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Thermal dimensional behavior of dental ceramics

机译：牙科陶瓷的热尺寸行为

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The aim of this study was to characterize the relation of dimensional changes of dental ceramic materials as function of temperature. The thermal dimensional behavior of one glass ceramic core, four commercially available veneering porcelains and two experimental veneering porcelain materials was determined on cooling from 450degreesC to 20degreesC by means of a vertical differential pushrod thermal dilatometer. The thermal dimensional behavior of the ceramic materials was expressed in three different ways: as linear relation with a linear line fitting procedure; as non-linear relation by a quadratic curve fitting procedure and according to ISO 9693 by a thermal expansion coefficient. For all ceramic materials except the one consisting of aluminum oxide fillers, the thermal dimensional behavior is best described with the polynomial function: Deltal/l = C + alpha(1)T + alpha(2)T(2). The description of the thermal expansion coefficient according to the ISO standard on metal is not appropriate for the prediction of a thermal incompatibility of ceramic materials. Except for Vitadur Alpha, the ceramics materials tested showed non-linear expansion; their thermal dimensional behavior can be best described according to the quadratic relation method, second by the linear relation, third as recommended by ISO. (C) 2003 Elsevier Ltd. All rights reserved. [References: 16]
机译：这项研究的目的是表征牙科陶瓷材料的尺寸变化与温度的关系。借助于垂直差示推杆热膨胀计，在从450℃冷却至20℃的条件下，确定了一个玻璃陶瓷芯，四种市售贴面瓷和两种实验贴面瓷材料的热尺寸行为。陶瓷材料的热尺寸行为用三种不同的方式表示：以线性关系和线性拟合程序线性关系;以线性关系拟合线性关系。通过二次曲线拟合程序确定为非线性关系，并根据ISO 9693通过热膨胀系数确定为非线性关系。对于除氧化铝填料以外的所有陶瓷材料，最好用多项式函数来描述热尺寸行为：Deltal / l = C + alpha（1）T + alpha（2）T（2）。根据ISO标准对金属的热膨胀系数的描述不适用于预测陶瓷材料的热不相容性。除Vitadur Alpha以外，测试的陶瓷材料均显示非线性膨胀。它们的热尺寸行为可以根据二次关系方法来最好地描述，其次是线性关系，其次是ISO的建议。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：16]

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