Thermal Effects of Laser Assisted Endodontic Treatment on The External Root Surface of Deciduous Teeth (in vitro study).

Abstract

The aim of this study was to determine the possible temperature increase on root surface of deciduous human teeth after intra-root canal laser irradiation with different chopped modes to clarify the thermal safety of these modes. fifteen freshly extracted unrestorable deciduous molars were used. Immediately after extraction, teeth cleaned, root canal perpetrated, laser irradiation was done in mesial root using dual wavelengths 980/810 nm InGaAs diode laser (using a 200 ?m fiber, 800mW output power. Room temperature were raised in the laboratory to 37C to simulate body temperature, for each tooth three chopped program were used successively: 25ms on 75ms off, 50ms on and 50ms off, and 75ms on 25ms off. Each round laser irradiated for 5 seconds then 10 seconds pause. At the very last second temperature was measured using infrared thermometer. This procedure for the three groups was repeated but with non-stop laser irradiation with no cooling intervals.
It was concluded that 30/70 ms layout can be used safely to assist root canal disinfection.