Which of the following is a removable functional appliance used for mandibular advancement? A) Quad-helix B) Herbst appliance C) Twin Block D) Hyrax expander

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The center of resistance of a maxillary central incisor is located approximately: a) At the CEJ b) At the midpoint of the crown c) At the apical one-third of the root d) At the junction of the middle and apical one-third of the root d) At the junction of the middle and apical one-third of the root

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