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Periodontal Disease > 2: Radiographic Examination > Flashcards

2: Radiographic Examination Flashcards

1
Q

What radiological feature is the reference to determine bone loss?

A

CEJ

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2
Q

T/F. Radiographs are diagnositic of periodontal disease.

A

False, they are not. they are used to correlate with clinical attachment level (CAL)

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3
Q

How is bone loss percentage determined?

A

bone loss % = CEJ-Crest - 2mm / CEJ-Apex - 2mm

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4
Q

The ___ of the beam can affect reading of bone levels.

A

angulation

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5
Q

Mild bone loss is ≤ ___%. Moderate bone loss is ___% to ___%. Severe bone loss is ≥ ___%.

A

20; 21; 49; 50

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6
Q

The height of the crest lies at a level approximately ___mm below the level of the ___ of adjacent teeth.

A

2l; CEJs

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7
Q

What does normal crest follow?

A

the CEJ

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8
Q

T/F. Inflammation does not destroy crestal bone.

A

False, it does

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9
Q

What is the integrity of the crestal lamina dura not related to if evaluated on either PA or bite-wing radiographs?

A
  • presence or absence of visual inflammation
  • BOP
  • periodontal pocketing
  • loss of connective tissue attachment in the corresponding interdental area.
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10
Q

Is it appropriate to use the integrity of crestal lamina dura as an indicator for the need of periodontal treatment?

A

No

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11
Q

Which is parallel to the CEJ, angular (vertical) bone loss or Horizontal bone loss?

A

Angular (vertical) bone loss is diagnoal NOT parallel to the CEJ

Horizontal bone loss is parallel to the CEJ

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12
Q

T/F. Osseous defects may be noted by the number (1-3) of remaining walls. This may or may not be seen on radiographs.

A

True.

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13
Q

Describe a hemiseptal defect.

A

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

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14
Q

What is a cup- or bowl-shaped defect in the interalveolar bone?

A

crater

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15
Q

Osseous ___ are found on the buccal and lingual walls forming a ___-walled defect.

A

craters; two

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16
Q

What is a shallow crater an indicator for?

A

osseous surgery

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17
Q

T/F. Craters show-up on perioapical film but they might not be seen on BW.

A

True

18
Q

What is an intrabony resorptive lesion involving one or more surfaces of supporting bone?

A

moat-like defect

19
Q

How does pathologic resorption of bone within a furcation show up radiographically ?

A

as radiolucency (furcation radiolucency)

this may be seen on BW or PA

20
Q

Furcation involvement can be detected by ___-___ point on X-ray film.

A

gutta-percha

21
Q

If a patient complains of pain from an endo treated tooth, what may be the problem?

A

root fracture

22
Q

What is the space between the tooth root and alveolar bone containing the periodontal ligament?

A

PDL space

23
Q

The PDL appears as the PDL space of ___mm to ___mm on radiographs. It tends to be ___ at the apex and ___ ___ and ___ in the mid-root areas.

A

4.0; 1.5; wider; alveolar crest; narrow

24
Q

What is seen with a thickened radicular lamina dura? What is the cause?

A
  1. widened PDL space due to occlusal trauma
25
Q

Describe the trabecular pattern and gradient.

A

more trabeculae superiorly and anteriorly

26
Q

T/F. A more loose pattern of trabeculae can be seen in sickle cell anemia.

A

True.

27
Q

What are the two types of trabecular variations?

A

rarified and dense

28
Q

How are vessels within interdental bone describe on radiographs?

A

radiolucent lines bordered by thin radiopaque lines

29
Q

T/F. If the frontal sinus is close to or has invaginated among the roots of the maxillary teeth, there may be difficulties with surgical treatment of the periodontal problems (fistula).

A

False, If the MAXILLARY sinus is close to or has invaginated among the roots of the maxillary teeth, there may be difficulties with surgical treatment of the periodontal problems (fistula).

30
Q

A mandibular tori is a bony ___ on the ___ aspect of the mandible generally in the ___-___ region. It is seen as a radiopacity and commonly found bilaterally.

A

exostosis; lingual; premolar-molar

31
Q

Where can the mental foramen be seen?

A

as far forward as the distal of the 1st premolar and as far posteriorly as the mesial of the 1st molar

32
Q

How far apart must the roots be to have periodontal bone loss that affects the entire interproximal?

A

less than 2.5mm

33
Q

Define the crown to root ratio.

A

The ration of the length of the tooth outside of bone to the length of tooth in bone.

34
Q

T/F. The crown to root ration is not a linear measurement and takes into account other morphologic factors such as root number and shape.

A

False, The crown to root ration IS a linear measurement and DOES NOT take into account other morphologic factors such as root number and shape.

35
Q

Match

  1. C:R = 1:2
  2. C:R = 2:1
  3. C:R = 1:1

A. Favorable
B. Adequate
C. Unfavorable

A

1 - A
2 - C
3 - B

36
Q

A periapical radiolucency might continue to develop a ___.

A

pocket

37
Q

___ tooth resorption begins from within the pulp.

A

Internal

38
Q

___ tooth resorption begins on the external surface.

A

External

39
Q

T/F. Bite registrations are used to standardize the projection.

A

true.

40
Q

What is used to assess the marginal bone changes around a dental implant?

A

digital subtraction radiography (DSR)

41
Q

How should an implant appear on a PA film if done correctly?

A

sharp threads with no overlaps on either side of implant indicates that the image is adequate to be used for assessment of the peri-implant bone conditions

42
Q

What technique visibly shows the sinus septum?

A

CBCT(easier to see) vs panoramic

Periodontal Disease (11 decks)

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