3/8/17 Prescribing and reading radiographs

Question 1

What is the principle of justification in taking radiographs

Answer 1

Benefit outways risk

Question 2

What are three risks from radiology?

Answer 2

• Tissue death
• DNA damage
• Tumor development

Question 3

What is a deterministic risk?

Answer 3

-There is a threshold for damage

Question 4

If a 5 year old boy comes in to your office for his 1st visit to a dentist, his posterior teeth are in contact, has no missing teeth or decay upon exam, has a good diet and the parents are motivated towards good hygiene, what radiographs would you order?

Answer 4

-Posterior bitewing (because the proximal surfaces cannot be visualized or probed)

Question 5

If you have a 25 year old female coming in for her 6 month recall, 6 months ago you treated a fractured incisor, she has no remarkable symptoms with the incisor, no clinical caries present, low risk for caries, no periodontal disease. What radiographs should be taken?

Answer 5

• Bitewings every 24 - 36 months

- Take an anterior PA at this appt. to check the treated incisor to check healing

Question 6

If you have a 65 yr old female as a new patient that comes to your office, she has no previous radiographs available, had 2 root canals but doesn’t know which teeth, the clinical exam reveals multiple caries and missing teeth with pockets in excess of 3 mm. What radiographs do you prescribe?

Answer 6

-Full mouth series

Question 7

How long do you wash your hands?

Answer 7

15 seconds

Question 8

What does universal precautions mean?

Answer 8

Treat every patient as if they were potentially infective

Question 9

What are two ways to maintain clean surfaces in the dental operatory?

Answer 9

• Surface disinfectant

- barriers

Question 10

What is the energy “deposited” in a kilogram of a substance by the radiation known as?

Answer 10

-Absorbed dose

Question 11

What is the absorbed dose weighted for harmful effects of different radiations known as?

Answer 11

-Equivalent dose

Question 12

What is the equivalent dose weighted for susceptibility to harm of different tissues?

Answer 12

-Effective dose

Question 13

What are five organs that have high radiosensitivity?

Answer 13

• Lymphoid organs
• Bone marrow
• Testes
• Intestine
• Mucous membranes

Question 14

What are two organs of low radiosensitivity?

Answer 14

• Optic lens

- Muscle

Question 15

What are six intermediate radiosensitive organs?

Answer 15

• Fine vasculature
• Growing cartilage
• Salivary glands
• Lungs
• Kidney
• Liver

Question 16

What are the three guiding principles of radiation safety?

Answer 16

• ALARA
• Justification
• Dose limitation

Question 17

How often do dental xray units need to be inspected?

Answer 17

5 yrs

Question 18

Pulp: radiolucent or radiopaque

Answer 18

Radiolucent

Question 19

T/F The larger the crystals of silver halide the faster the film speed?

Answer 19

-True

Question 20

What are three types of digital sensors?

Answer 20

• PSP
• CCD
• CMOS