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A Mouse Distraction Osteogenesis Model
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Systemic melatonin application increases bone formation in mandibular distraction osteogenesis.

Izzet Acikan1, Gul Mehmet2, Gokhan Artas3

  • 1Sutcu Imam University, Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Kahramanmaras, Turkey.

Brazilian Oral Research
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PubMed
Summary

Systemic melatonin administration enhanced new bone formation in mandibular distraction osteogenesis (DO) in rats. Higher melatonin doses correlated with increased bone regeneration and elevated osteogenic markers.

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Area of Science:

  • Regenerative Medicine
  • Oral and Maxillofacial Surgery
  • Endocrinology

Background:

  • Distraction osteogenesis (DO) is a surgical technique used to lengthen bone segments.
  • Optimizing new bone formation during DO is crucial for successful outcomes.
  • Melatonin, a hormone with known bone-modulating properties, has not been extensively studied in the context of DO.

Purpose of the Study:

  • To evaluate the impact of varying systemic melatonin doses on new bone formation during mandibular DO in a rat model.
  • To investigate the effects of melatonin on key cellular and molecular markers associated with bone regeneration.

Main Methods:

  • Mandibular DO was performed on 30 female Sprague-Dawley rats, divided into control, low-dose melatonin, and high-dose melatonin groups.
  • Melatonin was administered systemically post-surgery over a 35-day period.
  • Histological, histomorphometric, and molecular analyses (osteoclast/osteoblast counts, OPN, VEGF levels) were conducted.

Main Results:

  • All groups showed complete bone fill in the distracted area.
  • Melatonin treatment significantly increased new bone formation, with the higher dose group showing the most pronounced effect.
  • Melatonin groups exhibited higher osteoclast and osteoblast numbers, as well as elevated osteopontin (OPN) and vascular endothelial growth factor (VEGF) levels compared to controls.

Conclusions:

  • Systemic melatonin application, particularly at higher doses, promotes new bone formation during mandibular distraction osteogenesis in rats.
  • Melatonin may enhance DO by modulating osteoclast and osteoblast activity and upregulating key growth factors like OPN and VEGF.
  • These findings suggest a potential therapeutic role for melatonin in improving bone regeneration in DO procedures.