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Article: Effect of burn-out temperature on magnetic keepers in cast noble metal alloy posts

TitleEffect of burn-out temperature on magnetic keepers in cast noble metal alloy posts
Authors
Issue Date2009
PublisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/prosdent
Citation
Journal Of Prosthetic Dentistry, 2009, v. 101 n. 1, p. 66-72 How to Cite?
AbstractStatement of problem: Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose: The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods: One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results: Retention of the keepers was significantly higher at lower burn-out temperatures (P<.001). The retention of the keepers became unpredictable and immediate failures were observed at a burn-out temperature of 700°C. Oxide formation at the keeper-alloy interface was significantly less at lower burn-out temperatures (P<.001). Conclusions: A burn-out temperature of 500°C for casting the Magfit EX keeper with type IV high-strength gold alloy is recommended. (J Prosthet Dent 2009;101:66-72). © 2009 The Editorial Council of the Journal of Prosthetic Dentistry.
Persistent Identifierhttp://hdl.handle.net/10722/58083
ISSN
2014 Impact Factor: 1.753
2015 SCImago Journal Rankings: 0.507
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPow, EHNen_HK
dc.contributor.authorChan, KHCen_HK
dc.contributor.authorLuk, HWKen_HK
dc.contributor.authorDias, APLHen_HK
dc.contributor.authorMcMillan, ASen_HK
dc.date.accessioned2010-05-31T03:23:31Z-
dc.date.available2010-05-31T03:23:31Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of Prosthetic Dentistry, 2009, v. 101 n. 1, p. 66-72en_HK
dc.identifier.issn0022-3913en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58083-
dc.description.abstractStatement of problem: Early loss of magnetic keepers in cast gold posts is seen in clinical practice. Purpose: The purpose of this vitro study was to investigate the effect of burn-out temperature on the retention of magnetic keepers in cast gold alloy and on the thickness of the oxide layer at the keeper-alloy interface. Material and methods: One hundred and five keepers (Magfit EX) were cast with gold alloy (Protor 3) at 3 different burn-out temperatures: 500°C, 600°C, or 700°C (n=35). To test for retention of keepers, 60 specimens (n=20) were tested to failure in tension mode in a universal testing machine (UTM); 45 specimens (n=15) were sectioned, and the interface was evaluated under a scanning electron microscope (SEM). Tensile force data were analyzed with 1-way ANOVA, and SEM data were analyzed with 1-way repeated measures ANOVA. Bonferroni multiple comparisons were performed for post hoc analysis (α=.05). Results: Retention of the keepers was significantly higher at lower burn-out temperatures (P<.001). The retention of the keepers became unpredictable and immediate failures were observed at a burn-out temperature of 700°C. Oxide formation at the keeper-alloy interface was significantly less at lower burn-out temperatures (P<.001). Conclusions: A burn-out temperature of 500°C for casting the Magfit EX keeper with type IV high-strength gold alloy is recommended. (J Prosthet Dent 2009;101:66-72). © 2009 The Editorial Council of the Journal of Prosthetic Dentistry.en_HK
dc.languageengen_HK
dc.publisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/prosdenten_HK
dc.relation.ispartofJournal of Prosthetic Dentistryen_HK
dc.rightsJournal of Prosthetic Dentistry. Copyright © Mosby, Inc.en_HK
dc.subject.meshCalcium Sulfateen_HK
dc.subject.meshDental Alloysen_HK
dc.subject.meshDental Casting Investmenten_HK
dc.subject.meshDental Casting Techniqueen_HK
dc.subject.meshDental Restoration Failureen_HK
dc.subject.meshDental Stress Analysisen_HK
dc.subject.meshDenture Retention - instrumentationen_HK
dc.subject.meshDenture, Overlayen_HK
dc.subject.meshGold Alloys - chemistryen_HK
dc.subject.meshHot Temperatureen_HK
dc.subject.meshMagnetics - instrumentationen_HK
dc.subject.meshOxidesen_HK
dc.subject.meshPost and Core Techniqueen_HK
dc.subject.meshStainless Steelen_HK
dc.subject.meshTensile Strengthen_HK
dc.titleEffect of burn-out temperature on magnetic keepers in cast noble metal alloy postsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-3913&volume=101&spage=66&epage=72&date=2009&atitle=Effect+of+burn-out+temperature+on+magnetic+keepers+in+cast+noble+metal+alloy+posts.en_HK
dc.identifier.emailPow, EHN: ehnpow@hku.hken_HK
dc.identifier.emailLuk, HWK: wkluka@hkucc.hku.hken_HK
dc.identifier.emailMcMillan, AS: annemcmillan@hku.hken_HK
dc.identifier.authorityPow, EHN=rp00030en_HK
dc.identifier.authorityLuk, HWK=rp00008en_HK
dc.identifier.authorityMcMillan, AS=rp00014en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0022-3913(08)60293-0en_HK
dc.identifier.pmid19105993-
dc.identifier.scopuseid_2-s2.0-57749178404en_HK
dc.identifier.hkuros156832en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57749178404&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume101en_HK
dc.identifier.issue1en_HK
dc.identifier.spage66en_HK
dc.identifier.epage72en_HK
dc.identifier.isiWOS:000262620100009-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridPow, EHN=6603825799en_HK
dc.identifier.scopusauthoridChan, KHC=26423538300en_HK
dc.identifier.scopusauthoridLuk, HWK=7006636056en_HK
dc.identifier.scopusauthoridDias, APLH=23495523300en_HK
dc.identifier.scopusauthoridMcMillan, AS=7102843317en_HK

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