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BioMed Research International
Volume 2016 (2016), Article ID 1894672, 10 pages
http://dx.doi.org/10.1155/2016/1894672
Research Article

LED Curing Lights and Temperature Changes in Different Tooth Sites

1Department of Clinical Science and Translational Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
2Faculty of Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy

Received 22 December 2015; Revised 8 March 2016; Accepted 28 March 2016

Academic Editor: Nick Silikas

Copyright © 2016 E. Armellin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives. The aim of this in vitro study was to assess thermal changes on tooth tissues during light exposure using two different LED curing units. The hypothesis was that no temperature increase could be detected within the dental pulp during polymerization irrespective of the use of a composite resin or a light-curing unit. Methods. Caries-free human first molars were selected, pulp residues were removed after root resection, and four calibrated type-J thermocouples were positioned. Two LED lamps were tested; temperature measurements were made on intact teeth and on the same tooth during curing of composite restorations. The data was analyzed by one-way analysis of variance (ANOVA), Wilcoxon test, Kruskal-Wallis test, and Pearson’s . After ANOVA, the Bonferroni multiple comparison test was performed. Results. Polymerization data analysis showed that in the pulp chamber temperature increase was higher than that without resin. Starlight PRO, in the same condition of Valo lamp, showed a lower temperature increase in pre- and intrapolymerization. A control group (without composite resin) was evaluated. Significance. Temperature increase during resin curing is a function of the rate of polymerization, due to the exothermic polymerization reaction, the energy from the light unit, and time of exposure.