anchorage

ANCHORAGE

site of delivery from which a force is exerted

ANCHORAGE

the nature and degree of resistance to displacement offered by an anatomical unit when used for the purpose of affecting tooth movement

ANCHORAGE

resistance to any unwanted tooth movement

SIMPLE ANCHORAGE

tends to change the axial inclination of the tooth or teeth

SIMPLE ANCHORAGE

resistance to tipping

SIMPLE ANCHORAGE

root surface area of the anchorage units should at least double that of the units to be moved

STATIONARY ANCHORAGE

exist when the application of force tends to displace the anchorage units bodily in the plane of space

STATIONARY ANCHORAGE

resistance to bodily movement

RECIPROCAL ANCHORAGE

Resistance offered by two malposed units

RECIPROCAL ANCHORAGE

Resistance to each other is equal and opposite

RECIPROCAL ANCHORAGE

same force, opposite direction

INTRAMAXILLARY ANCHORAGE

Resistance units are situated within the same jaw

INTRAMAXILLARY ANCHORAGE

Ex: class I elastics

INTERMAXILLARY ANCHORAGE

Anchorage in which the units situated in one jaw are used to affect tooth movement in the jaw

INTERMAXILLARY ANCHORAGE

class II and III elastics

TEETH

Most frequently used anchorage units in Orthodontics

Round root

pdl fibers can be stretched in any direction

Flat (mesiodistal) roo

kaya iresist ang mesial and distal movements so mas madali siya imove buccolingually

larger or longer the roots

the more is their anchorage potential (size of root)

Multirooted teeth

provide greater anchorage

Mand 2nd PM

increased resistance to mesial movement

ALVEOLAR BONE

Resist bone deformation within limits

less anchorage

Less dense alveolar bone

Cervical

utilizing neck for anchorage

Occipital

utilizing the occipital region for anchorage

Cranial

utilizing the cranium as a source of anchorage

Facial

utilizing aspects of the face as a source of anchorage

Musculature

Anchorage derived from action of the muscles

Lip bumper

ex ng Musculature

SINGLE OR PRIMARY ANCHORAGE

Cases where the tooth to be moved is pitted against a tooth with a greater alveolar support area

COMPOUND ANCHORAGE

Type of anchorage provides for the use of more teeth with greater anchorage potential to move a tooth or group of teeth with lesser support

COMPOUND ANCHORAGE

Ex: n-mas retraction

REINFORCED OR MULTIPLE ANCHORAGE

The anchorage units are reinforced by the use of more than one type of resistance units

1. Number of teeth to be moved 2. Type of teeth to be moved 3. Type of Tooth Movement 4. Duration of Tooth Movement

ANCHORAGE PLANNING

MAXIMUM ANCHORAGE

Anchorage demand is high

MAXIMUM ANCHORAGE

No more than one-fourth the extraction space can be lost to forward movement of the anchor teeth

MAXIMUM ANCHORAGE

Required to increase the anchor teeth

MODERATE ANCHORAGE

The anchor teeth can be allowed to move forward into the extraction space for one fourth to half the total extraction space

MODERATE ANCHORAGE

Reinforcing the anchor unit may not be required

MINIMUM ANCHORAGE

More than half the extraction space needs to be closed by bringing the anchor teeth forward or to anchor loss