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Conference Paper: Effect of heat treatment during curing of provisional restorative materials
Title | Effect of heat treatment during curing of provisional restorative materials |
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Authors | |
Keywords | Acrylics Composites Dental materials Polymerization and Polymers |
Issue Date | 2012 |
Publisher | Sage 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? |
Abstract | Objectives: 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. |
Description | Session: Dental Materials |
Persistent Identifier | http://hdl.handle.net/10722/192520 |
ISSN | 2023 Impact Factor: 5.7 2023 SCImago Journal Rankings: 1.909 |
DC Field | Value | Language |
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dc.contributor.author | So, SYC | en_US |
dc.contributor.author | Chu, CH | en_US |
dc.contributor.author | Matinlinna, JP | en_US |
dc.date.accessioned | 2013-11-15T02:20:47Z | - |
dc.date.available | 2013-11-15T02:20:47Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.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 | en_US |
dc.identifier.issn | 0022-0345 | - |
dc.identifier.uri | http://hdl.handle.net/10722/192520 | - |
dc.description | Session: Dental Materials | - |
dc.description.abstract | Objectives: 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.language | eng | en_US |
dc.publisher | Sage Publications, Inc. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925 | - |
dc.relation.ispartof | Journal of Dental Research | en_US |
dc.rights | Journal of Dental Research. Copyright © Sage Publications, Inc. | - |
dc.subject | Acrylics | - |
dc.subject | Composites | - |
dc.subject | Dental materials | - |
dc.subject | Polymerization and Polymers | - |
dc.title | Effect of heat treatment during curing of provisional restorative materials | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Chu, CH: chchu@hku.hk | en_US |
dc.identifier.email | Matinlinna, JP: jpmat@hku.hk | en_US |
dc.identifier.authority | Chu, CH=rp00022 | en_US |
dc.identifier.authority | Matinlinna, JP=rp00052 | en_US |
dc.identifier.hkuros | 226775 | en_US |
dc.identifier.volume | 91 | en_US |
dc.identifier.issue | Special Issue C: abstract no. 168934 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0022-0345 | - |