Low-Level Laser Therapy Enhances the Stability of Orthodontic Mini-Implants via Bone Formation Related to BMP-2 Expression in a Rat Model
- 1 May 2012
- journal article
- research article
- Published by Mary Ann Liebert Inc in Photomedicine and Laser Surgery
- Vol. 30 (5), 255-261
- https://doi.org/10.1089/pho.2011.3157
Abstract
Objective: The aim of this study was to investigate the stimulatory effects of low-level laser therapy (LLLT) on the stability of mini-implants in rat tibiae. Background data: In adolescent patients, loosening is a notable complication of mini-implants used to provide anchorage in orthodontic treatments. Previously, the stimulatory effects of LLLT on bone formation were reported; here, it was examined whether LLLT enhanced the stability of mini-implants via peri-implant bone formation. Materials and methods: Seventy-eight titanium mini-implants were placed into both tibiae of 6-week-old male rats. The mini-implants in the right tibia were subjected to LLLT of gallium-aluminium-arsenide laser (830 nm) once a day during 7 days, and the mini-implants in the left tibia served as nonirradiated controls. At 7 and 35 days after implantation, the stability of the mini-implants was investigated using the diagnostic tool (Periotest). New bone volume around the mini-implants was measured on days 3, 5, and 7 by in vivo microfocus CT. The gene expression of bone morphogenetic protein (BMP)-2 in bone around the mini-implants was also analyzed using real-time reverse-transcription polymerase chain reaction assays. The data were statistically analyzed using Student's t test. Results: Periotest values were significantly lower (0.79- to 0.65-fold) and the volume of newly formed bone was significantly higher (1.53-fold) in the LLLT group. LLLT also stimulated significant BMP-2 gene expression in peri-implant bone (1.92-fold). Conclusions: LLLT enhanced the stability of mini-implants placed in rat tibiae and accelerated peri-implant bone formation by increasing the gene expression of BMP-2 in surrounding cells.Keywords
This publication has 30 references indexed in Scilit:
- Effects of low‐level laser therapy after Corticision on tooth movement and paradental remodelingLasers in Surgery and Medicine, 2009
- Low-level laser therapy improves bone repair in rats treated with anti-inflammatory drugsJournal of Oral Rehabilitation, 2008
- Evaluation of orthodontic mini-implant anchorage in premolar extraction therapy in adolescentsAmerican Journal of Orthodontics and Dentofacial Orthopedics, 2008
- Application of orthodontic mini-implants in adolescentsInternational Journal of Oral & Maxillofacial Surgery, 2007
- Tapered orthodontic miniscrews induce bone-screw cohesion following immediate loadingEuropean Journal of Orthodontics, 2006
- Effect of low intensity laser irradiation on surgically created bony defects in ratsJournal of Oral Rehabilitation, 2006
- Recommended placement torque when tightening an orthodontic mini‐implantClinical Oral Implants Research, 2005
- Low power laser irradiation alters the rate of regeneration of the rat facial nerveLasers in Surgery and Medicine, 1993
- Power density and exposure time of He‐Ne laser irradiation are more important than total energy dose in photo‐biomodulation of human fibroblasts in vitroLasers in Surgery and Medicine, 1992
- The biomedical effects of laser applicationLasers in Surgery and Medicine, 1985