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4.
ANCHORAGE = RESISTANCE TO UNWANTED
TOOTH MOVEMENT.
ANCHORAGE UNITS : The areas or units which
provide this undesirable movement.
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6. THE SITE OF DELIVERY FROM WHICH
FORCE IS EXERTED
- white n gardner
The nature and degree of resistance to
displacement offered by an anatomic unit
when used for the purpose of affecting
tooth movement
- GRABER
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8.
1.
2.
3.
1.
2.
Acc. to manner of the force application as:
Simple
Stationary
Reciprocal
Acc. to the jaws involved as :
Intra maxillary
Inter maxillary
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9.
1.
2.
3.
1.
2.
3.
Acc. to the site of anchorage
Intra oral
Extra oral
Muscular
Acc.to the no. of anchorage units as :
Simple
Compound
Reinforced
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10.
1.
2.
3.
4.
5.
6.
Acc. To white n gardner
Simple
Stationary
Reciprocal
Reinforced
Inter maxillary
Extra oral
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12. 1.
2.
Teeth
Root forms
Round – resistance is same in any direction
Flat – resist tooth movement in M-D direction eg. mand.
Incisors & molars , buccal roots of max. molars ( tripod
arrangement of roots )
Triangular – offers greater resistance to movement. Eg.
Maxillary canine & lateral incisor
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13. 1.
2.
3.
4.
5.
Size n no. of roots – large surface area & multirooted
teeth > resistance
Root length – deeper the root embeded > resistance
Position of tooth in the dental arch – eg. Mandi. 2 nd molar
is located bt. Two ridges of basal bone , so offer more
resistance to bodily movement
Inclination of tooth – axial inclination is in opposite
direction to force , greater resistance
Mutual support
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14. 1.
Basal bone – eg.hard
palate & lingual surface
of the mandible in
anterior region.
2.
The musculature –
Hypotonic m. - Flaring &
spacing
Hypertonic m. - Collapse
of the teeth lingually
eg.Nance palatal button
( use of hard palate to
provide resistance to
mesial movement of
max. molar
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18. Depends on : 1.
2.
3.
4.
5.
The number of teeth to be moved
The type of teeth to be moved
Type of tooth movement
Periodontal condition
Duration of tooth movement
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20. Within the same jaw ( either maxilla or
mandible )
Eg.Elastic chains are
used to retract the
anterior segment
using the posterior
teeth as anchorage
unit.
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23. Also called
“BAKER’S ANCHORAGE”
When the anchorage units situated in the one
jaw are used to provide the force required to
move teeth in the opposing jaw.
SUB DIVISION :
Simple
Staionary
Reciprocal
1.
2.
3.
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24.
Eg. When class II elastics are used to
retract the maxillary anteriors , the
anchorage units are situated in the
mandibular arch.
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27.
When the manner & application of force is
such that it tends to change the axial
inclination of the tooth or teeth that form the
anchorage unit in the plane of the space in
which the force is applied.
Simple anchorage is obtained by engaging
a greater number of teeth than are to be
moved
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28. NT: The root surface area of the anchorage unit
should be at least double that of the units to be
moved.
eg.
Anterior retraction with the
help of a HAWLEY’S
appliance
The movement of a single
tooth using a screw
appliance
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30.
When the application of force tends to displace
the anchorage unit bodily in the plane of space in
which force is being applied
The anchorage potential of teeth being moved
bodily is considerably greater as compare to
teeth being moved using a tipping force.
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31.
Mandibular molars are bodily pitted against
the tipping forces of the maxillary anteriors.
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33.
When two teeth or two sets of teeth move to an
equal extend in an opposite direction .
Here the root surface area of the anchorage unit
is equal to that of the teeth to be moved.
The effect of the forces exerted is equal.
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34. • Cross Elastic To Correct
Molar Cross-bite
Ni-Ti
Molar
Rotator
Arch expansion using a midline screw
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35. SINGLE OR PRIMARY ANCHORAGE
The resistance provided by single tooth
with greater alveolar support is used to
move another tooth with lesser alveolar
support.
Eg. Molar being used to retract a pre
molar
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36. COMPOUND ANCHORAGE
The resistance is provided by more than one
tooth with greater support is used to move
teeth with less support.
Eg. Retracting incisors using loop mechanics
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40.
SVED BITE PLANE :
Prevent from being
inclined labially.
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41.
A rigid labial bow :
To engage labial surface
of the incisor at the
junction of cervical &
incisal third of each
crown.
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42.
Banding of 2nd molar
for the retraction of
permanent canine
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49. Advantage
The anchorage unit is far away from the
actual site where the movement is taking
place, so less chances of any change in
the anchorage units
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50. Disadvantage
Lack of patient’s co- operation
Anchorage assembly is bulky & externally
visible
Decrease in the number of hours for which the
anchorage assembly is worn, so affects quality
of result achieved
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52.
Peri oral musculature is not so strong but also
resilient.
The forces generated by the musculature
sometimes used to bring about tooth
movement.
eg.Lip bumper appliance
(to distalize mandibular
1st molars)
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53. ANCHORAGE LOSS
It is the movement of the reaction unit or
the anchor unit instead of the teeth to be
moved.
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54. ANCHORAGE DEMAND
Depending on anchorage loss : -
1.
Maximum anchorage case
Moderate anchorage case
Minimum anchorage case
2.
3.
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55. Maximum anchorage cases
Anchorage demand is
very high
Not more than ¼ th of
the extraction space
should be lost by
forward movement of
the anchor teeth
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56. Moderate anchorage cases
Anchor teeth can be
permitted to move
forward into ¼ th to ½
of the extraction
space.
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