OSCE

Question 0

How much bone should be visible around the apex of the tooth in a PA?

Answer 0

2-3mm

Question 1

How many images are in an adult full mouth series?

Answer 1

19

Question 2

What are the landmarks that must be included in a successful premolar bite wing?

Answer 2

Distal of both canines, max and mand bone levels, majority of contacts open

Question 3

What landmarks must be included in a successful molar bite wings?

Answer 3

Distal surface of most distal fully erupted tooth, max and mand bone levels, majority of contacts open

Question 4

What is the vertical angular of the BID for bitewings with tabs?

Answer 4

+5-8 degrees (down)

Question 5

What are three indications for PA examinations?

Answer 5

1) to examine the PA tissues for pathology
2) to assess caries extent
3) to assess bone levels

Question 6

In bisecting angle technique, what would cause foreshortening of the image?

Answer 6

Too steep vertical angular

Question 7

What would cause elongation while using bisecting angle technique?

Answer 7

Too flat or shallow vertical angulation

Question 8

What are the vertical angulations for anterior PAs (both max and mand)?

Answer 8

Mand - -15 to -20 degrees

Max - +40 - +50 degrees

Question 9

What is the vertical angulation for max and mand posterior PAs with bisecting angle technique?

Answer 9

Max: +20-+40 degrees
Mand: -20 to -40 degrees

Question 10

How should you position the BID using bisecting angle?

Answer 10

3/4 above bite block, 1/4 below

Question 11

Which direction should the size 4 plate be inserted for a maxillary standard occlusal?

Answer 11

Crosswise

Question 12

Which direction should the size 4 plate be inserted for a maxillary anterior occlusal?

Answer 12

Lengthwise

Question 13

Which direction should the size 4 plate be inserted for a maxillary lateral occlusal?

Answer 13

Lengthwise, rotated toward area of interest

Question 14

Which direction should the size 4 plate be inserted for a mandibular anterior occlusal?

Answer 14

Lengthwise

Question 15

Which direction should the size 4 plate be inserted for a mandibular true occlusal?

Answer 15

Crosswise

Question 16

What vertical angulation should be used while taking a max standard occlusal?

Answer 16

+70 through bridge of nose

Question 17

What vertical angulation should be used while taking a maxillary anterior occlusal?

Answer 17

+60 through tip of nose

Question 18

What vertical angulation should be used while taking a maxillary lateral occlusal?

Answer 18

+60 through outer can thus of eye

Question 19

What vertical angulation should be used while taking a mandibular anterior occlusal?

Answer 19

-30 (with head tipped back 30= -60 degrees)

Question 20

What vertical angulation should be used while taking a mandibular true occlusal?

Answer 20

0 degrees with occlusal plane perpendicular to the floor

Question 21

Name 3 indications for use of occlusal technique.

Answer 21

• examine large areas of upper and lower jaw when area of interest is larger than a PA image
• when a patient can’t tolerate PAs
• locating impacted teeth and roots
• assessing the extent of lesions
• evaluating fractures
• assessing changes in the size and shape of mandible
• locating foreign body
• examine the floor of mouth

Question 22

The max or peak voltage that is used during an x-ray exposure defines what?

Answer 22

Kilo voltage peak

Question 23

What describes the intensity if electrical current?

Answer 23

Milliamperes

Question 24

Is kVp or mA responsible for quality control of X-rays?

Answer 24

KVp

Question 25

How do you increase energy of X-ray beam without increasing energy of X-ray beam?

Answer 25

Increase mA

Question 26

How do you schedule radiographs for a new patient?

Answer 26

Individualized

Question 27

Recall child with high caries risk. What's the required frequency of rads?

Answer 27

6-12 months

Question 28

Recall adolescent with low caries risk requires radiographs how often?

Answer 28

18-36 months

Question 29

What are the frequencies of rads for adults, both high and low caries risk?

Answer 29

High - 6-18 months | Low - 24-36 months

Question 30

What are lateral cephs used to assess?

Answer 30

- ortho/orthographic surgery planning - soft tissues of the face - bones of skull and face - trauma an disease