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Ortho DEN305 > Removable appliances in orthodontics > Flashcards

Removable appliances in orthodontics Flashcards

1
Q

Advantages of removable appliances?

A

Removable

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2
Q

Disadvantages of removable appliances?

A 
Removable - not in mouth, lost/damaged
Can only tip teeth 
Affects speech
Poorly tolerated in lower arch
Intermaxillary traction not possible
Inefficient for multiple tooth movements
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3
Q

What does fully controlled movement require?

A

Attachment to tooth

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4
Q

Components (ARAB)/design of removable appliances?

A

Active components - how to move teeth
Retention - Stop if falling out
Anchorage - stop the wrong teeth moving
Baseplate and biteplanes

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5
Q

What active component is preferred to move teeth with removable appliances?

A

Most preferred = Springs - palatal, buccal
Screws
Least = elastics

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6
Q

What does the force of a spring depend on?

A

Thickness of wire - Force alpha diameter (squared 4)
Length of wire - Force alpha 1/length (squared 3)
Amount of deflection

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7
Q

What diameter wire is used for active components?

A

0.5-0.6mm diameter wire

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8
Q

How to increase the wire length?

A

Coil near acrylic

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9
Q

Palatal finger spring features?

A 
0.5 or 0.6mm wire
Coil near acrylic increases length
Coil on side away from direction of movement
Can use on any teeth
Not good on buccally placed teeth
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10
Q

How to adjust screws?

A

Quarter turn = 0.2mm
1 turn per week = just less than 1mm per month
2 turn per week = just less than 2mm per month

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11
Q

Indications for screws?

A

Moving blocks of teeth

Can move tooth and use for retention

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12
Q

Features of ortho elastics?

A

Poor control

Rarely used

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13
Q

How is posterior retention achieved with removable appliances?

A

Adams cribs - MB and DB undercuts of 0.25mm

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14
Q

How is anterior retention achieved with removable appliances?

A

C-clasp

Southend clasp

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15
Q

What is anchorage?

A

Control of unwanted tooth movement

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16
Q

How to not lose anchorage?

A

Light forces
Only move one tooth per side
Large anchor unit - more teeth included in appliance design
Headgear?

17
Q

Problems with headgear?

A

Co-operation

Safety

18
Q

How long should pts wear headgear a day?

A

12 hours per day (pt’s actually only wearing them 6.5hrs a day)

19
Q

Why is headgear safety important?

A

Catapulting accident

Night-time dismantling

20
Q

Problems of eye injury from headgear?

A

High risk of infection
Excellent culture medium
Difficult to control with antibiotics
Sympathetic ophthalmitis

21
Q

What is a baseplate’s functions?

A

Connect components
Carries passive wirework
Additional anchorage
Carries biteplanes

22
Q

Types of biteplanes and their uses?

A

Flat anterior bite plane - reduces overbite
Inclined bite plane - post functional appliances - retains functional appliance treatment, proclines lower incisors (negative)
Posterior biteplane - free the occlusion

23
Q

Cases to treat with removable appliances?

A 
Disimpaction of 1st molars
Class III - anterior crossbite
Posterior crossbite in mixed dentition or expansion prior to functional appliances
Space maintenance
Overbite correction
24
Q

How to adjust an adams crib?

A

Gently roll arrowhead in or out with pliers

25
Q

How to adjust a Z spring?

A

Pull forwards and upwards - away from baseplate

26
Q

How to fit an upper removable appliance?

A 
Check lab ticket
Explain how the appliance works
Try in
Adjust retentive components if required
Activate
Adjust bulky biteplates if appropriate
Demonstrate then check pt can fit and remove
Instructions when to wear, how to clean
Document everything done
27
Q

How to do a visit by visit assessment?

A 
Talk to pt and parent
Assess for signs of wear
Assess progress, measure changes
Assess OH
Assess retention
Check if active component is active
Reassess anchorage
Document findings and plan

Ortho DEN305 (16 decks)

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