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Temperature changes and hardness of resin-based composites light-cured with laser diode or light-emitting diode curing lights

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Abstract

The temperature and Vickers Hardness (VH) at the top and bottom surfaces of three resin-based composites (RBCs) were measured when light-cured using five light-curing units (LCUs). The spectrum, power, and energy delivered to the top of the RBCs and transmitted through the RBCs were measured. Starting at 32℃, the temperature rise produced by the Monet Laser (ML—1 s and 3 s), Valo Grand (VG—3 s and 10 s), DeepCure (DC—10 s), PowerCure, (PC—3 s and 10 s) and PinkWave (PW—10 s) were measured at the bottom of specimens 2 mm deep × 6 mm wide made of Filtek Universal A2, Tetric Evoceram A2 and an experimental RBC codenamed Transcend UB. The VH values measured at the top and bottom of these RBCs were analyzed using ANOVA and Scheffe’s post hoc test (p < 0.05) to determine the effects of the LCUs on the RBCs. The transmitted power from the ML was reduced by 77.4% through 2 mm of Filtek Universal, whereas light from PW decreased by only 36.8% through Transcend. The highest temperature increases from the LCU combined with the exothermic reaction occurred for Transcend, and overall, no significant differences were detected between Filtek Universal and Tetric Evoceram (p = 0.9756). Transcend achieved the highest VH values at the top and bottom surfaces. The PinkWave used for 10 s produced the largest temperature increase (20.2℃) in Transcend. The Monet used for 1 s produced the smallest increase (7.8℃) and the lowest bottom:top VH ratios.

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Acknowledgements

The authors would like to thank Braden Sullivan for his assistance in collecting the data and Professor D. Labrie for his input into the study design. This study was supported by Mitacs travel grant (IT26826). It was also financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brazil (CAPES) – Finance Code 001 and an internal research fund grant from the Faculty of Dentistry, Dalhousie University.

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  1. Department of Dental Clinical Sciences, Dalhousie University, Halifax, NS, B3H 4R2, Canada

    Cristiane Maucoski & Richard Bengt Price

  2. Department of Restorative Dentistry, The State University of Ponta Grossa, 4748 General Carlos Cavalcanti Av., Ponta Grossa, Parana, 84051-130, Brazil

    Cristiane Maucoski & Cesar Augusto Galvão Arrais

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Maucoski, C., Price, R.B. & Arrais, C.A.G. Temperature changes and hardness of resin-based composites light-cured with laser diode or light-emitting diode curing lights. Odontology 111, 387–400 (2023). https://doi.org/10.1007/s10266-022-00745-1

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