ORTHO EO exam Flashcards
what are the 3 planes of space that are assessed?
transverse dimension
vertical dimension
antero-posterior
how do you assess symmetry?
birdseye view
worms eye view
line of fifths
true vertical
when assessing the vertical dimension, how is the face divided?
thirds - upper (glabella), middle (subnasale), lower (soft tissue chin)
lower third can then be divided
when assessing the vertical dimension, how to you assess the growth of the mandible?
frankfort mandibular plane angle
occiput - average
ear - increased
beyond back of head - reduced
how does an increased frankfort mandibular plane angle affect occlusion?
open bite potential
how does a reduced frankfort mandibular plane angle affect the occlusion?
overbite potential
how is the downwards growth of the mandible assessed?
looking at the steepness of the lower border of the mandible
when assessing antero-posterior, what method can be used?
Kettle’s method
place finger tips on maxilla and mandible - measure arm tilt
what is skeletal class I?
maxilla and mandible orthognathic
what is skeletal class II?
maxilla forward or mandible back or combo
what is skeletal class III?
maxilla back or mandible forward or combination
how do you measure lip morphology or posture?
lip competence
lip trap
incompetent lips
what is lip competence?
lips meet together at rest
what is lip trap?
lower lip stick behind upper incisors
what are incompetent lips? and what causes them?
short upper lips due to proclined upper incisors
