Chapter 23: Extraoral Imaging

Chapter 23: Extraoral Imaging

 

Complete Chapter Questions With Answers

 

Sample Questions Are Posted Below

 

MULTIPLE CHOICE

 

1. An extraoral image is placed __________ the mouth during x-ray exposure. Extraoral imaging is used to image _________ areas of the skull or jaws.

a.	outside; small
b.	outside; large
c.	inside; small
d.	inside; large

 

 

ANS:  B

An extraoral image is placed outside the mouth during x-ray exposure. Extraoral imaging is used to image large areas of the skull or jaws.

 

DIF:    Recall             REF:   Page 256        OBJ:   2

TOP:   CDA, RHS, I.B.1.b.i. Define factors that influence quality of the radiographic image

MSC:  NBDHE, 2.3 Technique

 

2. (1) A thyroid collar is used for Waters, submentovertex, and reverse Towne projections. (2) A thyroid collar is not used for the lateral jaw, lateral cephalometic, and the posteroanterior projections.

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.

 

 

ANS:  D

A thyroid collar is not used for extraoral projections.

 

DIF:    Comprehension                               REF:   Page 265        OBJ:   4

TOP:   CDA, RHS, I.B.1.b.i. Define factors that influence quality of the radiographic image

MSC:  NBDHE, 2.3 Technique

 

3. (1) Temporomandibular joint tomography is used to evaluate the condyle, articular eminence, and glenoid fossa. (2) Other landmarks are blurred in TMJ tomography.

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.

 

 

ANS:  A

Temporomandibular joint tomography is used to evaluate the condyle, articular eminence, and glenoid fossa. TMJ tomography is a technique used to show structures located within a selected plane of tissue while blurring structures outside the selected plane.

 

DIF:    Comprehension                               REF:   Page 271        OBJ:   5

TOP:   CDA, RHS, I.B.1.b.i. Define factors that influence quality of the radiographic image

MSC:  NBDHE, 2.3 Technique

 

4. Which of the following would you evaluate using an extraoral image?

a.	Gutta percha placement in the root canal
b.	Level of crestal bone
c.	Recurrent decay
d.	Growth and development

 

 

ANS:  D

The intraoral image is used to evaluate gutta percha root canal fillings; the integrity of the crest of alveolar bone; recurrent decay. The extraoral image is typically used to evaluate growth and development.

 

DIF:    Application    REF:   Page 256        OBJ:   2

TOP:   CDA, RHS, I.B.1.b.i. Define factors that influence quality of the radiographic image

MSC:  NBDHE, 2.3 Technique

 

5. Extraoral images may be used in conjunction with intraoral images. Extraoral images are not as defined or sharp as intraoral images.

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.

 

 

ANS:  A

Extraoral images may be used in conjunction with intraoral images. Extraoral images are not as defined or sharp as intraoral images.

 

DIF:    Recall             REF:   Page 256        OBJ:   2

TOP:   CDA, RHS, I.B.1.b.i. Define factors that influence quality of the radiographic image

MSC:  NBDHE, 2.3 Technique