Article: Pressure and temperature changes of heat-cured acrylic resin during processing

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TitlePressure and temperature changes of heat-cured acrylic resin during processing
AuthorsYau, EWF
Cheng, YY1
Clark, RKF2
Chow, TW1
Issue Date2002
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
CitationDental Materials, 2002, v. 18 n. 8, p. 622-629 [How to Cite?]
DOI: http://dx.doi.org/10.1016/S0109-5641(01)00092-6
AbstractOBJECTIVES: The aims of this study were to measure the pressure and temperature changes of acrylic resin during processing, to record the highest temperature reached when fast cured in boiling water and to determine the elevated boiling point of monomer under high pressure. METHODS: A subminiature pressure transducer (temperature compensated to 94 degrees C) and a thermocouple were placed on the palate of a standardized maxillary complete denture base. A heat-cured resin (Trevalon C) was polymerized by a long heating cycle (72 degrees C for 6.5 h and 92 degrees C for 1.5 h). Recordings of pressure and temperature (n=6) were made at initial clamping of denture flasks and throughout the processing cycles of resin. The temperature of the resin was also monitored during a fast cycle, which was accomplished by placing the flask directly into boiling water for 40 min. RESULTS: The pressure of acrylic dough inside the clamped flask was initially 11.5 atm (SD=3.2) and reached a peak of 22.0 atm (SD=3.5) during the long heating cycle. The elevated boiling point of monomer at increased pressure was calculated to be about 193 degrees C (at 11.5 atm) and 228 degrees C (at 22.0 atm). These elevated boiling points are higher than the maximum temperature 131 degrees C (SD=6.6) reached during the fast curing cycle. No porosity was observed even in the denture bases heat-cured by the fast cycle. SIGNIFICANCE: The highest temperature reached by heating of resin during processing is well below the elevated boiling point of monomer. Monomer therefore does not boil in clamped denture flasks under sufficient pressure. Thus adequate clamp pressure prevents gaseous porosity irrespective of curing cycle used.
ISSN0109-5641
2011 Impact Factor: 3.135
2011 SCImago Journal Rankings: 0.159
DOIhttp://dx.doi.org/10.1016/S0109-5641(01)00092-6
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorYau, EWF
dc.contributor.authorCheng, YY
dc.contributor.authorClark, RKF
dc.contributor.authorChow, TW
dc.date.accessioned2012-08-08T08:23:55Z
dc.date.available2012-08-08T08:23:55Z
dc.date.issued2002
dc.description.abstractOBJECTIVES: The aims of this study were to measure the pressure and temperature changes of acrylic resin during processing, to record the highest temperature reached when fast cured in boiling water and to determine the elevated boiling point of monomer under high pressure. METHODS: A subminiature pressure transducer (temperature compensated to 94 degrees C) and a thermocouple were placed on the palate of a standardized maxillary complete denture base. A heat-cured resin (Trevalon C) was polymerized by a long heating cycle (72 degrees C for 6.5 h and 92 degrees C for 1.5 h). Recordings of pressure and temperature (n=6) were made at initial clamping of denture flasks and throughout the processing cycles of resin. The temperature of the resin was also monitored during a fast cycle, which was accomplished by placing the flask directly into boiling water for 40 min. RESULTS: The pressure of acrylic dough inside the clamped flask was initially 11.5 atm (SD=3.2) and reached a peak of 22.0 atm (SD=3.5) during the long heating cycle. The elevated boiling point of monomer at increased pressure was calculated to be about 193 degrees C (at 11.5 atm) and 228 degrees C (at 22.0 atm). These elevated boiling points are higher than the maximum temperature 131 degrees C (SD=6.6) reached during the fast curing cycle. No porosity was observed even in the denture bases heat-cured by the fast cycle. SIGNIFICANCE: The highest temperature reached by heating of resin during processing is well below the elevated boiling point of monomer. Monomer therefore does not boil in clamped denture flasks under sufficient pressure. Thus adequate clamp pressure prevents gaseous porosity irrespective of curing cycle used.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationDental Materials, 2002, v. 18 n. 8, p. 622-629 [How to Cite?]
DOI: http://dx.doi.org/10.1016/S0109-5641(01)00092-6
dc.identifier.doihttp://dx.doi.org/10.1016/S0109-5641(01)00092-6
dc.identifier.epage629
dc.identifier.hkuros81787
dc.identifier.isiWOS:000179320900009
dc.identifier.issn0109-5641
2011 Impact Factor: 3.135
2011 SCImago Journal Rankings: 0.159
dc.identifier.issue8
dc.identifier.pmid12385904
dc.identifier.scopuseid_2-s2.0-0036885644
dc.identifier.spage622
dc.identifier.urihttp://hdl.handle.net/10722/154215
dc.identifier.volume18
dc.languageeng
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
dc.publisher.placeUnited States
dc.relation.ispartofDental Materials
dc.relation.referencesReferences in Scopus
dc.subject.meshTemperature
dc.subject.meshPressure
dc.subject.meshPorosity
dc.subject.meshPolymers - Chemistry
dc.subject.meshPhysicochemical Phenomena
dc.subject.meshMethylmethacrylates - Chemistry
dc.subject.meshAcrylic Resins - chemistry
dc.subject.meshChemistry, Physical
dc.subject.meshDenture Bases
dc.subject.meshDifferential Thermal Analysis
dc.subject.meshMaterials Testing
dc.titlePressure and temperature changes of heat-cured acrylic resin during processing
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong
  2. Guy's Hospital