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Lasers in Dental Science
Published in: Lasers in Dental Science 2/2018

01-06-2018 | Original Article

Temperature elevation during root canal treatment with a 445-nm diode laser—an in vitro study

Authors: Abeer Alshamiri, Rene Franzen, Norbert Gutknecht

Published in: Lasers in Dental Science | Issue 2/2018

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Abstract

Objective

This study investigated the thermal effects of a 445-nm diode laser on tooth roots of endodontic treatment.

Material and methods

A total of 15 human single-rooted extracted teeth were included in the survey. Samples were sectioned at the cementoenamel junction. The root canals were instrumented using a rotary system. Each root was fitted into a resin mold and was fixed in a vertical position using clamps. All samples were placed on a support in a thermal path at 37 °C. The root canals were randomly divided into three groups (n = 5 each): samples were irradiated with 0.6 W continuous wave (CW), 0.4 W CW, and 1.2 W gated mode, at a repetition rate of 10 Hz with a pulse duration of 50 ms. The time-dependent temperature elevations of the cervical, middle, and apical thirds of the roots were recorded at a sampling rate of 2 Hz during laser irradiation with a K-type thermocouple measurement system.

Results

The mean temperature rise inside the roots in this study was below 10 °C, whereas the maximum temperature rise of 9.83 °C (0.6 W CW) and 9.81 °C (1.2 W gated mode, repetition rate 10 Hz, and pulse duration 50 ms) was registered in lower incisors, and 4.97 °C was detected at 0.4 W CW. The thermal changes seen in the apical thirds of the root were statically significantly (p < 0.001) and were greater than those at the coronal and middle thirds.

Conclusion

The results of this study suggest that 445-nm diode lasers may provide a safe temperature for endodontic applications.
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Metadata
Title
Temperature elevation during root canal treatment with a 445-nm diode laser—an in vitro study
Authors
Abeer Alshamiri
Rene Franzen
Norbert Gutknecht
Publication date
01-06-2018
Publisher
Springer International Publishing
Published in
Lasers in Dental Science / Issue 2/2018
Electronic ISSN: 2367-2587
DOI
https://doi.org/10.1007/s41547-018-0023-6

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