Methods: Sample consisted of two equal groups of eight male albino rabbits. An artificial socket was prepared by an implant drill (2.8x8 mm) in the mesial aspect of the first mandibular premolars. The artificial sockets were filled with freeze-dried bone substitutes (CenoBone®). First premolars were connected to incisors using NiTi closed coil springs. Experimental group received continuous laser irradiation (808 nm) in proximity of mesial root and bone graft (14 days, twice with two weeks interval) but Control group was not irradiated. Both groups were sacrificed after 48 days and orthodontic tooth movement was measured immediately. The specimens were underwent histological assessment and the data were subjected to Student t-test.
Results: As suggested by the results, the difference of orthodontic tooth movements between two groups was not significant. The mean root resorption were 1.61±0.43 mm2 and 0.18±0.07 mm2 in Control and Experimental groups respectively being significantly lower in the laser irradiated experimental group (p<0.001).
Conclusions: According to the present study, it seems that GaAlAs low level laser irradiation together with the application of freeze-dried allograft not only do not interfere with orthodontic tooth movement but also decreases root resorption significantly.