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INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
CUSPID RETRACTION – THE FIRST STEP

The canine – its special

Key role in canine protected occlusion
Anterior smile and fa...
The canine – its special
Severely malpositioned canines –a
biomechanical challenge
Placing a super elastic wire in severel...
Does segmental cuspid retraction
followed by incisor retraction
conserve anchorage ?

NO

Segmental canine retraction
indi...
Factors For Biomechanical Design
You need to control
1.Force magnitude and direction
2.Force constancy(Low Load Deflection...
Control over the Center of rotation
will define the type of tooth
movement
Axial inclination of the canines is an
importan...
Single force on a
1. mesially inclined
tooth
tips it further
mesially.
•M:F 12:1 for
root movement
2. Upright tooth
tips i...
Do you think a NiTi wire will generate
a M:F ratio of 12:1 to upright this tooth ??
Should you go segmental ??
www.indiand...
The ‘T’ loop is the answer !!

www.indiandentalacademy.com
‘T’ Loop
Introduced by Burstone in 1982
Most researched and documented spring in
orthodontics
Perhaps least used !!!
Diffe...
10 mm
2 mm
4 mm
BETA
(POSTERIOR) SEGMENT

5 mm
ALPHA
(ANTERIOR) SEGMENT

Standard ‘T’ loop (0.017x0.025” TMA)

Alpha
momen...
Neutral position:
0 mm activation
0 gm force
Concept of differential moments:
activation 6 mm – M:F at anterior seg. 5:1
3...
Centered V Bend
Intrusive forces=extrusive forces
Opposing moments /2 couple system
Off-centered V bend
Moment greater in ...
0.017x0.025” TMA/centered T loop
Activation: 6 mm
F/A = 33 gm/mm
1126 gm-mm

1002 gm-mm

201 gm

168 gm
Deactivation: 1 mm...
0.017x0.025” SS/vertical loop

Activation: 0.2 mm
F/A = 1000 gm/mm

200 gm

0 gm

Deactivation: 0.2 mm
Clinically impossib...
‘T’ loop has a low load deflection rate
of 33 gm per millimeter.
An error in activation of 1 mm results in an
error of onl...
6 mm activation
M/F=6:1
Tipping

2 mm Deactivation
M/F=10:1
Translation
4 mm Deactivation
M/F =12:1
Root Movement
www.indi...
FORCE SYSTEM GENERATED BY ‘T’ SPRING
FOR INTER-BRACKET DISTANCE OF 25 MM
DISPLACEMENT

FORCE
(GM)

0
1
2
3
4
5
6
7

ANTERI...
SEGMENTAL CUSPID RETRACTION
Minor Cuspid Retraction
Favorable root inclination,mild crowding
Placing cuspid in class1 rela...
Minor Cuspid retraction
Cuspid Retraction > 2mm
Controlled tipping
M/F = 8:1
Controlled Tip
017x025 TMA ,45Degree
bend in ...
The‘

T

www.indiandentalacademy.com

loop
’
0.017 x 0.025” TMA wire

www.indiandentalacademy.com
www.indiandentalacademy.com
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5mm

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5mm

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10mm

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5mm

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4mm

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10 mm
2 mm
4 mm

BETA
(POSTERIOR) SEGMENT

5 mm

ALPHA
(ANTERIOR) SEGMENT

www.indiandentalacademy.com
Pre-activation bends
β

D = L- A
2
www.indiandentalacademy.com

α
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www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
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β

α
1

2

5

6

3

4

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Anti-rotation bends

1

2

www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
Why bypass mechanics?
Unfavorable movement of the incisors
-one of the major disadvantages of PEA
Need to maintain incisor...
Walking the canine:
Normal component of force and frictional resistance
Tooth tips until opposing corners contact the wire...
Canine uprighting – couples generated by
wire-bracket contact
Beware: do not see your patient before 4 wks
min. 4 weeks ti...
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
OSTEOGENIC DISTRACTION OF
CANINES: EXCITING PROSPECTS

www.indiandentalacademy.com
6 mm and 11 days – believe it or not !!

