The effect of laser on the stimulation of bone-implant interaction: an experimental study in rabbits

Kleber Ricardo Monteiro Meyer, Marco Antonio Rambo Osório, Sabrina Rebollo Zani, Eduardo Rolim Teixeira


Purpose: To assess osseointegration by measuring the removal torque of smooth cylindrical implants placed in rabbit tibiae, having been subjected, or not, to low-intensity laser irradiation (GaAlAs).
Methods: Two implants were inserted into one shinbone of 16 male New Zealand rabbits weighing 3.5 – 4.0 kg; the animals were divided into four groups (control and laser at 16 and 30 days of wound healing). In the irradiated groups, laser was applied at a 830-nm wavelength, in continuous mode and with 100 mW of potency, and the applications were punctual, with 1 J/cm3 on three points, and were repeated eight times at 48-hour intervals starting immediately after implantation surgery, thus totaling 24 J/cm2. After the wounds healed, the animals were sacrificed, the tibiae were removed, implant removal torques were measured by means of a handheld digital torque-meter, and a factorial variance analysis statistical test was applied.
Results: There was significant intergroup difference regarding time as a single factor. The removal torque observed in the control groups was, for smooth implants, 20.42 ±3.06 N/cm at 16 days and 27.42 ±19.65 N/cm at 30 days; in the irradiated groups, the removal torque for smooth implants was 19.15±4.65 N/cm at 16 days and 30.08±4.14 N/cm at 30 days.
Conclusion: Removal torque values were higher at 30 days than at 16 days, independent of laser application.


Laser; implants; osseointegration; removal torque

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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