Cephalometrics Flashcards
1
Q
What does NAPog measure? (3)
A
Facial convexity/osseous profile
- increased = convex (class II)
- decreased - concave (class III)
2
Q
NAPog normal value?
A
2.5 degrees
3
Q
What does SNA measure? Value? (4)
A
- Antero-posterior (sagittal) relation between maxilla and cranial base
- 82 degrees
- increased = protrusion
- decreased = retrusion
4
Q
What does SNB measure? value? (4)
A
- Antero-posterior relation (sagittal) between mandible and cranial base
- 80 degrees
- increased = protrusion
- decreased = retrusion
5
Q
What does SND measure? (4)
A
- Antero-posterior relation (sagittal) between mandible and cranial base
- 76 degrees
- increased = protrusion
- decreased = retrusion
6
Q
What does ANB measure? Value?
A
- relation of apical bases
- 2 degrees
- increase = class II
- decrease = class III
7
Q
Mcnamara analysis? (2)
A
Geometric proportions
Between max-mandible
( McNamara triangle)
Reference Points:
Co, A, Gn, ENA y Me
8
Q
Relation b/w cranial base and max/mandible?
A
Cranial base = S-N
Reference points: A, B, D, Pog
9
Q
What does Co-A measure?
A
effective maxillary length
10
Q
What does Co-Gn measure?
A
effective mandibular length
11
Q
What does ANS-Me measure?
A
Antero-inferior facial height
12
Q
What does Nperpendicular rmeasure? (3)
A
Maxillary position
- increased = maxillary protrusion
- decreased = retrusion
13
Q
how do you measure nasolabial angle?
A
Cm -> Sn -> Ls
- 90-110 normal
- decreased = max protrusion
- increased = max retrusion
14
Q
Skeletal growth pattern ? (2)
A
Cranial base (S-N) with Go and Gn
-ex. SNGoGn & SNGn
15
Q
SNGoGn?
A
- Evaluates growth pattern (vertical-horizontal)
- 32 degrees
- increased = divergence
- decreased = convergence
