Functional orthopedic treatment seeks to correct malocclusions and harmonize the shape of the dental arch and oro-facial function. Functional appliance intended to alter mandibular growth, play a major role in growth modification treatment. Unfortunately due to the bulk and inconvenience, removable functional appliance fails to attract the patient's cooperation. In addition, their intermittent wear does not elicit continuous muscle activity, a factor that is very essential for promoting skeletal change. Patient cooperation has long been recognized as an important factor in the outcome of orthodontic treatment. Failure to adhere to prescribed schedules of removable appliance wear will result in slow treatment response or no response at all. To reduce these factors the fixed functional appliances were developed.