Fairhurst C W, Anusavice K J, Hashinger D T, Ringle R D, Twiggs S W
J Biomed Mater Res. 1980 Jul;14(4):435-46. doi: 10.1002/jbm.820140410.
The effect of thermal coefficient of expansion (alpha) mismatch on porcelain-metal bonding is frequently referred to in the dental literature. Thermally induced stresses may develop at metal-porcelain system interfaces due to differences in the coefficients of thermal expansion of the porcelains, metals, and metal oxides. The objective of this research is to characterize alloy and porcelain expansion behavior as a first step in developing a more specific definition of thermal compatibility. It is clear from comparisons of porcelain data and alloy data that the porcelain has expansion characteristics which are quite different from those of the alloys. The overall differences in values between these alloys and porcelains constitute a mismatch. First run dilatometric heating measurements for porcelain yield large differences between delta L/L and alpha values as compared to cooling measurements. For a comparison of alloy and porcelain expansion characteristics, data should be obtained at several temperatures up to the glass transition temperature (Tg) of the porcelain.
热膨胀系数（α）不匹配对烤瓷熔附金属的影响在牙科文献中经常被提及。由于瓷、金属和金属氧化物热膨胀系数的差异，在金属 - 瓷系统界面可能会产生热致应力。本研究的目的是表征合金和瓷的膨胀行为，作为制定更具体热相容性定义的第一步。从瓷数据和合金数据的比较中可以清楚地看出，瓷具有与合金截然不同的膨胀特性。这些合金和瓷之间数值的总体差异构成了不匹配。与冷却测量相比，瓷的首次膨胀测量产生的ΔL/L和α值之间存在很大差异。为了比较合金和瓷的膨胀特性，应在高达瓷的玻璃化转变温度（Tg）的几个温度下获取数据。
