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Indexed/Abstracted in: EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1782
Marchiori Farret A. 1, Marchiori Farret M. 2, Gerhardt De Oliveira M. 3, Blessmann Weber J. B. 3
1 Department of Maxillofacial Surgery, Pontifícia Universidade do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil;
2 Department of Orthodontics, PUCRS, Brazil, Pontifícia Universidade do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil;
3 School of Dentistry, Pontifícia Universidade do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil
Aim and methods. This study evaluated the dentin surface of 20 bovine mandibular incisors whose roots were sectioned using a high-speed bur or Er:YAG laser and irradiated with Nd:YAG laser. Specimens were divided into two groups: in the first, teeth were sectioned using a high-speed bur under constant cooling; in the second, teeth were sectioned using Er:YAG laser (pulse mode, 10 Hz, 500 mJ [5W]) applied at a distance of about 3 mm from the tooth under constant air and water spray cooling. Both groups had two surfaces; one treated with Nd:YAG laser, and the other with no surface treatment. Scanning electron microscopy (SEM) was used to obtain images of the surfaces, and energy dispersion spectroscopy (EDS) produced data about their molecular structure. The nonparametric Kruskal-Wallis test was used for comparisons between the four groups. The level of significance was set at 5%.
Results. SEM analyses revealed that surfaces sectioned using a high-speed bur had a smoother surface and fewer open dentinal tubules than the surfaces sectioned using Er:YAG laser.
Conclusion. Resection with a bur may reduce dentin permeability in comparison with Er:YAG laser alone or in combination with Nd:YAG laser used for surface treatment.