Class II Div I

Question 1

BSI classification of Class I

Answer 1

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

Question 2

BSI Classification of Class II

Answer 2

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

Question 3

BSI Classification of Class II Div I

Answer 3

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

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

Question 4

BSI Classification of Class II Div II

Answer 4

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

Upper centrals are retroclined

OJ is reduced but can be increased

Question 5

BSI Classification of Class III

Answer 5

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

OJ is reduced or reversed

Question 6

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

Answer 6

Retrognathic mandible

Question 7

Average maxillary incisor inclination

Answer 7

110

Question 8

What does SNA relate to?

Answer 8

Position of maxilla to anterior cranial base

Question 9

What does SNB relate to?

Answer 9

Position of mandible to anterior cranial base

Question 10

How do we work out the ANB

Answer 10

SNA-SNB

Question 11

Average mandibular incisor inclination

Answer 11

90

Question 12

Average FMPA

Answer 12

28

Question 13

Average LAFH: TAFH

Answer 13

55%

Question 14

Why are lips often incompetent in Class II Div I

Answer 14

Prominent upper incisors and/or underlying skeletal pattern

Question 15

Occlusal features of thumb sucking habit

Answer 15

Proclined upper anteriors

Retroclined lower anteriors

AOB

Posterior xbite

Narrow arch

Question 16

Function of headgear

Answer 16

Attempt to restrain growth of maxilla horizontally and/or vertically

Question 17

Growth modification treatment options

Answer 17

Headgear
Functional appliance

Question 18

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

Answer 18

Mostly Class II div I

Question 19

How do functional appliances work?

Answer 19

Aim to restrain maxillary growth and encourage mandibular growth

Question 20

Examples of functional appliances

Answer 20

Twin block
Frankel II

Question 21

What age should we use functional appliances?

Answer 21

Early use - about 10yrs

Question 22

Potential disadvantages of early treatment with functional appliances (2)

Answer 22

Effects may not be maintained long term

Overall tx time increased 3 phase tx

Question 23

Potential benefits of early treatment with functional appliances

Answer 23

Improved aesthetics earlier
Reduce risk of trauma

Often better compliance with appliance wear

Question 24

Draw a URA design for retroclining anterior teeth

Answer 24

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 mesial to 3’s

B: FABP OJ+3mm

Question 25

What jaw does orthognathic surgery usually include?

Answer 25

Usually mandibular

Question 26

When are fixed appliances required for Orthognathic surgery

Answer 26

Before, during, after

Question 27

Process of orthognathic surgery for Class II Div I

Answer 27

Maxillary impaction Mandibular advancement

Question 28

Process of orthognathic surgery for class III

Answer 28

Maxillary advancement Mandibular impaction