 3 points: 1 in the center of the occlusal wall and 2 at each center of each axial wall. Three measurements were made for each point, for a total of 9 measurements per specimen. The results were submitted to parametric statistical 3-way analysis of variance followed by Tukey-Kramer HSD post hoc analysis (alpha=.05). RESULTS: The new alloy provided significantly better adaptation (P<.001) than the recast alloy for both marginal and internal discrepancy measurements. Marginal designs did not shown any statistical differences when the new metal was used. For recast metal, the straight shoulder showed significantly better adaptation (P<.001) than the 20-degree bevel shoulder and the 45-degree chamfered configurations, which were statistically similar to each other. CONCLUSION: The results of this study suggest that recasting procedures for crown fabrication should not be used with the palladium-silver alloy tested.
机译：问题陈述：牙科实验室有时可能会改铸先前铸造的牙科合金以生产假体，但是此过程可能会对边缘适应性产生负面影响。目的：本研究的目的是评估使用钯-银合金和3种不同边缘配置（直肩，20度斜角肩和45度倒角）铸造和铸造的完整金属冠的颈椎和内部适合度。材料与方法：制作了30个铝模，每个边缘配置10个。根据合金（Pors-on 4）的铸造历史，每10人一组又分为2个子组（n = 5）。使用圆柱形金属基体对模具进行打蜡，以标准化壁的厚度。根据制造商的说明，将蜡模投入磷酸盐粘结的涂料（Deguvest）中，并在烤箱（EDG）中加热后进行铸造。铸造后用氧气热源将合金熔化并冷却至室温。然后，将样品以9 kgf的静载荷在模具上放置1分钟。边缘差异使用公制显微镜，使用数字千分尺测量。所有测量均由同一操作员完成。在4个沿直径相对的点中的每个点上，对每个冠模界面进行了3次测量，每个样品共进行12次测量。对样品进行纵向切片，以得到2个用于内部差异测量的半切片，在3个点进行测量：1个在咬合壁的中心，2个在每个轴向壁的每个中心。每个点进行了三项测量，每个样本总共进行了9次测量。将结果提交给方差的参数统计三项分析，然后进行Tukey-Kramer HSD事后分析（alpha = .05）。结果：对于边缘和内部差异测量，新合金提供了比重铸合金更好的适应性（P <.001）。使用新金属时，边缘设计没有显示任何统计差异。对于重铸金属，笔直的肩部显示出比20度斜角肩部和45度倒角构型明显更好的适应性（P <.001），这在统计学上彼此相似。结论：这项研究的结果表明，用于皇冠制造的重铸程序不应与所测试的钯银合金一起使用。

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