Thirteen patients with developing skeletal Class II malocclusion will be treated with Myobrace functional appliance for six months.

Thirteen patients with developing skeletal Class II malocclusion will be treated with Twinblock functional appliance for six months.

An Appliance for treating growing Class II patients with mandibular deficiency

Angle formed between points Sella, Nasion and A point and describes anteroposterior position of the maxilla relative to the anterior cranial base.

Angle formed between points Sella, Nasion and B point and describes anteroposterior position of the mandible relative to the anterior cranial base.

Angle formed between points A, Nasion and B point indicating the skeletal relationship between the maxilla and the mandible.

The linear distance between the perpendicular projections of points A and B over the functional occlusal plane.

Angle formed between mandibular plane and Frankfort horizontal plane.

The upper border of Naso Pharyngeal air way area will be delineated by a line extending from the harmonium (H) to the posterior nasal spine. The lower extent of the NPAA will be traced by marking a line at the tip of the soft palate parallel to the Frankfort horizontal (FH) plane extending to the posterior wall of the pharynx. The OPAA and LPAA are differentiated by a line drawn at the level of the tip of epiglottis parallel to the FH plane to the posterior wall of the pharynx. The lower border of the LPAA is defined as a line drawn parallel to FH plane and passing through the anteroinferior most point (C5AI) of the fifth cervical vertebra. Area will be measured.