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Conference Paper: Heat treatment during setting on properties of resin-based provisional-restorative materials

TitleHeat treatment during setting on properties of resin-based provisional-restorative materials
Authors
KeywordsResin
Provisional
Restorative
Issue Date2014
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
The 2014 Annual Meeting of the Academy of Dental Materials, Bologna, Italy, 8-11 October 2014. In Dental Materials, 2014, v. 30 suppl. 1, p. e57 How to Cite?
AbstractPURPOSE: To study the effect of heat treatment during setting on the physical properties of four resin-based provisional restorative materials. METHODS AND MATERIALS: Four commercial restorative resin materials were employed, namely Duralay (polymethyl methacrylate), Trim II (polyethyl methacrylate), Luxatemp (bis-acrylic composite) and Protemp 4 (bis-acrylic composite). Specimens were prepared at 23 °C, 37 °C or 60 °C in a water bath for evaluation of flexural strength, surface profile, color stability and marginal discrepancy. Flexural strength was determined by 3-point-bending test on each specimen after thermo-cycling (3000 cycles, between 5-55 °C), and its fractured surface was examined under scanning electron microscopy. Surface profile of the specimens was studied using atomic force microscopy. Color stability (ΔE*) was evaluated by comparing the color of the specimens before and after placed in coffee for 14 days. Standardized crowns were prepared for assessment of marginal discrepancy using a travelling microscope. RESULTS: Flexural strength of Trim II and Protemp 4 at 60 °C (Trim II: 51.52 ± 5.59 MPa, Protemp 4: 115.41 ± 12.76 MPa) were higher than those at 37 °C (Trim II: 43.61 ± 6.21 MPa, Protemp 4: 89.38 ± 8.59 MPa) and 23 °C (Trim II: 41.79 ± 5.37 MPa, Protemp 4: 87.50 ± 10.29 MPa) (p < 0.05). Flexural strength of Duralay and Luxatemp were not significantly different at different curing temperature (p > 0.05). Slight difference of surface morphology could be seen between different curing temperatures of all types of materials. Luxatemp and Protemp 4 have lower ΔE* compared with other materials, in all the three curing temperatures. Marginal discrepancy of Trim II, Luxatemp and Protemp 4 were higher at 60 °C than those at 23 °C and 37 °C. CONCLUSION: Increase in curing temperature enhances flexural strength of certain resin-based acrylic provisional veneers; however, there is also an increase in the marginal discrepancy. Different curing temperature slightly altered the surface morphology and color stability of material, while different materials have obvious different properties in terms of surface morphology and color stability.
DescriptionThis journal suppl. entitled: Abstracts of the Academy of Dental Materials Annual Meeting, 8-11 October 2014 - Bologna, Italy
Persistent Identifierhttp://hdl.handle.net/10722/219250
ISSN
2015 Impact Factor: 3.931
2015 SCImago Journal Rankings: 1.339

 

DC FieldValueLanguage
dc.contributor.authorChu, CH-
dc.contributor.authorMei, L-
dc.date.accessioned2015-09-18T07:18:56Z-
dc.date.available2015-09-18T07:18:56Z-
dc.date.issued2014-
dc.identifier.citationThe 2014 Annual Meeting of the Academy of Dental Materials, Bologna, Italy, 8-11 October 2014. In Dental Materials, 2014, v. 30 suppl. 1, p. e57-
dc.identifier.issn0109-5641-
dc.identifier.urihttp://hdl.handle.net/10722/219250-
dc.descriptionThis journal suppl. entitled: Abstracts of the Academy of Dental Materials Annual Meeting, 8-11 October 2014 - Bologna, Italy-
dc.description.abstractPURPOSE: To study the effect of heat treatment during setting on the physical properties of four resin-based provisional restorative materials. METHODS AND MATERIALS: Four commercial restorative resin materials were employed, namely Duralay (polymethyl methacrylate), Trim II (polyethyl methacrylate), Luxatemp (bis-acrylic composite) and Protemp 4 (bis-acrylic composite). Specimens were prepared at 23 °C, 37 °C or 60 °C in a water bath for evaluation of flexural strength, surface profile, color stability and marginal discrepancy. Flexural strength was determined by 3-point-bending test on each specimen after thermo-cycling (3000 cycles, between 5-55 °C), and its fractured surface was examined under scanning electron microscopy. Surface profile of the specimens was studied using atomic force microscopy. Color stability (ΔE*) was evaluated by comparing the color of the specimens before and after placed in coffee for 14 days. Standardized crowns were prepared for assessment of marginal discrepancy using a travelling microscope. RESULTS: Flexural strength of Trim II and Protemp 4 at 60 °C (Trim II: 51.52 ± 5.59 MPa, Protemp 4: 115.41 ± 12.76 MPa) were higher than those at 37 °C (Trim II: 43.61 ± 6.21 MPa, Protemp 4: 89.38 ± 8.59 MPa) and 23 °C (Trim II: 41.79 ± 5.37 MPa, Protemp 4: 87.50 ± 10.29 MPa) (p < 0.05). Flexural strength of Duralay and Luxatemp were not significantly different at different curing temperature (p > 0.05). Slight difference of surface morphology could be seen between different curing temperatures of all types of materials. Luxatemp and Protemp 4 have lower ΔE* compared with other materials, in all the three curing temperatures. Marginal discrepancy of Trim II, Luxatemp and Protemp 4 were higher at 60 °C than those at 23 °C and 37 °C. CONCLUSION: Increase in curing temperature enhances flexural strength of certain resin-based acrylic provisional veneers; however, there is also an increase in the marginal discrepancy. Different curing temperature slightly altered the surface morphology and color stability of material, while different materials have obvious different properties in terms of surface morphology and color stability.-
dc.languageeng-
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental-
dc.relation.ispartofDental Materials-
dc.rights© 2014. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectResin-
dc.subjectProvisional-
dc.subjectRestorative-
dc.titleHeat treatment during setting on properties of resin-based provisional-restorative materials-
dc.typeConference_Paper-
dc.identifier.emailChu, CH: chchu@hku.hk-
dc.identifier.emailMei, L: mei1123@hku.hk-
dc.identifier.authorityChu, CH=rp00022-
dc.identifier.authorityMei, L=rp01840-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.dental.2014.08.114-
dc.identifier.hkuros251057-
dc.identifier.volume30-
dc.identifier.issuesuppl. 1-
dc.identifier.spagee57-
dc.identifier.epagee57-
dc.publisher.placeUnited States-

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