Understanding the mechanism for the mechanical property degradation of a lithium disilicate glass-ceramic by annealing.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29132098.
- Also identified by DOI 10.1016/j.jmbbm.2017.11.003.
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Abstract
Post-crystallization annealing above the T<sub>g</sub> was applied to a lithium disilicate glass-ceramic with microstructure consisting of glassy matrix and rod-like lithium disilicate crystals, effect of the annealing on the mechanical behavior was investigated. Flexural strength and VIF toughness of the glass-ceramic unexpectedly decreased after the annealing. The mechanical behavior variation was understood based on residual micro-stress analysis. Coefficient of thermal expansion for the glassy matrix presented a tendency to increase after the annealing, which would enlarge the thermal expansion mismatch between the glassy matrix and the lithium disilicate crystals. As a result, the residual micro-stresses in the glass-ceramic abnormally increased with increasing the annealing time. The mechanical property degradation was attributed to the annealing-induced increase of the residual micro-stresses.
Medical subject headings
- Ceramics
- Dental Porcelain
- Mechanical Phenomena