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Anatomical limitations and factors influencing molar distalization
The Angle Orthodontist
|May 23, 2022
Summary
Cone-beam computed tomography (CBCT) revealed anatomical limits for molar distalization. Hyperdivergent growth patterns in Class II and Class III patients indicate reduced potential for effective molar movement.
Area of Science:
- Orthodontics
- Dental Anatomy
- Radiology
Background:
- Molar distalization is a key orthodontic procedure.
- Understanding anatomical limitations is crucial for successful treatment planning.
- Cone-beam computed tomography (CBCT) offers detailed 3D imaging.
Purpose of the Study:
- To analyze anatomical limitations in maxillary and mandibular retromolar regions impacting molar distalization.
- To assess the influence of skeletal classes and vertical growth patterns on available space for distalization.
Main Methods:
- CBCT scans of 120 patients (Class II and Class III) were analyzed.
- Available distance for distalization and cortical bone thickness were measured.
- Data were stratified by vertical growth pattern, age, sex, and third molar presence.
Main Results:
- Class II maxilla showed minimum distance at 3mm from CEJ (avg. 4.06mm, CBT 1.00mm).
- Class III mandible showed minimum distance at 9mm from CEJ (avg. 2.80mm, CBT 2.24mm).
- Hyperdivergent groups exhibited the least available distance for molar distalization in both classes.
Conclusions:
- Maxillary limits for distalization are closer to the coronal level in Class II, while mandibular limits are closer to the apical level in Class III.
- Hyperdivergent growth patterns significantly reduce the potential for molar distalization.
- CBCT axial slices are valuable for evaluating molar distalization limits.
