Inclusion Criteria:  Adolescent males and females (14-18 years) with Bilaterally unerupted developing third molars. Not more than two thirds of the root development of the third molars had taken place.  Dental Class I malocclusion cases requiring four premolar extraction with a moderate anchorage requirement. low or increased vertical dimension.  Exclusion Criteria:  Premolar extraction cases requiring maximum anchorage preparation.  Low vertical dimension. patients without dentofacial deformities, severe facial asymmetries, or missing teeth.