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3. 3
Mechanics For Class II Div II
Three treatment
possibilities:
1. Distalizing the
upper arch.
2. Advancing the lower
arch.
3. A reciprocal
movement.
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4. 4
Mechanics For Class II Div II
1. Advancement, torque control, and intrusion
of the upper incisors.
2. Intrusion of the lower incisors and cuspids.
3. Alignment of the buccal segments and Class
II correction.
4. Consolidation of the upper incisors.
5. Idealizing the arches.
6. Finishing.
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6. 6
Mechanics For Class II Div II
1. Advancement, torque control, and intrusion
of the upper incisors.
X Principle of bite before jet
Jet is created followed by intrusion.
16x22 utility arch
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8. 8
Mechanics For Class II Div II
Amount of pressure:
125-160 gms
16 x 22
Stabilization of the
molars:
Quad helix
TPA
Stab. sections
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9. 9
Mechanics For Class II Div II
Intrusion of lower incisors:
16 x 16 utility arch.
65-75 gms.
This is followed by cuspid intrusion.
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10. 10
Mechanics For Class II Div II
Advancement
of the lower
denture:
1. Utility arch
with 4 helical
loops
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11. 11
Mechanics For Class II Div II
2. Using three
vertical loops:
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12. 12
Mechanics For Class II Div II
3. Alignment of the buccal
segment:
a) Stabilizing section
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13. 13
Mechanics For Class II Div II
If buccal segment
are not aligned
―T‖ sections
Twistoflex wire
Cable wire
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14. 14
Mechanics For Class II Div II
4. Consolidation of
the maxillary
incisors:
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15. 15
Mechanics For Class II Div II
Idealization and
arches and finishing
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18. 18
Finishing and Retention
―Begin with the end in
mind‖.
Every orthodontist has a
visual picture in his mind
of the ideal occlusion into
which the teeth should fit
and mesh in the final
finished occlusion.
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19. 19
Finishing and Retention
Bioprogressive proposes the concept
overtreatment….
No clinician can position teeth as delicately as
the functioning incline plane and cusp action
can accomplish naturally when it is
adequately set up to operate correctly.
Allow natural function to guide the teeth into
the best functioning occlusion for each
individual
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21. 21
Finishing and Retention
Two phases of retention:
1. Guiding changes during initial adjustments.
2. Supporting bony sutural and muscular
accommodations to changing environment
and considering long range influences.
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22. 22
Finishing and Retention
Initial stage of retention :
First six weeks following appliance removal
Retainers inserted-designed not to hold but to
guide the teeth in settling.
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23. 23
Finishing and Retention
Labial frame of typical
upper retainer (Ricketts)
passes between the lateral
and cuspid and has a distal
loop at each end to tuck in
the distal of the expanded
overtreated upper cuspid
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24. 24
Finishing and Retention
Lower arch:
Fixed first bicuspid retainer is placed.
-maintain cross arch bicuspid width.
-lower cuspid freedom of adjustment against
upper occlusion.
-maintain lower incisor alignment and rotation
correction.
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25. 25
Finishing and Retention
Stabilizing stage of retention:
First year following active treatment.
Lower retainer is kept in place and upper is
worn most of the time.
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27. 27
Translating orthodontic skills into a bona fide
delivery system is one of the most difficult tasks
faced by clinicians.
The best orthodontic managers are able to
identify the necessary information and leave out
the extraneous.
―After studying many treatment disciplines, I
chose the Bioprogressive approach because it
was flexible‖.
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28. 28
Visual Treatment Objective
Orthodontic movements are more significant
than growth changes
The VTO leads the clinician toward a viable
treatment plan by organizing factors
The superimpositions that define the practical
part of the mechanical procedures
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29. 29
An accurate
measurement of arch
length deficiency—
combined with the
clinician's judgment of
dental and facial
changes required— is
used in the simplified
VTO to produce a
reasonable treatment
goal
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30. 30
Occlusal Paralleling Instrument
Arch length deficiency is
one of the most critical
aspects of diagnosis.
