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Does hyrax expansion therapy affect maxillary sinus volume? A cone-beam computed tomography report
Drew M Darsey1, Jeryl D English, Chung H Kau
1Department of Orthodontics, School of Dentistry, University of Texas Health Science Center at Houston, Houston, USA.
Imaging Science in Dentistry
|July 12, 2012
Summary
Maxillary expansion using the Hyrax appliance widened the palate but did not significantly alter maxillary sinus volume. This orthodontic treatment primarily affects transverse dimensions without impacting sinus capacity.
Area of Science:
- Orthodontics
- Craniofacial Anatomy
- Radiology
Background:
- Maxillary expansion is a common orthodontic procedure.
- Understanding its effects on adjacent structures like the maxillary sinus is crucial.
Purpose of the Study:
- To assess the immediate effects of Hyrax appliance-assisted maxillary expansion.
- To evaluate changes in maxillary sinus volume post-expansion.
Main Methods:
- 30 patients underwent maxillary expansion with a Hyrax appliance.
- Cone-beam computed tomography (CBCT) scans were taken before and after treatment.
- Linear dimensions, palatal vault angle, and maxillary sinus volumes were measured.
Main Results:
- Significant widening of the palatal vault and increased nasal cavity width were observed.
- Maxillary sinus volume remained largely unchanged.
- No significant vertical or anteroposterior movement of the hard palate occurred.
Conclusions:
- Hyrax appliance therapy effectively expands the maxilla transversely.
- This treatment does not significantly impact maxillary sinus volume.
