1114 Test 2

Question 1

What shape of collimator is better (less radiation)

Answer 1

Rectangular

Question 2

What is primary radiation

Answer 2

Usable radiation

Question 3

What is secondary radiation

Answer 3

Radiation that interacts with matter

Question 4

What is scattered radiation

Answer 4

Radiation that is reflected off a surface

Question 5

What’s the different between intraoral and extra oral

Answer 5

The film is placed either in or outside the mouth

Question 6

What does lightness in x rays come from

Answer 6

Underdeveloped film

Question 7

What must you and the dentist do if a patient refuses an x ray

Answer 7

Use all efforts to inform them of the risks they will endure if they do not get an x ray

Question 8

How is quality assured in dental x rays

Answer 8

Quality control tests, records, ALARA (as low as reasonably achievable)

Question 9

Describe how the wavelength determines the power of radiation.

Answer 9

The shorter the wavelength the more punch/power

Question 10

Which items have the longest and shortest wavelengths (in order)

Answer 10

Radio, microwave, sun, dental radiography

Question 11

Describe cathode and anode

Answer 11

Cathode (tungsten filament, sends electrodes), anode (target for electrodes),

Question 12

Describe the PID

Answer 12

The tube that guides the x rays, lead lined

Question 13

What are the characteristics of x rays

Answer 13

Invisible and undetectable, no mass or weight, no charge, travels at speed of light, short wavelength and high frequency

Question 14

Which cells are most affected by radiation

Answer 14

Small lymphocytes, bone marrow, reproductive cells

Question 15

Describe periapicals

Answer 15

Used for checking root health and bone loss

Question 16

Describe bitewings

Answer 16

Used to view teeth interproximally

Question 17

Describe panaramic x rays

Answer 17

For viewing wisdom teeth, jaw disorders, oral cancer or orthodontics

Question 18

What should you get the patient to do before taking x rays

Answer 18

Remove earrings, stand straight up, lift their tongue to the top of their mouth

Question 19

What sequence should you take x rays

Answer 19

Quadrant 1,3,2,4. back to front

Question 20

How are x rays measured

Answer 20

Quality (wavelength) - penetration, quantity - number of x rays, intensity - number of electrons

Question 21

Which has more shades of grey higher or lower KVP

Answer 21

Higher the kVp the more shades of grey (less contrast)

Question 22

What are the advantages of digitial radiography

Answer 22

Less radiation, more options (colors, size), no physical documents

Question 23

What information do you get from occlusal x rays

Answer 23

Root tips and stones

Question 24

What is the quality of an x ray

Answer 24

Penetration (kvp)

Question 25

What is quantity and intensity of x rays

Answer 25

The number of x rays and the number of electrons (MA)

Question 26

What are cone beam x rays used to view

Answer 26

Impacted teeth

Question 27

What are the x ray errors

Answer 27

Cone-cut (misalignment), overlapping contacts (incorrect horizontal angulation, foreshortening (excessive verticality), blurring (movement), dark (kVp is off)

Question 28

What are potential errors of panoramic x rays

Answer 28

Improper position, kept jewelry on, tongue not on palate

Question 29

Describe bitewing x ray procedure

Answer 29

Position patient, lead apron with thyroid collar, explain,

Question 30

What materials appear as light on an x ray

Answer 30

Dense material