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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

Publication:
JOLA
Spring 2007
Volume 7 , Issue 1

Pages: 45-53
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In Vitro Evaluation of Er:YAG and Nd:YAG Laser Irradiation on Root Canal Walls - A Preliminary Study

Goya, Claudia / da Silveira, Bruno Lopes / Aranha, Ana Cecília Corrêa / Zezell, Denise Maria / Matsumoto, Koukichi / Eduardo, Carlos de Paula

Purpose: This study aimed to compare the in vitro effects of Nd:YAG and Er:YAG laser irradiation on root canal walls using scanning electron microscopy (SEM), and evaluate apical leakage and temperature changes in external root surfaces. Materials and Methods: Seventy-four recently extracted human teeth with single, straight roots were used. The teeth were prepared to 1 mm short of the apical foramen by a conventional technique using K-files and assigned to different groups: G1) no laser irradiation/control; G2) Nd:YAG laser/helicoidal technique; G3) Nd:YAG laser/vertical technique; G4) Er:YAG laser/helicoidal technique; G5) Er:YAG laser/vertical technique; G6) Er:YAG and Nd:YAG laser/helicoidal technique; G7) Er:YAG and Nd:YAG laser/vertical technique. The Nd:YAG laser parameters were 100 mJ, 15 Hz, 0.5 J/cm2, and those of the Er:YAG laser were 160 mJ, 10 Hz, 0.9 J/cm2, for four times at 2 mm/s, with 20-s intervals. Temperature changes were recorded thermographically. All teeth were examined by light microscopy or scanning electron microscopy (SEM). Results: No apical leakage was observed in the teeth irradiated with Nd:YAG laser alone or in association with Er:YAG laser. However, in the teeth irradiated with Er:YAG laser, more pronounced leakage was observed. SEM observation showed that Nd:YAG laser irradiation caused melting and crystallization on dentin surfaces. Er:YAG laser samples showed a clean, debris-free surface with opened dentinal tubules. Specimens irradiated by the combination of the two lasers showed a melted layer covering the dentinal tubules. The temperature increase did not exceed 6°C. Conclusions: This study demonstrated that Nd:YAG laser irradiation with or without adjunct Er:YAG laser irradiation is a potentially suitable means of root canal treatment, since morphological alterations are desirable and it did not cause thermal damage to adjacent tissues.

Keywords: apical leakage, dentin, dentinal tubules, endodontics, Er:YAG, Nd:YAG, scanning electron microscopy, thermographic evaluation

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