Alveolar bone changes caused by low level laser therapy during induced orthodontic movement on rats. / Alterações teciduais decorrentes da fotobiomodulação laser no movimento dentário induzido em ratos.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The use of laser phototherapy is considered an enhancement factor for bone repair as it stimulates microcirculation as well as the cellular metabolism. Regarding this, the purpose of this research was to assess histologic changes after the use of laser phototerapy during induced mesial tooth movement with 40g/F of the upper left first molars of young adult male Rattus norvegicus weighing 250 to 300g. Thirty animals were equally divided into three groups (n=10), named according to the time of animal death, i.e. seven, 13 and 19 days (G7, G13 e G19). Half of the animals in each group were submitted to irradiation with infrared laser (l790nm, 40mW, 20J/cm2 per session, every 48 hours, Ø~2mm), during orthodontic movement, the other half was used as controls. After animal death, specimens were sectioned, processed and stained with HE and Sirius red and were used for semi-quantitative histologic analysis with optical microscopy. Data was compared by inter and intra-group analysis using Kruskal Wallis and Fischer tests, and results were considered significant for p ≤ 0.05. Results demonstrated that Laser Phototherapy positively affected some important aspects of dental movement, such as decreased vascular density and inflammation, increased amount of osteoclasts and collagen and also modulated dental resorption and hyalinization. These results indicate that the use of laser phototherapy may create a more favorable condition for bone turnover in the periodontal ligament of Rattus norvegicus during orthodontic tooth movement.

ASSUNTO(S)

bone remodeling tooth movement remodelação óssea movimento ortodôntico odontologia histologia laser laser histology

ACESSO AO ARTIGO

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