[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100631401":3},{"organization":4,"armGroups":7,"interventions":20,"overallOfficials":31,"centralContacts":39,"locations":46,"responsibleParty":63,"collaborators":26,"id":67,"slug":68,"hasResults":69,"nctId":70,"briefTitle":71,"officialTitle":72,"acronym":73,"eligibilityCriteria":74,"healthyVolunteers":69,"sex":75,"minAge":76,"maxAge":77,"enrollmentInfo":78,"targetDuration":26,"studyType":81,"phases":82,"briefSummary":84,"conditions":85,"keywords":89,"overallStatus":96,"whyStopped":26,"lastUpdateSubmitDate":97,"lastUpdatePostDateStruct":98,"startDateStruct":101,"completionDateStruct":102,"leadSponsor":104,"locationsCount":105},{"fullName":5,"class":6},"Al-Azhar University","OTHER",[8,14],{"label":9,"type":10,"description":11,"interventionNames":12},"Group A:Quad Helix Appliance","EXPERIMENTAL","Participants in this group will receive treatment using a fixed Quad Helix (QH) appliance to correct posterior cross-bite. The appliance is fabricated using stainless steel wire and soldered to bands on the upper first permanent molars.",[13],"Device: Quad Helix(QH) Appliance",{"label":15,"type":16,"description":17,"interventionNames":18},"Group B: Rapid maxillary expanders","ACTIVE_COMPARATOR","Participants in this group will receive treatment using fixed Rapid Maxillary Expanders (RME) bonded on the upper first permanent molars and pre-molars",[19],"Device: Rapid Maxillary Expanders",[21,27],{"type":22,"name":23,"description":24,"armGroupLabels":25,"otherNames":26},"DEVICE","Quad Helix(QH) Appliance","It is a fixed orthodontic appliance fabricated using stainless-steel wire and soldered to bands on upper first permanent molars.",[9],null,{"type":22,"name":28,"description":29,"armGroupLabels":30,"otherNames":26},"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)",[15],[32,36],{"name":33,"affiliation":34,"role":35},"Al Dany Atwa Mohamed, Professor","Faculty of dental medicine(boys) Cairo ,Al Azhar University","STUDY_CHAIR",{"name":37,"affiliation":34,"role":38},"Mahmoud Mohamed Fathy Abo ELMahasen, Associated Professor","STUDY_DIRECTOR",[40],{"name":41,"role":42,"phone":43,"phoneExt":44,"email":45},"Moustafa Galal Borham Moustafa Saad, Bachelor of dental Science","CONTACT","+201026896894","+201155874709","moustafagalal.1.209@azhar.edu.eg",[47],{"facility":48,"status":26,"city":49,"state":50,"zip":51,"country":52,"countryCode":53,"cosmosGeoPoint":54,"geoPoint":59,"contacts":60},"Faculty of Dental medicine (boys) ,Cairo,Al-Azhar University","Cairo","Cairo Governorate","00000","Egypt","EG",{"type":55,"coordinates":56},"Point",[57,58],31.24967,30.06263,{"lat":58,"lon":57},[61],{"name":62,"role":42,"phone":43,"phoneExt":44,"email":45},"Moustafa G Saad, BDS",{"type":64,"investigatorFullName":65,"investigatorTitle":66,"investigatorAffiliation":5,"oldNameTitle":26,"oldOrganization":26},"PRINCIPAL_INVESTIGATOR","Moustafa Galal Borham Moustafa Saad","Dentist at orthodontic Department, Faculty of dental medicine, Al Azhar University","100631401","quad-helix-vs-rme-for-posterior-cross-bite-in-egyptian-children-100631401",false,"NCT07500194","Quad Helix vs RME for Posterior Cross-bite in Egyptian Children","Quad Helix Versus Rapid Maxillary Expanders in the Treatment of Posterior Cross-bite During Mixed Dentition in a Sample of Egyptian Children: A Randomized Clinical Study.","Expansion","Inclusion Criteria:\n\n1. Children aged 9-12 years in the mixed dentition stage\n2. Presence of posterior cross-bite due to transverse maxillary deficiency\n3. No previous history of orthodontic treatment\n4. Good oral hygiene and cooperative behavior\n5. No significant antero-posterior or vertical skeletal discrepancies\n\nExclusion Criteria:\n\n1. Patient with craniofacial anomalies\n2. Presence of systemic diseases or syndromes affecting bone metabolism\n3. Extensive dental caries or untreated periodontal disease\n4. History of trauma or surgery affecting the maxilla or mandible","ALL","9 Years","12 Years",{"count":79,"type":80},20,"ESTIMATED","INTERVENTIONAL",[83],"NA","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.",[86,87,88],"Posterior Crossbite","Maxillary Expansion","Transverse Maxillary Deficiency",[90,91,92,93,94,95],"Quad Helix","Rapid Maxillary Expansion","Posterior cross-bite","Mixed Dentition","Egyptian children","Randomized clinical trials","NOT_YET_RECRUITING","2026-03-24",{"date":99,"type":100},"2026-03-30","ACTUAL",{"date":99,"type":80},{"date":103,"type":80},"2028-03-31",{"name":5,"class":6},1]