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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/16351

Title: Influence of Laser Phototherapy (λ660 nm) on the Outcome of Oral Chemical Carcinogenesis on the Hamster Cheek Pouch Model: Histological Study
Other Titles: Photomedicine and Laser Surgery
Authors: Monteiro, Juliana S. de C.
Pinheiro, Antonio Luiz Barbosa
Oliveira, Susana C. P. S. de
Aciole, Gilberth Tadeu dos Santos
Sousa, José Augusto Cardoso
Cangussu, Maria Cristina Teixeira
Santos, Jean Nunes dos
Keywords: Laser;Phototherapy;Carcinogenesis
Issue Date: 2011
Abstract: This study aimed to evaluate, histologically, the effect of low-level laser therapy (LLLT) (λ660 nm) on DMBA chemically induced lesions of the oral mucosa of hamsters. Background data: Squamous cell carcinoma (SCC) is the most common neoplasm of the oral cavity. It is aggressive, highly proliferative, invasive, and metastatic. There is evidence that LLLT similarly affects neoplasic and non-neoplasic cells. Methods: Cancerous lesions were induced on the cheek pouch of 15 golden Syrian hamsters by using DMBA 3 times a week for 8 weeks. At the end of the cancer induction (8 weeks), animals in G1 were killed and the presence of tumors confirmed. Animals in G3 were irradiated (λ660 nm, 30 mW, CW, Ø=3 mm, area: 0.07 cm2, 424 mW/cm2, 133 sec, 56.4 J/cm2, 4 J) at every other day for 4 weeks. G2 received no interventions for the same period. Samples were taken and underwent histological analysis by light microscopy. Results: GI showed 100% well-differentiated SCC. G2 showed 20% moderately differentiated and 80% well-differentiated SCC. G3 showed 40% well-differentiated, 40% poorly differentiated, and 20% moderately differentiated SCC. Significant differences (p=0.02) in the amount of well-differentiated SCC were seen between G1 and G3 and between G3 and G2 (p=0.04). Significant difference was also seen between G3 and G1 and G2 with regard to the amount of poorly differentiated tumors (p=0.04). Conclusions: It is concluded that LLLT, within the parameters used in the present study, caused a significant progression of the severity of SCC in the oral cavity of hamsters.
Description: Texto completo: acesso restrito. p. 741-745
URI: http://repositorio.ufba.br/ri/handle/ri/16351
ISSN: 1549-5418
Appears in Collections:Artigos Publicados em Periódicos (Odontologia)

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