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

www.indiandentalacademy.com
LABIAL BOWS
• Labial bow is an essential component of
removable orthodontic appliances

• It can be either active or passive

www.indiandentalacademy.com
• The principal function of the bow is to

retrude the anterior teeth
• It can be used for retentive purposes

www.indiandentalacademy.com
Parts of labial bow
•
•
•
•

The incisor segment
Vertical loops
The occlusal or cross
over section
The retentive ends

www.indiandentalacademy.com
Placement of the incisor segment
• Active bow

placed at the junction of incisal and
middle third

• 0.6 or 0.7 mm SS Wire used

www.indiandentalacademy.com
• Retentive or passive bow

placed at the junction of cervical and
middle third or below the height of
contour

• 0.9 or 1 mm SS Wire used

www.indiandentalacademy.com
Types
•
•
•
•
•
•
•
•
•

Short labial bow
Long labial bow
Roberts retractor
Reverse labial bow
Begg’s labial bow
Mills retractor
Fitted labial bow
High labial bow with apron springs
Split labial bow
www.indiandentalacademy.com
Short labial bow
Indications
• Retraction of anteriors
• Anterior spacing with proclination
• Overjet reduction
There should be good contact between
canine and premolar

www.indiandentalacademy.com
• 0.7mm wire used
• Fabrication:- labial segment of wire is

placed at the junction of the incisal and
middle third.

www.indiandentalacademy.com
Vertical segment starts from mesial third of canine,
should be perpendicular to the incisor segment &
should be away from gingiva
Occlusally, it passes between canine and premolar

www.indiandentalacademy.com
Retentive ends adapted on the lingual or palatal
side.
Activation - Compressing the U-loop by 1mm

www.indiandentalacademy.com
Long labial bow
Indications
• Anterior space closure
• Overjet reduction
• Closure of the space distal to the canine
• As a retaining device at the end of fixed
therapy
• Guidance of canine during canine
retraction using palatal retractor
www.indiandentalacademy.com
•
•
•

0.7 mm wire used in active purpose
0.9 mm wire used in passive purpose
Fabrication - same as short labial bow but
occlusal wire passes between two
premolars
• Activated by compressing the U-loop

www.indiandentalacademy.com
Roberts retractor
• It was first designed by G.H Robert
• Indication

it is suitable only for retraction of four
incisors following retraction of canines

www.indiandentalacademy.com
• This is a flexible bow which is constructed
from 0.5 or 0.6 mm wire inserted into a
stainless steel tubing to give support to
either end of the bow

www.indiandentalacademy.com
• Fabrication

Labial segment of wire is placed at the junction of
the incisal and middle third
Extends only two thirds of the mesiodistal width of
the lateral incisors
A coil of 3mm internal diameter placed mesial to
canine
Distal part is supported in a stainless steel tubing

www.indiandentalacademy.com
• It is activated by closing the coil or giving palatal
bend at the emergence of the coil

www.indiandentalacademy.com
Reverse labial bow
• Indication

For retaining tooth positions
For minor tooth movements

www.indiandentalacademy.com
• 0.7 mm wire used
• Fabrication:-loops are placed distal to

the canine and the free ends of the Uloops are adapted occlusally between
the premolar and canine

www.indiandentalacademy.com
• This is too stiff for effective incisor retraction
• The stability ratio is poor

Activation
First the U-loop is opened this results in
lowering of the labial bow in the incisor region .
A compensatory bend is given at the base of
the loop

www.indiandentalacademy.com
Begg’s labial bow

(Wrap Around / Around the Globe Bow)
• Popularized by P.R . Begg
• It is used as retainer after fixed orthodontic
therapy
• 0.9 mm wire is used

www.indiandentalacademy.com
• Fabrication

consists of labial wire that extends till the last
erupted molar
U-loop is incorporated at the pre molar and molar
area to close the band spaces

www.indiandentalacademy.com
• Advantage of this bow is that there is no

cross- over wire between the canine and
premolar there by eliminating the risk of
space opening up

www.indiandentalacademy.com
Mills retractor
• It is also called extended labial bow
• Indication
Large overjet
For alignment of irregular incisors

www.indiandentalacademy.com
• 0.7 mm wire is used
• This labial bow has an extensive looping of the
•
•

wire so as to increase the flexibility and range of
action
Poor patient acceptance
Complex design

www.indiandentalacademy.com
Fitted labial bow
• Used to secure the incisors firmly after they been
•
•
•

rotated
It acts as retainer
It is not used in active tooth movement
0.7 mm wire is used

www.indiandentalacademy.com
High labial bow with apron spring
•
•
•
•
•

Used in retraction of one or more teeth
Large overjet
It is very similar to a Roberts retractor
Highly flexible
Light force

www.indiandentalacademy.com
• Fabrication

A heavy base arch of 0.9mm to 1mm wire extends
into the buccal sulcus
apron spring made of 0.4mm wire is attached to
the high labial bow

www.indiandentalacademy.com
• Activation

It is activated by bending the upright arms of the
apron springs towards the teeth
3mm activation at a time
Disadvantages are difficulty in construction and soft
tissue injury

www.indiandentalacademy.com
Split labial bow
• Used for anterior
•

retraction
Closer of midline
diastema

www.indiandentalacademy.com
Other bows
• Protrusion bow
• Palatal arch with central U-loop

