22,23,24

Question 0

In paranormic imagining ,

Answer 0

The receptor and x ray tube head move around the patient, in different directions.

Question 1

Panoramic imaging

Answer 1

Extra oral technique used to examine the maxilla and mandible on a single projection

Question 2

Rotation center

Answer 2

The pivotal point ,or axis around which the receptor and the X-ray tube head rotate.

Question 3

Depending on the manufacture one of three different rotational centers are used in the panoramic x ray machines. They are…

Answer 3

Double center rotation
Triple center rotation
Moving center rotation

Question 4

The rotation changes allow for…

Answer 4

The image Layer to conform to the elliptical shape of the dental arches.

Question 5

The focal trough

Answer 5

Can be defined as three deminsional curved zone in which structures are clearly demonstrated on panoramic image.

Question 6

Panoramic units may differ with regards to

Answer 6

The numbers of different rotation centers

Question 7

The collimator used in panoramic x ray tub heads differ…

Answer 7

from the ones used in intra oral

Question 8

The panoramic collimator is a

Answer 8

Lead plate with an opening in the shape of a narrow vertical slit

Question 9

The tube head always rotates

Answer 9

Behind the patients head

Question 10

The receptor always rotates

Answer 10

In front of the patients head

Question 11

When the cassette holder is exposed to X-rays

Answer 11

The screens convert the x ray energy into light,which in return exposes the screen film.

Question 12

Calcium tungstate screens emit

Answer 12

Blue light

Question 13

Rare earth screens emit

Answer 13

Green light and require less xray exposure and are considered faster than the calcium tungstate

Question 14

One intensifying screen is placed

Answer 14

On each side of the film and held in place when the cassette is closed.

Question 15

If the tongue is not in contact with the palate during exposure a dark radiolucent shadow that obscures the spices of the maxillary teeth results.to prevent such errors…

Answer 15

The patient must be instructed to swallow once and hold tounge against palate during procedure.

Question 16

If the patients chin is po intend up or too high

Answer 16

1 the hard palate and floor of the nasal cavity appear superimposed over the roots of the maxillary teeth
2 a loss of detail in the maxillary incisor region occurs.
3 the maxillary incisors appear blurred and magnified
4 * a revers smile line :( is seen in the image.

Question 17

If the patients teeth are too far forward on the bite block

Answer 17

Anterior teeth appear skinny and out of focus

Question 18

If the patients teeth are too far back on the bit block

Answer 18

The teeth appear fat

Question 19

The images seen on the paranormic are not as sharp as the intra oral projections because of

Answer 19

The intensifying screen

Question 20

Extra oral images are

Answer 20

Placed out side of he mouth and used to view large areas of the skull or the Jaws. Many are primarily used in orthodontics and oral surgery.

Question 21

Extra oral projection may be used alone or in conjunction with

Answer 21

Intra oral projections, they aren’t also not as defined as intra oral projections.

Question 22

An occlusal size ? May be used for some extra oral images

Answer 22

4

Question 23

The occlusal film used extra orally does not

Answer 23

Cover as large of an area as does a screen film

Question 24

The fron side of the cassette

Answer 24

Covered with plastic and and permits the passage of the X-ray

Question 25

The back side of the cassette.

Answer 25

Made of metal to reduce scatter

Question 26

A grid

Answer 26

Canberra used to decrees film fog and increase the contrast of the image

Question 27

Scatter radiation is absorbed by the lead strips and does not reach the surface of the film to cause film fog to compensate for the lead strips

Answer 27

Exsposure time must be increased.

Question 28

Lateral jaw imaging is used to examine

Answer 28

The posterior region of the mandible and invaluable for use in children to patients limited jaw opening. And also in patients whom have difficulty stabilizing or tolerating intra oral receptors.

Question 29

The purpose of the lateral jaw projection- body of mandible

Answer 29

To evaluate impacted teeth ,fractures, and lesions in the body of the mandible.

Question 30

Head position

Answer 30

Tipped 15 degrees toward the side being imaged

Question 31

Revers towne projection

Answer 31

To identify fractures of the condylar neck and ram us area.

Question 32

Before the gag reflex is initiated the following two reactions accrue

Answer 32

Cessation of respiration

Contraction of the throat and abdomen muscles.

Question 33

The most likely to election the gag reflex is the

Answer 33

Maxillary molar receptor

Question 34

In The patent with hypersensitive gag reflex the exposure sequence should be altered so the

Answer 34

Maxillary molar receptors are last

Question 35

If the patents gag reflex is uncontrollable

Answer 35

The dental radiographer should not use the intra oral imaging.instead use the paranormic or lateral jaw images

Question 36

To reduce gag reflex

Answer 36

Do reassure the patient and remove the receptor as quickly as possible.
Do try to distract the patient. Position leg or arm in the air to divert attention.

Question 37

Patients with vision impared

Answer 37

Communicate using clear verbal explanations

Question 38

If a paranormic x ray machine is not available

Answer 38

14 periapicle (6 anterior 8 posterior ) can be used.

Question 39

Size ? Is typically used for the edentulose examination

Answer 39

2

Question 40

The receptor should be placed that…

Answer 40

One third of it extends beyond the edentulose ridge

Question 41

If the alveolar ridges are severely resorted

Answer 41

A bisecting technique is recommended