Prof. Augusto C. Ribeiro Figueiredo Profile

Prof. Augusto C. Ribeiro Figueiredo

at Univ Federal de Goiás

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Proceedings Article | 30 January 2012 Paper

Low level laser intensity improves propulsive appliance effects on condylar cartilage

Augusto C. Figueiredo, Fernanda C. dos Santos, Lucas Capeletti, Marcos V. Galdino, Renan Araújo, Mara Marques

Proceedings Volume 8208, 82080T (2012) https://doi.org/10.1117/12.909398

KEYWORDS: Cartilage, Bone, Laser therapeutics, Tissues, Statistical analysis, Laser irradiation, Laser dentistry, Biological research, Modulation, Wound healing

Read Abstract +

Mandibular propulsive appliance (MPA) stimulates cell proliferation and gene expression on mandible condylar cartilage (Marques et al., 2008). However, its association with low level laser therapy (LLLT) is unknown. This study evaluated the effects of LLLT associated to MPA on mandibular condyle. Twenty Wistar rats were divided into four groups. Group I received any treatment. Group II was bilaterally irradiated on temporomandibular joint with 10 J/cm² low level laser (780nm, 40mW and 10s) on alternate days. Group III used the propulsive appliance for ten hours daily and Group IV used the appliance daily and was irradiated on alternate days. After 15 days the animals were killed by lethal doses of anesthetics. The condyles were fixed in Methacarn solution and decalcified in 4.13% EDTA solution for 30 days. Seriate saggital 5 μm-thick sections were stained by the hematoxilin-eosin method. Morphological and morphometric analyses were performed to measure the length and the height of the mandibular condyle, the thickness of the condilar cartilage and the bone mass. Results were expressed as mean ± standard deviation (one-way ANOVA, Tukey's post-test.) The appliance increased all measures compared to the control group, except bone mass. Alone, LLLT had no effects on all measures, however, the association of the appliance with the LLLT increased condylar cartilage and bone mass significantly compared to the others groups. These results suggest that LLLT improves the effects of mandibular propulsive appliance in the condylar cartilage growth and formation of bone mass.

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