Chapter 34

Question 1

Periodontal disease

Answer 1

Affects both hard and soft tissue and includes loss of bone

Question 2

Gingivitis

Answer 2

Affects only soft tissue

Question 3

Radiograph of the supporting bone

Answer 3

Allows views of interseptal bone and crystal bone to be assessed

Question 4

Bone loss is defined as

Answer 4

Horizontal or vertical or a combination of both

Question 5

Horizontal bone loss

Answer 5

Loss of bone around the teeth in an entire region around several teeth with both buccal and lingual bone lost parallel to the CEJ. Bone has receded fairly evenly like a tide

Question 6

Vertical bone loss

Answer 6

Loss of bone at an angle to the tooth - it often forms a V next to the tooth with the bone slanted downward creating a pocket next to the tooth

Question 7

Furcation bone loss or involvement

Answer 7

Loss of bone between the roots of multi-rooted teeth

Question 8

Predisposing factors

Answer 8

Restoration overhangs
Poorly contoured restoratons
Poorly contacting natural teeth
Plunger cusps
Calculus build-up 
Occlusal trauma

Question 9

Occlusal trauma

Answer 9

Includes such things as osteosclerosis, hypercementosis, triangulation of bone left between the teeth, widened PDL, and other RO in bone

Question 10

Anatomical configurations

Answer 10

Root morphology
Relationship of a tooth’s roots to the adjacent tooth
Sinus location
Mandibular canal location

Question 11

What kind of tissues are not imaged in radiographs

Answer 11

Soft

Question 12

Radiographs cannot distinguish between

Answer 12

Active periodontal disease vs. periodontally treated surgical procedures

Question 13

Vertical BW’s

Answer 13

More useful for examining periodontium than horizontal BW’s

Question 14

Faulty horizontal angulation

Answer 14

The cause of overlap between the teeth and renders the radiograph fairly useless for caries detection

Question 15

Too much vertical angulation

Answer 15

Does not reveal crestal bone

Question 16

Too little angulation

Answer 16

Falsely indicates bone loss

Question 17

Gingivitis

Answer 17

Case Type I

Question 18

Chronic periodontitis

Answer 18

Case Type II

Question 19

Moderate chronic or aggressive periodontitis

Answer 19

Case Type III

Question 20

Advanced Chronic or Aggressive periodontitis

Answer 20

Case Type IV

Question 21

Case Type I

Answer 21

Should appear normal on radiographs
Lamina dura should be intact and unbroken. The alveolar crest should be 1 to 1 1/2mm apical to CEJ with points between the teeth inter proximally. The PDL should be a thin RL line between tooth and bone

Question 22

Case Type II

Answer 22

Early bone loss of up to 30%
Radiographs will show a “cupping” out of crestal bone, blunting of the inter proximal points and a triangulation of the PDL

Question 23

Case Type III

Answer 23

Moderate bone loss of 30-50%

Severe vertical and/or horizontal bone loss with RL in the furcations

Question 24

Case type IV

Answer 24

More than 50% bone loss
Severe vertical and/or horizontal bone loss with furcation involvement. Thickened periodontal membrane causes changes in tooth position