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Published on: October 27, 2023
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Maxillary cortical bone remodeling characteristics in extraction patients: A cone-beam computed tomography study
Shuo Wang1, Dawei Liu1, Runzhi Guo1
1Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China.
Summary
Maxillary incisor retraction results in less bone remodeling than tooth movement. Bodily retraction may decrease bone remodeling ratios, and root penetration is needed for palatal bone remodeling.
Area of Science:
- Orthodontics
- Dental Imaging
- Bone Biology
Background:
- Cortical bone remodeling (BR) during maxillary incisor retraction is debated.
- Understanding labial and palatal BR characteristics is crucial for orthodontic treatment planning.
Purpose of the Study:
- To evaluate labial and palatal cortical bone remodeling (BR) characteristics after maxillary incisor retraction.
- To analyze factors influencing BR and tooth movement ratios.
Main Methods:
- Cone-beam computed tomography (CBCT) images of 44 patients were analyzed.
- Labial bone remodeling to tooth movement (BT) ratios were calculated at different root levels.
- Multivariate linear regression and statistical tests were used to assess relationships and group differences.
Main Results:
- Mean labial BT ratios were below 1.00, indicating less bone remodeling than tooth movement.
- BT ratios were significantly lower at the apical (S3) level compared to crestal and midroot (S2) levels.
- Tooth movement patterns negatively correlated with BT ratios at S2 and S3 levels.
Conclusions:
- Maxillary incisor retraction results in less cortical bone remodeling than tooth movement.
- Bodily retraction may be associated with lower labial BT ratios at apical and midroot levels.
- Palatal cortical bone remodeling initiation requires root penetration of the original palatal border.
