Segmental mandibular reconstruction by microincremental automatic distraction osteogenesis: an animal study.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Surgical Innovation

Background:

• Critical size mandibular defects pose significant reconstructive challenges.
• Existing methods for mandibular reconstruction have limitations.
• Distraction osteogenesis is a promising technique for bone regeneration.

Purpose of the Study:

• To evaluate the efficacy of a novel automatic distraction device for mandibular defect reconstruction in a sheep model.
• To assess the new bone formation and bone quality following distraction osteogenesis.

Main Methods:

• A critical size mandibular defect was surgically created in six sheep.
• A newly developed automatic distraction device with implantable and external components was utilized.
• Bone transport distraction was performed at a rate of 1 mm/24 h.
• Radiographic analysis was used to assess bone formation and radiodensity.

Main Results:

• The automatic distraction device facilitated successful bone transport across the mandibular defect.
• New bone regeneration was observed on both the compression (anterior) and tension (posterior) sides of the transport disc.
• The newly formed bone exhibited similar radiodensity to the adjacent native mandibular bone eight weeks post-distraction.

Conclusions:

• The novel automatic distraction device is effective in reconstructing critical size mandibular defects.
• Distraction osteogenesis using this device promotes robust new bone formation with comparable density to native bone.
• This technology holds potential for advancing surgical reconstruction of mandibular defects.