ORTHO EO exam

Question 1

what are the 3 planes of space that are assessed?

Answer 1

transverse dimension
vertical dimension
antero-posterior

Question 2

how do you assess symmetry?

Answer 2

birdseye view
worms eye view
line of fifths
true vertical

Question 3

when assessing the vertical dimension, how is the face divided?

Answer 3

thirds - upper (glabella), middle (subnasale), lower (soft tissue chin)
lower third can then be divided

Question 4

when assessing the vertical dimension, how to you assess the growth of the mandible?

Answer 4

frankfort mandibular plane angle

occiput - average
ear - increased
beyond back of head - reduced

Question 5

how does an increased frankfort mandibular plane angle affect occlusion?

Answer 5

open bite potential

Question 6

how does a reduced frankfort mandibular plane angle affect the occlusion?

Answer 6

overbite potential

Question 7

how is the downwards growth of the mandible assessed?

Answer 7

looking at the steepness of the lower border of the mandible

Question 8

when assessing antero-posterior, what method can be used?

Answer 8

Kettle’s method
place finger tips on maxilla and mandible - measure arm tilt

Question 9

what is skeletal class I?

Answer 9

maxilla and mandible orthognathic

Question 10

what is skeletal class II?

Answer 10

maxilla forward or mandible back or combo

Question 11

what is skeletal class III?

Answer 11

maxilla back or mandible forward or combination

Question 12

how do you measure lip morphology or posture?

Answer 12

lip competence
lip trap
incompetent lips

Question 13

what is lip competence?

Answer 13

lips meet together at rest

Question 14

what is lip trap?

Answer 14

lower lip stick behind upper incisors

Question 15

what are incompetent lips? and what causes them?

Answer 15

short upper lips due to proclined upper incisors

Question 16

what is the only type of malocclusion which can cause TMD and fits criteria for ortho tx?

Answer 16

cross bite with displacement