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Related Experiment Videos

Vector control in lower jaw distraction osteogenesis using an extra-oral multidirectional device.

K Hurmerinta1, J Hukki

  • 1Cleft Palate and Craniofacial Centre, Helsinki University Central Hospital, Finland. Kirsti.Hurmerinta@hus.fi

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|October 25, 2001
PubMed
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This study shows that multidimensional distractors effectively reposition the lower jaw, increasing ramus height and improving overjet. Controlled distraction vectors prevent open bites and crossbites in patients with severe retrognathia.

Area of Science:

  • Orthodontics
  • Craniofacial Surgery
  • Cephalometric Analysis

Background:

  • Severe retrognathia presents significant challenges in lower jaw development.
  • Traditional distraction methods may have limitations in achieving optimal outcomes.

Purpose of the Study:

  • To describe facial and occlusal structural changes during mandibular distraction using a novel technique.
  • To evaluate the efficacy of multidimensional extra-oral distractors in correcting severe lower jaw deficiency.

Main Methods:

  • A cephalometric study involving seven patients (ages 7-16) with severe retrognathia.
  • Bilateral extra-oral distraction with a two-phase approach: initial horizontal, followed by vertical vector change using an adjustable hinge.
  • Analysis of cephalometric follow-up records to assess structural changes.

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Main Results:

  • Significant anterior repositioning of the mandible and increased ramus height were observed.
  • A more horizontal mandibular occlusal plane and a posterior open bite were noted.
  • Controlled distraction vectors successfully prevented anterior open bite and lateral crossbite.

Conclusions:

  • Extra-oral multidimensional distractors offer advantages for treating severe lower jaw deficiency.
  • Precise vector control during the active distraction phase is crucial for successful outcomes.