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Lasers in Medical Science
Published in: Lasers in Medical Science 4/2010

01-07-2010 | Original Article

Comparative analysis of root surface smear layer removal by different etching modalities or erbium:yttrium–aluminum–garnet laser irradiation. A scanning electron microscopy study

Authors: Letícia Helena Theodoro, Denise Maria Zezell, Valdir Gouveia Garcia, Patrícia Haypek, Maria José Hitomi Nagata, Juliano Milanezi de Almeida, Carlos de Paula Eduardo

Published in: Lasers in Medical Science | Issue 4/2010

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Abstract

The purpose of this study was to evaluate the effect of erbium:yttrium–aluminum–garnet (Er:YAG) laser (2.94 μm) irradiation on the removal of root surface smear layer of extracted human teeth and to compare its efficacy with that of citric acid, ethylenediamine tetra-acetic acid (EDTA), or a gel containing a mixture of tetracycline hydrochloride (HCl) and citric acid, using scanning electron microscopy (SEM). Thirty human dentin specimens were randomly divided into six groups: G1 (control group), irrigated with 10 ml of physiologic saline solution; G2, conditioned with 24% citric acid gel; G3, conditioned with 24% EDTA gel; G4, conditioned with a 50% citric acid and tetracycline gel; G5, irradiated with Er:YAG laser (47 mJ/10 Hz/5.8 J/cm2/pulse); G6, irradiated with Er:YAG laser (83 mJ/10 Hz/10.3 J/cm2/pulse). Electron micrographs were obtained and analyzed according to a rating system. Statistical analysis was conducted with Kruskal–Wallis and Mann–Whitney tests (P < 0.05). G1 was statistically different from all the other groups; no statistically significant differences were observed between the Er:YAG laser groups and those undergoing the other treatment modalities. When the two Er:YAG laser groups were compared, the fluency of G6 was statistically more effective in smear layer removal than the one used in G5 (Mann–Whitney test, P < 0.01). Root surfaces irradiated by Er:YAG laser had more irregular contours than those treated by chemical agents. It can be concluded that all treatment modalities were effective in smear layer removal. The results of our study suggest that the Er:YAG laser can be safely used to condition diseased root surfaces effectively. Furthermore, the effect of Er:YAG laser irradiation on root surfaces should be evaluated in vivo so that its potential to enhance the healing of periodontal tissues can be assessed.
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Metadata
Title
Comparative analysis of root surface smear layer removal by different etching modalities or erbium:yttrium–aluminum–garnet laser irradiation. A scanning electron microscopy study
Authors
Letícia Helena Theodoro
Denise Maria Zezell
Valdir Gouveia Garcia
Patrícia Haypek
Maria José Hitomi Nagata
Juliano Milanezi de Almeida
Carlos de Paula Eduardo
Publication date
01-07-2010
Publisher
Springer-Verlag
Published in
Lasers in Medical Science / Issue 4/2010
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-009-0665-4

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