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BDS4 ORTHODONTICS > CLASS II DIV 1 > Flashcards

CLASS II DIV 1 Flashcards

1
Q

What is the BSI definition of Class II Div 1?

A
  • the lower incisor edges lie posterior to the cingulum plateau of the upper incisors
  • there is an increased overjet
  • the upper CIs are proclined or of average inclination
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2
Q

What % of malocclusions are Class II div 1?

A

15-20%

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3
Q

Why should class II div 1 malocclusions be treated?

A
  1. concerns regarding aesthetics
  2. concerns regarding dental health
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4
Q
A
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5
Q

What dental health risks are associated with a Class II Div 1 malocclusion?

A

trauma

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6
Q

What skeletal pattern is class II div 1 most likely associated with?

A

Class II skeletal pattern

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7
Q

What commonly causes a class II skeletal pattern?

A

retrognathic mandible most common
(maxillary protrusion less common)

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8
Q

What are the potential causes for the overjet in a Class II div 1 malocclusion?

A
  • altered skeletal pattern
  • tooth inclination
  • combination of both
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9
Q

What is the normal value for SNA on a lateral cephalogram?

A

81 +/- 3

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10
Q

What is the normal value for SNB on a lateral cephalogram?

A

78 +/- 3

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11
Q

What is the normal value for ANB on a lateral cephalogram?

A

3 +/- 2

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12
Q

What is the average UI/MxP angle on a lateral cephalogram? (inclination of upper incisors)

A

109 +/- 6

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13
Q

What is the average LI/MxP angle on a lateral cephalogram? (inclination of lower incisors)

A

93 +/- 6

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14
Q

what is the normal LAFH/TAFH value?

A

55%

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15
Q

How do soft tissues normally present in a class II div 1 malocclusion?

A
  • incompetent lips
  • lower lip trap
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16
Q

How can an anterior oral seal be achieved in a normal occlusion?

A
  • lip to lip seal by circum-oral musculature
  • mandible postured to allow lips to meet
17
Q

What is a lip trap?

A

lower lip drawn up behind upper incisors

18
Q

What dental factors are associated with class II div 1 malocclusion?

A
  • increased overjet
  • overbite variations
  • exacerbation of gingivitis due to parted lips
19
Q

What are the occlusal features of a sucking habit?

A
  • proclination of upper anteriors
  • retroclination of lower anteriors
  • localised AOB or incomplete AOB
  • narrow upper arch
20
Q

How can a sucking habit be managed?

A
  • reinforcement techniques
  • removable appliance habit breaker
  • fixed appliance habit breaker
21
Q

What management options are available for a patient with Class II Div 1 malocclusion?

A
  1. accept
  2. attempt growth modification
  3. simple tipping of teeth
  4. camouflage
  5. orthognathic surgery
22
Q

How can you attempt to alter a patients growth modification with a class II div 1?

A
  • headgear to restrain growth of the maxilla
  • functional appliance
23
Q

What removable functional appliances are available for patients with Class II div 1?

A
  • twin-block
  • activator/bionator
  • Frankel (FRII) [soft tissue borne]
24
Q

What fixed functional appliances are available for patients with Class II div 1?

A

Herbst

25
Q

What is the aim of a functional appliance in class II div 1 patients?

A

aim to produce restraint of maxillary growth & encourage mandibular growth

26
Q

What are the potential disadvantages of early functional appliance treatment of patients with Class II div 1?

A
  • effects not maintained longterm
  • treatment time increased
27
Q

What are the potential advantages of early functional appliance treatment of patients with Class II div 1?

A
  • improve appearance earlier
  • reduce risk of trauma
  • better compliance with appliance wear
28
Q

Write the prescription for a functional appliance that retroclines anterior teeth?

A

Active = roberts retractor 0.5mm in tubing

Retention = Adams cribs 6/6 ).7mm HSSW

Anchorage = stops mesial 3/3

Baseplate = FABP (flat anterior bite plane)

29
Q

When would orthognathic surgery be carried out?

A

When growth is complete

30
Q
A

BDS4 ORTHODONTICS (12 decks)

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