Clinical trial Recruiting at 1 site Interventional Ages 9 to 12

Clear twin block for growing patients with class II malocclusion

Official title: Dento-skeletal Effects of Clear Twin Block Treatment at Specific Period in Growing Patients: A CBCT Based Controlled Clinical Trial

Run by University of Baghdad · NCT07924982 · Data updated 2026-11-12

This study tests whether wearing a clear twin block appliance for 3 months helps correct dento-skeletal differences in kids aged 9–12 with Class II Division 1 malocclusion.

Quick facts

Study typeInterventional
Ages9 Years to 12 Years
SexAll
Enrollment40 (estimated)
SponsorUniversity of Baghdad
Academic / other
Locations1 site (Baghdad, Baghdad Governorate)
StatusRecruiting
StartedOctober 20, 2026
Main results expectedJanuary 25, 2027
Study endsJanuary 30, 2027
Registry record updatedNovember 9, 2026
Trial IDNCT07924982 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal participants are 9–12 years old with Class II Division 1 malocclusion and a Class 2 skeletal pattern who consent to participate.

Probably not a fit

Patients who are older teens, do not have the target malocclusion pattern, or refuse participation may not benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

Forty children with Class II Division 1 malocclusion and a Class 2 skeletal pattern will wear a digital twin block appliance for three months (16 hours per day). The study will collect dental and skeletal records before and after treatment, including photographs, cephalometric radiographs, digital dental models, and optional CBCT data. Primary outcomes include changes in overbite, overjet, and inter-canine and inter-molar widths. The trial is conducted under the University of Baghdad in Baghdad, with parental informed consent obtained for all participants.

Why it matters

Potential benefit: If successful, the appliance could improve bite alignment and facial balance in growing patients.

How similar studies have gone: Prior evidence in orthodontics suggests clear aligner-like approaches can influence dento-skeletal changes in growing patients, but results vary by protocol and population.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* age ranged from 9 to 12 years
* class Ⅱ Div1 mal-occlusion and class 2 skeletal pattern

Exclusion Criteria:

* Adults (passing the puberty)
* Refuse to participate in the study
* Uncooperative patients

Where it's running

  • Samer Salim Othman
    Baghdad, Baghdad Governorate, Iraq
    Recruiting

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 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.