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Conference Paper: Effect of heat treatment during curing of provisional restorative materials

TitleEffect of heat treatment during curing of provisional restorative materials
Authors
KeywordsAcrylics
Composites
Dental materials
Polymerization and Polymers
Issue Date2012
PublisherSage Publications, Inc. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925
Citation
The Annual Meeting of the International Association for Dental Research (IADR) Southeast Asian Division, Hong Kong, China, 3-4 November 2012. In Journal of Dental Research, 2012, v. 91 n. Special Issue C: abstract no. 168934 How to Cite?
AbstractObjectives: To investigate in vitro the influence of heat treatment during setting on the flexural strength of four resin-based acrylic provisional restorative dental biomaterials. Methods: Four provisional restoration biomaterials, namely poly(methyl methacrylate)(DuraLay, Illinois, USA), poly(ethyl methacrylate) (Trim II, Illinois, USA), bis-acrylic composites (Luxatemp Star, Hamburg, Germany and Protemp 4, Seefeld, Germany) were selected for this laboratory investigation. Rectangular specimen beams with the dimensions of 25 mm x 2 mm x 2 mm were prepared using a stainless steel mould according to the manufacturers' instructions. Next, the specimens were chemically cured either in room temperature (23°C) or in a water bath at 100°C for 1 min. Ten specimens per experimental group were subjected to thermo-cycling (3000 cycles, between 5-55°C,with an immersion time of 20 s). Flexural strength of each specimen was determined by 3-point bending test at crosshead speed of 1 mm/min. Data was analyzed using 2-sample t-test and 2-way ANOVA. Results: The mean flexural strength (±SD) of DuraLay, Trim II, Luxatemp Star and Protemp 4 were 73.31±7.89MPa, 41.79±5.09MPa, 106.20±27.16MPa and 87.50±9.76MPa, respectively (p=0.003). Heat treatment reduced substantially the mean flexural strength of DuraLay (55.65MPa vs.73.31MPa; p<0.001) and Trim II (3.62MPa vs. 41.79MPa; p<0.001) by 24% and 91%, respectively. Heat treatment had no significant effects on Luxatemp Star (106.20MPa vs. 96.14MPa; p<0.383), but it increased the mean flexural strength of Protemp 4 (107.87MPa vs. 87.05MPa; p<0.001) by 23%. Conclusions: In this laboratory study, the two bis-acryl resin composites exhibited superior flexural strength than poly(methyl methacrylate) and poly(ethyl methacrylate) resins. Heat treatment using a water bath at 100°C for 1 min adversely affected the flexural strength of poly(methyl methacrylate) and poly(ethyl methacrylate) resins, but it enhanced flexural strength of a bis-acrylic composite.
DescriptionSession: Dental Materials
Persistent Identifierhttp://hdl.handle.net/10722/192520
ISSN
2015 Impact Factor: 4.602
2015 SCImago Journal Rankings: 1.714

 

DC FieldValueLanguage
dc.contributor.authorSo, SYCen_US
dc.contributor.authorChu, CHen_US
dc.contributor.authorMatinlinna, JPen_US
dc.date.accessioned2013-11-15T02:20:47Z-
dc.date.available2013-11-15T02:20:47Z-
dc.date.issued2012en_US
dc.identifier.citationThe Annual Meeting of the International Association for Dental Research (IADR) Southeast Asian Division, Hong Kong, China, 3-4 November 2012. In Journal of Dental Research, 2012, v. 91 n. Special Issue C: abstract no. 168934en_US
dc.identifier.issn0022-0345-
dc.identifier.urihttp://hdl.handle.net/10722/192520-
dc.descriptionSession: Dental Materials-
dc.description.abstractObjectives: To investigate in vitro the influence of heat treatment during setting on the flexural strength of four resin-based acrylic provisional restorative dental biomaterials. Methods: Four provisional restoration biomaterials, namely poly(methyl methacrylate)(DuraLay, Illinois, USA), poly(ethyl methacrylate) (Trim II, Illinois, USA), bis-acrylic composites (Luxatemp Star, Hamburg, Germany and Protemp 4, Seefeld, Germany) were selected for this laboratory investigation. Rectangular specimen beams with the dimensions of 25 mm x 2 mm x 2 mm were prepared using a stainless steel mould according to the manufacturers' instructions. Next, the specimens were chemically cured either in room temperature (23°C) or in a water bath at 100°C for 1 min. Ten specimens per experimental group were subjected to thermo-cycling (3000 cycles, between 5-55°C,with an immersion time of 20 s). Flexural strength of each specimen was determined by 3-point bending test at crosshead speed of 1 mm/min. Data was analyzed using 2-sample t-test and 2-way ANOVA. Results: The mean flexural strength (±SD) of DuraLay, Trim II, Luxatemp Star and Protemp 4 were 73.31±7.89MPa, 41.79±5.09MPa, 106.20±27.16MPa and 87.50±9.76MPa, respectively (p=0.003). Heat treatment reduced substantially the mean flexural strength of DuraLay (55.65MPa vs.73.31MPa; p<0.001) and Trim II (3.62MPa vs. 41.79MPa; p<0.001) by 24% and 91%, respectively. Heat treatment had no significant effects on Luxatemp Star (106.20MPa vs. 96.14MPa; p<0.383), but it increased the mean flexural strength of Protemp 4 (107.87MPa vs. 87.05MPa; p<0.001) by 23%. Conclusions: In this laboratory study, the two bis-acryl resin composites exhibited superior flexural strength than poly(methyl methacrylate) and poly(ethyl methacrylate) resins. Heat treatment using a water bath at 100°C for 1 min adversely affected the flexural strength of poly(methyl methacrylate) and poly(ethyl methacrylate) resins, but it enhanced flexural strength of a bis-acrylic composite.-
dc.languageengen_US
dc.publisherSage Publications, Inc. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925-
dc.relation.ispartofJournal of Dental Researchen_US
dc.rightsJournal of Dental Research. Copyright © Sage Publications, Inc.-
dc.subjectAcrylics-
dc.subjectComposites-
dc.subjectDental materials-
dc.subjectPolymerization and Polymers-
dc.titleEffect of heat treatment during curing of provisional restorative materialsen_US
dc.typeConference_Paperen_US
dc.identifier.emailChu, CH: chchu@hku.hken_US
dc.identifier.emailMatinlinna, JP: jpmat@hku.hken_US
dc.identifier.authorityChu, CH=rp00022en_US
dc.identifier.authorityMatinlinna, JP=rp00052en_US
dc.identifier.hkuros226775en_US
dc.identifier.volume91en_US
dc.identifier.issueSpecial Issue C: abstract no. 168934-
dc.publisher.placeUnited States-

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