Mandibular lengthening by external distraction: an experimental study in the rabbit

Area of Science:

• Orthopedic surgery
• Regenerative medicine
• Biomaterials

Background:

• Mandibular lengthening is crucial for treating congenital and acquired deformities.
• External distraction osteogenesis offers a method for bone elongation.

Purpose of the Study:

• To investigate bone development during mandibular lengthening via external distraction.
• To evaluate the Ilizarov transosseous osteosynthesis technique in mandibular lengthening.

Main Methods:

• Fifteen rabbits underwent mandibular corticotomy followed by 1 mm/day distraction for 2 weeks.
• Radiography, scintigraphy, and histology were used to assess bone formation.
• Samples were analyzed at various time points during and after distraction.

Main Results:

• Up to 11 mm of mandibular elongation was achieved.
• Radiographic and scintigraphic data indicated ossification by day 14.
• Histology revealed a progression from fibrous to osseous-like tissue at the distraction site.

Conclusions:

• Mandibular lengthening using external distraction is feasible.
• The Ilizarov technique facilitates new bone tissue formation for mandibular elongation.
• Further research is needed to optimize this technique for clinical application.