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Radiology > Quiz 3 > Flashcards

Quiz 3 Flashcards

0
Q

Theory rule

A

The central ray is directed perpendicular to an imaginary line which bisects the long axis of the tooth and the film

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1
Q

Bisection of the angle technique (BAT)

A

Based on the theory of the equilateral triangle (2 triangles have a common side and 2 equal angles are equal triangles)

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2
Q

In the room:

A

Opening of cone parallel to bisector

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3
Q

Bisecting line (imaginary line):

A

Forms a right angle with the central rays

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4
Q

Vertical angulation governed by:

A

Cone

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5
Q

Film is placed:

A

Centered over the area of interest or a specific tooth

Vertical placement of film is approx. 3mm (1/4 inch) above or below occlusal line

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6
Q

Vertical angulation

A

1) is the up and down angulation of the cone tip

2) vertical angulation is a deviation from a line parallel to the floor

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7
Q

Occlusal plane should be ______ to the floor

A

Parallel

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8
Q

Ala/tragus line also called:

A

Frankford plane

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9
Q

Ala/tragus line _____ to the floor?

A

Parallel

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10
Q

If a film holder is used vertical angulation will….

A

Decrease because tooth and film are more parallel to each other

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11
Q

Horizontal angulation rule

A

Make sure that the central rays pass through the teeth parallel to the proximal surface

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12
Q

Bite wing front and back

A

Cone 1/4 anterior to film

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13
Q

Bite wing top and bottom

A

Middle of cone at occlusal plane

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14
Q

PA front and back

A

Cone 1/4 anterior to the film

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15
Q

PA top and bottom

A

Cone 1/4 above (for mandible) or below (for maxilla) the occlusal plane

16
Q

Minimum # of films in a FMS?

A

14 to survey both arches 7 max and 7 man —-> CCP 9 max and 7 man
Bite wings should accompany PA films

17
Q

Cuspid horizontal angulation revision:

A

Between the contact point of the cuspid and 1st bicuspid to prevent overlapping

18
Q

Alternate placements of cuspid

A

Oblique film placement

Cross arch film placement

19
Q

Oblique film placement

A

Reason: due to low palate may have difficulty in placing the film high enough in the palate to record apices
Positioning: use diamond shaped positioning; edge of the film below the occlusal line more than 1/8 inch

20
Q

Cross arch film placement

A

Reason: if arch is too narrow for standard or oblique film placement
Placement: place the film on occlusal surfaces of the teeth in vertical alignment with the cuspid
Vertical angulation will increase

21
Q

Advantages of bite block holder:

A

Patient hand and finger not exposed to radiation

When patient occludes on bite block less of a chance of film moving

22
Q

Disadvantages

A

With some pt it is difficult to position

Increase discomfort

23
Q

Occlusal exposures

A

Replaces PA in anterior

24
Q

Maxillary topographical

A

Anterior exposure of the maxillary arch

25
Q

Max. topographical steps:

A 
Max arch parallel to floor
No 2 film in the mouth or occlusal film placed horizontally
White side up
Instruct pt to close 
Cone placed approx. above the bridge of the nose 
CR is directed in the center 
Vertical angulation bisects the angle
CR is at a right angle to the film
26
Q

Mandibular topographical

A

Anterior exposure of the mandibular arch

27
Q

Mandibular topographical steps

A

Plane of occlusion at 45 degree angle to floor (so radiation doesn’t hit their lap)
White side down on ant edge
Center of cone is placed at the tip of pt chin
-45 vertical angulation bisect the angle

28
Q

Cross sectional maxillary

A

Occlusal plane parallel to the floor, CR perpendicular to film

29
Q

Cross sectional exposure of mandibular arch

A

Pt is totally reclined
Occlusal film, white side down as far posterior as possible
Close
Cone places 1 inch posterior to too of the chin
Tube head angled at 0 degrees, CR at right angle to film

30
Q

Panorex views

A

Overall jaw development

Development of permanent teeth

31
Q

Endodontic exam:

A

Uses hemostat
Rinn snap a ray
Tongue depressor

32
Q

Occlusal indication

A

Anterior occlusal in place of PA to see unerupted tooth position

33
Q

Cross section exposures

A 
Impacted or supernumerary teeth 
Fractures 
Foreign bodies 
Cyst 
Odontomas- tumors 
Osteomyelitis-bone inflammation
Malignancies 
Size and shape of dental arch 
Presence of stones 
Tori
Healing of cleft palate surgery 
Retained roots 
Unerupted teeth 
Foreign particles

Radiology (9 decks)

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