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Dynamic mechanical thermal analysis of two light-cured dental composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
Department of Dental Biomaterials, University of Florida.
2005 (English)In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 21, no 10, p. 977-983Article in journal (Refereed) Published
Abstract [en]

ObjectivesClinical observations suggest that some composite resins are more often linked to post-operative sensitivity than others. These differences may relate to differences in modulus of elasticity and polymerization rates among materials. The aim of this study was to identify viscoelastic behavior of two light curable composites and determine whether significant differences in viscoelastic behavior exist between the two materials when light cured at each of three different irradiance values.MethodsTwo composites (Z100 and Z250 by 3M ESPE) were evaluated. Six specimens per composite and irradiance value (250, 500 and 850 mW/cm2) were made. The curing times were chosen to produce a fixed energy value of 30 J/cm2 independent of irradiation value. Dynamic mechanical thermal analysis (DMTA) was performed in single cantilever clamped mode.ResultsThere were significant differences in transition temperatures between the two materials and the three frequencies at their glass transition temperatures, while significant differences did not exist at the lower transitions. The glass transition of Z250 was lower and narrower than that of Z100. Z250 exhibited lower storage modulus values. The irradiance values did not affect any of the transition temperatures significantly.SignificanceThe lower and more distinct Tg of Z250 suggests that Z250 cures more efficiently than Z100. The lower storage modulus of Z250 suggests that Z250 develops less stress in the tooth than Z100 during curing if shrinkage is the same for the two materials. The findings suggest that the material chosen, rather than irradiance, determines the stress level developed during light curing.

Place, publisher, year, edition, pages
2005. Vol. 21, no 10, p. 977-983
National Category
Composite Science and Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Polymeric Composite Materials; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-12197DOI: 10.1016/j.dental.2005.02.016ISI: 000232428700010Scopus ID: 2-s2.0-25144508255Local ID: b4afdfa0-e80f-11db-b9a9-000ea68e967bOAI: oai:DiVA.org:ltu-12197DiVA, id: diva2:985147
Note
Validerad; 2005; 20070411 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Emami, Nazanin

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