1.
HEAD GEARS
INDIAN DENTAL ACADEMY
Leader in continuing dental education
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2.
DEFINITION
Headgear is a device by which
extraoral force is almost always
applied to the first molars via a face
bow and a strap on the head or neck for
anchorage
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3.
Uses:
1.Treating skeletal problems in
preadolescent
children
2.Anchorage
3.Molar distallization
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4.
Types of Head gears
1.High pull H.G(parietal)
2.Medium pull H.G(occipital)
3.Low pull H.G(cervical)
4.Combee pull H.G
5.High pull H.G with ‘J” Hooks
6.Medium pull H.G with ‘J’Hooks
7.Low pull H.G with ‘J’ Hooks
8.Reverse pull H.G
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5.
Mechanical Principles:
1.F ORCE:It is that which changes or tends
to change the position of rest of a body or
its uniform motion in a straight line.
2.CENTER OF RESISTANCE:It is that
point through which the resultant of the
constraining forces acting upon it may be
considered to act
3.CENTER OF ROTATION:It is that point
around which a body will rotate or tip.
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6.
Mechanical Principles (contd).
4.FORCE RESOLUTION:Forces may be
resolved into component vectors ,which in a
single plane of space, are at right angles to
each other.
5.LINE OF ACTION:It is the direction in
which the force acts.
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7.
Selection of Headgear:
Extrusion of teeth and steepening of O.P-Cervical H.G
with outer bow even or low
Extrusion of teeth and flatenning of O.P-Cervical H.G with
outer bow very high
Intrusion of teeth and steepening of O.P-Occipital H.G
with outer bow post to C.O.R
Intrusion of teeth and flatenning of O.P-Occipital H.G with
outer bow ant to C.O.R
Distal force and flatenningo of O.P- Combee pull H.G with
outerbow above C.R
Distal force and steepening of O.P-Combeepull H.G with
outer bow below C.R
Distal force with no change in O.P-Combeepull H.G with
outer bow throu C.R
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8.
Duration Of Wear:
Non-extraction,full cusp cl-II,good growth
increments,forward growth rotation-Full
time wear
Holding Anchorage-18-20 hrs per day.
Precautionary measure- Night use
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9.
Newer method of determining
H.G force system:
Maj.Steven.L.Cureton-1992jco
The direction of force of a H.G at the
C.O.R of a tooth or group of teeth can be
accurately assessed by projecting a profile
slide of the patient over a cephalometric
tracing.
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10.
CONCLUSION:
A cooperative patient and a clinician
prepared to monitor progress and able to
redirect the course of treatment at the right
moment may successfully treat a wide range
of malocclusions with a single headgear
approach.
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11.
Thank you
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Leader in continuing dental education
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