29 February 2016 Diode λ830nm laser associated with hydroxyapatite and biological membranes: bone repair in rats
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Proceedings Volume 9692, Lasers in Dentistry XXII; 96920L (2016) https://doi.org/10.1117/12.2211955
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
The aim of the present study was to histologically assess the effect of laser therapy (AsGaAl, 830nm, 40mW, CW, φ ~0,6mm, 16J/cm2 per session, four points of 4J/cm2) on the repair of surgical defects created in the femur of Wistar rats. Background data: Several techniques have been proposed for the correction of bone defects, including the use of grafts and membranes. Despite the increase in the use of laser therapy for the biomodulation of bone repair, very few studies have assessed the associations between laser light and biomaterials. Method: The defects were filled with synthetic micro granular hydroxyapatite (HA) Gen-phos® implants and associated with bovine bone membranes (Gen-derm®). Surgical bone defects were created in 48 rats and divided into four groups: Group IA (control, n=12); Group IB (laser, n=12); Group IIA (HA + membrane, n=12); Group IIB (HA + membrane + laser, n=12). The irradiated groups received the first irradiation immediately after surgery. This radiation was then repeated seven times every 48h. The animals were sacrificed after 15, 21, and 30 days. Results: When comparing the groups irradiated with implants and membranes, it was found that the repair of the defects submitted to laser therapy occurred more quickly, starting 15 and 21 days after surgery. By the 30th day, the level of repair of the defects was similar in the irradiated and the non-irradiated groups. New bone formation was confirmed inside the cavity by the implant’s osteoconduction. In the irradiated groups, there was an increment of this new bone formation. Conclusions: In conclusion, the use of laser therapy, particularly when associated with hydroxyapatite and biological membranes, produced a positive biomodulation effect on the healing process of bone defects on the femurs of rats.
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Vanda Sanderana Macêdo Carneiro, Vanda Sanderana Macêdo Carneiro, Francisco de Assis Limeira, Francisco de Assis Limeira, Marleny Elizabeth Martinez Gerbi, Marleny Elizabeth Martinez Gerbi, Rebeca Ferraz de Menezes, Rebeca Ferraz de Menezes, Alexandrino Pereira dos Santos-Neto, Alexandrino Pereira dos Santos-Neto, Natália Costa Araújo, Natália Costa Araújo, } "Diode λ830nm laser associated with hydroxyapatite and biological membranes: bone repair in rats", Proc. SPIE 9692, Lasers in Dentistry XXII, 96920L (29 February 2016); doi: 10.1117/12.2211955; https://doi.org/10.1117/12.2211955
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