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Quintessence Publishing: Journals: JOLA


The Journal of Oral Laser Applications

Edited by Prof Dr Andreas Moritz and Prof G. Lynn Powell

Official publication of the European Society for Oral Laser Applications

ISSN (print) 1473-7809 • ISSN (online) 1867-5611

Summer 2005
Volume 5 , Issue 2

Pages: 91-96
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Morphological Analysis of Root Canal Walls After Er:YAG and Nd:YAG Laser Irradiation: A Preliminary SEM Investigation

Müller Ramalho, Karen/Martins Marques, Márcia/Apel, Christian/Thais Meneguzzo, Daiane/de Paula Eduardo, Carlos/Gutknecht, Norbert

Purpose: To evaluate the effect of laser irradiation (Nd:YAG and Er:YAG) after conventional endodontic treatment on the cleaness of root canal walls. Materials and Methods: The roots of 9 extracted single-rooted human teeth were conventionally prepared and randomly divided into 3 groups (n = 3 per group): 1. control, not irradiated; 2. Nd:YAG laser irradiation (100 mJ; 1.5 W; 15 Hz, 124.4 J/cm2); 3. Er:YAG laser irradiation (120 mJ, 15 Hz, 1.8 W, 108.7 J/cm2). The teeth were irradiated 3 times with rotational movements in the apical-coronal direction, at a speed of 2 mm of root canal per second. The teeth were bisected longitudinally and prepared for scanning electron microscopy (SEM). Results: Independent of the experimental group, both clean and smear-layer-covered areas were observed in the same sample and the same root canal third. The samples treated with Er:YAG laser mostly presented clean areas. The Nd:YAG laser apparently removed less smear layer than the Er:YAG laser, and left areas completely covered by debris and smear layer. The control root canal walls predominantly exhibited areas covered by smear layer. Conclusion: Complete cleaning of root canal walls with Nd:YAG and Er:YAG laser radiation with the power settings used here was not possible. Although the cleaning capacity of laser could improve conventional endodontic treatment, there is still a need to develop devices which can irradiate root canal walls in their entirety.

Keywords: Er:YAG laser, Nd:YAG laser, root canal, scanning electron microscopy

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