Preparation of nepheline glass-ceramics for dental applications

被引：23

作者：

Hamawy, Esmat M. A. ^{[1
]}

El-Meliegy, Emad A. M. ^{[2
]}

机构：

[1] Natl Res Ctr, Glass Res Dept, Cairo 12622, Egypt

[2] Natl Res Ctr, Biomat Dept, Cairo 12622, Egypt

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2008年 / 112卷 / 02期

关键词：

Dental glass-ceramic; Nepheline; TiO2; catalyst; Uniform microstructure;

D O I：

10.1016/j.matchemphys.2008.05.079

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nepheline containing glass-ceramic with fine uniform microstructure was achieved from a glass composition midway between nepheline and anorthite for dental crown construction. The crystallization of nepheline solid solution was confirmed by the XRD as depicted by the cl-spacing lines at 3.45 and 3.34 angstrom. The incorporation of TiO2 reduces the softening and crystallization temperature and enhances the fineness. The prepared glass-ceramics displayed coefficients of thermal expansion in the range of 70-85 x 10(-7) K-1 (25-300 degrees C). The fact that insured good bonding between ceramic and metal components in dental prosthesis. The addition of CaO on the other hand, improves the dimensional stability and the chemical resistance. In addition, a deficiency in both Na2O and SiO2 and abundance of CaO and Al2O3 was detected by EDX analysis, the case confirming a coupled solid solution where Na+1Si+4 substitute Ca+2Al+3. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：432 / 435

页数：4

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