Effect of sintering parameters on phase evolution and strength of dental lithium silicate glass-ceramics

Dental Materials : Official Publication of the Academy of Dental Materials
Ulrich LohbauerKatrin Hurle

Abstract

With the establishment of CAD/CAM technology, competing lithium silicate based formulations have been introduced for clinical use, but little is known about their phase composition. Here we investigate a commercially available SiO2-Al2O3-K2O-Li2O-P2O5-ZrO2 system to evaluate the crystal phase evolution during the second heat treatment by changing the main crystallization parameters. With a focus on the final stage of crystallization, we characterized the dimensional changes in the crystallographic structure of the residual Li2SiO3 and the lithium orthophosphate (Li3PO4) phases with variations in crystallization parameters, i.e. time, temperature and cooling rate over the range of the glass transition temperature Tg. The phase fractions (crystalline and glass) and the sizes of coherent scattering domains (CSDs) were resolved by means of quantitative X-Ray Diffraction using Rietveld refinement combined with an external standard method (G-factor). Biaxial flexure testing was conducted to evaluate the influence of crystallization parameters on the characteristic strength and natural defect distribution. An increase in crystallization temperature from 840 to 880°C resulted in a significant reduction of the Li2Si2O5 content, which in...Continue Reading

Citations

Mar 1, 2020·Materials·Le FuWei Xia
Aug 1, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Liliana PorojanSorin-Daniel Porojan

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