A randomized clinical trial to introduce a modified 3D printed customized maxillary protraction facemask and evaluate its efficacy in comparison with the conventional maxillary protraction facemask therapy in correction of Class III malocclusion of young patients

It is a multicenter randomized clinical trial with two parallel arms. The patients will be randomly divided into two groups, group one: conventional facemask appliance will be used while group two, the modified facemask appliances. Lateral cephalometric x-ray, Study models, photographs, and patient questionnaire will be taken before starting the treatment (T0) and at the end of treatment (T1). The effectiveness of the two appliances will be assessed and measured comparing patient's records before and after treatment.

Inclusion Criteria:

1. Skeletal and dental relationships: skeletal class III with retrognathic maxilla and normal mandible with overjet < 0 mm.
2. Concave profile with normal lower facial height (clinically and radiographically).
3. Good oral health free from caries and periodontal problems at the start of treatment.

Exclusion Criteria:

1. Previous history of orthopedic and/or orthodontic treatment.
2. Patients with vertical growth pattern or backward mandibular rotation tendency.
3. Patients with gross facial asymmetry.
4. Patients with cleft lip and palate and/or craniofacial syndrome
5. Patients with bad oral habit.
6. Active periodontal disease.
7. Previous history of TMJ signs or symptoms

Blinding to treatment allocation is possible only for the outcomes assessor because the clinicians know the intervention. The trial documents will be labeled with ID number, which be used for participant identification and data collection without unmasking the allocation group