Biomechanics of Space Closure
CONTROLLED TIPPING: Is tooth movement with the center of rotation at the root apex. The resultant forces are distributed at the marginal portion of the periodontal ligament The M/F ratio is approx. 7/1 TRANSLATION or bodily movement maintains the axial inclination of the tooth and the centre of rotation is at infinity. The resultant force on the PDL is equally distributed along the pressure side of the alveolar structures. The M/F ratio is approx. 10/1 ROOT MOVEMENT or displacement of the tooth apex while the crown remains stationary occurs with a M/F ratio of approx. 12/1 here forces tend to be concentrated on the apical third of the root.
Within these basics lie the fundamental principles of anchorage control. www.indiandentalacademy.com