Related Experiment Video
Updated: Jul 1, 2026
Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
Assessment of Dentoskeletal and Airway Changes Using Hyrax and Fan-Type Expanders in Cleft Patients: An In Vivo CBCT
Singavarapu Hepsi Haritha1, Kanuru Ravi Krishna1, Sri Harsha Yelchuru1
1Department of Orthodontics and Dentofacial Orthopaedics, Drs. Sudha and Nageswara Rao Siddhartha Institute of Dental Sciences, Chinaoutpalli, Gannavaram, Andhra Pradesh, India.
None:
ObjectiveTo compare dentoskeletal, nasal septal, and upper airway changes following rapid maxillary expansion (RME) using Hyrax and fan-type expanders in growing patients with cleft lip and palate (CLP) using cone-beam computed tomography (CBCT).DesignProspective comparative clinical study.SettingUniversity-based tertiary care dental institution.PatientsTwenty patients aged 9 to 15 years with repaired unilateral or bilateral CLP and transverse maxillary deficiency.InterventionsParticipants were treated with bonded Hyrax (n = 10) or fan-type expanders (n = 10) according to maxillary constriction pattern. CBCT scans were obtained before expansion (T0) and after a 3-month retention period (T1).Main Outcome MeasuresAnteroposterior, vertical, and transverse dentoskeletal parameters, nasal septum deviation, and oropharyngeal airway volume were evaluated. Intragroup comparisons used the Wilcoxon signed-rank test; intergroup comparisons used the Mann-Whitney U test (P < .05).ResultsBoth appliances achieved significant transverse expansion. The fan-type expander showed greater anterior basal widening, whereas the Hyrax demonstrated greater posterior expansion and nasal cavity width increase. Airway volume increased but was not statistically significant.ConclusionsBoth expanders effectively correct transverse maxillary deficiency in CLP patients. Appliance selection should be based on constriction pattern. Airway effects appear limited.
