Leaf Expander Versus Hyrax Expander in Mixed Dentition Patients With Posterior Crossbite.
NCT ID: NCT07301918
Last Updated: 2025-12-24
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.
NOT_YET_RECRUITING
NA
30 participants
INTERVENTIONAL
2025-12-31
2027-03-31
Brief Summary
Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.
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.
Detailed Description
Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.
Leaf expander arm: Nickel-titanium leaf-spring expander, 9 mm screw, delivering force of \~900 g.
Hyrax expander arm: Conventional tooth-borne jackscrew expander, 9 mm screw. Standard activation: two turns per week.
Retention: Both appliances kept passively in situ for 6 months of retention following achievement of planned expansion.
Conditions
See the medical conditions and disease areas that this research is targeting or investigating.
Keywords
Explore important study keywords that can help with search, categorization, and topic discovery.
Study Design
Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.
RANDOMIZED
PARALLEL
OTHER
SINGLE
Study Groups
Review each arm or cohort in the study, along with the interventions and objectives associated with them.
Banded Leaf expander supported on the maxillary first permanent molars
9mm leaf expander delievering 900 gm force will be supported on the upper first permanent molars with the appliance arm extending to the canines
The Leaf expander
The Leaf expander incorporates Nickel Titanium springs that will not require the patients' home activation
Banded Hyrax expander supported on the maxillary first permanent molars
9mm Hyrax expander will be supported on the upper first permanent molars with the appliance arm extending to the canines
Hyrax expander
Hyrax expander incorporates a screw that requires the patients' home activation
Interventions
Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.
The Leaf expander
The Leaf expander incorporates Nickel Titanium springs that will not require the patients' home activation
Hyrax expander
Hyrax expander incorporates a screw that requires the patients' home activation
Eligibility Criteria
Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.
Inclusion Criteria
* 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
* Missing teeth.
* Inadequate oral hygiene.
* Patients with bad oral habits.
* Patients with medical conditions.
* Patients with cleft lip and palate.
6 Years
12 Years
ALL
No
Sponsors
Meet the organizations funding or collaborating on the study and learn about their roles.
Cairo University
OTHER
Responsible Party
Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.
Noura Mohamed Hamza Hassan Saleh
Principal investigator
Other Identifiers
Review additional registry numbers or institutional identifiers associated with this trial.
24619942
Identifier Type: -
Identifier Source: org_study_id