title: Effect of laser (λ 660 nm) and LED (λ 630 nm) photobiomodulation on formocresol-induced oral ulcers: a clinical and histological study on rodents.
abstract: The aim of this study was to evaluate, clinically and histologically, the influence of laser and LED photobiomodulation in the healing of formocresol-induced oral mucosa ulcers of rats. We used 60 Wistar rats in which oral ulcers were induced on the gingiva of the lower incisors. Forty-eight hours after inducing the ulcers, the animals were divided into three groups: laser, LED, and untreated. Animals from the laser group received irradiation with GaAlAs, 660 nm, CW, 40 mW, φ 4 mm(2), 4.8 J/cm(2). Animals from the LED group received irradiation with InGaAIP, 630 nm, 150 mW, 4.8 J/cm(2), 0.8 cm spot. Forty-eight hours after oral ulcer induction, both irradiations were applied in a punctuate manner in the center of the ulcer at 48-h interval until the end of the experimental period. The animals were killed at 3, 5, 7, and 11 days after day 0. The results of the clinical evaluation showed that the laser and LED phototherapies were able to accelerate the healing of formocresol-induced oral ulcers, which occurred first in the laser group (ANOVA, p < 0.05). Histologically, there was a slight variation between LED and laser therapy; therefore, the laser group proved to be effective in accelerating wound healing, especially at 5 days, whereas the LED group was more effective at the end of the experimental period. It was concluded that laser and LED photobiomodulation were effective in accelerating the healing of formocresol-induced oral ulcers in both clinical and histological aspects.
authors.affiliation: Center of Biophotonic and Division of Endodontic, School of Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil.
authors.forename: Fabiola Bastos
authors.initials: FB
authors.lastname: de Carvalho
authors.forename: Aline Silva
authors.initials: AS
authors.lastname: Andrade
authors.forename: Luis Cardoso
authors.initials: LC
authors.lastname: Rasquin
authors.forename: Isabele Vieira
authors.initials: IV
authors.lastname: de Castro
authors.forename: Maria Cristina Teixeira
authors.initials: MC
authors.lastname: Cangussu
authors.forename: Antônio Luiz Barbosa
authors.initials: AL
authors.lastname: Pinheiro
authors.forename: Jean Nunes
authors.initials: JN
authors.lastname: dos Santos
mesh_terms: D000818:Animals; D003094:Collagen / Q000378:metabolism; D005566:Formocresols; D028022:Low-Level Light Therapy; D008297:Male; D019226:Oral Ulcer / Q000139:chemically induced / Q000473:pathology* / Q000532:radiotherapy*; D017208:Rats, Wistar; D014945:Wound Healing / Q000528:radiation effects
chemical_list: D005566:Formocresols; C031025:formocresol; D003094:Collagen