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Orthodontics - 3 Questions
Contraindications for activator include high FMA angle, severe protruded maxilla, and severe crowding. It is indicated for growing patients.
we are applying force distally only..force vector will rotate the tooth distally
A single force applied at which point of a tooth will allow complete translation of the tooth.
1) At the apex 2) At the incisal edge 3) At the center of resistance 4) At the center of rotation
SOLUTION
Center of resistance- Point analogous to the centers of gravity. Generally it is constant.In single root it lies between one third and one half of the root apical to alveolar crest. In multi rooted tooth it lies 1-2 mm apical to furcation