Comparing two appliances for treating posterior cross-bite in children

A Comparative Evaluation of Modified Hyrax Versus Quad Helix in Treatment of Children With Posterior Cross Bite: Randomized Controlled Trial

Not applicable Interventional Cairo University · NCT06300775

This study is testing which of two dental appliances works better to fix cross-bite in kids and improve their chewing, sleep, and jaw pain over a year.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment10 (estimated)
Ages6 Years to 18 Years
SexAll
SponsorCairo University Academic / other
Locations1 site (Cairo)
Trial IDNCT06300775 on ClinicalTrials.gov

What this trial studies

This study evaluates the effectiveness of modified hyrax and Quad helix appliances in treating posterior cross-bite in children with mixed dentition. It aims to determine which appliance results in better outcomes related to chewing difficulties, as well as assessing changes in inter-maxillary width, sleep apnea, and symptoms of temporomandibular joint disorders over a one-year period. Children will be monitored at regular intervals to gather comprehensive data on their treatment progress.

Who should consider this trial

Good fit: Ideal candidates are children with posterior cross-bite in the mixed dentition stage and normal to mild growth patterns.

Not a fit: Patients with advanced periodontal diseases, general diseases, syndromes, previous orthodontic treatment, or severe horizontal growth patterns may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could improve treatment options for children with posterior cross-bite, enhancing their chewing ability and overall oral health.

How similar studies have performed: While similar studies have been conducted, this specific comparison of modified hyrax and Quad helix appliances is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Children with posterior cross-bite in mixed dentition stage.
* Children with normal and mild growth pattern.
* Children with completely erupted upper first molars.

Exclusion Criteria:

* Children with advanced periodontal diseases.
* Children having general diseases, syndromes.
* Children with previous orthodontic.
* Children with severe horizontal growth patterns.

Where this trial is running

Cairo

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Posterior Cross Bite
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.