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-  2017 

可切削硅酸锂全瓷冠的力学差异性研究

DOI: doi:10.7507/1001-5515.201604055

Keywords: 可切削硅酸锂, 单层冠, 粘接, 有限元分析, 应力

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Abstract:

可切削硅酸锂陶瓷具有很好的色泽和较高的抗弯强度,它既可用于单层冠,也可以用作氧化锆基底冠的饰面瓷,再通过烧结或者粘接方式合成全瓷冠。本文研究了单层冠、烧结双层冠和粘接双层冠等 3 种结构形式的全瓷冠修复体在典型载荷作用下应力分布差异。建立了下颌第一磨牙单层冠、烧结双层冠和粘接双层冠等 3 种全瓷冠的三维数值模型,分别对其施加垂直集中载荷和八点均布载荷两种典型载荷,通过数值计算分析 3 种全瓷冠各部分的应力极值和应力分布。结果表明,3 种瓷冠在两种载荷作用下的最大应力均小于材料的弯曲强度。烧结双层冠和粘接双层冠应力分布形式大体相同,与单层冠应力分布趋势不同。粘接双层冠与烧结双层冠相比,饰面瓷应力更大。在采用可切削硅酸锂陶瓷单层冠作为磨牙修复体时,在多次咀嚼载荷作用下高应力区可能导致全瓷冠的使用寿命缩短。与烧结双层冠相比,粘接双层冠的饰面瓷可能存在更大崩瓷的风险。本文结论可为可切削硅酸锂陶瓷材料在实际全瓷冠修复临床应用中提供参考意见

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