Vertical control in SWA, Intrusion Mechanics (2)

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

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.