INDIAN DENTAL ACADEMY
Leader in continuing dental education
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Introduction


Orthodontic tooth movement

Force
Active components???

www.indiandentalacademy.com
Introduction


Active components
Generate forces
In one direction
Equal and opposite force
Newton’s third law of motion

...
Introduction


Desired tooth movement is inevitably asso with an
opposing force.
Anchorage units
Anchorage loss
Anchorage...
Definitions
Moyers :
 “ Resistance to displacement.”
 Active elements and resistance elements.
T.M. Graber :
 “The natu...
Definitions
Proffit :


“Resistance to unwanted tooth movement.”



“Resistance to reaction forces that is provided
(usu...
Definitions
Nanda :


“The amount of movement of posterior teeth (molars,
premolars) to close the extraction space in ord...
Classification – Moyers
Anchorage
Intraoral

Muscular

Intramaxillary

Cervical
Occipital
Cranial
Facial

Intermaxillary
S...
Classification
Nanda :
1. A anchorage : critical / severe
75 % or more of the extraction space is needed for
anterior retr...
Classification

www.indiandentalacademy.com
Classification


Burstone



Group A: Postr teeth contribute less than one quarter
to total space closure



Group B: P...
Biologic Aspect Of Anchorage


Anchorage value
Teeth to be moved
Active components
Anchorage
Extraoral vs intraoral ancho...
Biologic Aspect Of Anchorage


Factors affecting anchorage value
Force magnitude

Physiologic force
concept
F/A

www.indi...
Biologic Aspect Of Anchorage


Surface area

Major determinant

Lower incisor vs molar anchorage
First principle of ortho...
Biologic Aspect Of Anchorage


For a tooth or group of teeth acting as anchorage
unit, pressure within the pdl should be ...
Biologic Aspect Of Anchorage


Pressure Response Curve for Anchor Teeth (A) and
Teeth to be Moved (M)



Pressure in the...
Biologic Aspect Of Anchorage



2nd factor – pressure distribution
Single force vs force couple

Second

principle of o...
Biologic Aspect Of Anchorage


Proffit
Tipping – 50-75 g
Bodily - 100-150 g
Intrusion - 50-75 g
Extrusion - 50-75 g
Rotat...
Biologic Aspect Of Anchorage



Tooth which is free to tip has a less anchorage value
than a tooth which is restricted in...
Biologic Aspect Of Anchorage


3rd factor – no. of roots and root morphology
Multirooted > single rooted
Longer rooted > ...
Biologic Aspect Of Anchorage





4th factor – neighbouring structures
Quality of the alveolar bone
Traumatic extracti...
Biologic Aspect Of Anchorage




Soft tissues
Fixed app incorporating lip bumper
Palatal button

www.indiandentalacadem...
Types of anchorage


Simple Anchorage:
‘Dental anchorage in which the
manner and application of force
tends to displace o...
Types of anchorage





Stationary Anchorage:
‘Dental anchorage in which the manner and
application of force tends to d...
Types of anchorage


Eg: Retraction of
mandibular incisors
using first molars as
anchorage



Considerably more than
Sim...
Types of anchorage



Reciprocal Anchorage:
Anchorage in which the
resistance of one or more dental
units is utilized to...
Types of anchorage


Correction of posterior cross bite through cross
elastics

www.indiandentalacademy.com
Types of anchorage

Close to reciprocal anchorage
www.indiandentalacademy.com
Types of anchorage





Multiple or Reinforced
Anchorage:
Multiple dental anchorage:
Reduces pressure on the anchor
uni...
Types of anchorage


Cortical Anchorage:



Torquing the roots of posterior teeth outward against
the cortical plate to ...
Types of anchorage


Intramaxillry anchorage/ traction


Resistance units are situated within the same jaw

www.indiande...
Types of anchorage


Intermaxillary anchorage/ traction
Resistance units situated in one jaw are used to
effect tooth mov...
Palatal and lingual arches

Maintain intermolar width
Restrict mesial tipping
Correction of rotations
www.indiandentalacad...
Two couple orthodontic appliance system :
Transpalatal arches


Two bracket system



Cinched



Passive and rigid

www...
Two couple orthodontic appliance system :
Transpalatal arches


Bilateral expansion

www.indiandentalacademy.com
Two couple orthodontic appliance system :
Transpalatal arches


Bilateral constriction

www.indiandentalacademy.com
Two couple orthodontic appliance system :
Transpalatal arches


Symmetrical V- Bend

Bilateral First order activations
(M...
Two couple orthodontic appliance system :
Transpalatal arches
Clinical uses


Required in non-extraction T/t



To count...
Two couple orthodontic appliance system :
Transpalatal arches
To decrease the arch perimeter
To close any remaining
poster...
Two couple orthodontic appliance system :
Transpalatal arches


Symmetrical V- Bend
Bilateral Second order
activations
(M...
Two couple orthodontic appliance system :
Transpalatal arches

•Correction of unilateral classII dental malocclusion
www.i...
Two couple orthodontic appliance system :
Transpalatal arches


