Class I Malocclusion Flashcards

1
Q

Aetiology of crowding

Imbalances in…

A

Jaw size
Tooth Size
Arch perimeter
Reduction in size of jaws

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

Solving crowding

A

Expansion - anterior, posterior (distal)
Distal movement
Enamel stripping
Extraction

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

Expansion e.g posterior crossbite

Methods

A

Widen upper arch

Bring incisors forward

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

Problems with expansion

Expansion to treat crowding

A

Relapse if over expanded
Fenestration of labial plate
Aesthetics
Schwarz appliance not good to expand lower arch

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

Relapse is

A

Inevitable by 50% in most cases

Expansion of arches is not very stable

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

Relapse - Non-extraction arch development

A

10% long term success

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

Relapse - Premolar extractions

A

30% long term success

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

Limits of expansion
Canines
Incisors
Breadth

A

0mm
2mm
3mm

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

Fenestration of labial plate

A

Over expansion may lead to roots moving past plate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Aesthetics

A

Lip support - thin - non extraction

Full lips and protruded incisors - think about extraction

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

Distal movement

give e.g

A

Retract upper 6 and 7 if erupted
Retract premolars and canine
Align canine

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

Distal movement of upper arch methods

A

Headgear
Non-compliance appliances
temporary anchorage devices

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

Distal movement in lower arch

A

Lip bumper

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

Non compliance appliances

A

Pendulum

Distal jet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Distal movement of upper buccal segments

A
Well aligned lower arch 
Half unit class II molars
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Lower arch

A

Lip bumper

Doesn’t work

17
Q

Enamel stripping/interproximal reduction

A

Remove up to 0.25mm enamel from contact points

18
Q

Extraction

A

Most common solution

19
Q

Spacing - 3 issues

A

Midline diastema
Generalised spacing
Missing teeth

20
Q

Midline diastema

A

Mesial movement

21
Q

Generalised spacing

A

Difficult if associated with missing teeth

22
Q

Missing teeth e.g missing laterals
Options
Take into account

A
May be restorative issue
Open space
Close space
Restorative replacement
Malocclusion 
Molar relationship 
Space.
23
Q

Missing lateral incisors
Class II
Class III

A

Close space

Open space

24
Q

Displaced teeth

Most common is?

A

Upper permanent canine

25
Q

Displaced maxillary canines result from

A

Palatal impaction

Buccal impaction

26
Q

Procedure for palatal impaction

A

Leave and monitor
Extract
Expose and align
Transplant

27
Q

Procedure for buccal impaction

A
Closed exposure (attach gold chain and bring down) 
Open exposure (apically reposition flap)