TODENTJ-25-03-2019_TODENTJ-10-538 1553506657 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 09 30 2016 10 1 Ayob Pahlevan Masumeh Hasani Tabatabaei Sakineh Arami Sara Valizadeh Objectives: Different light curing units are used for polymerization of composite resins. The aim of this study was to evaluate the degree of conversion (DC) and temperature rise in hybrid and low shrinkage composite resins cured by LED and Argon Laser curing lights. Materials and Methods: DC was measured using FTIR spectroscopy. For measuring temperature rise, composite resin samples were placed in Teflon molds and cured from the top. The thermocouple under samples recorded the temperature rise. After initial radiation and specimens reaching the ambient temperature, reirradiation was done and temperature was recorded again. Both temperature rise and DC data submitted to one-way ANOVA and Tukey-HSD tests (5% significance). Results: The obtained results revealed that DC was not significantly different between the understudy composite resins or curing units. Low shrinkage composite resin showed a significantly higher temperature rise than hybrid composite resin. Argon laser caused the lowest temperature rise among the curing units. Conclusion: Energy density of light curing units was correlated with the DC. Type of composite resin and light curing unit had a significant effect on temperature rise due to polymerization and curing unit, respectively. 09 30 2016 538 545 TODENTJ-10-538 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2016-02-18 2016-07-11 2016-08-7 2016-09-30 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601610010538 1553506657 https://opendentistryjournal.com/VOLUME/10/PAGE/538/ https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-538/TODENTJ-10-538.xml J. 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