The influence of multiple firing on thermal contraction of ceramic materials used for the fabrication of layered all-ceramic dental restorations
The influence of multiple firing on thermal contraction of ceramic materials used for the fabrication of layered all-ceramic dental restorations
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DOI：
10.1016/j.dental.2004.08.006
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发表时间：
2005-06-01
期刊：
影响因子：
5
通讯作者：
Feilzer, AJ
中科院分区：
文献类型：
--
作者：
Isgró, G;Kleverlaan, CJ;Feilzer, AJ
目标。在层状全陶瓷修复体的生产过程中，可能会形成瞬态和/或残余热应力，这可能会影响修复体的寿命。本研究的目的是评估多次烧制对贴面瓷和陶瓷芯的热行为的影响。测试的材料有：Empress 2 Core， Empress 2 Veneer和Eris玻璃陶瓷，Carrara Vincent和一种实验性白晶石贴面瓷，Vitadur-Alpha铝瓷，以及两种为钛设计的瓷（即Duceratin牙本质和搪瓷）。用膨胀仪测量了材料的热收缩系数。在冷却过程中测量热收缩系数，并在450-20℃的温度范围内通过线性回归计算。采用单、双向方差分析及Tukey事后检验进行统计分析。反复烧制对皇后2号单板、卡拉拉-文森特瓷和实验瓷的热收缩系数有影响。皇后2芯的热收缩系数与Vitadur-Alpha、Carrara Vincent、实验瓷和Duceratin瓷存在显著差异。皇后2号单板和Eris的收缩系数与皇后2号芯的收缩系数最接近。皇后2芯和厄里斯玻璃陶瓷、铝瓷和杜塞拉丁瓷经反复烧制后的热稳定性优于白白石瓷。综上所述，由于玻璃陶瓷材料的热稳定性，层状全陶瓷修复体可能具有更好的性能。(c) 2004年牙科材料学会。Elsevier Ltd.出版。版权所有。
Objectives. During the production of layered all-ceramic restorations transient and/or residual thermal stresses may be formed which may affect a restoration's longevity. The aim of this study was to evaluate the influence of multiple firings on the thermal behavior of veneering porcelains and a ceramic core.Methods. The materials tested were: Empress 2 Core, Empress 2 Veneer and Eris glass-ceramics, Carrara Vincent and an experimental leucite-based veneering porcelain, Vitadur-Alpha aluminous porcelain, and two porcelains designed for titanium (i.e. Duceratin Dentine and Enamel). The thermal contraction coefficient of the materials was measured by means of dilatometery. The thermal contraction coefficient was measured during cooling and calculated over the temperature range of 450-20 degrees C by linear regression. One and two-way analysis of variance together with Tukey post-hoc tests were used as statistical analysis.Results. Repeated firing affects the thermal contraction coefficients of Empress 2 Veneer, Carrara Vincent porcelain and the experimental porcelain. The thermal contraction coefficients of Empress 2 Core were significantly different from Vitadur-Alpha, Carrara Vincent, experimental porcelain, and Duceratin porcelains. The contraction coefficients of Empress 2 Veneer and Eris were closest to that of Empress 2 Core.Significance. The Empress 2 Core and Eris glass-ceramics, the aluminous porcelain and Duceratin porcelains showed better thermal stability after repeated firing than leucite porcelains. It can be concluded that due to the thermal stability of glass-ceramic materials, layered all-ceramic restorations of these materials may perform better. (c) 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.