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www.indiandentalacademy.com
First order bends:- In and Out bends
Bucco-lingual / Labio-lingual
and Rotational movement.
Second order bends:- Tip bends
Mesio-distal movements.
Third order bends:- Torque
www.indiandentalacademy.com
 Purpose:- To contour the arch wire to the buccal
surfaces of teeth, which vary in their labio-lingual
thickness and do not conform to an arch.
 The extent of each bends is dictated by the labio-
lingual thickness of individual teeth so that a smooth
curve of incisors and canines on their lingual surface
can be achieved.
www.indiandentalacademy.com
www.indiandentalacademy.com
Co-ordinated upper and lower arch wire with first
order bends.
First order bends are-
Lateral inset
Canine eminence
Molar offset
Antirotation bend
 First order bends also helps for derotation
(Molar offset)
 First order bend in between pre-molar and molar is
also known as anti-rotation or toe-in bend and the size
vary from individuals to individual.
 First order bends in the maxillary and mandibular
arch must be co-ordinated.
www.indiandentalacademy.com
 In pre-adjusted edgewise appliance system, first
order bends are built in the bracket bases and buccal
tube base.
 However these may have to be bent depending on
individual requirements of a malocclusion or while
finishing .
www.indiandentalacademy.com
 Bends in the occluso-gingival direction to maintain the
final angulation of teeth.
 In the incisal area, second order bends (artistic bends)
provide the ideal angulation to these teeth.
 In posterior region, second order bends maintain the
distal tipping of the pre-molars and molars and cause
bite opening (pseudo bite opening).
www.indiandentalacademy.com
 To differentiate between anterior and posterior
segment.
 To give separate anterior and posterior root torque.
 For soldering attachments.
www.indiandentalacademy.com
Second order bends Upper wire
www.indiandentalacademy.com
 An intrusive force for bite opening is also produced
in the anterior segment which is accompanied by a
labial crown torque.
 Labial crown torque is controlled by Class II Elastics
in the Upper arch and in lower arch with tie back
molar
www.indiandentalacademy.com
In pre-adjusted edgewise system, second order effects
(tip) are incorporated in the bracket slot but may be
useful in some cases to achieve better finish in terms
of angulation of teeth.
www.indiandentalacademy.com
 Exaggerated second order bends are known as tip
back bends and are used for anchorage
preparation.
www.indiandentalacademy.com
Types of second order bends:-
 Short second order bends
 Long second order bends
 Step Up Bends, Step Down: V Bends
 Tip Bends
 Artistic Positioning bends, Long V Bend
www.indiandentalacademy.com
 Second order Tip-back bends are utilized to prepare
anchorage.
 The degree of tip-back on the terminal molars should
be such that when the arch wire is placed in the
buccal tubes it will cross the cuspid teeth at their
dento-enamel junctions.
www.indiandentalacademy.com
After placing the arch wire in the molar tubes of the
terminal molars when it is raised and ligated to the two
brackets on the first molar teeth, the mesial cusps of the
terminal molars are elevated and the first molars are
depressed. At this point the arch wire will lie gingival to
the brackets on the second pre-molar teeth.
www.indiandentalacademy.com
When the arch wire is placed in the slots of the second
pre-molar brackets, first molars are elevated and the
second premolars are depressed. Thus the force
necessary to tip the terminal molars transferred to the
second premolar teeth. Now the arch wire lies
gingival to the first premolar brackets.
www.indiandentalacademy.com
When the arch wire ligated to the first premolar brackets,
first premolars depressed and second premolars are
elevated. Thus terminal molars are being tipped distally
at the expense of depressing the first premolar teeth.
Now arch wire lies gingival to the canine brackets.
www.indiandentalacademy.com
When canines are engaged, the canines are depressed
and the first premolars are elevated. Thus all the distal
tipping forces on premolars and molars are neutralized
by the depressing force on the canines. This depression is
neither too rapid as it has very large root with well
supported alveolar bone. Now arch wire lies gingival to
the incisors brackets.
www.indiandentalacademy.com
When arch wire ligated to the incisors brackets, the
action is elevation of the canines and depression of the
incisors. These teeth are too small and depressed very
rapidly.
www.indiandentalacademy.com
 As the canine and incisors brackets slots are in same
level, the cuspid and both incisors reacts as single unit
to resist the depressing action of the distal tipping of
the terminal molars.
 At this time there is alteration of the occlusal plane. It
has dropped down in its anterior quadrant.
 If no force other than those within the arch wires are
utilized and if the arch wires are left in the mouth for a
long period of time, the end result will be bite opening
and this is not desirable.
www.indiandentalacademy.com
The alteration of occlusal plane is however can be
maintained by the anterior box elastics.
