ANCHORAG
E
INDIAN DENTAL ACADEMY

Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacade...
INDEX
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




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
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

DEFINITION
CLASSIFICATION
FACTORS AFFECTIONG ANCHORAGE
SOURCES OF ANCHORAGE
ANCHORAGE PLANNING
...
INTRODUCTION

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

ANCHORAGE = RESISTANCE TO UNWANTED
TOOTH MOVEMENT.



ANCHORAGE UNITS : The areas or units which
provide this undesira...
DE INIT ION
F
IT

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THE SITE OF DELIVERY FROM WHICH
FORCE IS EXERTED
- white n gardner
The nature and degree of resistance to
displacement off...
CLASSIFICATION

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
1.
2.
3.

1.
2.

Acc. to manner of the force application as:
Simple
Stationary
Reciprocal
Acc. to the jaws involved as ...

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 :...

1.
2.
3.
4.
5.
6.

Acc. To white n gardner
Simple
Stationary
Reciprocal
Reinforced
Inter maxillary
Extra oral

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Factors affecting
anchorage

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1.
2.






Teeth
Root forms

Round – resistance is same in any direction
Flat – resist tooth movement in M-D direction...
1.
2.
3.

4.

5.

Size n no. of roots – large surface area & multirooted
teeth > resistance
Root length – deeper the root ...
1.

Basal bone – eg.hard
palate & lingual surface
of the mandible in
anterior region.

2.

The musculature –
Hypotonic m. ...
SOURCES OF ANCHORAGE

www.indiandentalacademy.com

1.
2.
3.
4.

1.
2.
3.
4.


INTRA –ORAL :
Individual teeth
Multiple tooth units
Encasement (eg.Inclined planes)
Occludi...
ANCHORAGE
PLANNING

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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
Periodon...
INTRA
MAXILLARY
ANCHORAGE

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Within the same jaw ( either maxilla or
mandible )
 Eg.Elastic chains are
used to retract the
anterior segment
using the ...
Sub- divisions
1.
2.
3.

Simple
Stationary
Reciprocal

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INTER MAXILLARY
ANCHORAGE

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Also called

“BAKER’S ANCHORAGE”



When the anchorage units situated in the one
jaw are used to provide the force requir...


Eg. When class II elastics are used to
retract the maxillary anteriors , the
anchorage units are situated in the
mandib...


CLASS III INTER MAXILLARY ELASTICS

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SIMPLE
ANCHORAGE

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



When the manner & application of force is
such that it tends to change the axial
inclination of the tooth or teeth t...
NT: The root surface area of the anchorage unit
should be at least double that of the units to be
moved.
eg.

Anterior ret...
STATIONARY
ANCHORAGE

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

When the application of force tends to displace
the anchorage unit bodily in the plane of space in
which force is being...


Mandibular molars are bodily pitted against
the tipping forces of the maxillary anteriors.

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RECIPROCAL
ANCHORAGE

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





When two teeth or two sets of teeth move to an
equal extend in an opposite direction .
Here the root surface area...
• Cross Elastic To Correct
Molar Cross-bite


Ni-Ti

Molar
Rotator



Arch expansion using a midline screw

www.indiande...
SINGLE OR PRIMARY ANCHORAGE


The resistance provided by single tooth
with greater alveolar support is used to
move anoth...
COMPOUND ANCHORAGE


The resistance is provided by more than one
tooth with greater support is used to move
teeth with le...
REINFORCED
ANCHORAGE

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

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

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

Anterior inclined plane
Exerts a backward
pull on the maxillary
appliance through the
mandible

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

SVED BITE PLANE :

Prevent from being
inclined labially.

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

A rigid labial bow :

To engage labial surface
of the incisor at the
junction of cervical &
incisal third of each
crown...


Banding of 2nd molar
for the retraction of
permanent canine

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EXTRA ORAL
ANCHORAGE

www.indiandentalacademy.com


The extra oral structure most commonly
used are :

1.

