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Zirconia toughened mica glass ceramics for dental restorations

Gali, Sivaranjani and Ravikumar, K and Murthy, B V S and Basu, Bikramjit (2018) Zirconia toughened mica glass ceramics for dental restorations. In: DENTAL MATERIALS, 34 (3). E36-E45.

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Official URL: http://dx.doi.org/10.1016/j.dental.2018.01.009

Abstract

Objective. The objective of the present study is to understand the role of yttria stabilized zirconia (YSZ) in achieving the desired spectrum of clinically relevant mechanical properties (hardness, elastic modulus, fracture toughness and brittleness index) and chemical solubility of mica glass ceramics. Methods. The glass-zirconia mixtures with varying amounts of YSZ (0, 5, 10, 15 and 20 wt.%) were ball milled, compacted and sintered to obtain pellets of glass ceramic-YSZ composites. Phase analysis was carried out using X-ray diffraction and microstructural characterization with SEM revealed the crystal morphology of the composites. Mechanical properties such as Vickers hardness, elastic modulus, indentation fracture toughness and chemical solubility were assessed. Results. Phase analysis of sintered pellets of glass ceramic-YSZ composites revealed the characteristic peaks of fluorophlogopite (FPP) and tetragonal zirconia. Microstructural investigation showed plate and lath-like interlocking mica crystals with embedded zirconia. Vickers hardness of 9.2 GPa, elastic modulus of 125 GPa, indentation toughness of 3.6 MPa.m(1/2), and chemical solubility of 30 mu g/cm(2) (well below the permissible limit) were recorded with mica glass ceramics containing 20 wt.% YSZ. (C) 2018 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for the article belong to ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 19 Mar 2018 18:29
Last Modified: 19 Mar 2018 18:29
URI: http://eprints.iisc.ac.in/id/eprint/59236

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