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RECRUITING Not applicable ClinicalTrials.gov

Maxillary Arch Distalization With Infrazygomatic Crest Miniscrews for Class II Malocclusion

Sponsor: Mansoura University • ClinicalTrials.gov ID: NCT07875660

Registry updated: 2026-10-20
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Description

This prospective clinical study will evaluate the effects of moving the entire upper dental arch backward using infrazygomatic crest miniscrews in participants with Class II malocclusion. Class II malocclusion is a type of bite problem in which the upper and lower teeth do not have a normal front-to-back relationship. Infrazygomatic crest miniscrews provide temporary skeletal anchorage that can be used to move the upper teeth backward while reducing dependence on patient cooperation. Participants will receive orthodontic treatment using bilateral infrazygomatic crest miniscrews connected to the upper orthodontic archwire through power arms and elastomeric chains. Changes produced by treatment will be evaluated using clinical photographs, radiographs, and digital dental models obtained before distalization and after correction of the Class II molar relationship. The study will assess dental, skeletal, soft-tissue, and maxillary arch changes associated with this treatment approach.

Interventions

  • Infrazygomatic Crest Miniscrews (Device)
    Two bilateral infrazygomatic crest miniscrews (Ortho Central, Korea), 2 mm in diameter and 12 mm in length, will be used as skeletal anchorage for en-masse maxillary arch distalization. The miniscrews will be inserted in the infrazygomatic crest region, commonly between the maxillary first and second molars, approximately 11 mm above the occlusal plane. Six-millimeter power arms will be placed bilaterally between the maxillary lateral incisor and canine. Closed elastomeric power chains will connect the miniscrews to the archwire hooks, applying approximately 350 g of distalizing force.

Eligibility criteria

Inclusion Criteria: 1. Age between 15 and 30 years. 2. Non-extraction treatment plan, except for third molar extraction when indicated. 3. Class II molar relationship 4. Absence of any syndrome or systemic disease. 5. No history of previous orthodontic treatment. 6. Good oral hygiene. Exclusion Criteria: 1. Patients indicated for extraction treatment. 2. Patients showing symptoms of temporomandibular disorders. 3. Patients with periodontal diseases.

Conditions

Class II Malocclusion

Locations

  • Mansoura University — Al Mansurah, Dakahlia Governorate, Egypt
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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

View Official Record