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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)
Lasers in Dental Science – Springer Journals
Published: Feb 28, 2018
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