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In vitro temperature changes in the pulp chamber caused by laser and Quadwave LED-light curing units

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Abstract

The study evaluated the pulp temperature (PT) increase in Class I and V preparations when exposed to the Monet Laser (for 1 and 3 s), the PinkWave (for 3 and 10 s), the Valo Grand (for 3 and 10 s), the PowerCure, (for 3 and 10 s) and the SmartLite Pro (for 10 s). Non-retentive Class I and Class V cavities were prepared in one molar fixed in an acrylic plate and positioned in a warm water bath. The PT baseline was kept at 32 °C to simulate physiological conditions. Two T-type thermocouples were inserted through the roots into the pulp chamber in two positions: close to the pulp horn and the buccal wall close to the Class V cavity. The water flow was adjusted to 0.026 mL/min, and real-time temperature data were collected every 0.5 s. PT measurements were made with the tip of the LCU 0 and 6 mm away from the tooth surface. The radiant exitance (mW/cm2) and radiant exposure (J/cm2) were calculated. One-way ANOVA compared the effect of the pulpal flow, and ΔT values were subjected to two-way ANOVA, followed by Scheffe’s post hoc tests. The Monet Laser used for 3 s and the PinkWave used for 10 s produced the greatest PT rise in the Class I cavity. The simulated pulpal flow did not influence the PT rise. Overall, cavities exposed at the 0 mm distance had higher ΔT values than groups at 6 mm distance. The placement of a rubber dam for Class V restorations may prevent positioning LCUs directly over the cavity, which may affect the rise in PT.

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Data availability

The data that support the findings of this study are available from the corresponding author, CAG Arrais, upon reasonable request.

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Acknowledgements

This study was supported by a Mitacs travel grant (IT29166), a Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brazil (CAPES)—Finance Code 001grant, and an internal research fund grant from the Faculty of Dentistry, Dalhousie University.

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Authors and Affiliations

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

    Cristiane Maucoski, Richard Bengt Price & Braden Sullivan

  2. Department of Restorative Dentistry, 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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  1. Cristiane Maucoski
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Correspondence to Cesar Augusto Galvão Arrais.

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Approval was obtained from the Health Sciences Research Ethics Board of Dalhousie University, Halifax, NS, Canada (#2021-5703).

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Maucoski, C., Price, R.B., Arrais, C.A.G. et al. In vitro temperature changes in the pulp chamber caused by laser and Quadwave LED-light curing units. Odontology 111, 668–679 (2023). https://doi.org/10.1007/s10266-022-00780-y

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