Cervical region
The occiput
The forehead
The chin

2.
3.
4.

www...
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Extra oral forces to augment
anchorage

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www.indiandentalacademy.com
www.indiandentalacademy.com
Advantage


The anchorage unit is far away from the
actual site where the movement is taking
place, so less chances of an...
Disadvantage





Lack of patient’s co- operation
Anchorage assembly is bulky & externally
visible
Decrease in the numb...
MUSCULAR
ANCHORAGE

www.indiandentalacademy.com





Peri oral musculature is not so strong but also
resilient.
The forces generated by the musculature
sometimes used ...
ANCHORAGE LOSS


It is the movement of the reaction unit or
the anchor unit instead of the teeth to be
moved.

www.indian...
ANCHORAGE DEMAND


Depending on anchorage loss : -

1.

Maximum anchorage case
Moderate anchorage case
Minimum anchorage ...
Maximum anchorage cases


Anchorage demand is
very high



Not more than ¼ th of
the extraction space
should be lost by
...
Moderate anchorage cases


Anchor teeth can be
permitted to move
forward into ¼ th to ½
of the extraction
space.

www.ind...
Minimum anchorage cases


Anchorage demand is
very low

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ADVANCEMENT
IN
ANCHORAGE

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REFERENCES






Contemporary Orthodontics –
(2nd edition)
BY WILLIUM R. PROFIT
Text book of orthodontics –
(1st edit...
Thank you
For more details please visit
www.indiandentalacademy.com

www.indiandentalacademy.com
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Anchorage ortho_ /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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Anchorage ortho_ /certified fixed orthodontic courses by Indian dental academy

