ceph measurements

Question 1

Po

Answer 1

Porion - most superior midpoint of ex auditory meatus

bilateral

Question 2

EAM vs IAM

Answer 2

EAM - elliptical, same level as mand condyle, same vert plane as basion and odontoid process of vert
IAM - round, lies post and sup to EAM

Question 3

S

Answer 3

Sella - center of pit fossa

midsaggital

Question 4

N/Na

Answer 4

Naison - intersention of internasal and frontonasal sutures

midsaggital

Question 5

Or

Answer 5

Orbitale - lowest point on inf orbital margin

bilateral

Question 6

ANS

Answer 6

Ant Nasal Spine - tip of the bony anterior nasal spine at the inf margin of the piriform aperture
midsaggital

Question 7

PNS

Answer 7

Post Nasal Spine - most post point on the bony hard palate in the midsaggital plane
jct of the hard and soft palate

Question 8

PTM

Answer 8

Pterygomaxillary fissure - bilateral inverted teardrop radiolucency at inferior point of fissure

Question 9

Point A

Answer 9

deepest point of the curvature bt ANS and Pr

midsaggital

Question 10

Point B

Answer 10

Deepest point on curvature of mand bt Id and Po

midsaggital

Question 11

Pog/P/Pg

Answer 11

most ant pont of the contour of the bony chin in midsaggital plane
(draw a perp line to mand plane, tangent to chin

Question 12

Gn

Answer 12

Gnathion - Most ant inf point on bony chin

midsaggital

Question 13

Me

Answer 13

Menton - Most inf point of mand symphysis

midsaggital

Question 14

Go

Answer 14

Gonion - most post inf point on outline of angle of mandible

bisect angle formed by intersection of mand plane and ramal plane and by extending bisector

Question 15

Co

Answer 15

Condylion - most sup post point on head of mand condyle

bilateral

Question 16

Ba

Answer 16

Basion - most ant inf point on margin of the foramen magnum

midsaggital

Question 17

FH line

Answer 17

lowest point on floor of orbit and hiest point on margin of EAM
connects Po and Orbitale

Question 18

SN line

Answer 18

connects S and Na that represents the cranial base (6-7 degrees from FH)

Question 19

N-A plane

Answer 19

from Nasion to Point A

Question 20

N-B Plane

Answer 20

from Nasion to Point B

Question 21

MP

Answer 21

Mandibular Plane - passes through mand borders

joins Go and Gn, or post aspect of low mand border form Me

Question 22

SNA

Answer 22

Angle used to measure for the assessment of the antpost position of the max with regards to the cranial base

Question 23

SNB

Answer 23

Angle used to evaluate the antpost position of the mand in relation to the cranial base

Question 24

ANB

Answer 24

SNA-SNB; evauates the antpost relationship bt the max and mand apical bases

Question 25

t/f ANB eliminates the Sella position and compares the max to the mand

Answer 25

true

Question 26

Y axis

Answer 26

line connecting S to Gn and can evaluate the direction of mand growth compared to the FH

Question 27

Interincisal Angle

Answer 27

angle made from lines bisecting the mand incisor and max incisor

Question 28

NLA

Answer 28

intersection of line tangent to the columella of the nose and line from subnasale to the mucocutaneous border of the upper lip
degree of prostrusion/retrusion of the upper lip (influenced by the max incisor)

Question 29

S line

Answer 29

line from the nostril to the Po

lips should fall on this line

Question 30

E plane

Answer 30

line tangent to chin and nose for assessment of lip fullness

lower kip should lie slightly ahead of upper lip

Question 31

what does SN line look at

Answer 31

superimposition on SN line examines changes in mand and max jaw

Question 32

what does palatal plane look at

Answer 32

superimposition on palatal plane looks at max teeth in relation to maxilla

Question 33

what does low border of the mand look at

Answer 33

superimposition looks at the change in mand teeth in relation to the mand