| Effect of elastic modulus mismatch on failure behaviour of glass ionomer cement under Hertzian indentation. | |
| | |
MedLine Citation:
|
PMID: 22130463 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
OBJECTIVE: To investigate the effect of the substrate: coating elastic modulus ratio on the failure behaviour of glass ionomer cement (GIC) under Hertzian indentation. METHODS: GIC (Amalgomer CR, Advanced Healthcare, Tonbridge, Kent, UK) discs, 2mm thick and 10mm diameter, were randomly divided into 11 groups, 10-22 specimens for each group, and stored at 37°C in artificial saliva for 7days. Discs were tested resting freely on 11 substrate materials at 23°C in air by loading centrally through a 20mm diameter hard steel ball at a crosshead speed of 0.2mm/min. The elastic moduli of the substrates (E(s)) and the coating GIC (E(c)) were first measured with a method similar to that of the Hertzian indentation, except for the three harder materials: amalgam, Al6061 and stainless steel 304. The failure load at the first crack was recorded with the aid of acoustic emission detection. Fracture surfaces were observed by SEM. RESULTS: E(s) values ranged from 0.09 to 210GPa; E(c) was 7.7GPa. Failure load generally increased with E(s) at first and then became relatively stable; the turning point occurred for E(s)/E(c)=1. Bottom surface-initiated radial cracking was the principal failure mode on softer substrates (E(s)/E(c)<1), while top surface conical cracking usually occurred on harder substrates (E(s)/E(c)≥1). CONCLUSION: The elastic modulus ratio, substrate: coating, is a controlling factor for both the failure mode and load for the coating material under Hertzian indentation. |
| | |
Authors:
|
Yan Wang; B W Darvell |
Related Documents
:
|
21732113 - Stability of dental implants after irradiation with an 830-nm low-level laser: a double... 21564113 - Glass-ionomer cement restorative materials: a sticky subject? 11326503 - Bond strength of dual-cured resin cements to human teeth. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-11-28 |
Journal Detail:
|
Title: Dental materials : official publication of the Academy of Dental Materials Volume: - ISSN: 1879-0097 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
|
Created Date: 2011-12-1 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
|
Department of Prosthodontics, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China; Dental Materials Science, Faculty of Dentistry, Kuwait University, Kuwait. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Food safety implications of ochratoxin A in animal-derived food products.
Next Document: Retentive forces and fatigue resistance of thermoplastic resin clasps.