Chapter 7

Question 1

Which factor does not affect film speed?

Answer 1

C) Film packet size

The factors that determine film speed are the size of the silver halide crystals within the emulsion, the thickness of the emulsion, and the addition of special radiosensitive dyes by the film manufacturer.

Question 2

What causes graininess in a radiographic image?

Answer 2

A) Large silver halide crystals.

The larger crystals used in high-speed (fast) film result in a certain amount of graininess that reduces the sharpness of the radiographic image.

Question 3

Which film size is used exclusively for bitewing radiographs?

Answer 3

D) Size 3

The size 3 film comes with a preattached bite tab and is used exclusively to take bitewing radiographs.

Question 4

Which statement about automatic film processing is incorrect?

Answer 4

B) Chemical solutions are heated to match the temperature used in manual processing.

The chemistry in automatic processors is heated to temperatures higher than those used in manual processing.

Question 5

Is film used for dental radiography similar to photographic film?

Answer 5

TRUE

Dental radiographic films are photographic films that have been adapted in size, emulsion, film speed, and packaging to customize them for dental use.

Question 6

Are intraoral films designed for use outside the oral cavity?

Answer 6

FALSE

Extraoral films are designed for use outside the oral cavity.

Question 7

Is dental x-ray film surrounded by a sheet of white paper inside the film packet?

Answer 7

FALSE

Film is wrapped in black paper because black is light-protective of the film.

Question 8

Can film packets contain one or two films?

Answer 8

TRUE

If a packet contains two films, a duplicate radiograph is produced without any increase in radiation exposure to the patient.

Question 9

Is the tab for opening the film packet on the tube side?

Answer 9

FALSE

The tab for opening the film packet is on the back side of the packet.

Question 10

Should the embossed dot be positioned toward the apices of the teeth during periapical radiograph film packet placement?

Answer 10

FALSE

The embossed dot should be positioned away from the area of interest, which, on periapical radiographs, is the apices of the teeth.

Question 11

Is intraoral film also known as screen film?

Answer 11

FALSE

Intraoral film is called nonscreen film because it does not use intensifying screens.

Question 12

Are pedodontic films usually size 2 films?

Answer 12

FALSE

Size 0 or size 1 film is most often used as a pedodontic film.

Question 13

Is the radiation exposure needed for extraoral film projections higher than for intraoral projections?

Answer 13

FALSE

The light emitted by the intensifying screens permits a significant reduction in the amount of radiation needed to produce an extraoral radiograph.

Question 14

Can the same film type used for exposing dental radiographs be used to duplicate them?

Answer 14

FALSE

Duplicating film is similar to dental x-ray film but is a single-emulsion film.

Question 15

Does a fast-speed film require more radiation exposure to record a diagnostic image?

Answer 15

FALSE

A fast-speed film requires less radiation exposure to record a diagnostic image.

Question 16

Is the latent image slow in its formation when using slow-speed film?

Answer 16

FALSE

The latent image is an invisible pattern of stored energy produced when film is exposed to x-rays.

Question 17

Does the lead foil in the film packet absorb back-scattered x-rays to reduce film fog?

Answer 17

TRUE

A sheet of lead foil is located in the back of the film packet, behind the film.

Question 18

What is the composition of dental film emulsion?

Answer 18

TRUE

Dental film emulsion is about 90 to 99 percent silver bromide and 1 to 10 percent silver iodide.

Question 19

Is the appearance of clear/white or radiopaque structures on the radiograph due to the developer step during film processing?

Answer 19

FALSE

The appearance of clear/white or radiopaque structures on the radiograph is a result of the fixer step during film processing.

Question 20

Is intraoral film emulsion composed of gelatin and silver halide crystals?

Answer 20

TRUE

The emulsion is composed of gelatin in which crystals of silver halide salts are suspended.

Question 21

Is the white, unprinted side of an intraoral film packet the back side?

Answer 21

FALSE

The white, unprinted side of an intraoral film packet is the front side.

Question 22

Is a pedodontic film any film used to radiograph a child’s teeth?

Answer 22

FALSE

The term ‘pedodontic film’ is usually given to the smaller sized intraoral film packets.

Question 23

Does duplicating film get lighter the longer the exposure to light?

Answer 23

TRUE

The solarized emulsion of duplicating film gets darker with less light exposure and lighter with more light exposure.

Question 24

Should film be stored in its original packaging in an area shielded from radiation?

Answer 24

TRUE

Film should be stored in its original packaging in an area shielded from radiation.

Question 25

What is the invisible image on a dental x-ray film that becomes visible after processing?

Answer 25

The latent image. ## Footnote The silver halide crystals in film emulsion are sensitive to radiation.

Question 26

What absorbs scattered radiation in the film packet?

Answer 26

Lead foil. ## Footnote Placing lead foil behind the film in the film packet prevents fogging.

Question 27

What is the color of the tube side of the film packet?

Answer 27

White. ## Footnote It is essential to differentiate the tube side from the back side.

Question 28

What number indicates the size of occlusal film?

Answer 28

Size 4. ## Footnote The larger the number, the larger the size of the film.

Question 29

What type of film is needed to copy a dental radiograph?

Answer 29

Duplicating film. ## Footnote It is exposed by the actions of infrared and ultraviolet light.

Question 30

Which part of dental x-ray film contains silver halide crystals suspended in gelatin?

Answer 30

The emulsion. ## Footnote The function of the gelatin is to keep the silver halide crystals evenly suspended.

Question 31

What is the purpose of the identification dot in intraoral dental x-ray film?

Answer 31

To distinguish the patient's right and left sides.

Question 32

Which side of the film packet faces the source of radiation?

Answer 32

The tube side of the film packet.

Question 33

What is the sensitivity of a given type of dental x-ray film known as?

Answer 33

Speed. ## Footnote Film speed refers to the amount of radiation needed to produce a radiograph of acceptable density.

Question 34

What allows for a reduction in radiation for screen film?

Answer 34

The intensity of the fluorescent light emitted by the intensifying screens.