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Orthodontics > Class II Div I > Flashcards

Class II Div I Flashcards

1
Q

BSI classification of Class I

A

Lower incisor edges occlude with or lie immediately below the cingulum plateau of the upper incisors

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2
Q

BSI Classification of Class II

A

Lower incisor edges lie posterior to the cingulum plateau of the upper incisors

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3
Q

BSI Classification of Class II Div I

A

Lower incisor edges lie posterior to the cingulum plateau of upper incisors

Upper incisors are proclined or of average inclination + increase in OJ

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4
Q

BSI Classification of Class II Div II

A

Lower incisor edge lie posterior to the cingulum plateau of upper incisors

Upper centrals are retroclined

OJ is reduced but can be increased

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5
Q

BSI Classification of Class III

A

Lower incisor edge lie anterior to the cingulum plateau of the upper incisors

OJ is reduced or reversed

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6
Q

What is the class II skeletal pattern of Class II Div I commonly due to?

A

Retrognathic mandible

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7
Q

Average maxillary incisor inclination

A

110

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8
Q

What does SNA relate to?

A

Position of maxilla to anterior cranial base

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9
Q

What does SNB relate to?

A

Position of mandible to anterior cranial base

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10
Q

SNA-SNB =

A

ANB

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11
Q

Average mandibular incisor inclination

A

90

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12
Q

Average FMPA

A

27

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13
Q

Average LAFH: TAFH

A

55%

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14
Q

Why are lips often incompetent in Class II Div I

A

Prominent upper incisors and/or underlying skeletal pattern

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15
Q

List examples of sucking habits

A

Thumb
Fingers
Blanket
Lip

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16
Q

Occlusal features of thumb sucking habit

A

Proclined upper anteriors

Retroclined lower anteriors

AOB
Posterior xbite

Narrow arch

17
Q

Habit treatment options

A

Do nothing

Stob habit

Removable appliance habit breaker

Fixed appliance habit breaker

18
Q

Function of headgear

A

Attempt to restrain growth of maxilla horizontally and/or vertically

19
Q

Growth modification treatment options

A

Headgear

Functional appliance

20
Q

What type of incisal classification are functional appliances most used for?

A

Mostly Class II div I

21
Q

How do functional appliances work?

A

Aim to restrain maxillary growth and encourage mandibular growth

22
Q

Examples of functional appliances

A

Tooth borne
- Twin block

Fixed
- Herbst

23
Q

What changes do functional appliances make?

A

Mostly dento-alveolar changes

Minor degree of skeletal changes

24
Q

What age should we use functional appliances?

A

Early use - about 10yrs

25
Q

Potential disadvantages of early treatment with functional appliances (2)

A
  1. Early skeletal effects from functional appliance/headgear may not be maintained long term
  2. Overall tx time increased 3 phase tx
26
Q

Potential benefits of early treatment with functional appliances

A
  1. Improve appearance earlier (teasing + psychological benefit)
  2. Reduce risk of trauma
  3. Often better compliance with appliance wear
27
Q

Draw a URA design for retroclining anterior teeth

A

AIM: please construct a URA to retrocline the anterior teeth

A: Roberts retractor 0.5mm ID tubing

R: 16+26 Adams clasps 0.7mm HSSW

A: Tick, stops medial to 3’s

B: FABP OJ+3mm

28
Q

How does upper premolar XLA’s create space for an OJ reduction?

A

Premolars XLa

Mesial movement of posteriors

Distal movement of anteriors

29
Q

How does non premolar XLA correct OJ?

A

Distal movement of 6s aided by XLA of 7s

30
Q

What jaw does orthognathic surgery usually include?

A

Usually mandibular

31
Q

When are fixed appliances required for Orthognathic surgery

A

Before surgery

During surgery

After surgery

32
Q

Process of orthognathic surgery for Class II Div I

A

Maxillary impaction
Mandibular advancement

33
Q

Process of orthognathic surgery for class III

A

Maxillary advancement
Mandible moved back

Orthodontics (5 decks)

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