Comparison Between Aesthetic Functional Appliances and Twin Block in Correction of Skeletal Class II

The sample will be randomly divided into 2 equal groups according to the appliance will be used:

Group 1: Aesthetic Functional appliance Group 2: Twin block

Methods:

*Radiographs (CBCT) will be taken before starting the treatment (T1) and after obtaining Class I occlusion and normal overjet (T2) by sequential appliances.

appliances.

• Lateral cephalograms -extracted from CBCT- will be used to evaluate the effect of the two appliances.
• CBCT will be used to evaluate root resorption and bony changes in the condyle .

Inclusion criteria

• Skeletal Class II pattern with ANB angle exceeding 6° and Wits appraisal of 2 mm or more.
• Mandibular deficiency (SNB angle less than 77°).
• Growing patients.
• No prior orthodontic intervention.
• The vertical skeletal classification shows a horizontal or neutral growth pattern.
• Overjet ≥ 8mm.

Exclusion criteria

• Developmental abnormalities with atypical or irregular patterns of growth and maturation.
• Any indications or manifestations, as well as any prior medical records, of Tempro-Mandibular Joint (TMJ) disorders, such as the presence of clicking, pain, limitations, or deviations.