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Orthodontic Therapy > Headgear > Flashcards

Headgear Flashcards

1
Q

Define Headgear

A

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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2
Q

Define EOA Headgear

A

Prevents unwanted tooth movement outside the mouth

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3
Q

How is EOA achieved

A

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

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4
Q

EOA - force and duration

A

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

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5
Q

Define EOT Extra Oral Traction

A

Moving teeth using forces outside the mouth

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6
Q

How is EOT achieved?

A

Force applied behind the head to hold the anchor teeth back

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7
Q

What tooth movements are created with EOT

A

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

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8
Q

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

A

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

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9
Q

EOT magnitude and duration

A

450- 500g per side
14-16 hours

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10
Q

Name the three types of headgear

A
  1. Cervical (Low)
  2. Combi (straight)
  3. High Pull
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11
Q

What does Cervical low pull headgear achieve?

A

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

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12
Q

What pts are Cervical low pull headgear used on?

A

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

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13
Q

What growth rotation is encouraged with Cervical Low pull headgear

A

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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14
Q

Where is the force transmitted with Cervical low pull headgear

A

BELOW the occlusal plane

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15
Q

What does Combi/ Straight pull headgear achieve?

A

Distalisiation of the molars and EOA

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16
Q

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

A

High and low pull

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17
Q

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

A

Level with the occlusal plane

18
Q

What does High pull headgear achieve?

A

Distalisiation of the molars
Intrusion of the molars
Maxillary restraint

19
Q

What type of patient would have High Pull Headgear?

A

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

20
Q

What growth rotation is encourage with High pull Headgear?

A

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

21
Q

Where is the force located with High Pull?

A

Above the occlusal plane

22
Q

where is the centre of resistance found with High Pull?

A

pre molar region of maxilla

23
Q

Name the three components of Headgear

A
  1. Way of attachment
  2. Neck strap/headcap
  3. Elastic/spring mechanism
24
Q

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

A

Facebow
J hooks

25
Q

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

A

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

26
Q

Where do Facebow’s slot in a fixed appliance?

A

Tubes on molar bands

27
Q

Where do J hooks hook into a fixed appliance?

A

Directly into the archwire

28
Q

Where do J hooks hook into a removable appliance?

A

Loops on a removable appliance

29
Q

What type of Headgear uses a neck strap?

A

Cervical low pull and
Combi Straight

30
Q

What type of headgear uses a Headcap?

A

High pull

31
Q

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

A

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

32
Q

How is the Elastic force produced?

A

Elastic Strap
EO elastic bands
Spring mechanisms

33
Q

How many safety features do Headgear have to have?

A

At least 2
1. Extra Oral
1. Intra Oral

34
Q

Name Intra Oral safety Mechanisms on Headgear

A

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

35
Q

Name Extra Oral safety Mechanisms on Headgear

A

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

36
Q

What cases are Reverse Headgear used on?

A

Class III

37
Q

What is the function of reverse headgear?

A

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

38
Q

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

A

The forehead

39
Q

What is used to measure force on Headgear

A

Correx Gauge

40
Q

What is small Correx gauge used to measure?

A

The forces of extra oral or intra oral elastics

41
Q

What is a big Correx Gauge used to measure?

A

The forces on Headgear

42
Q

Headgear Instructions

A

• 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

Orthodontic Therapy (29 decks)

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