Ch. 42 Extraoral Imaging

Question 1

What does the panoramic have that is used to align the patients teeth accurately?

Answer 1

Head positioner

Question 2

For a diagnostically correct panoramic image the is parallel to the floor

Answer 2

Frankfort Plane

Question 3

The __________ tube head has a vertical angulation that is not adjustable and rotates behind the patients head.

Answer 3

Panoramic

Question 4

The panoramic tube head houses the filament that produces electrons and target that produces _________

Answer 4

X-rays

Question 5

The digital panoramic unit uses an __________ to produce the image, instead of film

Answer 5

Sensor

Question 6

A “reverse smile line” that appears on the panoramic radiograph after being exposed, is what type of error?

Answer 6

The patients chin is too high during exposure

Question 7

___________________ is used in dentistry primarily for diagnostic lesions and planning implant cases

Answer 7

Computer Tomography

Question 8

When finding the exact location of the mandibular nerve for an extraction or implant , the _________ is the most Seoul type of imaging

Answer 8

( CBCT ) Cone beam computer tomography

Question 9

_____________ is the best extra oral radiograph to view the entire dentition, sinus cavities, and to detect caries

Answer 9

Panoramic

Question 10

If a patient has on earrings or glasses when exposing them to a panoramic radiographs , what will happen?

Answer 10

Ghost image

Question 11

Patients have a huge acceptance for _________ imaging because they do not have to hold uncomfortable film in their mouth

Answer 11

Panoramic

Question 12

When a patients jaw is outside the ______________, the image will appear blurred

Answer 12

Focal trough

Question 13

When taking a panoramic image, what error will occur when incorrectly placing the patients lead apron or using a leas apron with a thyroid collar

Answer 13

A radipaque cone shaped artifact

Question 14

When taking a panoramic image, what would cause the patients teeth to look skinny?

Answer 14

Patients teeth are too far forward on the bitewing block

Question 15

Scatter radiation is absorbed the lead strips on the _______.

Answer 15

Grub

Question 16

The ___________ is an imaginary three-dimensional curved area or space that bares the same shape as a horseshoe

Answer 16

Focal trough

Question 17

The _________ image will appear larger than normal and on the opposite side of the image

Answer 17

Ghost

Question 18

The intraoral imaging have more radiation exposure than the ___________ imaging

Answer 18

Panoramic (extraoral)

Question 19

What are the three main components of the panoramic unit?

Answer 19

Tube head, head positioner, and exposure controls

Question 20

What error occurs on the panoramic images when the lips are not closed on the bitewing-block during exposure?

Answer 20

A dark radiolucent shadow that obscures the anterior teeth

Question 21

What error occurred in a panoramic image, when the cervical spine appears as a radiopacity in the center of the image?

Answer 21

Patient is not sitting or standing straight up with a straight spine

Question 22

_________ radiograph is mostly used in oral surgery or in orthodontics

Answer 22

Skull

Question 23

On a panoramic unit the __________ is a lead plate with an opening shaped like a narrow vertical slit.

Answer 23

Collimator

Question 24

What type of lead apron should be avoided when taking a panoramic image?

Answer 24

Lead apron with a thyroid collar

Question 25

Full-featured ______________ panoramic units have better resolution, which produced better detail.

Answer 25

Digital technology

Question 26

_____________ is a special device that allows the operator to easily position both film and the patient for a panoramic image

Answer 26

Cephalostat

Question 27

What error occurs when the patient’s tongue is not in contact with the palate when taking a panoramic image?

Answer 27

A dark radiolucent shadow obscures the apices of the maxillary teeth

Question 28

The _________ makes it possible to see soft tissue, make images colorized and be sent over the internet

Answer 28

Cone Beam Computed Technology (CBCI)

Question 29

The ____________ projection shows the frontal and ethmoid sinuses, the orbits, and the nasal cavities of the skull

Answer 29

Posteroanterior

Question 30

When taking a panoramic image, both the image _________ and the __________ rotates around the patient

Answer 30

Receptor, Tubehead

Question 31

On the panoramic unit, what are the exposure controls allowed to be adjusted for patients of different sizes?

Answer 31

Millamperage & Kilovolatage

Question 32

When exposing a panoramic image, if the patient’s teeth are positioned too far back on the bitewing-block, what error will occur?

Answer 32

Anterior teeth that appear fat

Question 33

The quality of the panoramic view depends on ____________ placement of the patients jaw

Answer 33

Focal trough

Question 34

The purpose of the ____________ is to position the patient correctly in the focal trough.

Answer 34

Head positioner

Question 35

What error has occurred if the condoles are not visible in a panoramic image?

Answer 35

Patients chin is too low during exposure

Question 36

The _________ decreases film fog, increasing the contrast of the image/

Answer 36

Grid