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Immediate changes in condylar position after rapid maxillary expansion.
Camilo Aquino Melgaço1, José Columbano Neto1, Estela Maris Jurach1
1Postgraduate student, Department of Orthodontics, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Summary
Rapid maxillary expansion causes immediate anterior and inferior displacement of condyles in Class I malocclusion patients. Lateral inclination of the condyles was also observed, rejecting the null hypothesis.
Area of Science:
- Orthodontics
- Craniofacial development
- Biomechanical analysis
Background:
- Dentoalveolar and skeletal effects of rapid maxillary expansion (RME) are established.
- Condylar response to RME remains poorly understood.
- Investigating immediate condylar position changes is crucial for understanding RME's full impact.
Purpose of the Study:
- To test the hypothesis that RME causes immediate changes in condyle position.
- To evaluate immediate condylar displacement and inclination following RME in Class I malocclusion.
Main Methods:
- Thirty-four Class I malocclusion patients underwent RME.
- Cone-beam computed tomography (CBCT) scans were taken before RME and after 3 weeks.
- Software was used to standardize head positioning and analyze condylar landmarks.
Main Results:
- No significant asymmetries in condylar positions were detected.
- Statistically significant average anterior displacement of 0.52 mm and inferior displacement of 0.49 mm occurred.
- Lateral inclinations of condyles were observed and confirmed by coronal angles.
Conclusions:
- The null hypothesis was rejected, indicating RME does induce immediate condylar changes.
- Significant anterior and inferior condylar displacements are immediate effects of RME.
- Lateral condylar inclination is a notable response to RME.
