بررسي اثر دو نوع ليزر كم توان OBTODAN( و )KLO3 برميزان حركت ارتودنسي دندان در خرگوش

Effects of two types of low level lasers (KLO3 and Optodan) on the orthodontic tooth movements in rabbits

Background and Aim: The effects of low level lasers on bone cellular activity, bone structure, bone healing, fibroblasts activity and inflammation process have been already investigated. Considering that orthodontic tooth movement is a complicated inflammatory process involving simultaneous bone apposition and resorption; the aim of this controlled study was to investigate the quantitative effects of a pulsed laser (Optodan) and a continuous laser (KLO3) on the orthodontic tooth movement in rabbits. Materials and Methods: This experimental study was conducted on 18 male albino rabbits divided into three equal groups of control, Optodan and KLO3. The first mandibular molars, in all groups, were under a four - ounce tension using NiTi-Closed coil springs. The control group was not irradiated but the laser groups were irradiated for nine days according to the periodontal therapeutic protocols. After sixteen days, following the termination of therapeutic regime; samples were sacrificed. The distance between distal surface of the first molar and the mesial surface of the second molar was measured with 0.05 mm accuracy. Data were subjected to the statistical tests of Kolmogrov Smirnov and Variance analysis. Results: The mean orthodontic tooth movements of the first mandibular molars were I.7±0.16 mm in control group, 0.69±0.16 mm in Optodan group and 0.86±0.13 mm in KLO3 group. There were statistically significant difference, in orthodontic tooth movements, between the control and two other laser - irradiated groups (P<0.001). Conclusion: The findings of the present study imply that the amount of orthodontic tooth movement, following low level laser therapy, diminishes. Theoretically, the inhibitory effects of lasers on prostaglandins as a mediator in cellular response for tooth movement can be a justification for the mentioned biologic behaviour.