Radiographs

Question 1

Crystal Lamina dura can tell

Answer 1

Where the bone level is

Question 2

CEJs and crest of two adjacent teeth are parallel

Answer 2

Horizontal bone loss

Question 3

CEJs and crests aren’t parallel

Answer 3

Vertical/angular bone loss

Question 4

Bone loss %

Answer 4

(CEJ-Crest-2mm)
_____________________
(CEJ-Apex - 2mm)

Question 5

Mild bone loss

Answer 5

Less than 20%

Question 6

Moderate Bone loss

Answer 6

21-49%

Question 7

Severe bone Loss

Answer 7

Over 50%

Question 8

Hemiseptal Defect

Answer 8

A vertical defect in the presence of adjacent roots; thus half of a septum remains on one tooth
-One walled defect

Question 9

A one walled defect radiographically will be

Answer 9

Completely radiolucent

Question 10

Osseous Crater

Answer 10

A type of 2 wall defect
-most common type

Bowl shaped in the intralveolar bone-can be deep or shallow

Question 11

Moat Like defect

Answer 11

An infrabony resoprtgive lesion involving one or more surface of supporting bone

“Cup” around tooth

Question 12

Furcation Bone Loss

Answer 12

Pathological resorption of bone within a furcation

Question 13

Furcation bone loss appears ____ radiographically

Answer 13

Radiolucent (black)

-place gutta purchase point on X-ray film to determine how deep it is

Question 14

Height of alveolar Crest

Answer 14

Normal height of the crest lies at the level approximately 2 mm below the levels of the CEJs of adjacent teeth

Question 15

Inflammation causes

Answer 15

Crestal Changes

Question 16

PDL space

Answer 16

Space between the tooth root and alveolar bone contains the PDL

Question 17

PDL radiographically

Answer 17

.4-1.5 mm

Question 18

The PDL tends to be wider

Answer 18

At the apex and alveolar crest and narrow in the midd root areas

Question 19

Widen PDL space can indicate

Answer 19

Bone loss

Question 20

Widened PDL space + thickened radicular Lamina dura =

Answer 20

Occlusal trauma

Question 21

If roots are less than _____ apart, periodontal bone loss will affect ________

Answer 21

2.5mm

Entire interproximal

Question 22

Normal CR ratio

Answer 22

1:2

Question 23

Adequate CR ratio

Answer 23

1:1

Question 24

CR ratio that is inadequate

Answer 24

2:1

Cannot put a crown on it, the tooth may be lost anytime