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Article: Corrosion resistance of iron-platinum magnets

TitleCorrosion resistance of iron-platinum magnets
Authors
KeywordsBreakaway force
Corrosion resistance
Iron-platinum
Magnets
Neodymium-iron-boron
pH
Issue Date2004
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent
Citation
Journal Of Dentistry, 2004, v. 32 n. 6, p. 423-429 How to Cite?
AbstractObjectives. The objective of this study was to investigate the corrosion resistance of the prototype iron-platinum (FePt) magnets and non-encapsulated neodymium-iron-boron (NdFeB) magnets in three different pH environments. Methods. The corrosion resistance of the magnets was studied using a corrosion indicator, the breakaway force. The breakaway forces of the magnets after immersion in three media, namely 1% lactic acid solution (pH=2.7), 0.1% sodium sulphide solution (pH=12) and adjusted artificial saliva (pH=6.8) were compared after 28 and 60-day periods. Results. By day 7, all NdFeB magnets dissolved completely in the acid medium, and they showed significantly lower breakaway forces at day 28 and day 60 in artificial saliva (90%, 69%) and in alkaline medium (67%, 42%). In contrast, the FePt magnets did not show a drop in the breakaway forces after immersion in acid or artificial saliva, although approximately half of the original breakaway forces were recorded at day 28 and day 60 after immersion in strong alkali. Conclusions. The new iron-platinum magnets, which require no yoke assembly or protective casing, has good corrosion resistance for the oral environment. If its retentive force can be improved without increasing its thickness (0.3 mm), then it will have distinct advantages for clinical use. © 2004 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/66812
ISSN
2015 Impact Factor: 3.109
2015 SCImago Journal Rankings: 1.029
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYiu, EYLen_HK
dc.contributor.authorFang, DTSen_HK
dc.contributor.authorChu, FCSen_HK
dc.contributor.authorChow, TWen_HK
dc.date.accessioned2010-09-06T05:49:33Z-
dc.date.available2010-09-06T05:49:33Z-
dc.date.issued2004en_HK
dc.identifier.citationJournal Of Dentistry, 2004, v. 32 n. 6, p. 423-429en_HK
dc.identifier.issn0300-5712en_HK
dc.identifier.urihttp://hdl.handle.net/10722/66812-
dc.description.abstractObjectives. The objective of this study was to investigate the corrosion resistance of the prototype iron-platinum (FePt) magnets and non-encapsulated neodymium-iron-boron (NdFeB) magnets in three different pH environments. Methods. The corrosion resistance of the magnets was studied using a corrosion indicator, the breakaway force. The breakaway forces of the magnets after immersion in three media, namely 1% lactic acid solution (pH=2.7), 0.1% sodium sulphide solution (pH=12) and adjusted artificial saliva (pH=6.8) were compared after 28 and 60-day periods. Results. By day 7, all NdFeB magnets dissolved completely in the acid medium, and they showed significantly lower breakaway forces at day 28 and day 60 in artificial saliva (90%, 69%) and in alkaline medium (67%, 42%). In contrast, the FePt magnets did not show a drop in the breakaway forces after immersion in acid or artificial saliva, although approximately half of the original breakaway forces were recorded at day 28 and day 60 after immersion in strong alkali. Conclusions. The new iron-platinum magnets, which require no yoke assembly or protective casing, has good corrosion resistance for the oral environment. If its retentive force can be improved without increasing its thickness (0.3 mm), then it will have distinct advantages for clinical use. © 2004 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdenten_HK
dc.relation.ispartofJournal of Dentistryen_HK
dc.rightsJournal of Dentistry. Copyright © Elsevier Ltd.en_HK
dc.subjectBreakaway forceen_HK
dc.subjectCorrosion resistanceen_HK
dc.subjectIron-platinumen_HK
dc.subjectMagnetsen_HK
dc.subjectNeodymium-iron-boronen_HK
dc.subjectpHen_HK
dc.subject.meshBoronen_HK
dc.subject.meshCorrosionen_HK
dc.subject.meshDental Stress Analysisen_HK
dc.subject.meshDenture Retention - instrumentationen_HK
dc.subject.meshHydrogen-Ion Concentrationen_HK
dc.subject.meshIronen_HK
dc.subject.meshLactic Aciden_HK
dc.subject.meshMagnetics - instrumentationen_HK
dc.subject.meshMaterials Testingen_HK
dc.subject.meshNeodymiumen_HK
dc.subject.meshPlatinumen_HK
dc.subject.meshSaliva, Artificialen_HK
dc.subject.meshSulfidesen_HK
dc.titleCorrosion resistance of iron-platinum magnetsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0300-5712&volume=32&spage=423&epage=429&date=2004&atitle=Corrosion+resistance+of+iron-platinum+magnetsen_HK
dc.identifier.emailChu, FCS: cschu@hkucc.hku.hken_HK
dc.identifier.emailChow, TW: twchow@hku.hken_HK
dc.identifier.authorityChu, FCS=rp00035en_HK
dc.identifier.authorityChow, TW=rp00009en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jdent.2004.02.007en_HK
dc.identifier.pmid15240060-
dc.identifier.scopuseid_2-s2.0-3042710787en_HK
dc.identifier.hkuros90183en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3042710787&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume32en_HK
dc.identifier.issue6en_HK
dc.identifier.spage423en_HK
dc.identifier.epage429en_HK
dc.identifier.isiWOS:000222813000001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridYiu, EYL=36762804600en_HK
dc.identifier.scopusauthoridFang, DTS=7202133694en_HK
dc.identifier.scopusauthoridChu, FCS=7201881096en_HK
dc.identifier.scopusauthoridChow, TW=7203012369en_HK

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