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Recovery bone formation over radiographic lingual bone dehiscence after mandibular molar distalization with
The Angle Orthodontist
|September 27, 2025
Summary
Mandibular molar distalization with microimplants significantly reduces lingual bone thickness. However, bone thickness recovers during retention, though it remains less than pretreatment levels.
Area of Science:
- Orthodontics
- Dental Implantology
- Periodontology
Background:
- Molar distalization is a common orthodontic procedure.
- Microimplants offer skeletal anchorage for efficient tooth movement.
- Assessing bone changes during and after distalization is crucial for long-term stability.
Purpose of the Study:
- To evaluate changes in mandibular lingual bone thickness after molar distalization using microimplants.
- To assess bone changes during the retention phase following distalization.
Main Methods:
- Cone-beam computed tomography (CBCT) scans of 21 patients were analyzed at pretreatment, posttreatment, and retention phases.
- Mandibular second molar movement and lingual bone thickness at various apical levels were measured.
- Statistical analyses included repeated measures ANOVA and Pearson's correlation.
Main Results:
- Molar distalization resulted in significant lingual bone thickness reduction, with some cases showing dehiscence at the 6-mm apical level.
- During retention, bone thickness increased significantly but remained less than initial pretreatment levels.
- Lingual bone thinning correlated with the extent of distal tooth movement.
Conclusions:
- Molar distalization with microimplants leads to a noticeable decrease in mandibular lingual bone thickness.
- Significant bone regeneration occurs during the retention period, particularly at sites with prior thinning or dehiscence.
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