Exam 1.1: Intraoral Radiography Flashcards Preview

D2: 621 Radiology > Exam 1.1: Intraoral Radiography > Flashcards

Flashcards in Exam 1.1: Intraoral Radiography Deck (53)
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1

What are the 3 types of images taken with the film inside the oral cavity?

PA
BWX
Occlusals

2

What are three criteria for PAs

Include entire tooth and 2-3 mm of apical bone
Minimal distortion
Adequate constrast/density

3

What are some criteria for a diagnostic BWX

Open interproximal areas
Equal distribution

4

What are the 2 types of images taken with film outside the mouth?

Pan
Ceph

5

What are the 4 "Special" types of radiographic images

MRI
CT
Ultrasound
CBCT

6

What is the best beam geometry possible?

Anatomy and film parallel to each other with the beam perpendicular to both

7

What can affect the size of the tooth on the image?

distance between the film and the anatomy

8

If you want to magnify the image, would you move the film closer to the tooth, or further away?

Further away

9

So why do we want the film as close to the anatomy as possible?

So that the tooth is very close to its actual size

10

What happens when you move the xray source away from the film?

Smaller anatomy and sharper detail

11

What happens to the image when the vertical angulation is off?

Foreshortening
Elongation

12

What happens to the image when the horizontal angulation is off?

Distortion in the horizontal dimension
Superimpositon/overlapping of anatomy

13

What can cause the same image distortion as horizontal angulation error?

Teeth out of alignment

14

What is the first film placement technique of choice?

Paralleling Technique

15

What axis is the film placed parallel to in the paralleling technique?

The true axis, not just the clinical crown

16

What is the only region of the mouth that you can physically touch the film to the teeth being imaged?

Posterior mandibular

17

What are the advantages of the paralleling technique

Minimized geometric distortion
True anatomic relationships
Minimized magnification

18

What are three disadvantages of the paralleling technique

Object-film distance
Can be difficult to place for views of 3rd Molars
Tough with short palatal vaults

19

When is it ok to use the bisecting angle technique instead of the paralleling technique?

Only in certain situations, most commonly when the patient cannot tolerate the paralleling technique

20

How is the beam aimed when using the bisecting angle technique?

Beam is directed perpendicular to a line bisecting the angle formed by the long axis of the tooth and the plane of the film

21

What type of distortion occurs when using this technique

Foreshortening due to the film being pulled against teeth which alters the object to film distance along the true axis of the tooth

22

Where does most of the distortion occur when using the bisecting angle technique...the crown or the root apicies?

Crown

23

What are some advantages of the bisecting techniqe

Avoids gag reflex
Avoids tongue
Avoids tori
Usable in short vaults
Capture long apicies

24

What are the disadvantages of the bisecting technique?

Inherent distortion
Difficult to place properly
Limited clinical application

25

How many films are in an FMX?

18
14 PAs
4 BWX

26

Why would a FMX be ordered?

Rampant caries or the evaluation of bone levels

27

How many teeth must be in contact with bite block when taking PAs

At least 2

28

What teeth must be included in a maxillary molar PA?

The molars (or molar area if teeth are missing) and the distal of the 2nd premolar if possible

29

For a Maxillary Molar PA how would the film be placed for using the paralleling technique?

Film in midline and pushed all the way back

30

What size film would be used for a maxillary molar PA

#2