Deck 10: Accessory Radiographic Techniques: Bisecting Technique and Occlusal Projections

Question 1

Occlusal films can be processed in the darkroom,with similar technique to standard intraoral films.The exposure times of occlusal films are equivalent to that which is used for the maxillary molar intraoral periapical projection.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second statement is false.
D)The first statement is false,the second statement is true.

Answer 1

Both statements are true.

Question 2

When exposing the mandibular incisors with the bisecting technique,the vertical angulation should be preset at:

A)-5 degrees.
B)-15 degrees.
C)-20 degrees.
D)+30 degrees.

Answer 2

-20 degrees.

Question 3

In the bisecting technique,the tooth-receptor distance is:

A)minimal.
B)maximal.
C)not important.
D)None are correct.

Answer 3

minimal.

Question 4

In the bisecting technique,the receptor is held away from the tooth as much as possible without bending the receptor.The long axis of the receptor therefore is not parallel to the long axis of the tooth.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.

Question 5

Where is the central ray directed for or maxillary central/lateral projection with the bisecting technique?

A)Just below the midpoint of the nares (the nostrils).
B)Through the zygomatic arch at the center of the receptor.
C)At the base of the lateral nasal groove,aimed at the center of the receptor.
D)At the most anterior part of the cheekbone,aimed at the center of the receptor.

Question 6

Shorter exposure times can be used for the bisecting technique because of the shorter FFD.

Question 7

The finger holding method should be used with the bisecting technique.

Question 8

A -5 degree vertical angulation for the lower incisors will produce a(an)foreshortened image.

Question 9

When compared with periapical films,topographic occlusal films have a larger field size.

Question 10

The topographic occlusal projection can be used for:

A)detecting caries.
B)localizing impactions.
C)evaluating periodontal bone height.
D)visualizing large areas of pathology.

Question 11

Right-Angle Projection with right-angle occlusal projections,the vertical angulation should be at:

A)90 degrees.
B)40 degrees.
C)75 to 90 degrees.
D)35 to 75 degrees.

Question 12

When the periapical radiographs show the occlusal surfaces of the teeth what is the cause of this error with the bisecting technique?

A)Inadequate vertical angulation
B)Excessive vertical angulation or poor occlusal plane orientation
C)The patient's head has tipped away from the proper sagittal plane
D)Inadequate vertical angulation and the patient's head has tipped away from the proper sagittal plane

Question 13

The imaginary angle that is bisected with the use of the Bisecting Angle Technique is formed between the long axis of the tooth and:

A)the long axis of the PID.
B)the long axis of the receptor.
C)the horizontal axis of the receptor.
D)the horizontal axis of the tube head.

Question 14

Identify the number that correlates to the size of an occlusal film packet:

A)size 0.
B)size 1.
C)size 2.
D)size 4.

Question 15

Identify the major disadvantage of the bisecting technique:

A)it is difficult for the patient.
B)images produced are often distorted.
C)film holding devices may be confusing.
D)the long cone required is bulky and hard to manage.

Question 16

Which of the following is inherent in the use of the bisecting technique?

A)Overlapping
B)Patient movement
C)Dimensional distortion
D)Difficulty in receptor placement

Question 17

A +75 degree vertical angulation for a maxillary cuspid will produce a(an)elongated image.

Question 18

During the bisecting technique,an imaginary bisecting line is drawn to bisect the angle formed by the long axis of the tooth and the plane of the receptor.The central ray of the x-ray beam is directed vertically to this bisecting line.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.

Question 19

All of the following are possible patient scenario in which the bisecting angle technique would be used EXCEPT one.Which one is the EXCEPTION?

A)A child
B)An adult with a small mouth
C)A person with a low palatal vault
D)A person with a normal to high palatal vault

Question 20

In the mandibular occlusal technique,the receptor is placed in the patient's mouth on the occlusal surfaces of the lower teeth.The front (white side)of the packet should be facing the mandible on the occlusal surfaces of the lower teeth.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.