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