Bowen Wang , Rawan Saad Alazwari , Shafique Ahmed , Zimeng Hu , Mike J. Cattell , Haixue Yan
{"title":"商用氧化锆生物陶瓷耐低温降解性的介电探测。","authors":"Bowen Wang , Rawan Saad Alazwari , Shafique Ahmed , Zimeng Hu , Mike J. Cattell , Haixue Yan","doi":"10.1016/j.dental.2024.04.008","DOIUrl":null,"url":null,"abstract":"<div><h3>Objectives</h3><p>To investigate the effect of the stability of oxygen vacancies on the low-temperature degradation (LTD) resistance of two kinds of commercial zirconia-based materials (3Y-TZP ceramics and Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites) via the dielectric probing methods.</p></div><div><h3>Methods</h3><p>The commercial 3Y-TZP ceramics and Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites were prepared via conventional solid-state methods. Density, phase content, microstructure, strain, and biaxial flexural strength (BFS) of two materials were investigated using Archimedes method, XRD, SEM, strain-electric field (S-E) loops and ball-on-ring methods, respectively. The concentration of oxygen vacancies before and after LTD of two materials were evaluated using dielectric probing and XPS methods.</p></div><div><h3>Results</h3><p>The XRD analysis revealed that compared to the 3Y-TZP ceramics, the Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites showed better LTD resistance, without clear LTD. The greater LTD resistance for Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites was associated with their stability of oxygen vacancies, by higher activation energy based on the dielectric measurements and XPS results. For the 3Y-TZP ceramics that underwent the tetragonal to the monoclinic phase transition during the LTD treatment, the concentration of their oxygen vacancies decreased after LTD. In addition, the Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites exhibited higher flexural strength and potential fracture toughness based on the BFS testing and strain vs electric field measurement results, indicating a great potential for use in fixed restorative dental applications.</p></div><div><h3>Significance</h3><p>This work suggested the stability of oxygen vacancies played a key role in the resistance to LTD. 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The concentration of oxygen vacancies before and after LTD of two materials were evaluated using dielectric probing and XPS methods.</p></div><div><h3>Results</h3><p>The XRD analysis revealed that compared to the 3Y-TZP ceramics, the Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites showed better LTD resistance, without clear LTD. The greater LTD resistance for Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites was associated with their stability of oxygen vacancies, by higher activation energy based on the dielectric measurements and XPS results. For the 3Y-TZP ceramics that underwent the tetragonal to the monoclinic phase transition during the LTD treatment, the concentration of their oxygen vacancies decreased after LTD. In addition, the Ce-TZP/Al<sub>2</sub>O<sub>3</sub> composites exhibited higher flexural strength and potential fracture toughness based on the BFS testing and strain vs electric field measurement results, indicating a great potential for use in fixed restorative dental applications.</p></div><div><h3>Significance</h3><p>This work suggested the stability of oxygen vacancies played a key role in the resistance to LTD. 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Dielectric probing of low-temperature degradation resistance of commercial zirconia bio-ceramics
Objectives
To investigate the effect of the stability of oxygen vacancies on the low-temperature degradation (LTD) resistance of two kinds of commercial zirconia-based materials (3Y-TZP ceramics and Ce-TZP/Al2O3 composites) via the dielectric probing methods.
Methods
The commercial 3Y-TZP ceramics and Ce-TZP/Al2O3 composites were prepared via conventional solid-state methods. Density, phase content, microstructure, strain, and biaxial flexural strength (BFS) of two materials were investigated using Archimedes method, XRD, SEM, strain-electric field (S-E) loops and ball-on-ring methods, respectively. The concentration of oxygen vacancies before and after LTD of two materials were evaluated using dielectric probing and XPS methods.
Results
The XRD analysis revealed that compared to the 3Y-TZP ceramics, the Ce-TZP/Al2O3 composites showed better LTD resistance, without clear LTD. The greater LTD resistance for Ce-TZP/Al2O3 composites was associated with their stability of oxygen vacancies, by higher activation energy based on the dielectric measurements and XPS results. For the 3Y-TZP ceramics that underwent the tetragonal to the monoclinic phase transition during the LTD treatment, the concentration of their oxygen vacancies decreased after LTD. In addition, the Ce-TZP/Al2O3 composites exhibited higher flexural strength and potential fracture toughness based on the BFS testing and strain vs electric field measurement results, indicating a great potential for use in fixed restorative dental applications.
Significance
This work suggested the stability of oxygen vacancies played a key role in the resistance to LTD. Optimizing the stability of the oxygen vacancies is key to the development of more reliable zirconia- based dental biomaterials with greater resistance to LTD.
期刊介绍：
Dental Materials publishes original research, review articles, and short communications.
Academy of Dental Materials members click here to register for free access to Dental Materials online.
The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology.
Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.
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