RecruitingNot ApplicableNCT07362160

Clear Orthodontic Expander Versus Hyrax

Evaluating the Clinical Performance of a Novel Clear Orthodontic Expander Versus Hyrax: A Randomized Clinical Trial

Sponsor

University of Baghdad

Enrollment

40 participants

Start Date

Feb 1, 2026

Study Type

INTERVENTIONAL

Conditions

Narrow Maxilla Malocclusion

Summary

This study will be conducted to evaluate the effectiveness of a clear expander fabricated from 2-mm biocompatible polyethylene terephthalate glycol (PETG) thermoforming material integrated with an expansion screw in achieving dental and skeletal expansion in adolescent patients, compared with the conventional Hyrax expander.

Eligibility

Min Age: 10 YearsMax Age: 14 Years

Inclusion Criteria5

Patients' age at the start of treatment will range from 10-14 years.
Unstable unilateral or bilateral posterior crossbite due to maxillary constriction.
The first molars are fully erupted.
Good oral health free from caries and periodontal problems at the start of treatment.
Good general health.

Exclusion Criteria5

Patients with obvious facial asymmetry.
Patients with orofacial cleft.
Patients with previous orthodontic treatment.
Patients with bad oral habits.
Patients with active periodontal disease.

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Interventions

DEVICENew clear expander

All patients with a clear expander will be instructed to wear the appliance 24 hours a day, except during eating and cleaning. The expander will be activated twice daily (0.2 mm per turn). Patients will be provided with an instruction brochure and advised to use a reminder to ensure compliance. The expansion will continue until the desired amount of the maxillary arch expansion occurs when the maxillary first molars' palatal cusps occlude the lingual side of the mandibular first molar buccal cusps to overcome the expected relapse due to the elasticity of the palatal soft tissue.

DEVICEHyrax expander

The activation protocol for the Hyrax expander will be the same in all patients, twice daily (0.2 mm per turn). The expansion will continue until the desired amount of the maxillary arch expansion occurs when the maxillary first molars' palatal cusps occlude the lingual side of the mandibular first molar buccal cusps to overcome the expected relapse due to the elasticity of the palatal soft tissue.