Bone response to buccal tooth movements-with and without flapless alveolar decortication

Area of Science:

• Orthodontics
• Periodontology
• Biomaterials Science

Background:

• Alveolar bone remodeling is crucial for orthodontic tooth movement.
• Flapless alveolar decortication is a minimally invasive technique to accelerate tooth movement.
• Understanding the biological response to combined decortication and orthodontic forces is essential.

Purpose of the Study:

• To evaluate the biological response of alveolar bone to flapless alveolar decortication and buccal forces.
• To assess tooth movement, bone quantity, quality, and formation after the procedure.

Main Methods:

• Randomized split-mouth design in six beagle dogs.
• Unilateral piezosurgical flapless alveolar decortication versus sham surgery.
• Buccal tooth movement with archwires for 9 weeks, followed by 2 weeks of consolidation.
• Evaluation using intraoral measurements, radiography, micro-CT, and histology.

Main Results:

• Experimental teeth showed significantly greater expansion and tipping (P < 0.05).
• Peak tooth movement occurred around 5 weeks.
• Micro-CT revealed less mature bone apico-buccally and cervico-lingually; histology showed fenestrations.
• The experimental side exhibited increased new bone formation and modeling.

Conclusions:

• Archwire expansion alone reduced buccal bone height (BBH).
• Piezosurgical decortication combined with archwire expansion accelerated tooth movement and tipping.
• The combined approach led to less dense and less mature bone formation.