Headgear Flashcards by Leanne Hughes

Define Headgear

An orthodontic appliance that provides:
EOA - extra oral anchorage
EOT - extra oral traction
Via attachment if another appliance
(Fixed and removable)

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Define EOA Headgear

Prevents unwanted tooth movement outside the mouth

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How is EOA achieved

Prevents forward movement of the molars
Force applied - back of the head = distalising the molars

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EOA - force and duration

200 -250g per side
10 - 12 hours a day

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Define EOT Extra Oral Traction

Moving teeth using forces outside the mouth

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How is EOT achieved?

Force applied behind the head to hold the anchor teeth back

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What tooth movements are created with EOT

Distals molars
Extrusion/ intrusion molars
Maxillary restraint
Reduction in Overjet
Correction of crossbites
Creates space

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Can EOT change facial heights and the Frankfort - mandibular plane angle?

Yes LAFH/ FMPA can increase or decrease
Helped by encouraging growth rotations

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EOT magnitude and duration

450- 500g per side
14-16 hours

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Name the three types of headgear

Cervical (Low)
Combi (straight)
High Pull

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What does Cervical low pull headgear achieve?

Distalisation and extrusion of the molars
Increases LAFH by extrusion of molars

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What pts are Cervical low pull headgear used on?

Skel II
Decreased LAFH/ FMPA
Deep/ increased overbite
Forward growth rotations

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What growth rotation is encouraged with Cervical Low pull headgear

Backward growth of the mandible by:
Extruding the molars
Increases the MMPA and LAFH=
Furthers buccal extrusions and reduces the deepbite

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Where is the force transmitted with Cervical low pull headgear

BELOW the occlusal plane

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What does Combi/ Straight pull headgear achieve?

Distalisiation of the molars and EOA

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What direction of pull does the Combi/straight pull have?

High and low pull

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Where is the force transmitted with combi/straight pull headgear?

Level with the occlusal plane

What does High pull headgear achieve?

Distalisiation of the molars
Intrusion of the molars
Maxillary restraint

What type of patient would have High Pull Headgear?

Skel III
Increased LAFH/FMPA
AOB or decreased overbite
Backward growth rotations

What growth rotation is encourage with High pull Headgear?

Forward Growth rotations:
Intrudes posterior segment in the maxilla = forward growth of the mandible
- Reduces MMPA and LAFH
- Reduces AOB

Where is the force located with High Pull?

Above the occlusal plane

where is the centre of resistance found with High Pull?

pre molar region of maxilla

Name the three components of Headgear

Way of attachment
Neck strap/headcap
Elastic/spring mechanism

What is an example of a way of an attachment on Headgear?

Facebow
J hooks

Where do Facebow's slot in on removable and functional appliance?

A tube is soldered into the bridge of the adam's clasp

Where do Facebow's slot in a fixed appliance?

Tubes on molar bands

Where do J hooks hook into a fixed appliance?

Directly into the archwire

Where do J hooks hook into a removable appliance?

Loops on a removable appliance

What type of Headgear uses a neck strap?

Cervical low pull and Combi Straight

What type of headgear uses a Headcap?

High pull

What is the function of the Elastic component or spring mechanism?

To connect the way of attachment and neckstrap/headcap It controls the magnitude of the force

How is the Elastic force produced?

Elastic Strap EO elastic bands Spring mechanisms

How many safety features do Headgear have to have?

At least 2 1. Extra Oral 1. Intra Oral

Name Intra Oral safety Mechanisms on Headgear

Locking Facebow with blunt ends and catches to lock in the tubes

Name Extra Oral safety Mechanisms on Headgear

1.Rigid Masal Strap - prevents facebow being dislodged 2. Snap away modules

What cases are Reverse Headgear used on?

Class III

What is the function of reverse headgear?

1.Forward movement of the maxilla 2.move teeth mesially - to close space 3. stop the mandible from protruding

What is used for the force of resistance in Reverse Headgear?

The forehead

What is used to measure force on Headgear

Correx Gauge

What is small Correx gauge used to measure?

The forces of extra oral or intra oral elastics

What is a big Correx Gauge used to measure?

The forces on Headgear

Headgear Instructions

• remove for brushing 3xaday •not to eat with the appliance in •ensure safety mechanisms are used •to wear as prescribed • if it comes apart at night, to remove asap and to contact the Orthodontist asap • could be painful 3-5 days. To take what you would for a headache