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首页> 外文期刊>The Journal of Prosthetic Dentistry >Diametral and compressive strength of dental core materials.
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Diametral and compressive strength of dental core materials.

机译：牙芯材料的径向和抗压强度。

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STATEMENT OF PROBLEM: Strength greatly influences the selection of core materials. Many disparate material types are now recommended for use as cores. Cores must withstand forces due to mastication and parafunction for many years. PURPOSE: This study compared the compressive and diametral tensile strengths of 8 core materials of various material classes and formulations (light-cured hybrid composite, autocured titanium containing composite, amalgam, glass ionomer, glass ionomer cermet, resin-modified glass ionomer, and polyurethane). MATERIAL AND METHODS: Materials were manipulated according to manufacturers' instructions for use as cores. Mean compressive and diametral strengths with associated standard errors were calculated for each material (n = 10). Analyses of variance were computed (P <.0001) and multiple comparisons tests discerned many differences among materials. RESULTS: Compressive strengths varied widely from 61.1 MPa for a polyurethane to 250 MPa for a resin composite. Diametral tensile strengths ranged widely from 18.3 MPa for a glass ionomer cermet to 55.1 MPa for a resin composite. Some resin composites had compressive and tensile strengths equal to those of amalgam. CONCLUSION: Light-cured hybrid resin composites were stronger than autocured titanium containing composites. The strengths of glass ionomer-based materials and of a polyurethane material were considerably lower than for resin composites or amalgam.
机译：问题陈述：强度极大地影响了核心材料的选择。现在建议将许多不同的材料类型用作芯。芯必须承受多年的咀嚼和超功能作用力。目的：本研究比较了八种不同材料类别和配方（轻固化混合复合材料，自固化含钛复合材料，汞齐，玻璃离聚物，玻璃离聚物金属陶瓷，树脂改性玻璃离聚物和聚氨酯）的8种芯材的压缩和径向拉伸强度）。材料和方法：根据制造商的说明对材料进行处理，以用作芯子。计算每种材料的平均抗压强度和径向强度以及相关的标准误差（n = 10）。计算了方差分析（P <.0001），多次比较测试发现了材料之间的许多差异。结果：抗压强度变化很大，从聚氨酯的61.1 MPa到树脂复合材料的250 MPa。径向拉伸强度的范围从玻璃离聚物金属陶瓷的18.3 MPa到树脂复合材料的55.1 MPa不等。一些树脂复合材料的抗压强度和拉伸强度等于汞齐。结论：光固化混合树脂复合材料比自固化含钛复合材料强。玻璃离聚物基材料和聚氨酯材料的强度明显低于树脂复合材料或汞合金的强度。

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