www.indiandentalacademy.com
Thank you
For more details please visit
www.indiandentalacademy.com

www.indiandentalacademy.com
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The canine retraction /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

The canine retraction /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. CUSPID RETRACTION – THE FIRST STEP The canine – its special Key role in canine protected occlusion Anterior smile and facial aesthetics Long Root, proximity to cortical plates Class 1 canine relationship is a prime orthodontic treatment objective Cuspid retraction the first step www.indiandentalacademy.com
  3. 3. The canine – its special Severely malpositioned canines –a biomechanical challenge Placing a super elastic wire in severely displaced situations will only magnify side effects ,extend time in therapy without results www.indiandentalacademy.com
  4. 4. Does segmental cuspid retraction followed by incisor retraction conserve anchorage ? NO Segmental canine retraction indicated to relieve severe crowding, correct a class1 relation ship,maintain the midline www.indiandentalacademy.com
  5. 5. Factors For Biomechanical Design You need to control 1.Force magnitude and direction 2.Force constancy(Low Load Deflection) 3.Control over the center of rotation 4.Change in M/F ratio with deflection www.indiandentalacademy.com
  6. 6. Control over the Center of rotation will define the type of tooth movement Axial inclination of the canines is an important factor www.indiandentalacademy.com
  7. 7. Single force on a 1. mesially inclined tooth tips it further mesially. •M:F 12:1 for root movement 2. Upright tooth tips it mesially •M:F 10:1 for translation 3. Distally inclined Tooth uprights it •M:F 7:1 for tipping www.indiandentalacademy.com
  8. 8. Do you think a NiTi wire will generate a M:F ratio of 12:1 to upright this tooth ?? Should you go segmental ?? www.indiandentalacademy.com
  9. 9. The ‘T’ loop is the answer !! www.indiandentalacademy.com
  10. 10. ‘T’ Loop Introduced by Burstone in 1982 Most researched and documented spring in orthodontics Perhaps least used !!! Differential space closure Min Patient Cooperation-Fail Safe Axial inclination control Rotations Optimum biologic response Convenience www.indiandentalacademy.com
  11. 11. 10 mm 2 mm 4 mm BETA (POSTERIOR) SEGMENT 5 mm ALPHA (ANTERIOR) SEGMENT Standard ‘T’ loop (0.017x0.025” TMA) Alpha moment Beta moment ‘T’ loop pre-activated www.indiandentalacademy.com
  12. 12. Neutral position: 0 mm activation 0 gm force Concept of differential moments: activation 6 mm – M:F at anterior seg. 5:1 3 mm deactivation - M:F at anterior seg. 8:1 6 mm deactivation - M:F at anterior seg. 12:1 Interesting to note how the Crot of the canine remains practically constant throughout the retraction www.indiandentalacademy.com
  13. 13. Centered V Bend Intrusive forces=extrusive forces Opposing moments /2 couple system Off-centered V bend Moment greater in the posterior segment reinforces anchorage www.indiandentalacademy.com
  14. 14. 0.017x0.025” TMA/centered T loop Activation: 6 mm F/A = 33 gm/mm 1126 gm-mm 1002 gm-mm 201 gm 168 gm Deactivation: 1 mm M/F=6.0 www.indiandentalacademy.com M/F=5.6
  15. 15. 0.017x0.025” SS/vertical loop Activation: 0.2 mm F/A = 1000 gm/mm 200 gm 0 gm Deactivation: 0.2 mm Clinically impossible !!! www.indiandentalacademy.com
  16. 16. ‘T’ loop has a low load deflection rate of 33 gm per millimeter. An error in activation of 1 mm results in an error of only 33 gm. Extremely forgiving !! As compared to SS, which produces double the Error. Burstone did his home work !! Have you !?! www.indiandentalacademy.com