Symmetrical V- Bend
Bilateral Third order activations
(Fa...
Two couple orthodontic appliance system :
Transpalatal arches


Asymmetrical V- Bend
Unilateral First order activations
(...
Two couple orthodontic appliance system :
Transpalatal arches


Asymmetrical V- Bend
Unilateral First order
activations
(...
Two couple orthodontic appliance system :
Transpalatal arches


Asymmetrical V- Bend
Unilateral Third order
activations
(...
Two couple orthodontic appliance system :
Transpalatal arches

Step bends
www.indiandentalacademy.com
Anchorage and choice of extraction

www.indiandentalacademy.com
Anchorage and choice of extraction

www.indiandentalacademy.com
Anchorage and choice of extraction

www.indiandentalacademy.com
Anchorage and choice of extraction

www.indiandentalacademy.com
Thank you
www.indiandentalacademy.com
Leader in continuing dental education

www.indiandentalacademy.com
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Anchorage in orthodontics /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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients

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Anchorage in orthodontics /certified fixed orthodontic courses by Indian dental academy

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Introduction  Orthodontic tooth movement Force Active components??? www.indiandentalacademy.com
  3. 3. Introduction  Active components Generate forces In one direction Equal and opposite force Newton’s third law of motion www.indiandentalacademy.com
  4. 4. Introduction  Desired tooth movement is inevitably asso with an opposing force. Anchorage units Anchorage loss Anchorage management www.indiandentalacademy.com
  5. 5. Definitions Moyers :  “ Resistance to displacement.”  Active elements and resistance elements. T.M. Graber :  “The nature and degree of resistance to displacement offered by an anatomic unit when used for the purpose of effecting tooth movement.” www.indiandentalacademy.com
  6. 6. Definitions Proffit :  “Resistance to unwanted tooth movement.”  “Resistance to reaction forces that is provided (usually) by other teeth, or (sometimes) by the palate, head or neck (via extraoral force), or implants in bone.” www.indiandentalacademy.com
  7. 7. Definitions Nanda :  “The amount of movement of posterior teeth (molars, premolars) to close the extraction space in order to achieve selected treatment goals.” Reversal of anchorage www.indiandentalacademy.com
  8. 8. Classification – Moyers Anchorage Intraoral Muscular Intramaxillary Cervical Occipital Cranial Facial Intermaxillary Simple Stationary Reciprocal Extraoral Single Compound Reinforced www.indiandentalacademy.com
  9. 9. Classification Nanda : 1. A anchorage : critical / severe 75 % or more of the extraction space is needed for anterior retraction . 2. B anchorage : moderate Relatively symmetric space closure (50%) 3. C anchorage : mild / non critical 75% or more of space closure by mesial movement of posterior teeth www.indiandentalacademy.com
  10. 10. Classification www.indiandentalacademy.com
  11. 11. Classification  Burstone  Group A: Postr teeth contribute less than one quarter to total space closure  Group B: Postr teeth contribute from one quarter to one half to total space closure  Group C: Postr teeth contribute more than one half to total space closure www.indiandentalacademy.com
  12. 12. Biologic Aspect Of Anchorage  Anchorage value Teeth to be moved Active components Anchorage Extraoral vs intraoral anchorage www.indiandentalacademy.com
  13. 13. Biologic Aspect Of Anchorage  Factors affecting anchorage value Force magnitude Physiologic force concept F/A www.indiandentalacademy.com
  14. 14. Biologic Aspect Of Anchorage  Surface area Major determinant Lower incisor vs molar anchorage First principle of orthodontic anchorage www.indiandentalacademy.com
  15. 15. Biologic Aspect Of Anchorage  For a tooth or group of teeth acting as anchorage unit, pressure within the pdl should be kept as low as possible Heavy forces www.indiandentalacademy.com
  16. 16. Biologic Aspect Of Anchorage  Pressure Response Curve for Anchor Teeth (A) and Teeth to be Moved (M)  Pressure in the PDL of A is less than the pressure in the PDL of M www.indiandentalacademy.com
  17. 17. Biologic Aspect Of Anchorage   2nd factor – pressure distribution Single force vs force couple Second principle of orthodontic anchorage www.indiandentalacademy.com
  18. 18. Biologic Aspect Of Anchorage  Proffit Tipping – 50-75 g Bodily - 100-150 g Intrusion - 50-75 g Extrusion - 50-75 g Rotation - 50-75 g Uprighting- 75- 125g www.indiandentalacademy.com
  19. 19. Biologic Aspect Of Anchorage  Tooth which is free to tip has a less anchorage value than a tooth which is restricted in tipping by the application of a force couple www.indiandentalacademy.com
  20. 20. Biologic Aspect Of Anchorage  3rd factor – no. of roots and root morphology Multirooted > single rooted Longer rooted > shorter rooted Triangular shaped root > conical or ovoid root Larger surface area > smaller surface area www.indiandentalacademy.com
  21. 21. Biologic Aspect Of Anchorage     4th factor – neighbouring structures Quality of the alveolar bone Traumatic extraction 2nd molars inclusion www.indiandentalacademy.com
