Abstract
Aim: The present study evaluated the magnitude of temperature changes in the tooth during cavitation produced by an Er,Cr:YSGG laser. Methods: The root canal of a single extracted maxillary canine was enlarged to a size 30/.02 file. Four thermocouples were attached to the tooth: one to the surface of the root and three inserted into the canal at 3, 9, and 15 mm from the apical foramen, respectively. The tooth was placed in a plastic container at room temperature around 25°C. The tooth was processed as follows. In the EDTA condition, the tooth was irrigated with 17% EDTA; in the NaOCl condition, the tooth was irrigated with 3% NaOCl; and to analyse the effect of different thicknesses of dentin, the tooth was irrigated with tap water. In all conditions, the irrigants were activated at 2 W for 120 seconds. Results: The mean temperature was 25.2°C to 27.1°C and the temperature ranged from 25.0°C to 29.6°C. The temperature elevation measured during cavitation generated by the laser didnot exceed 5°C. Conclusions: The magnitude of the temperature changes in the root canal and at the surface of the tooth did not exceed 5°C when laser-driven irrigation was used to produce cavitation in the root canal.
Highlights
Shaping of the root canal has improved with advances in metal technology
Aim: The present study evaluated the magnitude of temperature changes in the tooth during cavitation produced by an Er,Cr:YSGG laser
Vapour lock that results in trapped air in the apical third of the root canal may hinder the exchange of irrigants and decrease the efficacy of debridement [3]
Summary
Shaping of the root canal has improved with advances in metal technology. owing to the anatomical complexity and irrigurarity of teeth, cleaning of the canal still relies heavily on the adjunctive use of chemical rinsing and soaking solutions [1]. Hand irrigation is not sufficiently effective in the apical third of the root canal, or in oval extensions, isthmuses, and anastomoses [2]. The use of lasers has been proposed as an alternative to conventional approaches to cleaning and disinfection [2]. Both ultrasound and pulsed middle infrared lasers cause cavitation and pressure waves within the root canal space [4]. Various types of laser (such as Diode, Nd:YAG, Er:YAG or CO2) have been investigated in an attempt to develop improved treatment methods, and the performance of lasers that are used in the field of dentistry has been improving [5]
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