Comparison of dentin root canal permeability and morphology after irradiation with Nd:YAG, Er:YAG, and diode lasers

Autor(es)

Esteves-Oliveira, Marcella ^[1] ; de Guglielmi, Camila A. B. ^[2] ; Ramalho, Karen Muller ^[3] ; Arana-Chavez, Victor E. ^[3] ; de Eduardo, Carlos Paula ^[2]

Afiliação do(s) autor(es)

^[1] Rhein Westfal TH Aachen, Dept Conservat Dent Periodontol & Prevent Dent, D-52074 Aachen - Germany

^[2] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Div Oral Biol, Sch Dent, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 25, n. 5, p. 755-760, SEP 2010.
• Citações Web of Science: 18

Resumo

The aim of this study was to compare the effects of Nd:YAG, Er:YAG, and diode lasers on the morphology and permeability of root canal walls. The three laser wavelengths mentioned interact differently with dentin and therefore it is possible that the permeability changes caused will determine different indications during endodontic treatment. Twenty-eight human single-rooted teeth were instrumented up to ISO 40 and divided into four groups: group C, control (GC), non-laser irradiated; group N (GN), irradiated with Nd:YAG laser; group E (GE), with Er:YAG laser and group D (GD) with diode laser. After that, the roots were filled with a 2% methylene blue dye, divided into two halves and then photographed. The images were analyzed using Image J software and the percentage of dye penetration in the cervical, middle, and apical root thirds were calculated. Additional scanning electron microscopy (SEM) analyses were also performed. The analysis of variance (ANOVA) showed significant permeability differences between all groups in the middle and cervical thirds (p < 0.05). The Tukey test showed that in the cervical third, GN presented means of dye penetration statistically significantly lower than all of the other groups. In the middle third, GE and GD showed statistically higher dye penetration means than GC and GN. SEM analysis showed melted surfaces for GN, clean wall surfaces with open dentinal tubules for GE, and mostly obliterated dentinal tubules for GD. Er:YAG (2,094 nm) laser and diode laser (808 nm) root canal irradiation increase dentinal permeability and Nd:YAG (1,064 nm) laser decreases dentin permeability, within the studied parameters. (AU)

• Processo FAPESP: 97/10823-0 - Projeto Er: YAG laser em odontologia para pesquisas laboratoriais e clínicas
• Beneficiário: Carlos de Paula Eduardo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Equipamentos