Welcome to Indian Dental Academy
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
State of the art comprehensive training-Faculty of world wide repute &Very affordable.
2. Introduction
• Orthodontic treatment prior to and after surgical
correction of malocclusion is considered vital to
the stability of the achieved result
• Pre surgical orthodontics helps the oral surgeon
to align the skeletal bases on the operating
table
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3. Review
• Bracket systems
• First generation
Andrews
1972
• Second generation Ronald Roth
1980’s
• Third generation
1990’s
MBT
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4. Slot dimension
• .022 versus .018
• The slot dimension preferred and widely used
by the orthodontist for a surgical case is .022
slot, the stability is better as it allows the use of
stiffer wires.
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6. Tip
• Inbuilt tip VS expressed tip
• Inbuilt tip - The tip built into the bracket
• Expressed tip – on insertion of wire – the
change in the mesio distal inclination of tooth
• The effect of the inbuilt tip and expressed tip on
the mesiodistal inclination of teeth is very
minimal.
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7. Torque
• Inbuilt torque and expressed torque
• loss of torque – cardinal rule
For every 0.001” play there
is loss of 40 loss of torque
PAE is highly inefficient in regaining
lost torque
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12. Bends in the rectangular wire
Palatal root torque on
the anterior and
posterior region
Anterior region – desirable
Posterior region - undesirable
Distal to the www.indiandentalacademy.com root torque
laterals – buccal
14. Decompensation
Skeletal mal- relationship
Teeth compensate to mask the skeletal
discrepancy
Pre- surgical orthodontics
Eliminate the dental compensation that has
occurred with respect to the skeletal base
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15. Class II decompensation
Objectives
Co-ordinate the arches in transverse dimension
Leveling
Class II molar and canine relation ship
Obtain sufficient over jet
Treatment plan
Mechanotherapy
Anchorage preparation
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22. Class III decompensation
• Objectives
– To coordinate the arches in transverse
dimension
– Leveling
– Class III molar and canine relationship
– Reverse overjet&
• Treatment plan
• Mechanotherapy
• Anchorage preparation
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23. Anterior segmental osteotomy
• Objectives
– Coordinate arches in the transverse dimension
– Leveling
– Divergence of roots at the planned osteotomy
site
• Treatment plan
• Mechanotherapy
• Anchorage preparation
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24. Segmental /Continuous
mechanics
• Segmental mechanics are more Bioefficient
with less adverse effects
• Statically determinate system – thus possible
to know the exact amount of forces and
moments in the system
• Though continuous mechanics is a statically
indeterminate system, it has been widely
preferred by the orthodontist due to the easy
cookbook approach.
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25. Creating step at osteotomy site
• Aligning by a segmental approach at the
osteotomy site – most beneficial
• Altering the height of the bracket positioning to
achieve the extrusion of the to be intruded
segment
• Use of a stainless steel or a TMA spring to
create a step at the osteotomy site which TMA
is preferable
– Achieve stabilization of posterior segment with
stainless arch wire
– Insert the spring into the auxiliary tube
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35. Tip
Change in tip alters the mesio distal
diameter occupied
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36. Torque
Space closure
Lower arch the
complete space
closure
achieved
Inability of
complete space
closure in the
upper arch
Loss of torque
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41. Conclusion
• Learn to appreciate the concept of inbuilt tip
and torque versus expressed tip and torque
• Develop individual orthodontic sense instead of
blindly following prescription and bracket
systems
• Having a thorough knowledge of biomechanics
involved will help the orthodontist to supplement
any deficiency present in the system that is
being used
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