© 2006 - The Charles H. Tweed International Foundation
© 2006 - The Charles H. Tweed International Foundation
© 2006 - The Charles H. Tweed International Foundation
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<strong>Charles</strong> H. <strong>Tweed</strong>(1895~1970) <strong>Tweed</strong>’s Diagnostic Facial TriangleEn-masse anchorage preparationNewton’s third law “Everyaction has its equal andopposite reaction”Second Generation (1930~1970) <strong>Tweed</strong> Anchorage PreparationMicro implant can substitute“J” hook high pullheadgearVarious types of micro implantsLevern L. Merrifield(1921~2000)Directional forces techniqueusing high-pull “J”hooksFourth Generation (2000~)Fig. 1. Brief history of orthodontic anchorageThird Generation (1970~2000) PreparationSequential Anchorage36