One of the most
accurate measuring
devices is the
mandibular occlusal x-
ray
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31. 31
Diagnostic procedures
Grades the patient as-
A- enthusiastic
B- average
C- resistant
Patient assurance about headgear usage.
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32. 32
Appliance design
End-of-treatment goals should be
dynamic, not based on statistical norms.
This kind of overcorrected result can be called
an ideal orthodontic occlusion— one that will
settle after positioner
treatment, retention, and normal physiologic
rebound into an ideal occlusion and
thereafter into a normal occlusion
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33. 33
Appliance design
1. Type and severity of the original
malocclusion.
2. General approach to mechanics.
3. Size of the final arches.
4. Timing of torque control
5. Bracket placement and design.
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34. 34
Appliance design
Linear Dynamic system designed by the
Ormco 1979.
17-4 grade of stainless steel, which has more
than three times the yield strength of the
standard 303 grade
30% smaller bracket that is stronger than its
full-size counterpart.
20% size reduction in molar region.
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35. 35
Appliance design
The key to a Class I buccal segment is the
proper positioning of the lower first molars
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36. 36
Linear Dynamic System
Ideal orthodontic tooth position.
Anticipated rebound and required
overcorrection.
Appliance design features that
contribute to patient comfort, clinical
simplicity, and optimum utility.
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37. 37
Linear Dynamic System
C.I L.I Canine 1st
pm
2nd
pm
1st
molar
2nd
molar
Max 22/5 14/8 7/10 -7/0 -7/0 -10/0 -10/0
Mand -1/0 -1/0 7/5 -11/0 -17/0 -27/5 -27/5
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38. 38
Basic principles
Treatment of overbite before overjet.
Sectional arch mechanics
Progressive unlocking of malocclusion
Cortical and muscular anchorage
Torque control throughout treatment.
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39. 39
Extraction Therapy
Initiation
Cuspid retraction and uprighting.
Transition and final cuspid space
closure.
Consolidation.
Idealization
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41. 41
Extraction Therapy
Cuspid retraction and uprighting
Angulation of the cuspid
- Mesially tipped-1/3 of the extraction space
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42. 42
Extraction Therapy
Bicuspid and cuspid – initial overlay wire
followed by a simple helical loop.(0.16
NiTi)
Remaining 2/3 – rigid overlay wire.(0.16
Wallaby)
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43. 43
Extraction Therapy
Upper arch
Upper arch-depends on the position of the
incisors
a) Good position-16 x16 vertical closing helical
loop.
b) Need to be engaged at the onset of the
treatment-0.16 round overlay wire.
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44. 44
Extraction Therapy
Traction and final cuspid space closure
Cuspids have almost retracted and bite has
opened sufficiently-traction arches are
placed.(17x 25 NiTi or TMA)
1. Allow final incisor alignment
2. Correct details of the arch form
3. Allow for final root paralleling ,torquing in
cuspid and bicuspid region.
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46. 46
Extraction Therapy
Consolidation
This is done achievement of good arch form.
Lower retraction-1 or 2 month ahead.
-16 square helical continuous
closing arch.
Upper retraction-
- if they are proclined with no torque
requirement -016 round wire
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47. 47
Extraction Therapy
-if in good relation-16 square or 16 x 22
closing loop
-if additional torque is needed –retraction utility
is used.
-if ant intrusion and post extrusion –
combination crossed ―T‖ horizontal closing
loop is used.
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51. 51
Synopsis Non Extraction Therapy
Initiation –
Orthopedic appliances.
Base arches to set up the
anchorage.
Overlay wires.
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52. 52
Synopsis Non Extraction Therapy
Transition
After leveling and
aligning of the arches.
Correct rotation and
spacing
Resilient arches.
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53. 53
Synopsis Non Extraction Therapy
Traction
Lower arch set up –to
allow Class II elastics.
Upper buccal segments
are leveled
Traction sections in
upper arch
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54. 54
Synopsis Non Extraction Therapy
Idealization
Final arches used to
achieve arch
coordination.
Use of light round
wires.
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