Objective: The aim of the study was to compare the nasal cavity width changes following slow and rapid activation of miniscrew-supported maxillary expander. Materials and Methods: Twenty-four adolescent patients having transverse maxillary deficiency were included in the study. All the patients received a maxillary expander supported on four palatal miniscrews. The patients were equally randomized into two groups: Group I (slow expansion, once every other day), Group II (rapid expansion, twice per day). Cone beam computed tomography (CBCT) scans were made before expansion (T1) and at the end on the retention period after removing the expanders (T2). Measurements were performed on coronal cuts of the CBCT. Statistical analysis was performed. Results: Both activation rates resulted in a significant increase of the nasal cavity width. No significant difference was found between the two groups. Conclusion: Both slow and rapid activation protocols of miniscrew-supported maxillary expanders are effective in increasing the nasal cavity width.
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