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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
Summer 2009
Volume 9 , Issue 2

Pages: 101 - 109
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A Study on Root Canal Cleansing by Nd:YAG Laser with Black Dye Solution

Minamisako, Mariana Comparotto / Kinoshita, Jun-Ichiro / Matsumoto, Koukichi / Stolf, Daiana Paula / Marques, Jose Luiz Lage

Purpose: To investigate in vitro the removal of smear layer, plug, debris, and pulp tissue by Nd:YAG irradiation with different potencies and times, with or without black ink on the apical root canal wall. Materials and Methods: Twenty-five extracted human teeth were divided into 5 groups after endodontic treatment. G1: no laser irradiation, control; G2: Nd:YAG laser 1 W, 1 s, 20 pps, 50 mJ; G3: Nd:YAG laser 2 W, 1 s, 20 pps, 50 mJ; G4: Nd:YAG laser 1 W, 2 s, 20 pps, 50 mJ, black ink; G5: Nd:YAG laser 2 W, 1 s, 20 pps, 50 mJ, black ink. All teeth were sectioned and analyzed under light microscope and SEM. Results: Statistically significant differences were observed among the 5 groups, p = 0. 0027(p < 0.05). No significant difference was found between G1 (control) and G2 (1 W, 1 s), p = 0.8345 (p > 0.05), nor between G3 (2 W, 1 s) and G5 (2 W, 1 s, black ink), p = 0.0758 (p > 0.05). However, a marked difference was seen between G4 (1 W, 2 s, black ink) and G5 (2 W, 1 s, black ink), p = 0.0367 (p < 0.05). A statistically significant difference (p < 0.05) was found between G3 (no black ink) and G5 (black ink) regarding carbonization. Conclusion: Nd:YAG irradiation was effective in the removal of smear layer, plug, debris, and pulp tissue, even without an initiator (black ink) in the potencies of 1 W, 2 s and 2 W, 1 s, but the use of black ink caused less carbonization in the potency of 2 W and 1 s, which may suggests it is safer. However, the treatment with 1 W, 2 s was considered more efficient than the treatment with 2 W, 1 s. Nevertheless, Nd:YAG laser treatment was not sufficiently effective with 1 W, 1 s.

Keywords: Nd:YAG laser, black ink, smear layer, plug, debris, carbonization

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