Radiology M4 -R5 : Dental radiology techniques 2

Question 1

what does this image show

Answer 1

elongation

Question 2

what does this image show

Answer 2

fore-shortening

Question 3

why take bitewings

Answer 3

• detect caries
• monitor caries progression
• assess periodontal status
• assess exisiting restorations

Question 4

why would you opt to do a vertical bitewing instead of a horizontal

Answer 4

both techniques allow for caries assessment

where they differ is with vertical you can do a more thorough perio assessment: when you need to see more of the root and supporting bone

Question 5

what are the three positioning requirements needed before taking an x-ray

Answer 5

1. film and object parallel
2. film close to object
3. X-ray beam perpendicular to object and film

Question 6

how do we achieve good positioning

Answer 6

always use a holder: it is practically impossible to do a bitewing without one

Question 7

what is easy to miss in a radiograph through horizontal overlap

Answer 7

early carious lesions

Question 8

vertical angulation, whilst doing a vertical bitewing will cause what of the cusps

Answer 8

separation of cusps

Question 9

where does the orientation dot go

Answer 9

always to the palate

Question 10

the use of a rectangular collimator can reduce collimation by how much

Answer 10

50%