In vitro evaluation of Er:YAG and Nd:YAG laser irradiation on root canal walls

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2007
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The Journal of Oral Laser Applications
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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.

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GOYA, CLAUDIA; SILVEIRA, BRUNO L. da; ARANHA, ANA C.C.; ZEZELL, DENISE M.; MATSUMOTO, KOUKICHI; EDUARDO, CARLOS de P. In vitro evaluation of Er:YAG and Nd:YAG laser irradiation on root canal walls: a preliminary study. The Journal of Oral Laser Applications, v. 7, n. 1, p. 45-53, 2007. Disponível em: http://repositorio.ipen.br/handle/123456789/33332. Acesso em: 29 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.

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