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A treatment method for orthodontic /certified fixed orthodontic courses by Indian dental academy
1. INDIAN DENTAL ACADEMY
Leader in continuing dental education
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2. Class II Correction
• Headgears/ Class II elastics –Patient Compliance
• Implants becoming popular
• Xtn of First molars – Williams (1976)
• Williams R. Single arch extraction—upper first molars or what to do
when nonextraction treatment fails. Am J Orthod 1979;76:376–393.
• Williams R, Hosila FJ. The effect of different extraction sites upon incisor
retraction. Am J Orthod 1976;69:388–410.
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3. Technique
• 3 stages
– Class II Correction
– Space Closure & Torque
– Detailing & Finishing
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5. Maxilla
• The second molars are banded -7-mm buccal tubes and palatal
sheaths – palatal bar
– increase anchorage
– correct eventual rotations and transversal malpositions
• Extraction of First Molar – healing period of three weeks
• Low-friction brackets - Begg light wire brackets
• Maxillary premolars not bonded
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7. The Archwire
• 0.016-in premium plus pull straightened Australian wire (Wilcock,
Whittlesea, Australia)
• If the maxillary anterior teeth cannot easily be attached to the
archwire, this is completed after space is created by distal
movement of the maxillary canines
• Anchor bends – 5mm mesial of the second molar tubes prevents
mesial tipping of these teeth
• degree of bends depends on the desired amount of bite opening
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8. • canines are fixed with stainless steel high hat lock pins
• occlusal part - partially bent mesially - hook for the
horizontal elastics (5/16 in, 2.6 oz),
• attached - buccal hooks on the maxillary second molar bands
• patient is instructed to replace the elastics only once per
week
• elastics should run inside the anchor bends in the main arch
– prevent irritation to gingiva
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9. If second molars move too quickly
• horizontal elastics - replaced by Class II elastics (5/16 in,
2.6o)
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10. Completion of Class II correction; a Class I
canine and premolar inter-digitation is realized
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11. Phase II : Space Closure & Torque
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12. • modified with offset bends, anchor bends, and vertical
offsets between second molars and second premolars
• Depending on the required bite opening, v-bends between
both premolars and premolars and canines are added
• alignment of the maxillary premolars takes approximately
one month, after which the 0.016-in archwire is replaced by
a 0.018-in premium plus archwire
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13. Individual adjustments
• to correct the relation of maxillary central and lateral
incisors in conjunction with the smile line - form of the
maxillary arch is adapted to the form of the original arch
• An individual two-spur torque auxilliary of 0.014-in regular
wire (Wilcock, Whittlesea, Australia) ending distally of the
maxillary canine brackets is applied
• Aside from the torque effect, this spring has the tendency to
protrude the maxillary anterior teeth.
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14. • adverse effect is eliminated by horizontal traction in the
lateral regions
• If extensive torque is required and rest spaces are small, the
palatal bar between the maxillary second molars is
maintained. In the opposite situation, the bar is temporarily
removed.
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15. Beginning of space closure and torque; the
maxillary premolars are bonded and the
maxillary 0.016-in archwire is adjusted.
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16. • If extensive torque is required and rest spaces are small, the
palatal bar between the maxillary second molars is
maintained
• In the opposite situation, the bar is temporarily removed
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17. A 0.018-in maxillary archwire in combination
with a 0.014-in torquing auxilliary, uprighting
and horizontal tractions; the palatal bar can be
temporarily removed
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18. • The patients are seen at intervals of six to eight weeks
• The closing of the lateral spaces and torque action must be
balanced
• Orthodontists have to observe the progress and decide
about individual adaptations in the use of horizontal
tractions, uprighting springs, and eventual wear of Class II
elastics.
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19. Mandible
• In case of the eventual wear of Class II elastics, the
mandibular archwire shape is expanded to compensate for
lingual tipping of the mandibular molars
• When indicated, individual uprighting springs are placed in
the vertical slots
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20. Phase III : Detailing & Finishing
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21. • In the final phase of treatment, adjustments are made in the
archwires for detailed finishing and the palatal bar is
reinserted when indicated
• Each tooth can be uprighted independently by placement of
springs, taking into account the adverse effects of the
uprighting springs that all point into the same direction and
causing a mesial directed tendency
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23. Retention
• means of fixed retainers
• To prevent vereruption of the mandibular second molars,
local retention wires are bonded buccally between the
mandibular first and second molars
• These sectionals are removed when the maxillary third
molars are in occlusal contact with the mandibular second
molars
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24. The bonded wire between the mandibular first and
second molars is removed after settling in of the
maxillary third molar.
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26. Beginning of Class II correction after extraction
of the maxillary first molars
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27. Beginning of space closure and torque; the
maxillary premolars are bonded, and the
maxillary 0.016-in archwire is adjusted
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28. A 0.018-in maxillary archwire with a 0.014-in
torquing auxilliary
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32. Conclusion
Extraction of maxillary first molars, followed by fixed
appliance treatment with low-friction brackets with thin
round wires and a palatal bar, is an effective and efficient
treatment modality for Class II Division 1 malocclusions,
especially for less compliant patients.
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