Radiology

Question 1

when are horizontal bitewings ordered?

Answer 1

patient has suspected mild to moderate horizontal bone loss

Question 2

what can the clinician expect to see in a horizontal bitewings?

Answer 2

• superimposition of the buccal and lingual cusps
• sharp or well defined alveolar crestal margin
• no horizontal overlap between adjacent teeth

Question 3

when are vertical bitewings ordered?

Answer 3

moderate to severe horizontal bone loss, patient demonstrates deep probing depths

Question 4

downfall of periapical radiographs?

Answer 4

distort the distance between the alveolar osseous crest and CEJ compared to bitewing

Question 5

what is the most realistic image to evaluate the level of alveolar bone?

Answer 5

long cone paralleling technique

Question 6

when does the shape interdental septum appear to be angulated?

Answer 6

when the crest of the interdental bone is different than the level of CEJ

Question 7

what is the approximate measure of the CEJ to the crest of bone at each tooth surface?

Answer 7

1.5-2.0 mm

Question 8

what causes a widening of the the periodontal ligament?

Answer 8

occlusal trauma

Question 9

is the PDL radiopaque or radiolucent?

Answer 9

radiolucent

Question 10

radiopaque vs radiolucent?

Answer 10

radiopaque = inhibits passage of x-ray thus it is dark
radiolucent = permits passage of x-ray and it is lighter

Question 11

what percent of bone mineral density is lost before it is detected radiographically

Answer 11

30%

Question 12

True or False. radiographs show the amount of bone remaining rather than the amount lost

Answer 12

true

Question 13

where do furcation involvements most often occur?

Answer 13

mandibular molars

Question 14

where are most enamel pearls located?

Answer 14

maxillary third> second> first

Question 15

what can cervical enamel pearls cause?

Answer 15

bone loss