Chapter 7 Flashcards
Which factor does not affect film speed?
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.
What causes graininess in a radiographic image?
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.
Which film size is used exclusively for bitewing radiographs?
D) Size 3
The size 3 film comes with a preattached bite tab and is used exclusively to take bitewing radiographs.
Which statement about automatic film processing is incorrect?
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.
Is film used for dental radiography similar to photographic film?
TRUE
Dental radiographic films are photographic films that have been adapted in size, emulsion, film speed, and packaging to customize them for dental use.
Are intraoral films designed for use outside the oral cavity?
FALSE
Extraoral films are designed for use outside the oral cavity.
Is dental x-ray film surrounded by a sheet of white paper inside the film packet?
FALSE
Film is wrapped in black paper because black is light-protective of the film.
Can film packets contain one or two films?
TRUE
If a packet contains two films, a duplicate radiograph is produced without any increase in radiation exposure to the patient.
Is the tab for opening the film packet on the tube side?
FALSE
The tab for opening the film packet is on the back side of the packet.
Should the embossed dot be positioned toward the apices of the teeth during periapical radiograph film packet placement?
FALSE
The embossed dot should be positioned away from the area of interest, which, on periapical radiographs, is the apices of the teeth.
Is intraoral film also known as screen film?
FALSE
Intraoral film is called nonscreen film because it does not use intensifying screens.
Are pedodontic films usually size 2 films?
FALSE
Size 0 or size 1 film is most often used as a pedodontic film.
Is the radiation exposure needed for extraoral film projections higher than for intraoral projections?
FALSE
The light emitted by the intensifying screens permits a significant reduction in the amount of radiation needed to produce an extraoral radiograph.
Can the same film type used for exposing dental radiographs be used to duplicate them?
FALSE
Duplicating film is similar to dental x-ray film but is a single-emulsion film.
Does a fast-speed film require more radiation exposure to record a diagnostic image?
FALSE
A fast-speed film requires less radiation exposure to record a diagnostic image.
Is the latent image slow in its formation when using slow-speed film?
FALSE
The latent image is an invisible pattern of stored energy produced when film is exposed to x-rays.
Does the lead foil in the film packet absorb back-scattered x-rays to reduce film fog?
TRUE
A sheet of lead foil is located in the back of the film packet, behind the film.
What is the composition of dental film emulsion?
TRUE
Dental film emulsion is about 90 to 99 percent silver bromide and 1 to 10 percent silver iodide.
Is the appearance of clear/white or radiopaque structures on the radiograph due to the developer step during film processing?
FALSE
The appearance of clear/white or radiopaque structures on the radiograph is a result of the fixer step during film processing.
Is intraoral film emulsion composed of gelatin and silver halide crystals?
TRUE
The emulsion is composed of gelatin in which crystals of silver halide salts are suspended.
Is the white, unprinted side of an intraoral film packet the back side?
FALSE
The white, unprinted side of an intraoral film packet is the front side.
Is a pedodontic film any film used to radiograph a child’s teeth?
FALSE
The term ‘pedodontic film’ is usually given to the smaller sized intraoral film packets.
Does duplicating film get lighter the longer the exposure to light?
TRUE
The solarized emulsion of duplicating film gets darker with less light exposure and lighter with more light exposure.
Should film be stored in its original packaging in an area shielded from radiation?
TRUE
Film should be stored in its original packaging in an area shielded from radiation.
What is the invisible image on a dental x-ray film that becomes visible after processing?
The latent image.
The silver halide crystals in film emulsion are sensitive to radiation.
What absorbs scattered radiation in the film packet?
Lead foil.
Placing lead foil behind the film in the film packet prevents fogging.
What is the color of the tube side of the film packet?
White.
It is essential to differentiate the tube side from the back side.
What number indicates the size of occlusal film?
Size 4.
The larger the number, the larger the size of the film.
What type of film is needed to copy a dental radiograph?
Duplicating film.
It is exposed by the actions of infrared and ultraviolet light.
Which part of dental x-ray film contains silver halide crystals suspended in gelatin?
The emulsion.
The function of the gelatin is to keep the silver halide crystals evenly suspended.
What is the purpose of the identification dot in intraoral dental x-ray film?
To distinguish the patient’s right and left sides.
Which side of the film packet faces the source of radiation?
The tube side of the film packet.
What is the sensitivity of a given type of dental x-ray film known as?
Speed.
Film speed refers to the amount of radiation needed to produce a radiograph of acceptable density.
What allows for a reduction in radiation for screen film?
The intensity of the fluorescent light emitted by the intensifying screens.
