Leaf Expander Versus Hyrax Expander in Mixed Dentition Patients With Posterior Crossbite.
Design: Two-arm parallel randomized clinical trial in mixed dentition (6-12 years). Arms: (1) 9 mm, 900 g leaf expander; (2) 9 mm Hyrax expander. Follow-up: From appliance insertion → completion of intended expansion → 6-month retention. Primary outcome: Pain perception during the first 7 days post-insertion (daily pat
| Condition(s) | Posterior Crossbite, Maxilla; Hypoplasia |
|---|---|
| Status | Recruiting |
| Phase | NA |
| Study type | Interventional |
| Summary | Design: Two-arm parallel randomized clinical trial in mixed dentition (6-12 years). Arms: (1) 9 mm, 900 g leaf expander; (2) 9 mm Hyrax expander. Follow-up: From appliance insertion → completion of intended expansion → 6-month retention. Primary outcome: Pain perception during the first 7 days post-insertion (daily patient-reported scale). Secondary outcomes: Skeletal and dental changes on CBCT. |
| Who can participate | Inclusion Criteria: * Male and female patients * Mixed dentition stage * Unilateral or bilateral posterior crossbite. * Patients in prepubertal stage with cervical vertebral maturation stage 1-3. * Fully erupted maxillary and mandibular permanent first molars. * Skeletal class I or II. Exclusion Criteria: * Previous orthodontic treatment. * Missing teeth. * Inadequate oral hygiene. * Patients with bad oral habits. * Patients with medical conditions. * Patients with cleft lip and palate. |
| Ages | 6 Years to 12 Years |
| Sex | All |
| Lead sponsor | Cairo University |
| Locations | Cairo, Egypt |
| Start date | 2025-10-01 |
| NCT ID | NCT07301918 |
| Official listing | https://clinicaltrials.gov/study/NCT07301918 |