By doing this, the roots of the mand. buccal quadrants
displace mesially without much distal tipping of the
crowns.
This is because the second order bends remain as second
order bends rather than becoming step down bends if the
mand. occlusal plane is not allowed to drop down
anteriorly.
www.indiandentalacademy.com
However, when Class-III elastics are applied along with
anterior box elastics the crowns of the mand. Buccal
segment tipped distally to the desired degree of
anchorage preparation with minimum amount of mesial
root displacement.
www.indiandentalacademy.com
Class-III elastics are applied while preparing the
mand. Anchorage and to counteract the mesial
force of the elastics , intermediate pull head hear
has to be worn in the maxillary arch.
If second order bends are placed in the maxillary arch
without Class-II elastics, the uncontrolled forces move
the root apices of the teeth in the buccal segment in
mesial direction without distal movement of the
crown. In such instances it will leads to mesial
displacement of the teeth in the buccal quadrants of
both arches resulting bimaxillary protrusion.
www.indiandentalacademy.com
 Torsional bends along the long axis of the rectangular
arch wire are called third order bends or torque.
 Basically two types of torque depending on the type
of tooth movement:-
 Buccal (Labial) / Palatal (Lingual) root torque.
 Buccal (Labial) / Palatal (Lingual) crown torque
www.indiandentalacademy.com
Torque may be:-
* Passive or active torque.
* Continuous or progressive torque.
www.indiandentalacademy.com
Continuous torque is recommended in the
mandibular incisor region where as progressive
torque is recommended in the posterior region.
Active torque
 Torque in an arch wire is said to be active when it is
capable of affecting a torque movement of teeth in a
segment.
Passive torque
 A passive torque in an arch wire is said to be present
when the torque in it does NOT produce torque
movement on full engagement of the wire. The purpose
of the passive torque is to maintain the already
achieved torque.
www.indiandentalacademy.com
In pre-adjusted edgewise appliance system, torque
values are built-in in the brackets. However, a variation
of torque in a segment or for an individual tooth may
required for proper finishing the case .
www.indiandentalacademy.com
www.indiandentalacademy.com
Thank you
For more details please visit
www.indiandentalacademy.com

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1ST, 2ND AND 3RD ORDER BENDS IN STANDARD EDGEWISE APPLIANCE SYSTEM /Fixed orthodontics courses in india

  • 2. First order bends:- In and Out bends Bucco-lingual / Labio-lingual and Rotational movement. Second order bends:- Tip bends Mesio-distal movements. Third order bends:- Torque www.indiandentalacademy.com
  • 3.  Purpose:- To contour the arch wire to the buccal surfaces of teeth, which vary in their labio-lingual thickness and do not conform to an arch.  The extent of each bends is dictated by the labio- lingual thickness of individual teeth so that a smooth curve of incisors and canines on their lingual surface can be achieved. www.indiandentalacademy.com
  • 4. www.indiandentalacademy.com Co-ordinated upper and lower arch wire with first order bends. First order bends are- Lateral inset Canine eminence Molar offset Antirotation bend
  • 5.  First order bends also helps for derotation (Molar offset)  First order bend in between pre-molar and molar is also known as anti-rotation or toe-in bend and the size vary from individuals to individual.  First order bends in the maxillary and mandibular arch must be co-ordinated. www.indiandentalacademy.com
  • 6.  In pre-adjusted edgewise appliance system, first order bends are built in the bracket bases and buccal tube base.  However these may have to be bent depending on individual requirements of a malocclusion or while finishing . www.indiandentalacademy.com
  • 7.  Bends in the occluso-gingival direction to maintain the final angulation of teeth.  In the incisal area, second order bends (artistic bends) provide the ideal angulation to these teeth.  In posterior region, second order bends maintain the distal tipping of the pre-molars and molars and cause bite opening (pseudo bite opening). www.indiandentalacademy.com
  • 8.  To differentiate between anterior and posterior segment.  To give separate anterior and posterior root torque.  For soldering attachments. www.indiandentalacademy.com
  • 9. Second order bends Upper wire www.indiandentalacademy.com
  • 10.  An intrusive force for bite opening is also produced in the anterior segment which is accompanied by a labial crown torque.  Labial crown torque is controlled by Class II Elastics in the Upper arch and in lower arch with tie back molar www.indiandentalacademy.com
  • 11. In pre-adjusted edgewise system, second order effects (tip) are incorporated in the bracket slot but may be useful in some cases to achieve better finish in terms of angulation of teeth. www.indiandentalacademy.com
  • 12.  Exaggerated second order bends are known as tip back bends and are used for anchorage preparation. www.indiandentalacademy.com
