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In‐vitro pulpal temperature increases when photo‐curing bulk‐fill resin‐based composites using laser or light‐emitting diode light curing units

Objective To evaluate the in vitro pulpal temperature rise (ΔT) within the pulp chamber when low‐ and high‐viscosity bulk‐fill resin composites are photo‐cured using laser or contemporary light curing units (LCUs). Materials and Methods The light output from five LCUs was measured. Non‐retentive Cla...

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Bibliographic Details
Published in:Journal of esthetic and restorative dentistry 2023-06, Vol.35 (4), p.705-716
Main Authors: Maucoski, Cristiane, Price, Richard Bengt, Sullivan, Braden, Guarneri, Juliana Anany Gonzales, Gusso, Bruno, Arrais, Cesar Augusto Galvão
Format: Article
Language:English
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Summary:Objective To evaluate the in vitro pulpal temperature rise (ΔT) within the pulp chamber when low‐ and high‐viscosity bulk‐fill resin composites are photo‐cured using laser or contemporary light curing units (LCUs). Materials and Methods The light output from five LCUs was measured. Non‐retentive Class I and V cavities were prepared in one upper molar. Two T‐type thermocouples were inserted into the pulp chamber. After the PT values reached 32°C under simulated pulp flow (0.026 mL/min), both cavities were restored with: Filtek One Bulk Fill (3 M), Filtek Bulk Fill Flow (3 M), Tetric PowerFill (Ivoclar Vivadent), or Tetric PowerFlow (Ivoclar Vivadent). The tooth was exposed as follows: Monet Laser (1 and 3 s), PowerCure (3 and 20 s), PinkWave (3 and 20 s), Valo X (5 and 20 s) and SmartLite Pro (20 s). The ΔT data were subjected to one‐way ANOVA followed by Scheffe's post hoc test. Results Monet 1 s (1.9 J) and PinkWave 20 s (30.1 J) delivered the least and the highest amount of energy, respectively. Valo X and PinkWave used for 20 s produced the highest ΔT values (3.4–4.1°C). Monet 1 s, PinkWave 3 s, PowerCure 3 s (except FB‐Flow) and Monet 3 s for FB‐One and TP‐Fill produced the lowest ΔT values (0.9–1.7°C). No significant differences were found among composites. Conclusions Short 1‐ to 3‐s exposures produced acceptable temperature rises, regardless of the composite. Clinical Significance The energy delivered to the tooth by the LCUs affects the temperature rise inside the pulp. The short 1–3 s exposure times used in this study delivered the least amount of energy and produced a lower temperature rise. However, the RBC may not have received sufficient energy to be adequately photo‐cured.
ISSN:1496-4155
1708-8240
DOI:10.1111/jerd.13022