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Orthodontic Therapy > Orthodontic therapy > Flashcards

Orthodontic therapy Flashcards

Basic flashcards for Orthodontic therapy/nursing students

1
Q

Name 3 types of orthodontic appliances

A

Fixed
Functional
Removable

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2
Q

What is proclination?

A

The upper and lower incisors are inclined labial to a greater degree than normal

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3
Q

What is retroclination

A

The upper and lower incisors are inclined palatal

to a greater extent than normal

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4
Q

Name 3 components of a URA

A

Base plate, retentive components, active components

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5
Q

Name the components of a fixed appliance

A 
Brackets
Bands
Ligatures
Archwires
Auxiliaries
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6
Q

What is a class I (incisor relationship)

A

The lower incisal edge occludes below the cingulum plateau of upper incisors.

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7
Q

What is a Class II Div I (incisor relationship)

A

The lower incisal edge occludes behind the cingulum plateau of upper incisors. Upper incisors are usually inclined or proclined and overjet usually increased.

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8
Q

What is a Class II Div II (incisor relationship)

A

The lower incisal edge occludes behind the cingulum plateau of upper incisors. Upper incisors usually retronclined and overbite usually increased.

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9
Q

What is a Class III (incisor relationship)

A

Lower incisal edge occludes anterior to cingulum plateau of upper incisors. Overbite edge to edge or in reverse.

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10
Q

What is the curve of spee?

A

Flat occlusal plane

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11
Q

Define the term scissor bite?

A

One or more buccal segment teeth occlude entirely buccal to the lower arch teeth

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12
Q

What amount of force is required intrusion?

A

10-20gm

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13
Q

What amount of force is required for extrusion and tipping?

A

35-60gm

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14
Q

What amount of force is required for bodily movement?

A

70-120gm

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15
Q

What are the limitations of orthodontic treatment?

A 
Medical history
Dental history
Patient compliance
Hypodontia
Tooth size discrepancy
Skeletal discrepancy
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16
Q

What are the stages of Orthodontic treatment?

A

Planning
Active
Retention

17
Q

Describe the sequencing of archwires.

A

Levelling & aligning
Space closure
Finishing & detailing

18
Q

What is parallax?

A

The principle of radiographic parallax is employed to determine whether the impacted canine is placed buccal or palatal to adjacent teeth.

19
Q

What force is required for anchorage?

A

20-25 gm

20
Q

What is anchorage?

A

The resistance to unwanted tooth movement

21
Q

Explain Newton’s 3rd law

A

To every action, there is an equal and opposite reaction

22
Q

Name as many methods of anchorage as you can

A 
Transpalatal arch
Nance
Elastics
URA
TAD's (temporary anchorage device)
23
Q

On average how many (mm) reduction in the overjet should we expect per month?

A

1mm

24
Q

What are TAD’s, and what do they do?

A

Temporary anchorage device, used as headgear alternative, aid space closure, help create asymmetric arches.

25
Q

Why would you use a NITI coil spring?

A

Space closure and OJ reduction

26
Q

Name the active components of a removable appliance

A 
T/Z Springs (buccal movement)
Finger Springs (mesio-distal movement)
Labial bow (reduces OJ)
Expansion screw (expands maxillary width)
Biteplane (reduces OB)
27
Q

Name the retentive components of a removable appliance

A

Adams clasps
Cribs
Arrowheads

28
Q

List the 6 Andrews Keys

A 
Correct molar relationship
Correct crown angulation (Tip)
Correct crown inclination (torque)
No rotations 
No spaces
Curve of spee
29
Q

What is abfraction?

A

Non carious tooth loss, occurs around gingival margin, can occur from traumatic force caused by bruxism

30
Q

Where are the following supernumary teeth located?
Mesiondens
Distomolar
Paramolar

A

Mesiondens - Maxillary central & incisors (most common supernumary)
Distomolar - Distal to 3rd molar
Paramolar - buccal or lingual to molar

31
Q

What is hylanisation?

A

Too much force is used, roots start to resorb, tooth mobility, movement stops

32
Q

What is the ‘leeway space’?

A

Difference in space in the arch when the D’s & E’s exfoliate and the 4’s & 5’s erupt.

Orthodontic Therapy (1 decks)

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