The Radicular Dentine Temperature during Laser Irradiation: An Experimental Study

Abstract

The detoxification and sterilization radicular surfaces that have been produced by periodontal diseases could be accomplished after polishing (root planing) using the thermal elevation resulting from CO2 laser on continuous emission. In vitro experiments reveal that thermal elevations reached on the surfaces or in the depth are proportional to the dispersed energy. The thermal elevation in the depth (0.5-1 mm from the impact point) remained moderate because of the water absorption potentials of the radiations. Energies from 2 to 4.5 J can help obtain the combination of surface temperature elevation, which allows detoxification, and of a thermal elevation in the depth, compatible with vital tissues. This energy has to be delivered at an application time under 0.6 sec in continuous mode.

Effect of Er:YAG and Diode Laser Irradiation on the Root Surface: Morphological and Thermal Analysis

“…Other factors such as morphological or calcic type can also affect the results. 21 SEM observation of the Er:YAG laser-treated specimens revealed rough surfaces, but without residual deposits or any sign of smear layer formation. In contrast, SEM evaluation of diode-lased root surfaces showed a superficial smear layer composed of necrotic cells, organic matrix, and dentinal particles.…”

Analysis of laser transmission and thermal effects on the inner root surface during periodontal treatment with a 940-nm diode laser in anin vitropocket model

“…In the case of short exposure times and low power applied, convection plays a minor role in heat transport in tissues. 28,29 Although these modifications in geometry and mass have an influence on heat conduction 27 and heat capacity, no significant differences in the temperature rise between split teeth and intact teeth have been reported in the literature. 27 To exclude thickness variations, the roots have to be sectioned prior or after the experiments.…”

Histologic Evaluation of Three Methods of Periodontal Root Surface Treatment in Humans

“…19,24 EDTA and citric acid were also effective in removing the smear layer, but they exposed tunnel-shape dentinal tubules. A low-power beam and a short exposure time has been suggested also by Simeone 25 for hard tissue conditioning because these conditions limit temperature increases on the surface, where it is necessary to obtain detoxification, and in depth, where damage to vital tissues might be caused. In the Simeone study, various power and application time combinations were tried in order to observe cooling rate on the surface structure.…”