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INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
THE TWEED-MERRIFIELD
EDGEWISE APPLIANCE
THE

BRACKETS AND THE TUBES
ARCHWIRES
FIRST,SECOND, AND THIRD ORDER
BENDS
THE AUXILLARIES

www.indiandentalacademy.com
THE EVOLUTION OF THE EDGEWISE
BRACKET
 It

started in 1916, in the form of ribbonarch bracket as devised by Dr.E.H.Angle.
 Although it became very popular at that
time,- deficiencies: It could not control tooth movement in all
three planes.
 Root control was not up to expectations
www.indiandentalacademy.com
 Modify

the bracket – in 1925 – the Edgewise
bracket.
 Slot orientation was changed from vertical to
horizontal,
Rectangular wire oriented 90° to the orientation
it had in the ribbon arch.
 Initially referred to as “open face” or
“tiebracket”.
 Slot – soft gold with a 0.022” x 0.028”.
www.indiandentalacademy.com
The appliance has all the characteristics-

Simplicity
 Efficiency
 Comfort
 Hygienic
 Esthetic


www.indiandentalacademy.com
Neutral 0.022” edgewise slots with double width
brackets on the six anterior teeth, intermediate
single width brackets on premolar teeth, twin
brackets on first molars, 0.022” tubes with mesial
hooks on second molars.
Lingual hooks on molars and lingual cleats on
premolars.
No tips, torque, or any variation in thickness in
bracket or the neutral slot.
www.indiandentalacademy.com
ARCHWIRES
 Resilient

edgewise arch wires
 0.017” x 0.022”, 0.018” x 0.025”, 0.019” x
0.025”, 0.020” x 0.025”, 0.0215” x 0.028”.

www.indiandentalacademy.com
FIRST, SECOND, THIRD ORDER BENDS

FIRST

ORDER BENDS

Affect

expansion or
contraction
SECOND ORDER BENDS
 In mandibular A/w – antagonistic to
anterior teeth
 In maxillary A/w – complementary to the
anterior segment.


www.indiandentalacademy.com
THIRD

ORDER BENDS

Objective – some degree of lingual crown torque in
mandibular teeth & maxillary posterior teeth ; and
some degree of lingual root torque in maxillary
anterior teeth.
Third order bends in mandibular A/W : Incisors: -7°
 -Canines & 1st premolars : -12°
 2nd premolars & molars :- -2°
Third order bends in maxillary A/W :
 Incisors: 0°
 Canines & 1st premolars : -7°
 2nd premolars & molars :- -12°


www.indiandentalacademy.com
AUXILLARIES
 Elastics

and headgear

www.indiandentalacademy.com
Thank you
For more details please visit
www.indiandentalacademy.com

www.indiandentalacademy.com

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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. THE TWEED-MERRIFIELD EDGEWISE APPLIANCE THE BRACKETS AND THE TUBES ARCHWIRES FIRST,SECOND, AND THIRD ORDER BENDS THE AUXILLARIES www.indiandentalacademy.com
  • 3. THE EVOLUTION OF THE EDGEWISE BRACKET  It started in 1916, in the form of ribbonarch bracket as devised by Dr.E.H.Angle.  Although it became very popular at that time,- deficiencies: It could not control tooth movement in all three planes.  Root control was not up to expectations www.indiandentalacademy.com
  • 4.  Modify the bracket – in 1925 – the Edgewise bracket.  Slot orientation was changed from vertical to horizontal, Rectangular wire oriented 90° to the orientation it had in the ribbon arch.  Initially referred to as “open face” or “tiebracket”.  Slot – soft gold with a 0.022” x 0.028”. www.indiandentalacademy.com
  • 5. The appliance has all the characteristics- Simplicity  Efficiency  Comfort  Hygienic  Esthetic  www.indiandentalacademy.com
  • 6. Neutral 0.022” edgewise slots with double width brackets on the six anterior teeth, intermediate single width brackets on premolar teeth, twin brackets on first molars, 0.022” tubes with mesial hooks on second molars. Lingual hooks on molars and lingual cleats on premolars. No tips, torque, or any variation in thickness in bracket or the neutral slot. www.indiandentalacademy.com
  • 7. ARCHWIRES  Resilient edgewise arch wires  0.017” x 0.022”, 0.018” x 0.025”, 0.019” x 0.025”, 0.020” x 0.025”, 0.0215” x 0.028”. www.indiandentalacademy.com
  • 8. FIRST, SECOND, THIRD ORDER BENDS FIRST ORDER BENDS Affect expansion or contraction SECOND ORDER BENDS  In mandibular A/w – antagonistic to anterior teeth  In maxillary A/w – complementary to the anterior segment.  www.indiandentalacademy.com
  • 9. THIRD ORDER BENDS Objective – some degree of lingual crown torque in mandibular teeth & maxillary posterior teeth ; and some degree of lingual root torque in maxillary anterior teeth. Third order bends in mandibular A/W : Incisors: -7°  -Canines & 1st premolars : -12°  2nd premolars & molars :- -2° Third order bends in maxillary A/W :  Incisors: 0°  Canines & 1st premolars : -7°  2nd premolars & molars :- -12°  www.indiandentalacademy.com
  • 11. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com