The influence of low-level laser on orthodontic relapse in rats

摘要: Summary Objectives: This study evaluated the effect of low-level laser therapy (LLLT) on tendency rat molars to relapse following orthodontic tooth movement (OTM). Material and methods: Maxillary were moved mesially for 10 days. Animals randomly assigned group I (non-irradiated) or II (irradiation with LLLT). Appliances removed, allowed 1, 3, 5, 7, 14, 21 days; rats in received LLLT according a protocol. Bone density periapical alveolar bone was measured using radiographs Digora software. Dental supporting structures examined histologically haematoxylin eosin tartrate-resistant acid phosphatase. Results: In both groups, first molar rapid 1 day after end active treatment; by 21 days percentage as 86.11 per cent I, 72.22 II. Osteoclast number highest at OTM, thereafter successively decreased during phase groups. Decrease number, redistribution osteoclasts occurred more rapidly non-irradiated than group. Whilst generally less osteoclast numbers higher compared differences not significant. There no significant difference between two Conclusions: These results indicate that may reduce tendency, possibly due part formation previous tension areas, removal force. The role prevention requires further study.