iDentistry The Journal September-December 2017 | Page 15

The Journal
Ÿ Load on anchorage is more with preadjusted
appliance system during initial levelling and
alignment stages. Zahed Zahedani et al
compared the severity of apical root resorption
occurring in patients treated with standard
edgewise and pre-adjusted MBT technique.
They found more root resorption in the straight
wire method and less in the standard edgewise
technique that can be attributed to more root
movement in pre-adjusted MBT technique due
to the brackets employed in this method. 5
2. Molar Offset (TOE IN)/TOE OUT bends for
correction of rotated molars : Sometimes in
extraction cases there is mesio lingual rotation
of molars , molar offset with toe in bend is often
required to achieve proper molar positioning.
Similarly in cases where there is distoligual
rotation of molars, toe out bend can be given for
correction. (Fig: 2)
Ÿ Sometimes, manufacturer defects in
preadjusted brackets lead to incorrect
expression of inbuilt features. Wire bending is
required in such cases to compensate for such
inaccuracies.
Ÿ Although preadjusted appliance system has
reduced the need for extensive and time
consuming wire bending but still basic
edgewise mechanics are required to be
incorporated to achieve stable results as the
severity of malocclusions is different in every
patient.
EDGEWISE MECHANOTHERAPY IN
CONTEMPORARY ORTHODONTICS
1. Canine offset for correction of Root
Prominence : Canine offset can be given to
achieve proper positioning of roots in the
cancellous bone before start of space closure.
(Fig:1)
Fig 2
3. 2nd order bends to augment anchorage :
Second order bends can be given to
supplement anchorage , in critical anchorage
cases. Can also be used to upright excessively
tipped posterior teeth. (Fig: 3)
4. Molar tip back bends for anchorage and
uprighting:
Ÿ In second premolar extraction cases, molars
tend to tip mesially during protraction .A tip back
bend can be given mesial to molar.(Fig:4)
Fig 1
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Vol. 13 No. 3
Sep-Dec 2017