Radiology

Question 1

X-ray quality is affected by 4 elements - what are they?

Answer 1

• mA
• kVp
• Exposure time
• Source-to-film distance

Question 2

What is density?

Answer 2

• Degree of darkness
• Increase time leads Increase density

Question 3

What is contrast?

How do you control it?

Answer 3

Fewer shades of grey

Decrease kVp leads to Increase Contrast

Question 4

For endo - do you want high contrast?

If so, what is your desired kVp?

Answer 4

• High contrast (short-scale = more abrupt black-white)
• 63 - 70 kVp

Question 5

Is it better to take multiple pre-operative radiographs?

Answer 5

Yes!

According to Brynolf - increased diagnostic accuracy 90%

Question 6

What are examples of radiographic checkpoints?

Answer 6

• Pre-operative
• Augment diagnosis
• Tracing sinus tract
• Evaluate resorption, trauma, pathosis
• Working length
• Interim “check” films
• Master apical file or master GP cone
• Final obturation
• Historical reference

Question 7

What is your goal of doing an endodontic evaluation?

Answer 7

Reproduce the CC

Question 8

What do the SLOB stand for?

Answer 8

• Same Lingual Opposite Bucca
• Lingual object moves same direciton as tube head
• Buccal object moves opposite direction as tube head

* In the picture the x-ray head moved distally *

Question 9

Describe how Internal Resorption would present radiographically?

Answer 9

• Enlarged canal area
• Canal not evident through lesion
• Usually symmetrical
• Well-defined margins
• Stays centered on canal with change in horizontal angulation

Question 10

Describe how External Resorption would present on a radiograph…

Answer 10

• Canal evident through lesion
• Usually asymmetrical
• Poorly-define margins
• Shifts off canal with change in horizontal view

Question 11

What are some Advantages/Disadvantages of Digital Radiography?

Answer 11

Advantages:

• Less radiation
• Instant images
• Image processing
• No chemicals
• Data storage & transfer

Disadvantages:

• Cost
• Sensor thickness