Ortho Assessment

Question 1

What are the 3 methods to measure skeletal bases

Answer 1

AP
Vertical
Tranverse

Question 2

How do we assess the skeletal bases

Answer 2

AP
2 fingers
Class I - maxilla 2-3mm in front of mandible
Class II - maxilla >2-3mm in front of mandible
Class III - mandible in front of maxilla

Vertical
FMPA
Increased if lines meet before back of head
Decreased if lines don’t meet at back of head

Transverse
Asymmetry

Question 3

Soft tissue assessment (4)

Answer 3

Smile line
Nasolabial angle
Lip trap

Question 4

What do we assess I/O

Answer 4

Teeth quality/quantity/caries
Incisor relationship - proclined/retroclined
Canine relationship
Molar relationship
Xbites
Crowding
<4
4-8
>8
Centrelines
OB/OJ

Question 5

Define incisor class I

Answer 5

Lower incisors occlude with cingulum plateau of uppers

Question 6

Define incisor class II

Answer 6

Lower incisors lie posterior o cingulum plateau of uppers

Question 7

Define incisor class II div I

Answer 7

Lower incisors lie posterior to cingulum plateau of uppers
Uppers proclined
Increased OJ

Question 8

Define incisor class II Div II

Answer 8

Lower incisors lie posterior to cingulum plateau of uppers
Uppers retroclined
OJ inc or dec

Question 9

Define incisor class III

Answer 9

Lower incisors lie anterior to cingulum plateau of uppers
OJ reduced or reversed

Question 10

Define canine class I

Answer 10

Upper canine lies posterior to lower canine

Question 11

Define canine class II

Answer 11

Upper canine lies anterior to lower canine

Question 12

Define canine class III

Answer 12

Upper canine v posterior to lower

Question 13

Define molar class I

Answer 13

MB cusp of U6 lies in buccal groove of L6

Question 14

Define molar class II

Answer 14

MB cusp of U6 lies anterior to buccal groove of L6

Question 15

Define molar class III

Answer 15

MB cusp of U6 lies posterior to buccal groove of L6