Tooth movement into distraction regenerate: when should we start?

Area of Science:

• Orthodontics
• Regenerative Medicine
• Oral and Maxillofacial Surgery

Background:

• Mandibular distraction osteogenesis (MDO) is a surgical procedure to increase mandibular length.
• Orthodontic tooth movement into regenerated bone following MDO requires careful timing.
• Understanding the optimal window for initiating orthodontic treatment post-MDO is crucial for successful outcomes.

Purpose of the Study:

• To clinically, radiographically, and histologically evaluate orthodontic tooth movement into bone regenerate after MDO.
• To determine the optimal timing for initiating orthodontic tooth movement following MDO.

Main Methods:

• Nine mongrel dogs underwent MDO to create an average 9 mm edentulous gap.
• Dogs were divided into three groups, initiating tooth movement at 1, 3, or 6 weeks post-consolidation.
• Evaluated were the rate and type of tooth movement and adverse tissue reactions (root resorption, crestal bone loss).

Main Results:

• Early orthodontic tooth movement into regenerate bone resulted in analogous adverse tissue reactions.
• Radiographic and histologic analyses confirmed increased root resorption and crestal bone loss with early movement.
• The rate and type of tooth movement varied significantly across the three consolidation timing groups.

Conclusions:

• Early initiation of orthodontic tooth movement into distraction regenerate is not recommended due to potential adverse tissue reactions.
• Radiographic examination of the distraction regenerate is advised as a guide to determine the appropriate timing for initiating tooth movement.
• Careful timing and radiographic assessment are essential for safe and effective orthodontic treatment following MDO.