DOI: 10.5176/2345-7201_1.1.10
Authors: Kosmas Tolids, Tiverios Vaimakis, Christina Boutsiouki, Paris Gerasimou
Abstract:
Purpose of the study was to evaluate the effect of type of composite resin (CR) and the intensity of curing device on thermal behavior. A microhybrid composite (C), a giomer (G), an ormocer (O) and silorane (S) were chosen. Specimens were polymerized with a higher (H) and a lower (L) energy LED curing device. Coefficient of thermal expansion (CTE) measurements were performed with a dilatometer at temperature range 20-60oC with temperature raise 2oC/min. CTE values in lower temperatures (21oC-37oC) (CTEa) were compared to CTE values in higher temperatures (37oC-55oC) (CTEb). CTEa for all resin composites ranged from 5.43 – 38.67 (x 10-6/oC) and CTEb from 22.20 – 48.87 (x 10-6/oC), thus depending on CR type, curing intensity and temperature range. Type of CR and light intensity of curing device have an effect on thermal behavior. The higher the temperature, the higher the CTE for all materials. It is advisable to polymerize C with lower intensity curing unit and S and O with higher intensity. G exhibits the highest CTE values with both curing devices, while O exhibits intermediate results with both light intensities in all temperatures.
Manuscript received December 5, 2013.
K. Tolidis is an Associate Professor at the Department of Operative Dentistry in Aristotle University of Thessaloniki, 54124, Greece (e-mail: ktolidis@dent.auth.gr).
T. Vaimakis is an Associate Professor at Section of Industrial and Food Chemistry, Department of Chemistry, School of Sciences, University of Ioannina, 45110, Greece (e-mail: tvaimak@cc.uoi.gr).
C. Boutsiouki is a Dental Surgeon and Post-graduate Student at the Department of Operative Dentistry in Aristotle University of Thessaloniki, 54124, Greece (corresponding author: phone: +30 2313042147, fax: +30 2313042147, e-mail: christinaboutsiouki@gmail.com).
P. Gerasimou is an Assistant Professor at the Department of Operative Dentistry in Aristotle University of Thessaloniki, 54124, Greece (e-mail: parisge@otenet.gr).
Higher intensity LED resulted in inhomogenous thermal behavior of the tested materials, especially of S.
Keywords: Coefficient of Thermal Expansion, Composite Resin, Silorane, Ormocer, Giomer
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