This document provides an overview and summary of an upcoming seminar on orthodontic treatment mechanics. It discusses: 1. The history and evolution of different orthodontic bracket systems including Roth, McLaughlin-Bennett, and MBT systems. 2. Key aspects of the popular MBT bracket system including bracket selection, versatility, accuracy of positioning, light continuous forces, 0.022 vs 0.018 slot sizes, and anchorage control. 3. Other topics to be covered include group tooth movement techniques, use of different archwire forms, ligation methods, and a case review demonstrating treatment with the MBT system. The document concludes by noting the seminar will continue in Part

1. 1
Dr. Manoranjan Mahakur
1st year PGT
Department of Pedodontics & Preventive Dentistry,
SCB Dental College & Hospital , Cuttack -7, Odisha.

4. WELCOME TO PEDO FAMILY

5. “Orthodontics biomechanics is not just a theoretical subject-
it is the core of clinical practice”
“Innovation may come and go;
their basis is not going to change radically”

6. 1. A brief history… the overview of treatment mechanics
2. Appliance… the variation and versatility
3. Bracket…the positioning and case set up
4. Arch…. the form and selection
5. Anchorage control… the tips and trick
6. Arch leveling and overbite control
7. Class II treatment…the over view
8. Class III treatment…the over view
9.Space closure…the secrets
10.Finishing…. the ultimate
11. Retention protocols ..the conclusion
content

7. FUNDAMENTAL OF ORTHODONTICS
TREATMENT MECHANISM
Bracket Selection
Bracket
Positioning
Force Level
Arch wire
Selection
FOT
Systematize orthodontic treatment mechanics
McLaughlin.Bennett.Trevisi

8. THE WORK OF ANDREW
Wide Range Of Bracket
Bracket at the centre of
crown
Heavy Force
Various Arch Form
Straight Wire
Appliance

9. DRAW BACK
• Roller coaster effect …..

10. The work of ROTH
ROTH BRACKET
Bracket at centre of
clinical crown
Emphasis on articulator STANDARD WIDE arch
form
ROTH

11. Work of McLAUGHLIN & BENNETT
1975-93
•
Standard
SWA BRACKET
Bracket positioned at the
centre of clinical crown
Light force levels and
sliding mechanics
OVOID ARCH WIRE
Mc & Bennett

12. WORK OF MBT 1993-97
New Range Of
MBT Bracket
Bracket Positioned With
The Help Of Gauge
Light Force Levels
Sliding Mechanics
Ovoid Arch Wire
Mc & Bennett
&Trevisi

13. WORK OF MBT up to 2001
New Range Of
MBT Bracket
Bracket Positioned With
The Help Of Gauge
Light Force Levels
Sliding Mechanics
Ovoid ,tapered and square
Arch Wire
Mc & Bennett
&Trevisi

14. WHICH BRACKET SYSTEM IS BEST??

15. Which Bracket System is Best to use?

16. Modification of MBT bracket system

17. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

18. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

19. BRACKET
SELECTION
High quality bracket
–gives consistent
performance ,
good finishing

20. Bracket shape
SWA
MBT

21. BRACKETS PARTS

22. DESIGN OF
BRACKETS

23. TORQUE IN THE BRACKET

24. TIP IN THE BRACKET

29. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

30. What should be the bracket prescription ????

31. VERSATILITY OF THE “MBT” BRACKET
SYSTEM
1. Option for palatally displaced upper lateral
incisor (-10 degree)
2. Three torque option for upper canine (-7,0,+7
degree)
3. Three torque option for lower canine (-6,0,+6
degree)
4. Interchangeable lower anterior bracket (same
tip and t)
5. Interchangeable upper premolar bracket (same
tip and t)

32. SELECTION OF THREE TORQUE CANINE BRACKET
square
Tapered
Tapered
Ovoid
Ovoid
square

33. SELECTION OF THREE TORQUE CANINE BRACKET
U+7, L+6
BOTH 0 Degree

34. SELECTION OF THREE TORQUE CANINE BRACKET
Extraction decision (Tip control)= 0 degree torque both
u/l
Class II/2 case = lower canine 0 or + 6 degree
Rapid palatal expansion cases= lower canine 0 or + 6
degree
Agenesis of upper lateral incisor where space to be
closed = Upper canine + 7 degree
Systematize orthodontic treatment mechanics
McLaughlin.Bennett.Trevisi .

35. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

36. Accuracy of bracket positioning

37. Accuracy of bracket positioning

38. Accuracy of bracket positioning

39. Accuracy of bracket positioning

40. Accuracy of bracket positioning

41. Bracket positioning Chat

42. Bracket positioning Chat

43. Special case bracket positioning
FOR DEEP BITE – incisor and canine brackets
0.5 mm more Occlusally
OPEN BITE- 0.5 mm more gingivally

44. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

45. LIGHT CONTINUOUS FORCE
Light force < 200gm
Heavy force >600 (tissue blanching, patients
discomfort,unwanted movement ).
Early thin flexible wire with Minimal deflection
Avoid too frequent arch wire change
Active tieback ,Sliding mechanics =
0.019/0.025 steel wire

46. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

47. • Preadjusted appliance perform best in .022
• Large slot more freedom= light force
• Steel rectangular wire .019/.025 perform well
THE .022 Vs THE .018 SLOT

49. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. One size of rectangular steel wire
x. Methods of arch ligation

50. Anchorage control early in treatment
• MBT Reduced tip and Increased torque of
anterior bracket
• Laceback – used to assist control of canine
crown in premolar extraction cases
• Bendback-used in most cases except to
increase arch length , prevent mesial
movement of anterior teeth.
• It is continued throughout tooth leveling and
alinging until rectangular steel arch wire stage

51. Anchorage control early in treatment
CANINE LACEBECK
BENDBECK

52. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

53. GROUP MOVEMENT with LOOP
BY TWEED
Lot of wire bending time
Heavy force
Poor sliding mechanics
Short range of activation

54. GROUP MOVEMENT with ELASTIC
DISADVANTAGE
ELASTIC from molar to molar force =
maxilla 400gm
mandible 350 gm

55. A GLIMSE TO ORTHODONTIC ELASTIC

57. Force level of different elastic

58. GROUP MOVEMENT
with sliding mechanics
TIEBECK

59. Alternative Mechanics
HYCON device from edenta

60. GROUP MOVEMENT with SPRING
Large space
Infrequent adjustment opportunities
The optimal force for space closure is 150gm
 with NiTi coil spring.
344-150,346-150 3M Unitek spring give a force of 150gm
Spring shouldn't be expanded beyond the manufacture
recommendation (22mm for 9mm spring,or 36 mm for 12 mm spring)
Samuels et al .
Close spring

61. OPEN SPRING

62. Obstacles To Space Closure

63. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

64. THE USE OF THREE ARCH FORM
Tapered form Square form Ovoid form
Narrowest inter
canine width.
 Gingival
recession .
 Single arch
treatment
-Broad arch form.
 Buccal up righting
of the lower
posterior teeth.
 Expansion of the
upper arch
Most of the cases

65. How to Stock a arch wire ???
Initial leveling and alinging – Ovoid Muiltistrand.015
or HANT .016
 Early treatment- All round wire should be stocked
in ovoid form.
Rectangular NITI- Stocked in Tapered(45%),Ovoid(45%)
,Square (10%)
Rectangular SS wire- Stocked in ovoid only ,
modified to patients IAF form
SS wire can be customize to individual arch form (IAF)
using the clear template.
Systematize orthodontic treatment mechanics
McLaughlin.Bennett.Trevisi .

66. How to make a template for
Individual Arch Form (IAF)

68. Over view of MBT treatment
i. Bracket selection
ii. Versatility of the bracket system
iii. Accuracy of Bracket positioning
iv. Light continuous force
v. 0.022 vs 0.018 slot
vi. Anchorage control early in the treatment
vii. Group movement
viii.The use of three arch forms
ix. Methods of arch ligation

69. METHOD OF ARCHWIRE LIGATION

70. FIGURE 8 LIGATION

71. A CASE REVIEW

72. 15.5 YRS
Narrow facial
appearance
Mandibular
asymmetry to left

73. Class I molar relation
Mild crowding on
upper and lower arch

74. Retrocline lower incisor

75. Narrow and tapered
arch form
Impacted 3rd molar

76. .022 Bracket
Inverted canine bracket
(U +7 , L 6+)
 .016 HANT wire
Ovoid arch form

77. .019/ .025 Rectangular HANT wire.
Tapered arch form
Torqueing and up righting the buccal
segment.
Provide space for anterior alignment
Good canine control

78. .019/.025 rectangular
SS wire ,
Tapered
Soldered hooks

80. Enamel reshaping of incisal edge of 11
Repositioning of bracket
Re-leveling and alinging using .014 SS wire
Lower arch with .016 HANT

81. Pleasing dental result achieved
Good canine crown and
root position

82. Lower bonded retainer
Upper Removable retainer

83. BEFORE AFTER

84. BEFORE
AFTER

85. INDIRECT BRACKET BONDING

86. 86
“ I will remember that I remain a member of society,
with special obligations to all my fellow human
beings, those sound of mind and body as well as the
infirm.”
( Hippocratic oath line 8)
Upcoming seminar…….
Part 2 To be continued.....