Intrusion Mechanics in Orthodontics

Intrusion is a desirable orthodontic tooth movement however it is limited principally by inadequate dental anchorage with conventional intrusion mechanics when an arch wire develops an active intrusion force against the anterior teeth; it simultaneously develops an extrusive force and tip- back moment against the anchor molars. Bilateral Mini-implants serve as an efficient source of anchorage for achieving true incisor intrusion of anterior teeth in deep overbite correction.Single mini implant placed below the anterior nasal spine is an effective and biologically sound method to achieve true incisor intrusion. They do not have any deleterious side effects on the posterior segment especially in patients withunfavorable growth patterns and non-growing patients.