Tribological behaviour of unveneered and veneered lithium disilicate dental material
authors Figueiredo-Pina, CG; Patas, N; Canhoto, J; Claudio, R; Olhero, SM; Serro, AP; Ferro, AC; Guedes, M
nationality International
journal JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
author keywords Sliding wear; Biotribology; Lithium disilicate glass-ceramic; Fluorapatite veneer; Teeth; Surface charge; Wettability
keywords GLASS-CERAMICS; WEAR BEHAVIOR; TOOTH ENAMEL; RESTORATION; FRICTION
abstract The friction and wear behaviour of a lithium disilicate dental ceramic against natural dental enamel is studied, including the effect of the presence of a fluorapatite veneering upon the tribological properties of the material. The tribological behaviour was assessed using reciprocating pin-on-plate test configuration, at pH 3.and pH 7. The surface energy of the plates was determined, as well as the zeta potential of fluorapatite, lithium disilicate and enamel particles in artificial saliva. It was found that the friction and wear behaviour of the tested enamel/plate material tribocouples is less severe in unveneered plates. Initial surface roughness of the plate does not affect wear results. However the topography of the resulting wear track affects the corresponding wear loss: a smoother final wear track is associated with lower wear. The surface topography of the wear track, and thus the tribological performance of the tested materials, is very sensitive to the pH of the sliding solution. This is because the dissolution trend, wettability and surface charge of the used materials are pH dependent. Overall friction and wear are higher under basic pH conditions, especially when plates are veneered. A wear model is proposed that correlates the effect of the described parameters with the observed tribological behaviour at pH 7. Attained results show that fluorapatite coating of lithium disilicate dental crowns affects tooth/crown wear behaviour, resulting in increased wear of both the artificial crown and the opposing natural teeth. Coating should therefore be avoided in occlusal crown surfaces. (C) 2015 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1751-6161
year published 2016
volume 53
beginning page 226
ending page 238
digital object identifier (doi) 10.1016/j.jmbbm.2015.08.007
web of science category Engineering, Biomedical; Materials Science, Biomaterials
subject category Engineering; Materials Science
unique article identifier WOS:000366226500021
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journal analysis (jcr 2019):
journal impact factor 3.372
5 year journal impact factor 3.622
category normalized journal impact factor percentile 60.428
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