  17. 17. 6 mm activation M/F=6:1 Tipping 2 mm Deactivation M/F=10:1 Translation 4 mm Deactivation M/F =12:1 Root Movement www.indiandentalacademy.com
  18. 18. FORCE SYSTEM GENERATED BY ‘T’ SPRING FOR INTER-BRACKET DISTANCE OF 25 MM DISPLACEMENT FORCE (GM) 0 1 2 3 4 5 6 7 ANTERIOR M/F (D) POSTERIOR M/F (D) 0 42 85 124 170 216 262 310 0 40 21 15 12 10 9 7.6 0 42 22 16 12 10 9 7.5 www.indiandentalacademy.com
  19. 19. SEGMENTAL CUSPID RETRACTION Minor Cuspid Retraction Favorable root inclination,mild crowding Placing cuspid in class1 relationship www.indiandentalacademy.com
  20. 20. Minor Cuspid retraction Cuspid Retraction > 2mm Controlled tipping M/F = 8:1 Controlled Tip 017x025 TMA ,45Degree bend in beta leg to produce a posterior M/F of 11/1 First order antirotation bends on the legs www.indiandentalacademy.com
  21. 21. The‘ T www.indiandentalacademy.com loop ’
  22. 22. 0.017 x 0.025” TMA wire www.indiandentalacademy.com
  23. 23. www.indiandentalacademy.com
  24. 24. www.indiandentalacademy.com
  25. 25. 5mm www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. 5mm www.indiandentalacademy.com
  28. 28. www.indiandentalacademy.com
  29. 29. 10mm www.indiandentalacademy.com
  30. 30. www.indiandentalacademy.com
  31. 31. 5mm www.indiandentalacademy.com
  32. 32. www.indiandentalacademy.com
  33. 33. 4mm www.indiandentalacademy.com
  34. 34. www.indiandentalacademy.com
  35. 35. 10 mm 2 mm 4 mm BETA (POSTERIOR) SEGMENT 5 mm ALPHA (ANTERIOR) SEGMENT www.indiandentalacademy.com
  36. 36. Pre-activation bends β D = L- A 2 www.indiandentalacademy.com α
  37. 37. www.indiandentalacademy.com
  38. 38. www.indiandentalacademy.com
  39. 39. www.indiandentalacademy.com
  40. 40. www.indiandentalacademy.com
  41. 41. www.indiandentalacademy.com
  42. 42. www.indiandentalacademy.com
  43. 43. www.indiandentalacademy.com
  44. 44. www.indiandentalacademy.com
  45. 45. www.indiandentalacademy.com
  46. 46. www.indiandentalacademy.com
  47. 47. www.indiandentalacademy.com
  48. 48. www.indiandentalacademy.com
  49. 49. β α 1 2 5 6 3 4 www.indiandentalacademy.com
  50. 50. Anti-rotation bends 1 2 www.indiandentalacademy.com
  51. 51. www.indiandentalacademy.com
  52. 52. www.indiandentalacademy.com
  53. 53. www.indiandentalacademy.com
  54. 54. www.indiandentalacademy.com
  55. 55. www.indiandentalacademy.com
  56. 56. www.indiandentalacademy.com
  57. 57. Why bypass mechanics? Unfavorable movement of the incisors -one of the major disadvantages of PEA Need to maintain incisor position Fluctuating forces Multiple forces and moments at each bracket-wire interface www.indiandentalacademy.com
  58. 58. Walking the canine: Normal component of force and frictional resistance Tooth tips until opposing corners contact the wire Wire deflects Moments are generated to upright the tooth www.indiandentalacademy.com
  59. 59. Canine uprighting – couples generated by wire-bracket contact Beware: do not see your patient before 4 wks min. 4 weeks time for uprighting Force required to retract canine = 100 gm + force to overcome frictional resistance (100 gm) 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. www.indiandentalacademy.com
  67. 67. www.indiandentalacademy.com
  68. 68. www.indiandentalacademy.com
  69. 69. www.indiandentalacademy.com
  70. 70. www.indiandentalacademy.com
  71. 71. OSTEOGENIC DISTRACTION OF CANINES: EXCITING PROSPECTS www.indiandentalacademy.com
  72. 72. 6 mm and 11 days – believe it or not !! www.indiandentalacademy.com
  73. 73. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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