  • 13. Types of second order bends:-  Short second order bends  Long second order bends  Step Up Bends, Step Down: V Bends  Tip Bends  Artistic Positioning bends, Long V Bend www.indiandentalacademy.com
  • 14.  Second order Tip-back bends are utilized to prepare anchorage.  The degree of tip-back on the terminal molars should be such that when the arch wire is placed in the buccal tubes it will cross the cuspid teeth at their dento-enamel junctions. www.indiandentalacademy.com
  • 15. After placing the arch wire in the molar tubes of the terminal molars when it is raised and ligated to the two brackets on the first molar teeth, the mesial cusps of the terminal molars are elevated and the first molars are depressed. At this point the arch wire will lie gingival to the brackets on the second pre-molar teeth. www.indiandentalacademy.com
  • 16. When the arch wire is placed in the slots of the second pre-molar brackets, first molars are elevated and the second premolars are depressed. Thus the force necessary to tip the terminal molars transferred to the second premolar teeth. Now the arch wire lies gingival to the first premolar brackets. www.indiandentalacademy.com
  • 17. When the arch wire ligated to the first premolar brackets, first premolars depressed and second premolars are elevated. Thus terminal molars are being tipped distally at the expense of depressing the first premolar teeth. Now arch wire lies gingival to the canine brackets. www.indiandentalacademy.com
  • 18. When canines are engaged, the canines are depressed and the first premolars are elevated. Thus all the distal tipping forces on premolars and molars are neutralized by the depressing force on the canines. This depression is neither too rapid as it has very large root with well supported alveolar bone. Now arch wire lies gingival to the incisors brackets. www.indiandentalacademy.com
  • 19. When arch wire ligated to the incisors brackets, the action is elevation of the canines and depression of the incisors. These teeth are too small and depressed very rapidly. www.indiandentalacademy.com
  • 20.  As the canine and incisors brackets slots are in same level, the cuspid and both incisors reacts as single unit to resist the depressing action of the distal tipping of the terminal molars.  At this time there is alteration of the occlusal plane. It has dropped down in its anterior quadrant.  If no force other than those within the arch wires are utilized and if the arch wires are left in the mouth for a long period of time, the end result will be bite opening and this is not desirable. www.indiandentalacademy.com
  • 21. The alteration of occlusal plane is however can be maintained by the anterior box elastics. By doing this, the roots of the mand. buccal quadrants displace mesially without much distal tipping of the crowns. This is because the second order bends remain as second order bends rather than becoming step down bends if the mand. occlusal plane is not allowed to drop down anteriorly. www.indiandentalacademy.com
  • 22. However, when Class-III elastics are applied along with anterior box elastics the crowns of the mand. Buccal segment tipped distally to the desired degree of anchorage preparation with minimum amount of mesial root displacement. www.indiandentalacademy.com Class-III elastics are applied while preparing the mand. Anchorage and to counteract the mesial force of the elastics , intermediate pull head hear has to be worn in the maxillary arch.
  • 23. If second order bends are placed in the maxillary arch without Class-II elastics, the uncontrolled forces move the root apices of the teeth in the buccal segment in mesial direction without distal movement of the crown. In such instances it will leads to mesial displacement of the teeth in the buccal quadrants of both arches resulting bimaxillary protrusion. www.indiandentalacademy.com
  • 24.  Torsional bends along the long axis of the rectangular arch wire are called third order bends or torque.  Basically two types of torque depending on the type of tooth movement:-  Buccal (Labial) / Palatal (Lingual) root torque.  Buccal (Labial) / Palatal (Lingual) crown torque www.indiandentalacademy.com
  • 25. Torque may be:- * Passive or active torque. * Continuous or progressive torque. www.indiandentalacademy.com Continuous torque is recommended in the mandibular incisor region where as progressive torque is recommended in the posterior region.
  • 26. Active torque  Torque in an arch wire is said to be active when it is capable of affecting a torque movement of teeth in a segment. Passive torque  A passive torque in an arch wire is said to be present when the torque in it does NOT produce torque movement on full engagement of the wire. The purpose of the passive torque is to maintain the already achieved torque. www.indiandentalacademy.com
  • 27. In pre-adjusted edgewise appliance system, torque values are built-in in the brackets. However, a variation of torque in a segment or for an individual tooth may required for proper finishing the case . www.indiandentalacademy.com
  • 28. www.indiandentalacademy.com Thank you For more details please visit www.indiandentalacademy.com