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Related Experiment Videos

Proximal segment position after distraction with the MD-DOS device.

K Hendrickx1, M Y Mommaerts, W Jacobs

  • 1Division of Maxillo-Facial Surgery, General Hospital St John, Bruges, Belgium.

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|June 28, 2000
PubMed
Summary

Mandibular lengthening using the MD-DOS device caused anterior rotation of the proximal segment and posterior rotation of the distal segment. This resulted in jaw angle advancement, similar to traditional osteotomies.

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Area of Science:

  • Orthodontics
  • Craniofacial Surgery
  • Biomechanical Engineering

Background:

  • Mandibular lengthening is crucial for treating severe retrognathia.
  • Distraction osteogenesis offers an alternative to conventional osteotomies.
  • Understanding segment movement is key to optimizing outcomes.

Purpose of the Study:

  • To cephalometrically analyze proximal segment rotation during mandibular lengthening with the MD-DOS device.
  • To compare segment movement with traditional mandibular advancement techniques.

Main Methods:

  • Cephalometric analysis of patients undergoing mandibular lengthening.
  • Measurement of proximal and distal segment rotation in the sagittal plane.
  • Utilized the MD-DOS distraction device with a single posterior screw anchorage.

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Main Results:

  • The proximal segment exhibited an average anterior rotation of 3.3 degrees.
  • The distal segment showed posterior rotation post-lengthening.
  • The jaw angle advanced approximately half the distance of the distal segment advancement.
  • Observed positional movements were comparable to those after bilateral sagittal split osteotomies.

Conclusions:

  • The MD-DOS device induces predictable segment rotation during mandibular lengthening.
  • Masticatory muscle pull and elastic forces may contribute to proximal segment rotation.
  • The observed movements are similar to conventional mandibular advancement, suggesting comparable biomechanical effects.