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首页> 外文期刊>The Journal of Prosthetic Dentistry >Fatigue testing and microscopic evaluation of post and core restorations under artificial crowns.
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Fatigue testing and microscopic evaluation of post and core restorations under artificial crowns.

机译：人工冠冠下桩核修复的疲劳测试和微观评估。

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STATEMENT OF PROBLEM: Coronoradicular reconstruction techniques of pulpless teeth include prefabricated post systems that retain a core material such as silver amalgam, composite, glass ionomer, or modified glass ionomer cement. Mechanical properties of these materials are critical to sustain masticatory forces. PURPOSE: This in vitro study compared the mechanical resistance of 3 core materials (silver amalgam, composite, and silver-reinforced glass ionomer) under masticatory conditions. MATERIAL AND METHODS: Industrially fabricated teeth were used and a total of 75 specimens were divided into 3 groups of 25 specimens. Titanium canal posts were placed, followed by core buildups in amalgam, composite, or glass ionomer. Teeth were prepared for full cast crowns and the crowns were fabricated and cemented with glass ionomer cement. Twenty specimens from each group were placed in a mastication simulator cyclically loading the teeth with a 400 N force for 1.5 million cycles. The 5 remaining specimens were used as controls. Teeth were sectioned and observed macroscopically and microscopically to determine the rate of defects for each material. Observed defects were verified with the Kruskal-Wallis test. The 3 core materials were ranked with the Tukey multiple comparison test. RESULTS: Significant differences of mechanical behavior were found for the 3 materials. At P <.01, silver amalgam was significantly superior to composite and glass ionomer. Composite was significantly superior to glass ionomer. CONCLUSION: Cores fabricated with amalgam had the lowest rate of defects when tested under artificial crowns. Glass ionomer, when used as a core material under artificial crowns, showed the highest rate of defects after an instantaneous load of 400 N for a 1,500,000 repetition cycle.
机译：问题陈述：无牙髓冠状动脉重建技术包括预制的桩后系统，该系统保留核心材料，例如银汞合金，复合材料，玻璃离聚物或改性玻璃离聚物水泥。这些材料的机械性能对于维持咀嚼力至关重要。目的：这项体外研究比较了咀嚼条件下三种核心材料（银汞合金，复合材料和银增强玻璃离聚物）的机械阻力。材料与方法：使用工业制造的牙齿，将75个标本分为3组，每组25个标本。放置钛管柱，然后在汞齐，复合材料或玻璃离聚物中形成芯层。准备用于完整铸造牙冠的牙齿，并制造牙冠并用玻璃离聚物粘固剂固结。将每组的20个标本放在咀嚼模拟器中，以400 N的力周期性地加载牙齿150万次循环。剩下的5个样本用作对照。牙齿被切开并进行宏观和微观观察以确定每种材料的缺陷率。观察到的缺陷用Kruskal-Wallis检验进行了验证。用Tukey多重比较测试对这3种核心材料进行了排名。结果：3种材料的机械性能差异显着。在P <.01时，银汞合金明显优于复合材料和玻璃离聚物。复合材料明显优于玻璃离聚物。结论：用人造汞合金制成的芯在人造牙冠下测试时缺陷率最低。玻璃离聚物在人造冠下用作芯材时，在1,500,000个重复循环的400 N瞬时载荷下显示出最高的缺陷率。

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