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Open AccessArticle

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

1
Department of Prosthodontics, School of Dental Medicine, University Zagreb, 10000 Zagreb, Croatia
2
Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
3
Center for Excellence for Advanced Materials and Sensing Devices, Institute of Physics, 10000 Zagreb, Croatia
4
Ruđer Bošković Institute, P.O. Box 180, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5632; https://doi.org/10.3390/ma13245632
Received: 20 November 2020 / Revised: 6 December 2020 / Accepted: 7 December 2020 / Published: 10 December 2020
(This article belongs to the Special Issue Bioactive Materials in Dentistry)
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. View Full-Text
Keywords: glass ceramics; lithium disilicate; zirconia-reinforced lithium silicate; degradation; ageing; impedance; conductivity; XRPD; SEM; acetic acid glass ceramics; lithium disilicate; zirconia-reinforced lithium silicate; degradation; ageing; impedance; conductivity; XRPD; SEM; acetic acid
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MDPI and ACS Style

Jakovac, M.; Klaser, T.; Radatović, B.; Skoko, Ž.; Pavić, L.; Žic, M. Surface Characterization and Conductivity of Two Types of Lithium-Based Glass Ceramics after Accelerating Ageing. Materials 2020, 13, 5632. https://doi.org/10.3390/ma13245632

AMA Style

Jakovac M, Klaser T, Radatović B, Skoko Ž, Pavić L, Žic M. Surface Characterization and Conductivity of Two Types of Lithium-Based Glass Ceramics after Accelerating Ageing. Materials. 2020; 13(24):5632. https://doi.org/10.3390/ma13245632

Chicago/Turabian Style

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, no. 24: 5632. https://doi.org/10.3390/ma13245632

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