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Temperature Rise in Curing Modes of Two Different Dental Light-Curing Units: The Importance of Heating Rate

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Abstract

The heat generated in the process of light curing may cause irreversible damage to the dental pulp. This study aimed to assess heat transfer in the process of irradiation of a dentin disk by using different modes of quartz-tungsten halogen (QTH) and light-emitting diode (LED) dental curing units. The surface temperature was measured by an infrared (IR) thermometer following light curing with standard, ramp, boost, and bleaching modes of a QTH curing unit, and high, soft, and pulse modes of a LED curing unit. Since the maximum temperature rise alone is not sufficient to study the thermal damage to the pulp tissue, we also assessed the temperature rise profile and heating rate, in addition to the maximum temperature rise in this study. The results showed that decreasing the duration of light curing effectively decreased the risk of pulpal damage. Shorter radiation modes, such as the 10 s standard mode and the 10 s boost curing mode of the QTH curing unit, and the 5 s high mode and the 10 s pulse mode of the LED curing unit, all had the lowest risk of thermal damage to the pulp.

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Acknowledgements

The authors would like to thank Dr. Mojdeh Kalantar Motamedi, for all her invaluable help and advice throughout this research.

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Author notes

  1. Ahmad Soori and Faezeh Soori have contributed equally to this work and designated as co-first authors.

Authors and Affiliations

  1. School of Mechanical Engineering, College of Engineering, University of Tehran, North Kargar St., Tehran, Iran

    Ahmad Soori & Farshad Kowsary

  2. Islamic Azad University Dental Branch of Tehran, Tehran, Iran

    Ahmad Soori

  3. Dental School, Hamadan University of Medical Sciences, Hamadan, Iran

    Faezeh Soori

  4. Department of Restorative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran

    Shahin Kasraei

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  1. Ahmad Soori
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  2. Faezeh Soori
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All authors participated in writing the main text and read the manuscript.

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Correspondence to Farshad Kowsary.

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Ethical Approval

The Ethics Committee of the Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, approved this study (Code: IR.SBMU.DRC.REC.1398.097).

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Soori, A., Soori, F., Kowsary, F. et al. Temperature Rise in Curing Modes of Two Different Dental Light-Curing Units: The Importance of Heating Rate. Int J Thermophys 44, 59 (2023). https://doi.org/10.1007/s10765-023-03166-6

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  • DOI: https://doi.org/10.1007/s10765-023-03166-6

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