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Related Experiment Videos

Planning mandibular distraction: preliminary report

H W Losken1, G T Patterson, S A Lazarou

  • 1Division of Plastic and Reconstructive Surgery, University of Pittsburgh, PA, USA.

The Cleft Palate-Craniofacial Journal : Official Publication of the American Cleft Palate-Craniofacial Association
|January 1, 1995
PubMed
Summary
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This study presents normal mandibular measurements for assessing deficiency before distraction osteogenesis. Correct pin placement, guided by a specific formula, corrects mandibular deformities and normalizes the mandibular angle.

Area of Science:

  • Orthognathic surgery
  • Craniofacial development
  • Biomechanical engineering

Background:

  • Mandibular hypoplasia necessitates surgical correction, often via distraction osteogenesis.
  • Accurate assessment of mandibular skeletal deficiency is crucial for successful surgical outcomes.
  • Standardized measurements of mandibular components are essential for pre-surgical planning.

Observation:

  • Normal lengths of the vertical ramus, body, and angle of the mandible are detailed across various age groups.
  • Mandibular deficiency is quantified using cephalometric radiographs or 3D CT scans.
  • A formula is derived to calculate optimal pin placement angle for distraction osteogenesis.

Findings:

  • The formula calculates pin placement based on the mandibular angle and degrees of vertical ramus and total mandibular deficiency.

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  • Precise pin placement ensures correction of both vertical ramus and body length deficiencies.
  • This technique effectively addresses an obtuse mandibular angle, making it more acute.

    • Implications:

    • Provides a quantitative method for pre-operative planning in mandibular distraction.
    • Aims to improve surgical outcomes and functional aesthetics in patients with mandibular hypoplasia.
    • Contributes to the standardization of surgical techniques for treating craniofacial abnormalities.