Quiz 3

Question 0

Theory rule

Answer 0

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

Question 1

Bisection of the angle technique (BAT)

Answer 1

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

Question 2

In the room:

Answer 2

Opening of cone parallel to bisector

Question 3

Bisecting line (imaginary line):

Answer 3

Forms a right angle with the central rays

Question 4

Vertical angulation governed by:

Answer 4

Cone

Question 5

Film is placed:

Answer 5

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

Question 6

Vertical angulation

Answer 6

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

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

Question 7

Occlusal plane should be ______ to the floor

Answer 7

Parallel

Question 8

Ala/tragus line also called:

Answer 8

Frankford plane

Question 9

Ala/tragus line _____ to the floor?

Answer 9

Parallel

Question 10

If a film holder is used vertical angulation will….

Answer 10

Decrease because tooth and film are more parallel to each other

Question 11

Horizontal angulation rule

Answer 11

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

Question 12

Bite wing front and back

Answer 12

Cone 1/4 anterior to film

Question 13

Bite wing top and bottom

Answer 13

Middle of cone at occlusal plane

Question 14

PA front and back

Answer 14

Cone 1/4 anterior to the film

Question 15

PA top and bottom

Answer 15

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

Question 16

Minimum # of films in a FMS?

Answer 16

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

Question 17

Cuspid horizontal angulation revision:

Answer 17

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

Question 18

Alternate placements of cuspid

Answer 18

Oblique film placement

Cross arch film placement

Question 19

Oblique film placement

Answer 19

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

Question 20

Cross arch film placement

Answer 20

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

Question 21

Advantages of bite block holder:

Answer 21

Patient hand and finger not exposed to radiation

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

Question 22

Disadvantages

Answer 22

With some pt it is difficult to position

Increase discomfort

Question 23

Occlusal exposures

Answer 23

Replaces PA in anterior

Question 24

Maxillary topographical

Answer 24

Anterior exposure of the maxillary arch

Question 25

Max. topographical steps:

Answer 25

``` 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 ```

Question 26

Mandibular topographical

Answer 26

Anterior exposure of the mandibular arch

Question 27

Mandibular topographical steps

Answer 27

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

Question 28

Cross sectional maxillary

Answer 28

Occlusal plane parallel to the floor, CR perpendicular to film

Question 29

Cross sectional exposure of mandibular arch

Answer 29

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

Question 30

Panorex views

Answer 30

Overall jaw development | Development of permanent teeth

Question 31

Endodontic exam:

Answer 31

Uses hemostat Rinn snap a ray Tongue depressor

Question 32

Occlusal indication

Answer 32

Anterior occlusal in place of PA to see unerupted tooth position

Question 33

Cross section exposures

Answer 33

``` 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 ```