Biomechanical effect of one session of low-level laser on the bone–titanium implant interface

• Published in: Lasers in medical science 2013-01, Vol.28 (1), p.349-352
• Main Authors: Boldrini, Carolina, de Almeida, Juliano Milanezi, Fernandes, Leandro Araújo, Ribeiro, Fernando Salimon, Garcia, Valdir Gouveia, Theodoro, Letícia Helena, Pontes, Ana Emília Farias
• Format: Article
• Language: English
• Subjects: Analysis of Variance; Animals; Biomechanical Phenomena; Biomechanics; Dental Implantation, Endosseous - methods; Dental Implants; Dental research; Dentistry; Lasers; Low-Level Light Therapy - methods; Medicine; Medicine & Public Health; Models, Animal; Optical Devices; Optics; Original Article; Osseointegration - radiation effects; Osteogenesis - radiation effects; Photonics; Quantum Optics; Rats; Rats, Wistar; Surgical Flaps; Tibia; Titanium; Torque; Transplants & implants; Wound Healing - radiation effects
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-012-1167-3

Low-level laser (LLL) has been used on peri-implant tissues for accelerating bone formation. However, the effect of one session of LLL in the strength of bone–implant interface during early healing process remains unclear. The present study aims to evaluate the removal torque of titanium implants irradiated with LLL during surgical preparation of implant bed, in comparison to non-irradiation. Sixty-four Wistar rats were used. Half of the animals were included in LLL group, while the other half remained as control. All animals had the tibia prepared with a 2 mm drill, and a titanium implant (2.2 × 4 mm) was inserted. Animals from LLL group were irradiated with laser (gallium aluminum arsenide), with a wavelength of 808 nm, a measured power output of 50 mW, to emit radiation in collimated beams (0.4 cm 2 ), for 1 min and 23 s, and an energy density of 11 J/cm 2 . Two applications (22 J/cm 2 ) were performed immediately after bed preparation for implant installation. Flaps were sutured, and animals from both groups were sacrificed 7, 15, 30, and 45 days after implant installation, when load necessary for removing implant from bone was evaluated by using a torquimeter. In both groups, torque values tended to increase overtime; and at 30 and 45 days periods, values were statistically higher for LLL group in comparison to control (ANOVA test, p