Article: Events in the mould during heat processing of poly(methyl methacrylate).

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TitleEvents in the mould during heat processing of poly(methyl methacrylate).
AuthorsClark, RKF
Cheng, YY
Chow, TW
Issue Date2003
PublisherFDI World Dental Press Ltd. The Journal's web site is located at http://www.fdiworldental.org/resources/4_4prosthodontics.html
CitationEuropean Journal Of Prosthodontics And Restorative Dentistry, 2003, v. 11 n. 1, p. 29-31 [How to Cite?]
AbstractRecordings of temperature and pressure in the mould have raised questions concerning the flow of poly(methylmethacrylate) during heat processing. Three simple experiments investigated flow of polymerised and partly polymerised poly(methylmethacrylate). Flow was not observed at normal processing temperatures. These results, combined with the results of previous work, suggest that as the mould heats up, thermal expansion of the dough exceeds polymerisation contraction, causing increase in pressure rather than flow. Maximum pressure occurs at maximum temperature. Thereafter, thermal expansion is reduced, polymerisation contraction increases and pressure in the mould drops. When the lowest pressure is reached the poly(methylmethacrylate) is polymerised.
ISSN0965-7452
2011 SCImago Journal Rankings: 0.035
DC Field
Value
dc.contributor.authorClark, RKF
dc.contributor.authorCheng, YY
dc.contributor.authorChow, TW
dc.date.accessioned2012-08-08T08:24:07Z
dc.date.available2012-08-08T08:24:07Z
dc.date.issued2003
dc.description.abstractRecordings of temperature and pressure in the mould have raised questions concerning the flow of poly(methylmethacrylate) during heat processing. Three simple experiments investigated flow of polymerised and partly polymerised poly(methylmethacrylate). Flow was not observed at normal processing temperatures. These results, combined with the results of previous work, suggest that as the mould heats up, thermal expansion of the dough exceeds polymerisation contraction, causing increase in pressure rather than flow. Maximum pressure occurs at maximum temperature. Thereafter, thermal expansion is reduced, polymerisation contraction increases and pressure in the mould drops. When the lowest pressure is reached the poly(methylmethacrylate) is polymerised.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationEuropean Journal Of Prosthodontics And Restorative Dentistry, 2003, v. 11 n. 1, p. 29-31 [How to Cite?]
dc.identifier.epage31
dc.identifier.hkuros81797
dc.identifier.issn0965-7452
2011 SCImago Journal Rankings: 0.035
dc.identifier.issue1
dc.identifier.openurl
dc.identifier.pmid12705036
dc.identifier.scopuseid_2-s2.0-0038072890
dc.identifier.spage29
dc.identifier.urihttp://hdl.handle.net/10722/154237
dc.identifier.volume11
dc.languageeng
dc.publisherFDI World Dental Press Ltd. The Journal's web site is located at http://www.fdiworldental.org/resources/4_4prosthodontics.html
dc.publisher.placeUnited Kingdom
dc.relation.ispartofThe European journal of prosthodontics and restorative dentistry
dc.subject.meshDental Models
dc.subject.meshDenture Bases
dc.subject.meshDifferential Thermal Analysis
dc.subject.meshHot Temperature
dc.subject.meshHumans
dc.subject.meshPolymethyl Methacrylate - Chemistry
dc.subject.meshPressure
dc.subject.meshRheology
dc.subject.meshTechnology, Dental
dc.subject.meshViscosity
dc.titleEvents in the mould during heat processing of poly(methyl methacrylate).
dc.typeArticle