BDA Radiography and Radiology Test
Questions and Correct Answers
Question 1
What is the vertical and horizontal positioning for maxillary incisors ? Bisected angle
Correct Answer
Vertical - 90 degrees to the bisected line forming a 45 degree angulation
Horizontal- X-ray beam aimed directly between incisors
Question 2
For pa anterior teeth the long axis of the film needs to be
Correct Answer
Vertical
Question 3
What part of the tooth does the image receptor touch for bisected angle technique
Correct Answer
Incisol edge 2-3mm beyond the incisal edge as well
Question 4
Clinical indications for periapical paralleling technique ? There's 7
Correct Answer
1- apical infection
2-periodontal tissues
3- trauma to teeth & bone
4- root numbers and shape before XLA
5-before during and after endo
6-before and after apical surgery
7-post op and evaluation of implants
Page 1 of 11
, Question 5
Vertical angulation and horizontal for upper premolars
Correct Answer
Vertical - 40 degrees shallow and 90degrees to bisected angle
Horizontal - X-ray beam centred on premolars
Question 6
Why is a thin sheet of lead foil placed behind the film?
Correct Answer
To stop residual radiation going further into pt tissues
To stop secondary radiation from scattering back onto film and degrading the
image
If film was placed wrong way in pts mouth the lead foil would show on radiograph
making the fault easily identified
Question 7
What dose is the actual dose patients are interested in?
Correct Answer
Effective dose
Question 8
How often should a coin test be done
Correct Answer
At least once a year
Question 9
Definition of paralleling technique
Correct Answer
Image receptor parallel to the long axis of the tooth and X-ray beam at right angles
to tooth and image receptor
Page 2 of 11
Questions and Correct Answers
Question 1
What is the vertical and horizontal positioning for maxillary incisors ? Bisected angle
Correct Answer
Vertical - 90 degrees to the bisected line forming a 45 degree angulation
Horizontal- X-ray beam aimed directly between incisors
Question 2
For pa anterior teeth the long axis of the film needs to be
Correct Answer
Vertical
Question 3
What part of the tooth does the image receptor touch for bisected angle technique
Correct Answer
Incisol edge 2-3mm beyond the incisal edge as well
Question 4
Clinical indications for periapical paralleling technique ? There's 7
Correct Answer
1- apical infection
2-periodontal tissues
3- trauma to teeth & bone
4- root numbers and shape before XLA
5-before during and after endo
6-before and after apical surgery
7-post op and evaluation of implants
Page 1 of 11
, Question 5
Vertical angulation and horizontal for upper premolars
Correct Answer
Vertical - 40 degrees shallow and 90degrees to bisected angle
Horizontal - X-ray beam centred on premolars
Question 6
Why is a thin sheet of lead foil placed behind the film?
Correct Answer
To stop residual radiation going further into pt tissues
To stop secondary radiation from scattering back onto film and degrading the
image
If film was placed wrong way in pts mouth the lead foil would show on radiograph
making the fault easily identified
Question 7
What dose is the actual dose patients are interested in?
Correct Answer
Effective dose
Question 8
How often should a coin test be done
Correct Answer
At least once a year
Question 9
Definition of paralleling technique
Correct Answer
Image receptor parallel to the long axis of the tooth and X-ray beam at right angles
to tooth and image receptor
Page 2 of 11
