Post on 07-Apr-2018
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A general consideration of
Stage I in Begg Technique.
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Introduction
General objective of any ortho trt. toobtain a result that simulates normal
occlusion. With Begg tecchnique objective achieved
by dividing trt. into 3 stages.
Stages I and II Crown tipping phase.
Stage III Root tipping phase.
Stage IV Finishing phase
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Overlapping of the stages must be avoided.
Ie. Objectives of each stage met before
proceeding Therefore better results and fewer problems are
encountered.
Division into stages
to prevent anchorage failure
Teaching and learning made easier.
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Objectives of Stage I
Correction of crowding and irregularity
Closure of anterior spaces.
Correction of rotations.
Elimination of deep bites -edge to edgebite / openbite except in class III
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Openbites Overbite relations
Correction of Mesiodistal relations of
buccal segments Class I and Class II Mild class III
Class III Class I or Class II
Co-ordination of upper and lower arches.
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Correction of anterior and posterior crossbites.
Axial relation of anchor molars corrected upright position.
Extraction spaces become smaller
All tooth movements carried outsimultaneously & in both arches.
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Orthodontic apparatus in Stage I.
Attachments Bands, brackets, tubes &
lingual cleats.Archwires
Ligatures.
Elastics.
Auxiliaries.- Rotation springs.
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Apparatus applied simultaneously
to avoid breakage
Act simultaneously to reciprocal adv. witheach other
Creeping into trt. Also avoided Severe loss
of anchorage.
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Archwires Material
0.016 special AJW principal wire of Stage I.
Combination of resilienbcy and flexibility.
Adequate stiffness for bite opening Developed by rigid control in wire drawing
and heat trt.
0.018 special Molar extraction cases
0.014 special rotating springs.
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Parts.
Intermaxillary Hooks ( IMH )
Small loops for engaging elastics and cuspid ties 2 types
Boot
Circle/ Helical
Adv of Circle hook. 2 2.5 outside dia.
Mesial & Distal rolling possible
Less space requirement.
Less distortion Greater stiffness in horizontal and vertical plane.
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Location
Well aligned ant. 1-2 mm mesial to the
cuspid bracket. Spaced ant. Farther mesially.
Mildly crowded ant. impinging on thebracket.
Severley crowded multi loop wires.
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Anterior Segement.
Portion of the wire b/w intermaxillary IMH lies
gngival to buccal segment for effectiveintrusion
Reverse curve at midline 2-3 mm elevatedform occusal plane for even intrusion.
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Cuspid Offset bend.
Horizontal offset bend mesial to the IMH.
Proper positioning of the cuspid and the lateralincisor.
Cuspid Curve:
Labial curvature in cuspid area incorporatedto avoid lingual tipping of canines.
In narrow arches requiring expansion, cuspid
offset given.
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Anchorage bends / Tip back bends.
In buccal segment of the archwire mesial to
the tube with vertex facing occlusally.
Angulation depends on
Stage of trt. - as stage progresses.
Depth of overbite - with bite opening.
Rate of progress of case.
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Inclination of anchor molars.
Mild to moderate inclination slight anchor
bend.
Severe inclination Initially no anchor bend.
Later gradually increases anchor bend to
upright the molar.
No intrusion of anteriors beyond edge to edge
or mild openbite.
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Location depends on
Time elapsed since commencement of trt. as
far mesially.
Distal to ccuspid bracket.
In mild open bite and overbite anchor curve.
Depth of overbite.
Greater reduction in overbite if closer to the
molar tube.
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Rate of progress.
Amount of space remaining.
Location in looped archwire.
Non extn. cases
1st molar extn. cases.
2nd Premolar extn. cases.
Nearer
thetube
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Toe in and toe out bends.
Horizontal offset bends combined with anchor
bends.
Anchorage bend bent lingually toe in.
Anchorage bend bent buccally toe out.