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Questions and Answers
What is a special consideration when using daylight-loading compartments for processing extraoral films?
What is a factor to consider when deciding whether to use automatic processing equipment?
Why may conventional darkroom equipment still be needed as a backup system?
What is a characteristic of automatically processed films?
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What can help minimize the issue of grain in automatically processed films?
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What is the arrangement of an automatic processor?
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What does the transport mechanism of an automatic processor do?
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What sections do automatic processors contain?
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Why may the quality of automatically processed films be lower than manually developed films?
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What is a consideration when using automatic processing equipment?
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Study Notes
Bitewing Projection
- Paper loop is used to support the film when the patient bites on the tab for a bitewing projection.
- This projection reveals the tooth crowns and alveolar crests.
Screen-Film Combinations
- Screen-film combinations are rated for speed, which measures the amount of radiation required for a proper exposure.
- For dental extraoral diagnostic tasks, it is recommended to use screen-film combinations that have a speed of 400 or faster.
Intensifying Screens
- The base material of most intensifying screens is a polyester plastic that is about 0.25 mm thick.
- The base provides mechanical support for the other layers.
- Some intensifying screens have a reflective base, which increases the light emission but also results in some image "unsharpness".
- The phosphor layer is composed of phosphorescent crystals suspended in a polymeric binder.
Safelight
- A safelight may be mounted on the wall or ceiling in the darkroom and should be at least 4 feet from the work surface.
- The safelight uses a GBX-2 filter and 15-watt bulb.
Film Processing
- The tank holds the water for maintaining the temperature of the developer and fixer in the insert tanks and for washing films.
- The developer and fixer are placed in the insert tanks, and the timer is set to the time indicated by the manufacturer for the solution temperature.
- Rapid-processing solutions typically develop films in 15 seconds and fix them in 15 seconds at room temperature.
- Rapid-processing solutions have a higher concentration of hydroquinone and a more alkaline pH than conventional solutions.
Automatic Processing Equipment
- Automatic processing equipment is expensive and must be cleaned frequently.
- The equipment may break down, and conventional darkroom equipment may still be needed as a backup system.
- The density and contrast of the radiographs tend to be consistent, but the quality of films processed automatically often is not as high as the quality of films developed manually.
- The mechanism of automatic processors has an in-line arrangement consisting of a transport mechanism that picks up exposed, unwrapped film and passes it through the developing, fixing, washing, and drying sections.
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