Intro

Question 1

benefits and downsides of bitewings

Answer 1

high spatial resolution, minimal superimposition of other anatomy, fast exposure, low radiation dose per image

limited to small area, invasive for pt, difficult technique

Question 2

receptor sizes and correlating radiograph type

Answer 2

0 - anterior periapical
2 - bitewing, posterior PA
4 - occlusal

Question 3

what occurs if subject vs receptor is not perpendicular

Answer 3

subject
- image shortened

receptor
- image elongated

Question 4

focus to skin distance

Answer 4

longer fsd will reduce magnification
200mm
maintained via spacer cone

Question 5

curve of spee

Answer 5

occlusal surfaces of posteriors are not level

occlusal plane rises as you move distally

Question 6

curve of wilson

Answer 6

teeth do not sit in jaws completely vertical

maxillary - tilt buccal/labial
mandibular - molar tilt lingual

Question 7

bisecting angle technique

Answer 7

when unable to place receptor parallel to tooth

estimation of angle between long axis and receptor, bisect with imaginary line, aim perpendicular to this line

benefits = more comfortable, simpler, quicker
downsides = distortion, hard to reproduce, risk of irritating thyroid gland, altered anatomical positions

Question 8

when is a thyroid shield needed

Answer 8

maxillary occlusal radiographs

bisecting angle periapical radiographs of maxillary anterior

Question 9

types of occlusal radiographs

Answer 9

anterior oblique maxillary

lateral oblique maxillary

true mandibular

anterior oblique mandibular

Question 10

why would you use CBCT instead of occlusal radiography

Answer 10

allows structures to be viewed from any angle without distortion

visualising large lesions in jaws or alveolar fractures