Quad Helix(QH) Appliance: It is a fixed orthodontic appliance fabricated using stainless-steel wire and soldered to bands on upper first permanent molars.
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)
Study 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.
Eligibility
Sex
ALL
Min age
9 Years
Max age
12 Years
Healthy volunteers
No
Inclusion Criteria:
1. Children aged 9-12 years in the mixed dentition stage
2. Presence of posterior cross-bite due to transverse maxillary deficiency
3. No previous history of orthodontic treatment
4. Good oral hygiene and cooperative behavior
5. No significant antero-posterior or vertical skeletal discrepancies
Exclusion Criteria:
1. Patient with craniofacial anomalies
2. Presence of systemic diseases or syndromes affecting bone metabolism
3. Extensive dental caries or untreated periodontal disease
4. History of trauma or surgery affecting the maxilla or mandible
Primary outcome measure(s)
Maxillary Arch Width Changes — Baseline and 6 months Measured on dental castes at the level of inter molar / inter canine width and Cone-beam computed tomography (CBCT) for upper arch
Trial sites (1)
Facility
City
Region
Status
Faculty of Dental medicine (boys) ,Cairo,Al-Azhar University
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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