the effect of low level laser on condylar growth during mandibular advancement in rabbits低水平的影响激光在兔子在下颌髁的成长进步.pdfVIP

Abtahi et al. Head Face Medicine 2012, 8:4 /content/8/1/4 HEAD FACE MEDICINE RESEARCH Open Access The effect of low level laser on condylar growth during mandibular advancement in rabbits 1 2* 3 1 1 Mostafa Abtahi , Maryam Poosti , Nasrollah Saghravanian , Kamran Sadeghi and Hooman Shafaee Abstract Introduction: It has been shown that Low Level Laser (LLL) has a positive effect on bone formation. The aim of this study was to evaluate the effect of low level laser on condylar growth during mandibular advancement in rabbits. Materials and methods: Continuous forward mandibular advancement was performed in fourteen male Albino rabbits with the mean age of 8 weeks and the mean weight of 1.5 ± 0.5 kg, with acrylic inclined planes. The rabbits were randomly assigned into two groups after 4 weeks. LLL (KLO3: wave length 630 nm) was irradiated at 3 points around the TMJ, through the skin in the first group. The exposure was performed for 3 minutes at each point (a total of 9 minutes) once a day for 3 weeks. The control group was not exposed to any irradiation. The rabbits in both groups were sacrificed after two months and the histological evaluation of TMJ was performed to compare fibrous tissue, cartilage, and new bone formation in condylar region in both groups. Disc displacement was also detected in both groups. Student’s t-test, Exact Fisher and Chi square tests were used for the statistical analysis. Results: The formation of fibrous tissue was significantly lower, while bone formation was significantly greater in lased group as compared with control group. The t