Temperature changes on the root surfaces of mandibular incisors after an 810-nm high-intensity intracanal diode laser irradiation

Abstract

2012Temperature changes on the root surfaces of mandibular incisors after an 810-nm highintensity intracanal diode laser irradiation JOURNAL OF BIOMEDICAL OPTICS, BELLINGHAM, v. 17, n. 1, supl Abstract. Temperature changes caused by laser irradiation can promote damage to the surrounding dental tissues. In this study, we evaluated the temperature changes of recently extracted human mandibular incisors during intracanal irradiation with an 810-nm diode laser at different settings. Fifty mandibular incisors were enlarged up to an apical size of ISO No. 40 file. After the final rinse with 17% ethylenediaminetetraacetic acid, 0.2% lauryl sodium sulfate biologic detergent, and sterile water, samples were irradiated with circular movements from apex to crown through five different settings of output power (1.5, 2.0, 2.5, 3.0, and 3.5 W) in continuous mode. The temperature changes were measured on both sides of the apical and middle root thirds using two thermopar devices. A temperature increase of 7°C was considered acceptable as a safe threshold when applying the diode laser. Results: The results showed that only 3.5-W output power increased the outer surface temperature above the critical value. Conclusion: The recommended output power can be stipulated as equal to or less than 3 W to avoid overheating during diode laser irradiation on thin dentin walls.

Effect of Passive Ultrasonic Irrigation, Er,Cr:YSGG Laser, and Photon-Induced Photoacoustic Streaming against Enterococcus faecalis Biofilms in the Apical Third of Root Canals

“…The authors cautioned that certain parameter settings of laser-assisted irrigation might elevate the root surface temperature beyond the safety threshold pertaining to periodontium damage [ 36 ]. In this study, irrigant was used in the PIPS and WTL group as a coolant, aiming to ameliorate the temperature rise caused by the laser energy.…”

Effects of mechanical instrumentation and chemical irrigation on the root canal dentin and surrounding tissues

“…Temperature changes during intracanal laser application have been reported to result in bone necrosis, lysis of cementum, and ankylosis . However, the intracanal use of an 810‐nm diode laser in continuous mode with 1, 1.5, 2, 2.5, 3, and 3.5 W resulted in a temperature increase at the outside of the root of 7°C, which was rated acceptable . An 810‐nm diode laser was used in 50 human teeth with different output parameters (0.6–1.5 W; 10–20 ms, continuous and intermittent use) and temperature changes were measured at the outside of the roots.…”

Investigation of Thermal Changes in Dental Soft Tissue under 810 nm Low Level Diode Laser Radiation in Osseointegration

“…The duration of exposure results effect on increasing temperature that may cause the tissue changes in structure and composition. These changes may range from denaturation to vaporization and carbonization, and even melting followed by recrystallization in the case of hard tissue [7,10,11].…”