1
Q
What is a focal trough:
A
Horseshoe shaped zone where images most sharp and clear
2
Q
Condyle:
A
D is mesial
3
Q
Where is tube and detector around pt?
A
Tube always behind, detector in front
4
Q
Ghost Images?
A
Secondary image, opposite, slightly higher, bigger and fuzzier
5
Q
ERRORS:
A
- Foreign objects > ghost images
- Palatoglossal airspace
- lips open = R/L anteriors
- Head tilt = not center
- Head rotated = 1 side wider, 1 side narrower
- Head up = flat smile
- Head down = smiley
- Head forward = minimising, fuzzy, spine
- Head back = Fuzzy, larger
- Slumped spine
- Shoulder interference
- Pt movement
- Didn’t raise tongue = R/L mx roots
6
Q
Bisecting right angle technique:
A
Long axis of tooth and long axis of film - bisecting line (half btwn) - beam right angle
7
Q
Narrowing, smaller:
A
Closer to the film - outside focal trough - too anterior
Focal trough: horizontal film plate produces 1:1 ratio to offset inherent magnification.
8
Q
^ Kv63=
A
^ Contrast
9
Q
^ 8mAs=
A
^ density
10
Q
What structures go through pterygomaxillary fissure?
A
Terminal of Mx artery and Post Sup Alveolar nerve
BDS3 sem 1
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