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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
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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.
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