  1. 1. ANCHORAG E INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. INDEX           DEFINITION CLASSIFICATION FACTORS AFFECTIONG ANCHORAGE SOURCES OF ANCHORAGE ANCHORAGE PLANNING DIFFERENT ANCHORAGES ANCHORAGE LAOSS & DEMAND ADVANCEMENT IN ANCHORAGE CONCLUSION REFERENCES www.indiandentalacademy.com
  3. 3. INTRODUCTION www.indiandentalacademy.com
  4. 4.  ANCHORAGE = RESISTANCE TO UNWANTED TOOTH MOVEMENT.  ANCHORAGE UNITS : The areas or units which provide this undesirable movement. www.indiandentalacademy.com
  5. 5. DE INIT ION F IT www.indiandentalacademy.com
  6. 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  www.indiandentalacademy.com
  7. 7. CLASSIFICATION www.indiandentalacademy.com
  8. 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 www.indiandentalacademy.com
  9. 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 www.indiandentalacademy.com
  10. 10.  1. 2. 3. 4. 5. 6. Acc. To white n gardner Simple Stationary Reciprocal Reinforced Inter maxillary Extra oral www.indiandentalacademy.com
  11. 11. Factors affecting anchorage www.indiandentalacademy.com
  12. 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 www.indiandentalacademy.com
  13. 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 www.indiandentalacademy.com
  14. 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 www.indiandentalacademy.com
  15. 15. SOURCES OF ANCHORAGE www.indiandentalacademy.com
  16. 16.  1. 2. 3. 4.  1. 2. 3. 4.  INTRA –ORAL : Individual teeth Multiple tooth units Encasement (eg.Inclined planes) Occluding teeth OTHERS : Holding Arches Basal bone Neck cranium Occipital region MUSCULATURE : lip bumper www.indiandentalacademy.com
  17. 17. ANCHORAGE PLANNING www.indiandentalacademy.com
  18. 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 www.indiandentalacademy.com
  19. 19. INTRA MAXILLARY ANCHORAGE www.indiandentalacademy.com
  20. 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.  www.indiandentalacademy.com
  21. 21. Sub- divisions 1. 2. 3. Simple Stationary Reciprocal www.indiandentalacademy.com
  22. 22. INTER MAXILLARY ANCHORAGE www.indiandentalacademy.com
  23. 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. www.indiandentalacademy.com
  24. 24.  Eg. When class II elastics are used to retract the maxillary anteriors , the anchorage units are situated in the mandibular arch. www.indiandentalacademy.com
  25. 25.  CLASS III INTER MAXILLARY ELASTICS www.indiandentalacademy.com
  26. 26. SIMPLE ANCHORAGE www.indiandentalacademy.com
  27. 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 www.indiandentalacademy.com
  28. 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 www.indiandentalacademy.com
  29. 29. STATIONARY ANCHORAGE www.indiandentalacademy.com
  30. 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. www.indiandentalacademy.com
  31. 31.  Mandibular molars are bodily pitted against the tipping forces of the maxillary anteriors. www.indiandentalacademy.com
  32. 32. RECIPROCAL ANCHORAGE www.indiandentalacademy.com
  33. 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. www.indiandentalacademy.com
  34. 34. • Cross Elastic To Correct Molar Cross-bite  Ni-Ti Molar Rotator  Arch expansion using a midline screw www.indiandentalacademy.com
  35. 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 www.indiandentalacademy.com
  36. 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 www.indiandentalacademy.com
  37. 37. REINFORCED ANCHORAGE www.indiandentalacademy.com
  38. 38.  The anchorage units are reinforced by the use of more than one type of resistance units. www.indiandentalacademy.com
  39. 39.  Anterior inclined plane Exerts a backward pull on the maxillary appliance through the mandible www.indiandentalacademy.com
  40. 40.  SVED BITE PLANE : Prevent from being inclined labially. www.indiandentalacademy.com
  41. 41.  A rigid labial bow : To engage labial surface of the incisor at the junction of cervical & incisal third of each crown. www.indiandentalacademy.com
  42. 42.  Banding of 2nd molar for the retraction of permanent canine www.indiandentalacademy.com
  43. 43. EXTRA ORAL ANCHORAGE www.indiandentalacademy.com
  44. 44.  The extra oral structure most commonly used are : 1. Cervical region The occiput The forehead The chin 2. 3. 4. www.indiandentalacademy.com
  45. 45. www.indiandentalacademy.com
  46. 46. Extra oral forces to augment anchorage www.indiandentalacademy.com
  47. 47. www.indiandentalacademy.com
  48. 48. www.indiandentalacademy.com
  49. 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 www.indiandentalacademy.com
  50. 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 www.indiandentalacademy.com
  51. 51. MUSCULAR ANCHORAGE www.indiandentalacademy.com
  52. 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) www.indiandentalacademy.com
  53. 53. ANCHORAGE LOSS  It is the movement of the reaction unit or the anchor unit instead of the teeth to be moved. www.indiandentalacademy.com
  54. 54. ANCHORAGE DEMAND  Depending on anchorage loss : - 1. Maximum anchorage case Moderate anchorage case Minimum anchorage case 2. 3. www.indiandentalacademy.com
  55. 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 www.indiandentalacademy.com
  56. 56. Moderate anchorage cases  Anchor teeth can be permitted to move forward into ¼ th to ½ of the extraction space. www.indiandentalacademy.com
  57. 57. Minimum anchorage cases  Anchorage demand is very low www.indiandentalacademy.com
  58. 58. ADVANCEMENT IN ANCHORAGE www.indiandentalacademy.com
  59. 59. www.indiandentalacademy.com
  60. 60. www.indiandentalacademy.com
  61. 61. www.indiandentalacademy.com
  62. 62. www.indiandentalacademy.com
  63. 63. www.indiandentalacademy.com
  64. 64. www.indiandentalacademy.com
  65. 65. www.indiandentalacademy.com
  66. 66. REFERENCES      Contemporary Orthodontics – (2nd edition) BY WILLIUM R. PROFIT Text book of orthodontics – (1st edition) BY GURKEERAT SINGH Orthodontics principles and practice (3rd edition) BY GRABER Textbook of orthodontics – ( 3rd edition) BY M.S RANI Internet – (www.google.com) (http:www.miniimplantanchorage.com) www.indiandentalacademy.com
  67. 67. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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