Class 2/2

Question 0

What is the prevalence of class 2/2?

Answer 0

4.5%

Question 1

What is the definition of class 2/2?

Answer 1

The lower incisor edge lies posterior to the clingulum plateau of the upper incisors and the upper incisors are retroclined

Question 2

What are the skeletal extra oral features of class2/2?

Answer 2

Sagittal: mild skeletal class 2
Vertical: reduced ALFH and MMA
Transverse: maxillary base broad relative to mandible
Chin: well developed in relation to the slightly retrusive mandible
Profile: pleasing

Question 3

What are the soft tissue features of class 2/2?

Answer 3

Reduced face height
High Lower lip
Competent lips

Question 4

What are the dental feature of class 2/2?

Answer 4

Crowded: laterals are mesio labially rotated

Increased overbite

Question 5

What time of growth oration of people with cl,ass 2/2 have?

Answer 5

Anterior

Question 6

Why are the upper central retroclined in class 2/2 but not laterals?

Answer 6

The lower lip reclines the upper centrals but because the upper laterals are smaller they often escape the upper lower lip

Question 7

What is the overjet in class 2/2?

Answer 7

Ave
Increases
Decreased

Question 8

What is the overbite in class 2/2?

Answer 8

Often deep

Question 9

Which teeth are commonly in scissor bite?

Answer 9

Upper 4’s

Question 10

What is the molar relationship often like in class 2/2?

Answer 10

Often class 2

Question 11

What are the two broad treatment options for class 2/2?

Answer 11

Accept incisor relationship
Or
Correct incisor relationship to class 1 including overbite correction

Question 12

When would you accept the overbite ?

Answer 12

2/2 not severe
Overbite not traumatic
Pt understands the limit

Question 13

How do you treat the overbite in class 2/2?

Answer 13

Intrude incisors
Extrude molars
Proclined lower teeth
Surgery

Question 14

In what type of Patients is it easier to treat the overbite in?

Answer 14

Growing patients because need molars to extrude as this is easier than intruding incisors and by doing so, the patient needs to be able to accommodate this new height

Question 15

For a more stable overbite reduction what should be done regarding the interim costal angle?

Answer 15

Needs to be changes to 125-135 with 2mm overjet

Question 16

How do we manage crowding in. Class 2/2?

Answer 16

Extractions are usually avoided but of needs be then take 5 not 4
This is because want to keep incisors labially inclined to
1. Aesthetics
2. Keep lips prominent
3. Low inter incisal reduction and OB reduction

Question 17

In cases where there is minimal space required?

Answer 17

Distal movement rather than extraction to create space in the upper arch
Use head gear

Question 18

How would you treat a case where there was more crowding?

Answer 18

Extractions to create space

Question 19

What other type of appliance may you need to consider with someone of a moderate crowded class 2/2?

Answer 19

An URA to reduce the overbite and to make space for placing a lower FA

Question 20

When would you use a functional appliance in class 2/2?

Answer 20

In growing patients, may convert them to class 2/1
First URA to procline upper teeth then use Functional appliance to close over jet

Question 21

When would you use Orthognathic surgery in clas 2/2?

Answer 21

Only those that have stopped growing and the skeletal patten is severe class 2 but mandib advancement may make the chin even more prominent so may also need genioplasty