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ROENT > LECTURE 4: INTRAORAL RADIOGRAPHY > Flashcards

LECTURE 4: INTRAORAL RADIOGRAPHY Flashcards

1
Q

radiographic procedures where the film is placed inside the mouth to make exposure or a radiograph

A

INTRAORAL RADIOGRAPHY

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2
Q

types of INTRAORAL RADIOGRAPHY

A

o periapical technique
o bitewing technique
o occlusal technique

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3
Q

PERIAPICAL TECHNIQUE
can be either?

A

o paralleling technique
o bisecting technique

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4
Q

PARALLELING TECHNIQUE
also known as?

A

o extension cone technique
o right angle technique
o long cone technique

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5
Q

True or false

film position in the mouth is parallel to the long axis of the tooth to be radiographed

A

True

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6
Q

True or false

central ray of x-ray beam is directed parallel to film and long axis of the tooth

A

False

central ray of x-ray beam is directed perpendicular to film and long axis of the tooth

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7
Q

True or false

keep the film parallel with the long axis of the tooth

A

True

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8
Q

True or false

central beam is perpendicular to the tooth and film; film parallel to the tooth

A

True

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9
Q

True or false

Paralleling instruments with an aiming ring is doesnt needed to achieve the parallel relationship.

A

False

Paralleling instruments with an aiming ring is needed to achieve the parallel relationship.

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10
Q

LONG TARGET FILM DISTANCE

INCHES?

A

16 INCHES

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11
Q

used with paralleling technique to compensate for the image magnification

A

LONG TARGET FILM DISTANCE

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12
Q

reason why this technique is also referred to as long cone technique

A

LONG TARGET FILM DISTANCE

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13
Q

long target-film distance produces image with less image magnification and increased definition

A

LONG TARGET FILM DISTANCE

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14
Q

reason why cone is 16 inches long

A

LONG TARGET FILM DISTANCE

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15
Q

PARALLELING TECHNIQUE

LONG TARGET FILM DISTANCE

ADVANTAGES:

A

→ produces images with dimensional accuracy
→ simple and easy to learn and use
→ can be accurately repeated (easier to standardize films)
→ head position is not critical

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16
Q

PARALLELING TECHNIQUE

LONG TARGET FILM DISTANCE

DISADVANTAGES:

A

→ film placements may be difficult
→ film holding device may cause patient discomfort

17
Q

FIVE BASIC RULES of PARALLELING TECHNIQUE

A

(1) Film must cover the prescribed area of interest

(2) Film positioned parallel to the long axis of the tooth

(3) Central ray directed through the contact areas between the teeth

(4) X-ray beam centered over the film to ensure all areas of the film are exposed

18
Q

MODIFICATIONS THAT CAN CAUSE CHALLENGES in using PARALLELING TECHNIQUE

A

→ low palatal vaults
→ maxillary torus
→ mandibular torus

19
Q

based on a simple geometric principle known as rule of isometry

A

BISECTING ANGLE TECHNIQUE

20
Q

two triangles are equal if they have two equal angles and share a common side

A

BISECTING ANGLE TECHNIQUE

21
Q

Cieszynski’s rule of isometry

A

BISECTING ANGLE TECHNIQUE

22
Q

in this technique:
o film is placed along the lingual surface of the tooth

A

BISECTING ANGLE TECHNIQUE

23
Q

at point where film contacts tooth, plane of film and long
axis of tooth form an angle

A

BISECTING ANGLE TECHNIQUE

24
Q

o an imaginary bisector divides the angle in half or bisects it

A

BISECTING ANGLE TECHNIQUE

25
Q

central ray of x-ray beam is directed perpendicular to the
imaginary bisector

A

BISECTING ANGLE TECHNIQUE

26
Q

the radiographer must visualize an imaginary plane that bisects
or divides in half that angle formed by the tooth and the film

A

BISECTING ANGLE TECHNIQUE

27
Q

opposite hands for each side (both maxillary and mandibular)

A

FINGER STABILIZATION TECHNIQUE

28
Q

thumb for the upper teeth

A

FINGER STABILIZATION TECHNIQUE

29
Q

pointer finger for lower teeth

A

FINGER STABILIZATION TECHNIQUE

30
Q

True or false

In FINGER STABILIZATION TECHNIQUE,
to prevent excess bending of the film at the root apex you should apply heavy pressure at the junction of the tooth crown and gum line

A

False

to prevent excess bending of the film at the root apex you should apply light pressure at the junction of the tooth crown and gum line

31
Q

RECOMMENDED VERTICAL ANGULATION in Maxillary:

Incisors

Canines

Premolars

Molars

A

Incisors +60

Canines+50

Premolars+40

Molars+30

32
Q

RECOMMENDED VERTICAL ANGULATION in Mandibular

Incisors

A

Incisors

-15 to -25

33
Q

RECOMMENDED VERTICAL ANGULATION in Mandibular

Canine

A

-20 to -30

34
Q

RECOMMENDED VERTICAL ANGULATION in Mandibular

Premolars

A

-10 to -15

35
Q

RECOMMENDED VERTICAL ANGULATION in Mandibular

Molars

A

-5 to 0

36
Q

BISECTING ANGLE TECHNIQUE

ADVANTAGES

A

→ can be used without a film holder
→ decrease exposure time

37
Q

BISECTING ANGLE TECHNIQUE

DISADVANTAGES

A

→ image distortion
→ angulation problems

ROENT (13 decks)

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