By Esequiel E. Rodriguez Yanez ; Coauthors, Larry White ... [et al.].

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3) Fig. 34. Separate canine retraction. Fig. 32. Mesial inclination of the roots of the upper molar. 8. 9. Distally incline the crowns of the upper canines at the moment of retraction. This is done in order to lessen the l()ss of anchorage of the posterior segment. Later on, the canine roots must be uprighted. Place a lingual arch as lower anchorage, while forces with Class II elastics are applied. Tips to reinforce anteroinferior anchorage (3) 1. The use of extra oral forces directed forward.

25. Root displacement without alteration of the position of the crown (torque). 14) , Fig. 27. Two equal forces that act upon a tooth but in opposed direction tend to produce pure rotation. 001 Tips for Orthodontics and Its Secrets What is a couple? A couple is defined as two parallel forces of the same magnitude but in opposite directions. (5) Clearly understanding the basic concepts of orthodontic biomechanics and the physiology of dental movement, we shall now analyze the different actions and reactions that can happen during the different stages of orthodontic treatment and select, apply and control in an efficient manner the force systems that will be utilized.

Positive torque in anteroinferior teeth. 6. 7. 8. Mesially incline the crowns of posterior teeth during their traction; this is done to ease the mesial movement of posterior teeth during space closure. Upright the posterior teeth roots subsequently. Use a transpalatine arch as anchorage while applying forces with Class III elastics. Place osseo integrated anchorage auxiliaries distal to the lower molars so they can act as intrabuccal absolute anchorage. (3) , J I Undesired movement control during the space closure phase ,I ; I Figs.

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