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Force level and strain patterns during bilateral mandibular osteodistraction.

J B Cope1, J Yamashita, S Healy

  • 1TAMUS-Baylor College of Dentistry, Department of Orthodontics, Dallas, TX 75266-0677, USA. jasoncope@orthodontist.net

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|February 12, 2000
PubMed
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Device orientation significantly impacts mandibular distraction osteogenesis. Orienting devices parallel to the mandibular body increases lateral forces and bone strain, unlike parallel alignment to the distraction axis.

Area of Science:

  • Biomechanical Engineering
  • Craniofacial Surgery
  • Orthodontics

Background:

  • Device orientation is crucial in mandibular distraction osteogenesis.
  • Understanding biomechanical forces is essential for optimizing surgical outcomes.

Purpose of the Study:

  • To evaluate force levels and strain patterns during mandibular distraction.
  • To compare biomechanical effects of device orientation parallel to the mandibular body versus the sagittal axis of distraction.

Main Methods:

  • Utilized five human cadaver mandibles in a custom apparatus.
  • Measured lateral force and bone strain using transducers and strain gauges at 5 and 10 mm distraction.
  • Compared device orientation parallel to the mandibular body versus parallel to the distraction axis.

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Main Results:

  • Significantly greater lateral forces were observed with devices oriented parallel to the mandibular body.
  • This orientation resulted in increased tensile strains (labial symphysis, medial ramus) and compressive strains (lingual symphysis, lateral ramus).
  • No significant forces or strains were detected when devices were oriented parallel to the distraction axis.

Conclusions:

  • Device orientation critically influences biomechanical forces and strain distribution during mandibular osteodistraction.
  • Findings suggest specific device alignment may optimize treatment outcomes and minimize adverse effects.