Intrapulpal temperature rise following two dentin hypersensitivity treatment protocols using diode laser: a randomized clinical trial



This study sought to assess intrapulpal temperature rise following two dentin hypersensitivity (DH) treatment protocols using the 810-nm diode laser.

Materials and methods

In this randomized clinical trial, 45 maxillary and mandibular incisors and premolars were randomly divided into three groups primary phase (no intervention), 1 W diode laser for 10 s (group 1), and 0.5 W diode laser for 60 s (group 2). In all groups, the access cavity was prepared, and the thermocouple was placed in the pulp chamber and fixed by Cavit. Intrapulpal temperature was measured immediately after access cavity preparation and every minute for 10 min in the primary phase. In the second phase group 1, the temperature was measured with 2-s intervals after irradiation for 10 s and group 2, with 15-s intervals after irradiation for 60 s. Data were analyzed using repeated measures ANOVA and t test (P ≤ 0.05).


The mean stabilized baseline temperature was 32 °C. The mean temperature rise was < 5 °C, with no significant difference between groups 1 and 2 (P = 0.6). However, 17% and 11% of teeth in groups 1 and 2, respectively, showed a temperature rise > 5 °C. In both experimental groups, the stabilized temperature after laser irradiation was significantly higher than the baseline temperature (P < 0.05), with no significant difference between the two groups (P > 0.05). Time to stabilize temperature after irradiation in group 1 was significantly shorter than that in group 2 (P < 0.05).


Both the tested protocols seem to be safe regarding intrapulpal temperature rise. However, considering the slight overheating observed in a small percentage of teeth in both groups, caution must be taken in the use of these protocols for the treatment of DH.

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Corresponding author

Correspondence to Delaram Bineshmarvasti.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This clinical trial was approved in the Ethics Committee of Islamic Azad University, School of Dentistry, and Tehran Faculty (IR.IAU.DENTAL.REC.1395.37) and registered in the Iranian Registry of Clinical Trials (IRCT20170923036331N3).

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All patients signed informed consent forms prior to enrollment.

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Khalilak, Z., Vatanpour, M. & Bineshmarvasti, D. Intrapulpal temperature rise following two dentin hypersensitivity treatment protocols using diode laser: a randomized clinical trial. Laser Dent Sci (2021).

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  • Dentin hypersensitivity
  • Diode laser
  • Intrapulpal temperature