L2- Extra oral exam Flashcards
symmetrty lines
Glabela- subnasale and pogonion
Glabela- subnasale
reference line in symmetry
evaluate position of chin with
pogonion line
assess midline in what view
frontal view
T/F can have symmetrical face but no symmetry
true – you can have a midline shift
vertical proportions
- basic
usually in thirds – should all be the same
lateral view is what plane
sagital plane
key area for face esthetics
inferior third of the face
key area for face esthetics
inferior third of the face
ricketts esthetic plane
tip of nose – pogonion
lower vermillion border in relation to E plane
O to +3mm from E plane
Ricketts esthetic plane affected by
tooth position and inclination
distance increases with growth or aging
naso-labial angle formed betwee
nose and upper lip
normal values of nasolabial angle
90-110 degrees
nasolabial angle affected by
LIP - upper incisors position and their incliniation
NOSE - cannot be modified with ortho
frontal view shows us
frontal - transverse plane
cephalic index - Cl
symmetry
vertical proportions
lip functin
smile esthetics
cephalic index
an anthropometric value based on the ratio between the width and length of the head
max head width X 100 DIVIDED by maximum head length
mesocephalic CI
mesoproscopic / normocephalic
CI = 79= 81
represents balanced growth and harmonic facial proportions
mesoproscopic / normocephalic
mesocephalic
CI that represents balanced growth
79-81
CI greater than 81 represents
brachycephalic / euryproscopic = SHORT WIDE FACE AND COUNTER-CLOCKWISE GROWTH
associated with deep bite
class II div 2
strong musuculature
bruxers
class II div 2 and counter clockwise grwoth considered
brachycephalic – CI> 81
CI < 79
Doluchocephalic / leptoprosopic
Doluchocephalic / leptoprosopic
CI < 79 –> CLOCKISE RITATIONAL GROWTH
clockwise rotational growth
Doluchocephalic / leptoprosopic
skeletal open bite associated with
Doluchocephalic / leptoprosopic
CI < 79
characteristics of CI < 79
- clockwise rotational gorwth
- skeletal open bite
- weaker musculatiure
- steep madibular plane
reference line for facial symmetry
Glabela- subnasale
progonion evaluates?
position of the chin
bottom 1/3 of vertical proportions
divided further into upper 1/3 and lower 2/3
the mouth should be about 1/3 of the way between the base of the nose and the chin
ideal labial / lip function
at rest –> lips in contact or slightly apart
no strain
relaxed position
normal respiration
normal swallowing
neuromuscular imbalance mouth breathing - general implicatoin
tongue thrust – anterior open bite
neuromuscular imbalance in relation to lips can lead to
lips apart at rest
lip strain to close
lip trap
mouth breathing - tongue thrust
anterior open bite
increased overjet
lateral view in what plane and proportions? plus angle
sagital plane
vertical proportions
profile analysis
NASO-LABIAL ANGLE
lip contour
lip function
profile analysis reflects ___ skeletal imbalances
Mx-Md position
dental imbalances incisor position and/or inclination
convex profile more associated with
- elaborate
retruded mandible - maybe class II - E line is closer / on top of lips
vs concave - looks more class III –> E line is far in front of the lips
___ part of face is key to facial esthetics
inferior 1/3
rickett esthetic E plane
tip of nose – Pogonion
affected by tooth position and inclination
rickett esthetic E plane - relation to lower vermillion border
0+-3 mm
distance INCREASES with growth or age
naso-labial angle normal values
90-110 degrees
angle formed between nose and upper lip
angle formed between nose and upper lip
naso-labial angle
naso-labial angle affected by
LIP – upper incisors position and inclination
NOSE– poition (can’t be modified with ortho)
lip contour ideally
‘S’ shaped curl in upper lip
ideally 3 mm in depth
depends on incisor position and inclination
lip thickness and tone
provides an attractive and young appearance
