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Surface Characterization and Conductivity of Two Types of Lithium-Based Glass Ceramics after Accelerating Ageing

Jakovac, Marko; Klaser, Teodoro; Radatović, Borna; Skoko, Željko; Pavić, Luka; Žic, Mark (2020) Surface Characterization and Conductivity of Two Types of Lithium-Based Glass Ceramics after Accelerating Ageing. Materials, 13 (24). ISSN 1996-1944

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Abstract

In this study, two different dental ceramics, based on zirconia-reinforced lithium-silicate (LS1) glass-ceramics (Celtra Duo, Dentsply Sirona, Bensheim, Germany) and lithium disilicate (LS2) ceramics (IPS e.max CAD, Ivoclar, Vivadent, Schaan, Liechtenstein) were examined. They were tested prior to and after the crystallization by sintering in the dental furnace. Additionally, the impact of ageing on ceramic degradability was investigated by immersing it in 4% acetic acid at 80 ◦C for 16 h. The degradability of the materials was monitored by Impedance Spectroscopy (IS), X-Ray Powder Diffraction (XRPD), and Field Emission Scanning Electron Microscope (FE-SEM) techniques. It was detected that LS2 (vs. LS1) samples had a lower conductivity, which can be explained by reduced portions of structural defects. XRPD analyses also showed that the ageing increased the portion of defects in ceramics, which facilitated the ion diffusion and degradation of samples. To summarize, this study suggests that the non-destructive IS technique can be employed to probe the ageing properties of the investigated LS1 and LS2 ceramics materials.

Item Type: Article
Uncontrolled Keywords: glass ceramics ; lithium disilicate ; zirconia-reinforced lithium silicate ; degradation ; ageing ; impedance ; conductivity ; XRPD ; SEM ; acetic acid
Subjects: BIOMEDICINE AND HEALTHCARE > Dental Medicine
Divisions: Division of Materials Physics
Depositing User: Mark Žic
Date Deposited: 18 Jan 2021 09:53
Last Modified: 18 Jan 2021 09:55
URI: http://fulir.irb.hr/id/eprint/6166
DOI: 10.3390/ma13245632

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