Crack tip fracture toughness of base glasses for dental restoration glass-ceramics using crack opening displacements.
Crack tip fracture toughness of base glasses for dental restoration glass-ceramics using crack opening displacements.
复制标题
使用裂纹张开位移测量用于牙科修复玻璃陶瓷的基体玻璃的裂纹尖端断裂韧性。
DOI：
10.1016/j.jmbbm.2011.04.016
复制
发表时间：
2011
影响因子：
3.9
通讯作者：
V. Rheinberger
中科院分区：
文献类型：
--
作者：
J. Deubener;M. Höland;W. Höland;N. Janakiraman;V. Rheinberger
临界应力强度因子，也被称为裂纹尖端韧性Ktip，确定了三个基础玻璃，这是用于制造玻璃陶瓷。玻璃包括用于二硅酸锂玻璃陶瓷的基础玻璃、用于氟磷灰石玻璃陶瓷的基础玻璃和用于白榴石玻璃陶瓷的基础玻璃。这些玻璃陶瓷以生物材料的形式广泛应用于牙科修复医学。在实验条件下，裂纹尖端韧性由裂纹张开位移剖面建立。裂纹是由维氏压痕产生的。裂纹尖端韧性参数确定的三种玻璃陶瓷的差异相当显着。二硅酸锂基玻璃和白榴石基玻璃的裂尖参数均高于氟磷灰石基玻璃。这最后一种材料显示出玻璃包玻璃相分离。对结果的讨论清楚地表明，液滴玻璃相比玻璃基质更软。因此，作者得出结论，玻璃的化学性质和裂纹尖端参数之间存在着直接的关系。
The critical stress intensity factor, also known as the crack tip toughness Ktip, was determined for three base glasses, which are used in the manufacture of glass-ceramics. The glasses included the base glass for a lithium disilicate glass-ceramic, the base glass for a fluoroapatite glass-ceramic and the base glass for a leucite glass-ceramic. These glass-ceramic are extensively used in the form of biomaterials in restorative dental medicine. The crack tip toughness was established by using crack opening displacement profiles under experimental conditions. The crack was produced by Vickers indentation. The crack tip toughness parameters determined for the three glass-ceramics differed quite significantly. The crack tip parameters of the lithium disilicate base glass and the leucite base glass were higher than that of the fluoroapatite base glass. This last material showed glass-in-glass phase separation. The discussion of the results clearly shows that the droplet glass phase is softer than the glass matrix. Therefore, the authors conclude that a direct relationship exists between the chemical nature of the glasses and the crack tip parameter.