Increase in pulp chamber temperature during irradiation with high-power diode laser: an in vitro study
DOI:
https://doi.org/10.5335/rfo.v30i1.17558Keywords:
Temperature, Semiconductor Lasers, Dental Pulp CavityAbstract
Objective: The aim of this in vitro study was to evaluate the variation in pulp chamber temperature during diode laser irradiation using different power and time parameters. Methods: Ten human mandibular central incisors (n=10) were selected, and their root canals were enlarged and filled with thermal paste. The root portion remained submerged in a thermal bath at 37°C, and a thermocouple sensor connected to a digital thermometer was placed inside the pulp chamber to measure the temperature variation. The diode laser (810 nm) was applied at a distance of 1 cm from the dental surface, using power settings of 1, 2, and 3 W in continuous mode, for 5, 10, 15, 20, and 25 seconds. For each power setting and for each tooth, five temperature measurements were taken in addition to the baseline measurement. Data were analyzed using analysis of variance (ANOVA) and Tukey’s post-hoc test (α = 5%). Results: A statistically significant difference was observed between all temperature readings compared to the baseline, as well as among all time intervals, indicating a progressive temperature increase over time for all three tested power settings. Furthermore, higher power resulted in greater temperature elevation (P ≤ 0.05). Conclusion: The irradiation parameters used in this study led to a progressive increase in pulp chamber temperature, without exceeding the 5.5 °C threshold associated with irreversible pulpal damage.
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