Abstract:
The purpose of this study was to determine the effects of synthesized sodalite zeolite infiltration achieved by a direct in-situ hydrothermal reaction followed by sintering process on the flexural strength and hardness of alumina and zirconia-toughened alumina (ZTA) frameworks. Ceramic core materials were prepared as disk-shaped specimens with 16 mm diameter and 1.2 +/- 0.2 mm thickness. The case study group was synthesized sodalite zeolite-infiltrated alumina (IA-SOD) and synthesized sodalite zeolite-infiltrated ZTA (IZ-SOD); and the control group was glass-infiltrated alumina (IA-glass) and glass infiltrated ZTA (IZ-glass). The biaxial flexural strength (piston-on-three-balls test) and Vickers micro hardness were compared among groups (n=10 specimens in each group). Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) were used to investigate the structural characteristics of specimens at the fracture and cross-sectional surfaces. For both IA-SOD and IZ-SOD, the biaxial flexural strength exceeded the required value of 100-150 MPa as specified by ISO 6872(2015), indicating their potential as all-ceramic core materials. The flexural strengths and Vickers microhardness of IZ-SOD were respectively 324.7 MPa and 1162 VHN, while these values were measured 233.6 MPa and 1013 VHN for IA-SOD. The mechanical properties and microstructure of core materials have been advocated as crucial to the clinical performance of all-ceramic dental restorations. This investigation provides data regarding the flexural strength, hardness and microstructure of partially sintered alumina and ZTA frameworks with synthesized sodalite zeolite infiltration. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source: CERAMICS INTERNATIONAL Author: Naji GAH, Omar RA, Yahya R, Dabbagh A Status: Full-text article available in Elsevier
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