NCT07500194

Quad Helix vs RME for Posterior Cross-bite in Egyptian Children

Quad Helix Versus Rapid Maxillary Expanders in the Treatment of Posterior Cross-bite During Mixed Dentition in a Sample of Egyptian Children: A Randomized Clinical Study.

• Status: Not Yet Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 20 (estimated)
• Sponsor: Al-Azhar University · Academic / Other
• Sex: All
• Age: 9 Years – 12 Years
• Healthy volunteers: Not accepted

Summary

This randomized clinical trial aims to evaluate and compare the effectiveness of the Quad Helix (QH) appliance versus Rapid Maxillary Expanders (RME) in treating posterior cross-bite in Egyptian children during the mixed dentition stage. The study will also assess patient comfort and pain levels associated with each appliance.

Detailed description

The study involves 20 orthodontic patients aged 9-12 years with posterior cross-bite. Group A will receive the Quad Helix appliance, while Group B will receive Rapid Maxillary Expanders. Evaluation will be based on orthodontic study models, clinical photographs, and various radiographs including CBCT. Treatment will continue until complete correction is achieved, followed by a 3-month passive retention period.

Conditions

• Posterior Crossbite
• Maxillary Expansion
• Transverse Maxillary Deficiency

Interventions

Type	Name	Description
DEVICE	Quad Helix(QH) Appliance	It is a fixed orthodontic appliance fabricated using stainless-steel wire and soldered to bands on upper first permanent molars.
DEVICE	Rapid Maxillary Expanders	It is a fixed expansion device bonded on the upper first permanent molars and pre-molars. Activation is done at a rate of 0.25 mm twice daily (two turns per day)

Timeline

• Start date: 2026-03-30
• Primary completion: 2027-12-30
• Completion: 2028-03-31
• First posted: 2026-03-30
• Last updated: 2026-03-30

Locations

1 site across 1 country: Egypt