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Cephalometrics
Cephalometric flash cards
25
Other
Professional
04/14/2011

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Cards

Term
Ricketts Reference plane
Definition
Frankfort Horizontal
Term
Rickets Facial Axis
Definition
Angle between basion-nasion and foramen rotundum-gnathion (PTM to Gn)

Avg=90
<90 is retrognathic chin
>90 is prognathic chin
Term
Ricketts Facial Angle
Definition
FH to N-Pg
Measures degree of protrusion of lower jaw
Increases with age
88 degrees is normal.
Term
Ricketts E line
Definition
Sot tissue tip of nose to soft tissue pogonion

Lower lip should be 2 mm behind this line for 9 year olds.
Term
Downs Reference Plane
Definition
Frankfort Horizontal
Term
Downs superimpostions on what registration point
Definition
Broadbent
Term
Downs Facial Plane
Definition
N-PG
Term
Downs AB to Facial plane
Definition
AB- N-PG, relates dentures

Negative=class II
Positve= class III
Term
Downs Y axis
Definition
FH-SGn (smaller angle)
Average= 60 degrees
Indicates degree of downward, rearward or forward position of chin in relation to upper face
Larger in Class II than class III

If angle decreases during class II treatment, good result or good growth
Term
Downs Angle of Convexity
Definition
NA-APg Meeasures maxillary prognathism

Positve=class II
Negative= Class III
Term
Steiner Reference plane
Definition
S-N
Growth pattern evaulated with GoGn to S-N
Term
Steiner incisor position
Definition
U1 to NA: U1 should be 4 mm in front of NA
L1-NB: L1 should be 4 mm in front of NB as should Pg
Term
Tweed Triangle
Definition
FMA=25
IMPA=87
FMIA=68
FMA>30 is high angle
FMA<30 is low angle
Term
Wits
Definition
Higher correlation to ANB if functional occlusal plane used in stead of bisected occlusal plane

Functional occlusal plane passes over dentition
Term
Downs Occlusal plane
Definition
Bisects incisor overbite and psses over the distal cusps of most posterior teeth... Related to Wits
Term
Superimpositions
Definition
Mandible:
Third molar
Inner cortical plate of symphysis
Mandibular canal
Term
Articulare-PTM
Definition
Short= retrognathia
Term
UFH (N-ANS) : LFH (ANS-Me)
Definition
Should be 45:55
Term
AFH (N-Me) to PFH (S-Go)
Definition
Should be 60:40
Term
Steiner's S-line
Definition
Lips should touch line from soft tissue Pg to middle of lwoer border of nose
Term
PA ceph petrous of temporal bone
Definition
is in inferior 1/3 of orbit
Term
PA ceph lesser wing of sphenoid
Definition
radiopaque line passing through orbits
Term
PA ceph oblique line of orbit
Definition
Called temporal line (petrous part of temporal bone)

Formed by temporal surface of greater wing of sphenoid.
Term
Basion
Definition
on occipital bone
Term
Broadbent Registration point
Definition
DOWNS
Bolton-Nasion
Draw perpendicular from sella
Midpoint of the perpendicular line
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