Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

F - SCR > Class III > Flashcards

Class III Flashcards

1
Q

what is definition of Class III?

A

Lower incisor edge occludes anterior to the cingulumplateau of the upper central incisor

The overjet is reduced or reversed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

1) what could skeletal aetiology of class II be due to?

A

1) Small maxilla
Large mandible
Combination of
both

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

2) what are skeletal features of class III

A

2) Usually present with a Class 3 skeletal base
relationship
Can present with a Class 1 and rarely a Class 2 skeletal base relationship
The greater the A-P discrepancy the more complex the malocclusion is to treat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do you use for vertical relationships and what is more complex to treat?

A

 May be associated with average, increased or reduced
vertical proportions
- Frankfort Mandibular Planes Angle
- Facial Height proportions
- Lateral Cephalometry

increase FMPA and anterior open bite more complex to treat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is this measuring?

A

FMPA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is this measuring?

A

facial height proportions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is transverse relationship of Class III?

A

A-P and transverse relationship linked

Retrusive maxilla sits on wider part of mandible
- Bilateral Crossbites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what are dental features of class III?

A

Vary
- Class III incisor relationship
- Tendency to reverse overjet
- Reduced overbite, anterior open bite may be present
- anterior Crossbites
- Maxilla often crowded
- Mandible often aligned or spaced
- proclined uppers
- retroclined lowers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what are soft tissue features of Class III?

A
  • Tongue proclines the upper
    incisors
  • Lower lip retroclines lower
    incisors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

why treat a class III?

A

Aesthetics
- Dental
- Profile concerns
Dental health reasons
- Attrition
- Gingival recession
- Mandibular Displacement Function
- Speech
- Mastication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are factors of Class III which make treatment more difficult? and in regards to facial growth?

A

number of teeth in anterior crossbite

Presence of anterior open bite

Mandibular growth continues for longer
Potential for Class III to get worse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are class III management options?

A

Accept/ Monitor - Mild Class III/ or unsure how growth and development will progress

Intercept early with URA - Early correction of incisor relationship

Growth Modification - Functional appliance/ Head Gear/ TAD’s

Camouflage - Accept underlying skeletal relationship. Correct incisors to Class I

Combined Orthognathic/ Orthodontic Tx - Functional/Masticatory/ or profile concerns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

1) when to accept and monitor?

A

1) No concerns
No dental health indications
No Displacements
No attrition
Mild cases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

2) When to use interceptive tx? what does it do?

A
  • if class III incisors developed to early contact permanent incisors
    *mandibular displacement
  • fix anterior crossbite in mix dentition
    *forward mandibular growth countered by dento-alveolar comp
  • only able correct lateral incisor crossbite if canine high abover lateral roots
    *delay if canine drop to buccal position cause risk resorption lateral
  • URA procline incisors over bit
    *good OB maintain stability
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

1) when to use growth modification?

2) types of functional appliances?

3) aim of it?

A

1) Growing patient

2) Functional appliances
Chin cup
Reverse Twin Block Frankel III

Protraction headgear ± Rapid Maxillary Expansion

3) Aimed at reducing and / or redirecting mandibular growth and encourage maxillary growth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is this and what does it do?

A

Frankel III

Pellotes (Shields) labial to upper incisors to hold lip away

Palatal arch to procline the upper incisors

Lower labial bow to retrocline the lower incisors

17
Q

what is this?

A

reverse twin block

18
Q

what is this and explain it?

A

Protraction Headgear

Co-operative patient
14 hour/day protraction facemask wear
400g/side
Best results when used in early mixed dentition ( 8-10
years)
± Rapid maxillary Expansion
- Disrupts circum-maxillary sutures

19
Q

what are bollard implants?

A

Used in late mixed and permanent dentition

Infrazygomatic crest and lower canine region

Mucoperiosteal flaps need to be raised for
insertion and removal

20
Q

what would treatment plan be for class III? camouflage

A
  1. XLA all first permanent molars
  2. SR LL8 and LR8
  3. Upper and lower fixed appliances to treat to Class I
  4. Life long retention
21
Q

what do you do in terms of treatment for patients that are still growing?

A

Do not embark on full correction if still growing
- Can not predict growth changes
- Consider upper arch alignment only
- Do not XLA in lower arch as this could affect future
treatment options

22
Q

1) what is idea of orthodontic camouflage?

2) what are favourable features for it?

3) What do you actually do?

4) What are aims?

A

1) Accept underlying skeletal base relationship
- Aim for class 1 incisors

2) Growth stopped
Mild to moderate Class III Skeletal base ANB not <0˚
Average or increased overbite
Able to reach edge to edge incisor relationship
Little or no dentoalveolar compensation

3)Extraction pattern
- Extract further back in the upper arch
- Extract further forward in the lower arch
- Classic pattern - Upper 5’s , lower 4’s

However not always possible
- Dental health may dictate extraction pattern

4) Procline upper incisors
Retrocline lower incisors
Correct overjet

23
Q

what is purpose of orthognathic surgery approach?

A

Orthognathic surgery is surgical manipulation of the mandible and / or maxilla to produce optimal
dentofacial aesthetics and function

24
Q

camouflage

3) What do you actually do?

4) What are aims?

A

3)Extraction pattern
- Extract further back in the upper arch
- Extract further forward in the lower arch
- Classic pattern - Upper 5’s , lower 4’s

However not always possible
- Dental health may dictate extraction pattern

4) Procline upper incisors
Retrocline lower incisors
Correct overjet

25
Q

1) when do you do orthognathic surgery treatment?

2) who is part of mdt for it?

A

1) Pt usually has aesthetic or functional concerns
Growth completed
Moderate/Severe skeletal discrepancy
- A-P
- Transverse
- Vertical

2) Orthodontist
Maxillofacial surgeon
Technician
Psychologist

26
Q

what is treatment for orthognathic surgery?

A

Presurgical orthodontics (approx. 18 months)
- Level, align, co-ordinate and decompensate
* Uppers 109˚
* Lowers 90˚

Orthognathic surgery to reposition the jaws
- Mandible
- Mandible ± Maxilla

Post surgical Orthodontics (approx. 6 months)

27
Q

what is GDP role of class III?

A

 GDP role
 Identify Class III malocclusion
 Refer to hospital service or specialist practitioner

 URA Treatment ?
 Anterior cross-bite correction

F - SCR (32 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions