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Histomorphometric assessment of the influence of low-level laser therapy on peri-implant tissue healing in the rabbit mandible

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Histomorphometric assessment of the influence of low-level laser therapy on peri-implant tissue healing in the rabbit mandible

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Título Histomorphometric assessment of the influence of low-level laser therapy on peri-implant tissue healing in the rabbit mandible
Autor Massotti, Fabrício Poletto
Gomes, Fernando Vacilotto
Mayer, Luciano
Oliveira, Marilia Gerhardt de
Baraldi, Carlos Eduardo Espindola
Ponzoni, Deise
Puricelli, Edela
Abstract Objective: The purpose of this study was to demonstrate the effect of low-level laser therapy (LLLT) on the peri-implant bone healing process in the rabbit mandible. Background data: LLLT has been shown to accelerate tissue repair and osseointegration of implants placed into the rabbit tibia. However, the beneficial effects of LLLT have never been tested in the rabbit mandible, which would more closely mimic the human situation. Materials and methods: Twenty-four male New Zealand rabbits were randomly divided into four groups of six animals each. All animals had their left mandibular incisors extracted, followed by immediate insertion of a titanium dental implant in the fresh socket. Three groups received LLLT [aluminum-galliumarsenide (AlGaAs), λ=830nm, 50mW, continuous wave (CW)] at three different energy densities per treatment session (E-5, 5 J/cm²; E-10, 10 J/cm2; and E-20, 20 J/cm²). Irradiation was performed every 48 h for 13 days, totaling seven sessions. One group received sham treatment (controls). Histological sections were obtained from each of the 24 mandibles dissected, without first decalcifying the specimens, and were stained with hematoxylin and eosin and Picrosirius red for histomorphometric evaluation. Bone-to-implant contact (BIC), bone formation area, and collagen fiber area were assessed by light microscopy. Results: Significant differences were found between group E-20 and all other groups ( p < 0.05). Histomorphometric evaluation showed significantly higher BIC and significantly more collagen fibers in group E-20. Conclusions: Photobiostimulation with LLLT at an energy density of 20 J/cm2 per session had a significant positive effect on new bone formation around dental implants inserted in the rabbit mandible.
Contido em Photomedicine and laser surgery. Larchmont, NY. Vol. 33, no. 3 (Mar. 2015), p. 123-128
Assunto Cicatrização
Laser na odontologia
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/115886
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