Term
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Definition
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Term
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Definition
Angle between basion-nasion and foramen rotundum-gnathion (PTM to Gn)
Avg=90
<90 is retrognathic chin
>90 is prognathic chin |
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Term
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Definition
FH to N-Pg
Measures degree of protrusion of lower jaw
Increases with age
88 degrees is normal. |
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Term
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Definition
Sot tissue tip of nose to soft tissue pogonion
Lower lip should be 2 mm behind this line for 9 year olds. |
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Term
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Definition
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Term
| Downs superimpostions on what registration point |
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Definition
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Term
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Definition
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Term
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Definition
AB- N-PG, relates dentures
Negative=class II
Positve= class III |
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Term
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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 |
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Term
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Definition
NA-APg Meeasures maxillary prognathism
Positve=class II
Negative= Class III |
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Term
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Definition
S-N
Growth pattern evaulated with GoGn to S-N |
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Term
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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 |
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Term
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Definition
FMA=25
IMPA=87
FMIA=68
FMA>30 is high angle
FMA<30 is low angle |
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Term
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Definition
Higher correlation to ANB if functional occlusal plane used in stead of bisected occlusal plane
Functional occlusal plane passes over dentition |
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Term
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Definition
| Bisects incisor overbite and psses over the distal cusps of most posterior teeth... Related to Wits |
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Term
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Definition
Mandible:
Third molar
Inner cortical plate of symphysis
Mandibular canal |
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Term
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Definition
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Term
| UFH (N-ANS) : LFH (ANS-Me) |
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Definition
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Term
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Definition
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Term
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Definition
| Lips should touch line from soft tissue Pg to middle of lwoer border of nose |
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Term
| PA ceph petrous of temporal bone |
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Definition
| is in inferior 1/3 of orbit |
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Term
| PA ceph lesser wing of sphenoid |
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Definition
| radiopaque line passing through orbits |
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Term
| PA ceph oblique line of orbit |
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Definition
Called temporal line (petrous part of temporal bone)
Formed by temporal surface of greater wing of sphenoid. |
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Term
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Definition
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Term
| Broadbent Registration point |
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Definition
DOWNS
Bolton-Nasion
Draw perpendicular from sella
Midpoint of the perpendicular line |
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