Back to Journals » Clinical, Cosmetic and Investigational Dentistry » Volume 12

Heat Development in the Pulp Chamber During Curing Process of Resin-Based Composite Using Multi-Wave LED Light Curing Unit

Authors Nilsen BW, Mouhat M, Haukland T, Örtengren UT, Mercer JB

Received 8 April 2020

Accepted for publication 29 May 2020

Published 8 July 2020 Volume 2020:12 Pages 271—280


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Professor Christopher E. Okunseri

Bo Wold Nilsen,1,* Mathieu Mouhat,1,* Torbjørn Haukland,1 Ulf Thore Örtengren,1,2 James B Mercer3

1Department of Clinical Dentistry, UiT - the Arctic University of Norway, Tromsø, Norway; 2Department of Cariology, Institute of Odontology/Sahlgrenska Academy, Gothenburg, Sweden; 3Department of Medical Biology, UiT - the Arctic University of Norway, Tromsø, Norway

*These authors contributed equally to this work

Correspondence: Mathieu Mouhat Email

Objective: The study aimed to investigate factors contributing to heat development during light curing of a flowable bulk-fill resin-based composite (SDRTM, Lot # 602000876, Dentsply Sirona, Konstanz, Germany) (RBC).
Materials and Methods: Temperatures were measured with calibrated thermocouples. A multi-wave light-emitting diode (LED) light curing unit (LCU) was used (Ivoclar Vivadent, Schaan, Lichtenstein). In all experiments, the RBC was first cured (cured) for 30 s and, after 5 min of recovery time, received a second LCU irradiation (post-cured) for 30 s. The exothermic reaction was measured by calculating the Δ temperature between cured and post-cured RBC. In a cylinder-shaped polymer mold, temperature was recorded inside of RBC during curing (part 1) and light transmission through RBC during curing was investigated (part 2). Pulpal temperatures were assessed in an extracted third molar during light curing (part 3). Data were statistically analyzed using one-way ANOVA (α=0.05).
Results: Increased thickness of RBC led to decreased pulp chamber temperatures. Inside RBC, there was a large variation in heat development between the cured and post-cured groups (p< 0.05). The cured group absorbed more LCU irradiation than the post-cured group.
Conclusion: The irradiance of the LCU seemed to be a more important factor than exothermic reaction of RBCs for pulp chamber heat development. Flowable bulk-fill RBCs can act as a pulpal insulator against LCU irradiation, despite their exothermic curing reaction.

Keywords: dentistry, composite resins, LED dental curing light, pulp chamber, temperature

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF]  View Full Text [HTML][Machine readable]