The effect of resin composite pre-heating on monomer conversion and polymerization shrinkage
Lohbauer U, Zinelis S, Rahiotis C, Petschelt A, Eliades G (2009)
Publication Type: Journal article
Publication year: 2009
Journal
Book Volume: 25
Pages Range: 514-519
Journal Issue: 4
DOI: 10.1016/j.dental.2008.10.006
Abstract
Objectives: To determine monomer conversion and polymerization shrinkage of a resin composite after different pre-heating procedures and storage intervals. Methods: For a commercial resin-based composite the immediate (5 min) and final (24 h) degree of conversion was measured on top and bottom surfaces utilizing FTIR spectroscopy. Composite pre-heating temperatures were selected between 10 and 68 °C. Polymerization shrinkage was measured according to Archimedes' principles of buoyancy after 5 min at respective pre-heating temperatures and after 24 h dark and wet storage at 37 °C. Intra-cavity temperature development was monitored using a K-type thermocouple. Results: No significant increase in immediate as well as in final degree of conversion were measured from composite pre-heating at 68 °C compared to 54 and 39 °C. Linear correlations were detected immediately after photo-polymerization and on the top surface after 24 h storage. Polymerization shrinkage as a function of pre-heating temperatures exhibited a linear correlation after 5 min, but no statistically different behavior after 24 h. Significance: Pre-heating of resin composites does not increase degree of conversion over time. It can be clinically beneficial, due to a superior marginal adaptation. This advantageous effect of reduced material paste viscosity has to be clinically addressed, since temperature rapidly drops to the physiological level upon removal from the pre-heating device. © 2008 Academy of Dental Materials.
Authors with CRIS profile
Ulrich Lohbauer
Medizinische Fakultät
Anselm Petschelt
Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde
Involved external institutions
Greece (GR)How to cite
APA:
Lohbauer, U., Zinelis, S., Rahiotis, C., Petschelt, A., & Eliades, G. (2009). The effect of resin composite pre-heating on monomer conversion and polymerization shrinkage. Dental Materials, 25(4), 514-519. https://doi.org/10.1016/j.dental.2008.10.006
MLA:
Lohbauer, Ulrich, et al. "The effect of resin composite pre-heating on monomer conversion and polymerization shrinkage." Dental Materials 25.4 (2009): 514-519.
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