Leaf Expander Versus Hyrax Expander in Mixed Dentition Patients With Posterior Crossbite.

Recruiting now · Not applicable

Conditions studied: Posterior Crossbite, Maxilla; Hypoplasia

In brief

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.

Key facts

Study ID

NCT07301918

Run by

Cairo University

People needed

30

Starts

2025-10-01

Expected to finish

2027-03-01

Last updated by the study team

2026-06-04

Who can join

Age: 6 and older, up to 12. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• 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.

You may not qualify if…

• Previous orthodontic treatment.
• Missing teeth.
• Inadequate oral hygiene.
• Patients with bad oral habits.
• Patients with medical conditions.
• Patients with cleft lip and palate.

Where it is running

• Cairo University — Cairo, Egypt (enrolling)

Full record on ClinicalTrials.gov

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