Ortho II (Finals) - 3 Anchorage in Orthodontics pt.2

The dental anchorage in which the manner and application of force is such that it tends to change the axial inclination (tipping) of the anchor of the tooth or teeth in the plane of space in which the force is being applied

In this type of anchorage, the appliance usually engages a greater number of teeth that are to be moved within the same arch

Amount of force on each anchor tooth = total moving force component of the appliance divided by the number of anchored teeth

The manner of application of force tends to displace the anchorage unit bodily in the plane of space in which this force is being applied Provides greater resistance to unwanted tooth movement (anchor loss)

Refers to the resistance offered by two malposed units, when the dissipation of equal and opposite forces tends to move each unit toward a more normal occlusion

- In some treatment procedures, it is desirable to move teeth or groups of teeth with equal anchorage potential in opposite directions

The resistance units are situated within the same jaw

The resistance units are situated to affect tooth movement in the other jaw

-Perioral musculature may be used as anchorage units in certain cases

-Lip bumper myofunctional orthodontic appliance utilizes the force exerted by lower lip musculature to bring about distalization of mandibular first molar

Advantages of Extraoral anchorage

• Stability

• Less risk of anchor loss

• Success depends on patient compliance (12-15 hours/day)

• Discouraging to patients due to metallic framework

• Self-esteem