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1. TWEED MERRIFIELD
EDGEWISE APPLIANCE
INDIAN DENTAL ACADEMY
Leader in continuing dental education
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2. CONTENTS
The Class II force system
Dental completion
Denture recovery
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3. The class II force system
A new force system of forces
Careful study of cusp relationship
Final diagnostic decision based on
1]ANB relationship
2]Max posterior space analysis
3]patient cooperation
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4. Guidelines 1]ANB less than 5 ,patient is cooperative
max 3rd molar-missing
-present /approaching eruption
 2]ANB of 5-8, Patient is cooperative.
Max 3rd molar normally erupting
 3]ANB greater than 10,patient’s cooperation is
questionable+max 3rd molars are present
 Facial balance and harmony should be
considered before making decision
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5. Orthodontic correction of the ClassII
dental relationship
 Mandibular archwire
-0.0215x0.028 stabilizing archwire
-1st ,2nd ,3rd order bends
-Loop stops 0.5 mm short of molar
tubes
-Gingival spurs distal to lateral
incisors
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6.  Maxillary arch
-0.020x0.025 archwire
-Closed helical bulbous loops
-1st ,2nd order bends.
-Gingival spur distal to 2nd premolar
-Gingival high pull headgear hooks
distal to central incisor
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7.  Class II lay on hooks with
gingival extension distal to
lateral incisor
 Closed helical bulbous loops
opened on each side and
ligated
 8 ounce class II elastics
 Anterior vertical elastics
 High pull headgear
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8.  Force system employed for 1 month.
 Mandibular archwire is removed ,checked and activated
 Activation of max archwire repeated until 2nd molar has
class I
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Second molar distalization

9.  When Class I relationship
of 2nd molar have been established
closed coil spring is compressed
 Elastic chain stretched from
2nd molar to 1st molar.
-Class II elastic
-Anterior vertical elastic
-High pull headgear
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First molar distalization

10.  After 1st molars are moved distally max 2nd premolar is
moved distally followed by max canine
 4 months position the posterior teeth into overcorrected
class I relationship.
.
Second premolar distalization
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Canine distalization

11.  0.020x0.025 max archwire with
7 mm closing loops +order
bends +gingival hooks
 Closing loop opened +mild
Class II+anterior vertical elastic
+High pull headgear
 Maxillary space is closed
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12. Denture completion
 Order bends placed in
0.0215x0.028 archwire.
 Mandibular archwire duplicates
anchorage preparation
archwire
 Maxillary archwire with artistic
bends and hooks for headgear
,vertical and class II elastics.
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13.  Forces are based on arrangement of each tooth, relation
of one arch to other and relationship of arches to the
environment .
 Progress ceph and tracing evaluated to determine mand
incisor position, minor control of planes lingual root
torque in max incisors.
 Visual observations permit evaluation of lip line ,max
incisor relationship, amount of cusp seating and artistic
positioning of incisors.
 This step is considered as mini treatment of
malocclusion .
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14.  Characteristics observed at end of the stage of
treatment
 1]incisors aligned
 2]occlusion overtreated
 3]anterior teeth in edge to edge
 4]max canine and 2nd premolar in class I
 5]max 1st molar mb cusp in mb groove of man
1st molar
 6]distal cusp of 1st molar and 2nd molar out of
occlusion
 7]all spaces closed tightly
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15. DENTURE RECOVERY
 Ideal result after all mechanics are discontinued
and uninhibited function and other
environmental influences stabilize and finalize
the position of dentition.
 Forces involved are of muscles and
periodontium
 Certain tooth and denture changes tend to revert
toward their original position .

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16.  Tweed occlusion or transitional occlusion
characterized by disclusion of 2nd molars and
distal cusps of 1st molars.
 It allows muscles of mastication to effect the
greatest force on the primary chewing table in
midarch area.
 Class I and class II deep-bite patients -anterior
teeth positioned in an end-to-end relationship
Transitional occlusion
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17. The muscles of swallowing expression
,and mastication involved in determining
final stable ,esthetic relationship of the
teeth –functional occlusion
Final occlusion
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18. Thank you
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