Bows /certified fixed orthodontic courses by Indian dental academy

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

LABIAL BOWSLABIAL BOWS
• Labial bow is an essential component ofLabial bow is an essential component of
removable orthodontic appliancesremovable orthodontic appliances
• It can be either active or passiveIt can be either active or passive

• The principal function of the bow is toThe principal function of the bow is to
retrude the anterior teethretrude the anterior teeth
• It can be used for retentive purposesIt can be used for retentive purposes

Parts of labial bowParts of labial bow
• The incisor segmentThe incisor segment
• Vertical loopsVertical loops
• The occlusal or crossThe occlusal or cross
over sectionover section
• The retentive endsThe retentive ends

Placement of the incisor segmentPlacement of the incisor segment
• Active bowActive bow
placed at the junction of incisal andplaced at the junction of incisal and
middle thirdmiddle third
• 0.6 or 0.7 mm SS Wire used0.6 or 0.7 mm SS Wire used

• Retentive or passive bowRetentive or passive bow
placed at the junction of cervical andplaced at the junction of cervical and
middle third or below the height ofmiddle third or below the height of contourcontour
• 0.9 or 1 mm SS Wire used0.9 or 1 mm SS Wire used

TypesTypes
• Short labial bowShort labial bow
• Long labial bowLong labial bow
• Roberts retractorRoberts retractor
• Reverse labial bowReverse labial bow
• Begg’s labial bowBegg’s labial bow
• Mills retractorMills retractor
• Fitted labial bowFitted labial bow
• High labial bow with apron springsHigh labial bow with apron springs
• Split labial bowSplit labial bow

Short labial bowShort labial bow
IndicationsIndications
• Retraction of anteriorsRetraction of anteriors
• Anterior spacing with proclinationAnterior spacing with proclination
• Overjet reductionOverjet reduction
There should be good contact betweenThere should be good contact between
canine and premolarcanine and premolar

• 0.7mm wire used0.7mm wire used
• Fabrication:-Fabrication:- labial segment of wire islabial segment of wire is
placed at the junction of the incisal andplaced at the junction of the incisal and
middle third.middle third.

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

Retentive ends adapted on the lingual or palatalRetentive ends adapted on the lingual or palatal
side.side.
ActivationActivation - Compressing the U-loop by 1mm- Compressing the U-loop by 1mm

Long labial bowLong labial bow
IndicationsIndications
• Anterior space closureAnterior space closure
• Overjet reductionOverjet reduction
• Closure of the space distal to the canineClosure of the space distal to the canine
• As a retaining device at the end of fixedAs a retaining device at the end of fixed
therapytherapy
• Guidance of canine during canineGuidance of canine during canine
retraction using palatal retractorretraction using palatal retractor

• 0.7 mm wire used in active purpose0.7 mm wire used in active purpose
• 0.9 mm wire used in passive purpose0.9 mm wire used in passive purpose
• FabricationFabrication - same as short labial bow but- same as short labial bow but
occlusal wire passes between twoocclusal wire passes between two
premolarspremolars
• ActivatedActivated by compressing the U-loopby compressing the U-loop

Roberts retractorRoberts retractor
• It was first designed byIt was first designed by G.H RobertG.H Robert
• IndicationIndication
it is suitable only for retraction of fourit is suitable only for retraction of four
incisors following retraction of caninesincisors following retraction of canines

• This is a flexible bow which is constructedThis is a flexible bow which is constructed
from 0.5 or 0.6 mm wire inserted into afrom 0.5 or 0.6 mm wire inserted into a
stainless steel tubing to give support tostainless steel tubing to give support to
either end of the boweither end of the bow

• FabricationFabrication
Labial segment of wire is placed at the junction ofLabial segment of wire is placed at the junction of
the incisal and middle thirdthe incisal and middle third
Extends only two thirds of the mesiodistal width ofExtends only two thirds of the mesiodistal width of
the lateral incisorsthe lateral incisors
A coil of 3mm internal diameter placed mesial toA coil of 3mm internal diameter placed mesial to
caninecanine
Distal part is supported in a stainless steel tubingDistal part is supported in a stainless steel tubing

• It is activated by closing the coil or giving palatalIt is activated by closing the coil or giving palatal
bend at the emergence of the coilbend at the emergence of the coil

Reverse labial bowReverse labial bow
For retaining tooth positionsFor retaining tooth positions
For minor tooth movementsFor minor tooth movements

• 0.7 mm wire used0.7 mm wire used
• FabricationFabrication:-loops are placed distal to:-loops are placed distal to
the canine and the free ends of the U-the canine and the free ends of the U-
loops are adapted occlusally betweenloops are adapted occlusally between
the premolar and caninethe premolar and canine

• This is too stiff for effective incisor retractionThis is too stiff for effective incisor retraction
• The stability ratio is poorThe stability ratio is poor
ActivationActivation
First the U-loop is opened this results inFirst the U-loop is opened this results in
lowering of the labial bow in the incisor region .lowering of the labial bow in the incisor region .
A compensatory bend is given at the base ofA compensatory bend is given at the base of
the loopthe loop

Begg’s labial bowBegg’s labial bow
((Wrap Around / Around the Globe Bow)Wrap Around / Around the Globe Bow)
• Popularized byPopularized by P.R . BeggP.R . Begg
• It is used as retainer after fixed orthodonticIt is used as retainer after fixed orthodontic
therapytherapy
• 0.9 mm wire is used0.9 mm wire is used

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

• Advantage of this bow is that there is noAdvantage of this bow is that there is no
cross- over wire between the canine andcross- over wire between the canine and
premolar there by eliminating the risk ofpremolar there by eliminating the risk of
space opening upspace opening up

Mills retractorMills retractor
• It is also called extended labial bowIt is also called extended labial bow
Large overjetLarge overjet
For alignment of irregular incisorsFor alignment of irregular incisors

• This labial bow has an extensive looping of theThis labial bow has an extensive looping of the
wire so as to increase the flexibility and range ofwire so as to increase the flexibility and range of
actionaction
• Poor patient acceptancePoor patient acceptance
• Complex designComplex design

Fitted labial bowFitted labial bow
• Used to secure the incisors firmly after they beenUsed to secure the incisors firmly after they been
rotatedrotated
• It acts as retainerIt acts as retainer
• It is not used in active tooth movementIt is not used in active tooth movement

High labial bow with apron springHigh labial bow with apron spring
• Used in retraction of one or more teethUsed in retraction of one or more teeth
• Large overjetLarge overjet
• It is very similar to a Roberts retractorIt is very similar to a Roberts retractor
• Highly flexibleHighly flexible
• Light forceLight force

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

• ActivationActivation
It is activated by bending the upright arms of theIt is activated by bending the upright arms of the
apron springs towards the teethapron springs towards the teeth
3mm activation at a time3mm activation at a time
Disadvantages are difficulty in construction and softDisadvantages are difficulty in construction and soft
tissue injurytissue injury

Split labial bowSplit labial bow
• Used for anteriorUsed for anterior
retractionretraction
• Closer of midlineCloser of midline
diastemadiastema

Other bowsOther bows
• Protrusion bowProtrusion bow
• Palatal arch with central U-loopPalatal arch with central U-loop

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Bows /certified fixed orthodontic courses by Indian dental academy

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