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

www.indiandentalacademy.com

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labial Bows /certified fixed orthodontic courses by Indian dental academy

  • 1. BOW S INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. LABIAL BOWS • Labial bow is an essential component of removable orthodontic appliances • It can be either active or passive www.indiandentalacademy.com
  • 3. • The principal function of the bow is to retrude the anterior teeth • It can be used for retentive purposes www.indiandentalacademy.com
  • 4. Parts of labial bow • • • • The incisor segment Vertical loops The occlusal or cross over section The retentive ends www.indiandentalacademy.com
  • 5. Placement of the incisor segment • Active bow placed at the junction of incisal and middle third • 0.6 or 0.7 mm SS Wire used www.indiandentalacademy.com
  • 6. • Retentive or passive bow placed at the junction of cervical and middle third or below the height of contour • 0.9 or 1 mm SS Wire used www.indiandentalacademy.com
  • 7. Types • • • • • • • • • Short labial bow Long labial bow Roberts retractor Reverse labial bow Begg’s labial bow Mills retractor Fitted labial bow High labial bow with apron springs Split labial bow www.indiandentalacademy.com
  • 8. Short labial bow Indications • Retraction of anteriors • Anterior spacing with proclination • Overjet reduction There should be good contact between canine and premolar www.indiandentalacademy.com
  • 9. • 0.7mm wire used • Fabrication:- labial segment of wire is placed at the junction of the incisal and middle third. www.indiandentalacademy.com
  • 10. Vertical segment starts from mesial third of canine, should be perpendicular to the incisor segment & should be away from gingiva Occlusally, it passes between canine and premolar www.indiandentalacademy.com
  • 11. Retentive ends adapted on the lingual or palatal side. Activation - Compressing the U-loop by 1mm www.indiandentalacademy.com
  • 12. Long labial bow Indications • Anterior space closure • Overjet reduction • Closure of the space distal to the canine • As a retaining device at the end of fixed therapy • Guidance of canine during canine retraction using palatal retractor www.indiandentalacademy.com
  • 13. • • • 0.7 mm wire used in active purpose 0.9 mm wire used in passive purpose Fabrication - same as short labial bow but occlusal wire passes between two premolars • Activated by compressing the U-loop www.indiandentalacademy.com
  • 14. Roberts retractor • It was first designed by G.H Robert • Indication it is suitable only for retraction of four incisors following retraction of canines www.indiandentalacademy.com
  • 15. • This is a flexible bow which is constructed from 0.5 or 0.6 mm wire inserted into a stainless steel tubing to give support to either end of the bow www.indiandentalacademy.com
  • 16. • Fabrication Labial segment of wire is placed at the junction of the incisal and middle third Extends only two thirds of the mesiodistal width of the lateral incisors A coil of 3mm internal diameter placed mesial to canine Distal part is supported in a stainless steel tubing www.indiandentalacademy.com
  • 17. • It is activated by closing the coil or giving palatal bend at the emergence of the coil www.indiandentalacademy.com
  • 18. Reverse labial bow • Indication For retaining tooth positions For minor tooth movements www.indiandentalacademy.com
  • 19. • 0.7 mm wire used • Fabrication:-loops are placed distal to the canine and the free ends of the Uloops are adapted occlusally between the premolar and canine www.indiandentalacademy.com
  • 20. • This is too stiff for effective incisor retraction • The stability ratio is poor Activation First the U-loop is opened this results in lowering of the labial bow in the incisor region . A compensatory bend is given at the base of the loop www.indiandentalacademy.com
  • 21. Begg’s labial bow (Wrap Around / Around the Globe Bow) • Popularized by P.R . Begg • It is used as retainer after fixed orthodontic therapy • 0.9 mm wire is used www.indiandentalacademy.com
  • 22. • Fabrication consists of labial wire that extends till the last erupted molar U-loop is incorporated at the pre molar and molar area to close the band spaces www.indiandentalacademy.com
  • 23. • Advantage of this bow is that there is no cross- over wire between the canine and premolar there by eliminating the risk of space opening up www.indiandentalacademy.com
  • 24. Mills retractor • It is also called extended labial bow • Indication Large overjet For alignment of irregular incisors www.indiandentalacademy.com
  • 25. • 0.7 mm wire is used • This labial bow has an extensive looping of the • • wire so as to increase the flexibility and range of action Poor patient acceptance Complex design www.indiandentalacademy.com
  • 26. Fitted labial bow • Used to secure the incisors firmly after they been • • • rotated It acts as retainer It is not used in active tooth movement 0.7 mm wire is used www.indiandentalacademy.com
  • 27. High labial bow with apron spring • • • • • Used in retraction of one or more teeth Large overjet It is very similar to a Roberts retractor Highly flexible Light force www.indiandentalacademy.com
  • 28. • Fabrication A heavy base arch of 0.9mm to 1mm wire extends into the buccal sulcus apron spring made of 0.4mm wire is attached to the high labial bow www.indiandentalacademy.com
  • 29. • Activation It is activated by bending the upright arms of the apron springs towards the teeth 3mm activation at a time Disadvantages are difficulty in construction and soft tissue injury www.indiandentalacademy.com
  • 30. Split labial bow • Used for anterior • retraction Closer of midline diastema www.indiandentalacademy.com
  • 31. Other bows • Protrusion bow • Palatal arch with central U-loop www.indiandentalacademy.com
  • 32. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com