Eruption / extrusion of post. teeth. Stable process – accompanies vert. facial dev. Contributing factor – bite opening – deep bite patients. vertical facial ht. – growing patients – accommodates extrusion of post. teeth during ortho trt. Not stable – adults – low mand. plane angles. Musculature – resists extrusion. High angle cases – weak musculature – stable results. àPermanent opening of mand. plane - undesired Principles of ant. intrusion. Use of optimal magnitude of forces & delivery with low LDR springs. Use of point contacts in ant. region ( statically determinant system) Position of force – selection of the point of application of force with respect to CR. Selective intrusion based on ant. tooth geometry. Control – reactive units – post. Anchorage unit. Inhibition – erupn. of post. teeth.
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