  22. 22. Biologic Aspect Of Anchorage    Soft tissues Fixed app incorporating lip bumper Palatal button www.indiandentalacademy.com
  23. 23. Types of anchorage  Simple Anchorage: ‘Dental anchorage in which the manner and application of force tends to displace or change the axial inclination of the teeth that form the anchorage unit in the plane of space in which the force is being applied.’ www.indiandentalacademy.com
  24. 24. Types of anchorage    Stationary Anchorage: ‘Dental anchorage in which the manner and application of force tends to displace the anchorage unit bodily in the plane of space in which the force is being applied.’ Refers to the advantage that can be obtained by pitting bodily movement of one group of teeth against tipping of another www.indiandentalacademy.com
  25. 25. Types of anchorage  Eg: Retraction of mandibular incisors using first molars as anchorage  Considerably more than Simple Anchorage www.indiandentalacademy.com
  26. 26. Types of anchorage   Reciprocal Anchorage: Anchorage in which the resistance of one or more dental units is utilized to move one or more opposing dental units  Dissipation of equal and opposite forces  Diastema closure www.indiandentalacademy.com
  27. 27. Types of anchorage  Correction of posterior cross bite through cross elastics www.indiandentalacademy.com
  28. 28. Types of anchorage Close to reciprocal anchorage www.indiandentalacademy.com
  29. 29. Types of anchorage    Multiple or Reinforced Anchorage: Multiple dental anchorage: Reduces pressure on the anchor units moving them down the slope of the pressure-response curve Tissue - borne anchorage: www.indiandentalacademy.com
  30. 30. Types of anchorage  Cortical Anchorage:  Torquing the roots of posterior teeth outward against the cortical plate to inhibit their mesial movement www.indiandentalacademy.com
  31. 31. Types of anchorage  Intramaxillry anchorage/ traction  Resistance units are situated within the same jaw www.indiandentalacademy.com
  32. 32. Types of anchorage  Intermaxillary anchorage/ traction Resistance units situated in one jaw are used to effect tooth movement in the other jaw  Class III traction Class II traction www.indiandentalacademy.com
  33. 33. Palatal and lingual arches Maintain intermolar width Restrict mesial tipping Correction of rotations www.indiandentalacademy.com
  34. 34. Two couple orthodontic appliance system : Transpalatal arches  Two bracket system  Cinched  Passive and rigid www.indiandentalacademy.com
  35. 35. Two couple orthodontic appliance system : Transpalatal arches  Bilateral expansion www.indiandentalacademy.com
  36. 36. Two couple orthodontic appliance system : Transpalatal arches  Bilateral constriction www.indiandentalacademy.com
  37. 37. Two couple orthodontic appliance system : Transpalatal arches  Symmetrical V- Bend Bilateral First order activations (Mesiofacial Rotations) www.indiandentalacademy.com
  38. 38. Two couple orthodontic appliance system : Transpalatal arches Clinical uses  Required in non-extraction T/t  To counter the M-Li rotations produced by space closing forces  Before initiating head gear therapy www.indiandentalacademy.com
  39. 39. Two couple orthodontic appliance system : Transpalatal arches To decrease the arch perimeter To close any remaining posterior spaces To seat the molar properly for a classII molar finish Mesiolingual Rotations www.indiandentalacademy.com
  40. 40. Two couple orthodontic appliance system : Transpalatal arches  Symmetrical V- Bend Bilateral Second order activations (M-D tipping) www.indiandentalacademy.com
  41. 41. Two couple orthodontic appliance system : Transpalatal arches •Correction of unilateral classII dental malocclusion www.indiandentalacademy.com
  42. 42. Two couple orthodontic appliance system : Transpalatal arches  Symmetrical V- Bend Bilateral Third order activations (Facial Root Torque) •To upright the molar roots www.indiandentalacademy.com
  43. 43. Two couple orthodontic appliance system : Transpalatal arches  Asymmetrical V- Bend Unilateral First order activations (Mesiofacial Rotations) •Correction of unilateral classII dental malocclusion www.indiandentalacademy.com
  44. 44. Two couple orthodontic appliance system : Transpalatal arches  Asymmetrical V- Bend Unilateral First order activations (Mesiolingual Rotations) Unilateral Loss of molar anchorage is required www.indiandentalacademy.com
  45. 45. Two couple orthodontic appliance system : Transpalatal arches  Asymmetrical V- Bend Unilateral Third order activations (Facial Root Torque) •To correct the unilateral cross bites www.indiandentalacademy.com
  46. 46. Two couple orthodontic appliance system : Transpalatal arches Step bends www.indiandentalacademy.com
  47. 47. Anchorage and choice of extraction www.indiandentalacademy.com
  48. 48. Anchorage and choice of extraction www.indiandentalacademy.com
  49. 49. Anchorage and choice of extraction www.indiandentalacademy.com
  50. 50. Anchorage and choice of extraction www.indiandentalacademy.com
  51. 51. Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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