BEGG’S APPLIANCES
Introduced by dr. PRA begg in 1950.
It is based on light wire differential force technique.
The begg’s techniques has been divided into three stages.
The crown tipping phase which includes first two stages and the root tipping phase which covers
the third phase.
BONWILL HAWLEY diagrams – these are to be used only to check the complete arch wires for
symmetry.
ARCH WIRE:
Most commonly used: 0.016” wire.
0.016” special plus- looped arch wire in any case.
0.016” special plus- plain arch wire in extraction case or which 1st and 2nd premolar are extracted.
0.018” – plain arch wire in extraction cases.
Initial arch wire:
The basic shape of initial arch wire depends upon the shape of malocclusion
The arch wire shape is proportional to the width , the form, and symmetry of dental arch.
There may be localized modifications of archwire in the vertical and horizontal plane and these
are called offset bend.
Offset bend:
In anterior segment
Vertical offset- to intrude or extrude:
Horizontal offset: to expand, contract, and rotate.
In posterior segment
Gingival offset- to avoid occlusion distortion and interference with bicuspids.
Cuspid offset:
To avoid lingual tipping of the cuspid and labial tipping of the lateral a horizontal offset is given
distal to the intermaxillary hook.
It is usually called the cuspid offset bend, however it provides for proper positioning of both
lateral and canine.
Shape of anterior segment:
The anterior curve of the initial arch wire is usually a compromise between the shape of the
malocclusion and that of normal occlusion.
INTERMAXILLARY HOOK
Routinely bent into the arch wire for both the upper and lower arches and are positioned 1mm
mesial to the cuspid brackets.
The coil pattern is usually a small helical loop 2 to 2.5 mm of outside diamtere.
Variation in location of intermaxillary hooks:
When plain arch wire is used along with anteriors in good alignment the hooks are 1-2mm
mesial to the cuspid bracket.
If slight space is required for the alignment of anteriors, the hooks are placed against the mesial
side of the cuspid bracket.
After thee anteriors have been aligned the hooks will be 2-3mm mesial to the bracket on either
side.
If anterior spacing is present the hooks should be placed in such a way that after the spaces are
closed the hooks are 1-2mm mesial to the cuspid bracket.
Mesiodistal uprightning spring for individual teeth
Springs are placed from the gingival and so that the coils rest over the arch wire. This
makes it necessary to have left-hand and right –hand springs.
Uprighting springs are made from 0.016 AJW wire. Those for use on cuspids have coils
containing three complete turns of wire. This affords a light force which remains
effective throughout a greater range of movement.
Springs with two turns in their coils are indicated for use on maxillary lateral incisors
when they must rest over the torque spur. It is sometimes necessary to use the springs
with the longer legs on maxillary lateral incisors and canines , because the torqueing
auxiliary prevents the springs from seating completely against the brackets.
Bending the maxillary torquing auxillaries
(1) Straighten a 6-inch length 0.016 AJW wire material.
(2) Place this length of wire into the central incisor brackets and pull the ends
incisally.
(3) Remove the wire from the mouth and grasp with a plier.
(4) The lateral incisor spur is bend .repeat procedure for opposite side.
(5) The ends of the auxiliary are cut distal to the cuspids and rolled upon themselves,
to prevent injury to the patients.
Activating the torqueing auxiliary
(1) Hold the auxiliary so the spurs are essentially parallel with the floor. Rotate
the auxiliary along its long axis so the spurs are at approximately 20◦ to the
horizontal.
(2) Maintaining this relationship , grasp the distal leg of the central incisor
spurs with the plier and using your finger , bend the end of the auxiliary by
moving it through an arc parallel with the floor.
(3) Repeat , grasping the distal leg of the lateral incisor spur , and bend the
end through another arc. the opposite end of the auxiliary is bent in the
same manner.
(4) Small “ V” bends can be made between spurs to further constrict the
auxillary.
Stage three arch wire form
(A) Occlusal view of upper stage three arch wire.
Note :-slight constriction.
(B) Occlusal view of lower stage three arch wire.
Note :- slight expansion.
Toe in and toe out bend
o They are horizontal offset bend that are often combined with the anchor bend .
o If the wire is bent lingually it is a toe in bend and if it is bent buccally it is a toe out bend.
Vertical loop
Used to supply increased arch flexibility or used for space opening or closing, stops,
rotation or root torque.
The most vertical loops to aligh 6 anterior teeth are five, one on each interproximal
area.
Generally loops are made 6 to 8 mm long but greater the length of the loop, the more
gentel the force on the tooth.
