•1) anterior intrusion (壓低前牙) •2)posterior tip-back(磨牙後傾) lever的定義(分成 CLASS I II III 三種) Distal Movement of Maxillary Molars Using a Lever-arm and Mini-implant System CONSIDERATIONS FOR THE ORTHODONTIC CORRECTION OF IMPACTED TEETH(內有lever arm的圖) Bone regeneration by bodily tooth movement:Dental computed tomography examination of a patient  Clinical evaluation of the centre of resistance of the upper incisors during retraction The responsibility of the dentist and orthodontistSuccessfully treated symptoms of CMD / Range of success  The Orthodontic therapy with the Hinge mechanics