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Not all patients with deep overbite should be treated with the same mechanics. Some
patients require intrusion of the anterior teeth, while others require primarily extrusion.
This article has discussed the principles of incisor and canine intrusion and has
demonstrated the use of intrusion springs that are capable of intruding incisors with
minimal side effects on the posterior teeth. Six principles must be considered in
incisor or canine intrusion: (1) the use of optimal magnitudes of force and the delivery
of this force constantly with low-load-deflection springs; (2) the use of a single
point contact in the anterior region; (3) the careful selection of the point of force
application with respect to the center of resistance of the teeth to be intruded;
(4) selective intrusion based on anterior tooth geometry; (5) control over the reactive
units by formation of a posterior anchorage unit; and (6) inhibition of eruption of
the posterior teeth and avoidance of undesirable eruptive mechanics.