DH103 Dental Radiology Midterm
Questions with Complete Solutions
What are the potential risks associated with excessive radiation exposure in dental radiography?
✔✔Excessive radiation exposure can increase the risk of cancer and other health issues, which is
why minimizing exposure is critical.
What is the recommended safety distance for dental professionals during an X-ray exposure?
✔✔The recommended safety distance is at least six feet or, if closer, behind a protective barrier
to minimize radiation exposure.
What is the purpose of the dental lead apron with a thyroid collar?
✔✔The lead apron with a thyroid collar helps protect the patient from unnecessary radiation
exposure to the torso and thyroid gland.
Why is it necessary to use a timer in dental radiography?
✔✔A timer ensures precise control over the exposure time, which is essential for obtaining a
quality radiograph without overexposing the patient.
1
,What should be done if a radiograph is too dark or overexposed?
✔✔If a radiograph is too dark, reduce the exposure time or adjust the settings to avoid
overexposure.
What does "distortion" refer to in dental radiography?
✔✔Distortion occurs when the image is altered due to incorrect positioning, angulation, or
exposure, leading to inaccurate representation of the teeth or structures.
What is the role of the developer solution in film processing?
✔✔The developer solution chemically reduces exposed silver halide crystals to form a visible
image on the film.
What is the difference between a diagnostic radiograph and a non-diagnostic radiograph?
✔✔A diagnostic radiograph provides clear, detailed images that can aid in diagnosis, while a
non-diagnostic radiograph is unclear or incomplete, requiring retakes.
How does the use of a positioning ring improve the quality of dental radiographs?
✔✔The positioning ring ensures accurate film positioning and angulation of the X-ray beam,
reducing errors and improving image quality.
2
,What is the purpose of the bitewing radiograph in dental radiology?
✔✔The bitewing radiograph is used to detect dental decay between teeth and assess the level of
bone supporting the teeth.
How should dental X-ray films be stored to maintain their quality?
✔✔Dental X-ray films should be stored in a cool, dry place away from radiation and light to
prevent damage.
What is the function of the lead apron during dental radiographic procedures?
✔✔The lead apron protects the patient from unnecessary radiation exposure by absorbing scatter
radiation during the procedure.
What is the difference between direct and indirect digital radiography?
✔✔Direct digital radiography uses a sensor to capture and transmit the image to a computer
immediately, while indirect digital radiography uses a phosphor plate that is scanned to create
the image.
What is the importance of the paralleling technique in dental radiography?
3
, ✔✔The paralleling technique minimizes distortion and ensures accurate imaging by positioning
the film parallel to the long axis of the tooth.
What is the role of the central ray in dental radiography?
✔✔The central ray is the X-ray beam's primary path and must be properly aligned with the film
and the tooth for optimal image quality.
What is the purpose of using a radiographic grid?
✔✔A radiographic grid is used to reduce scatter radiation, improving image clarity and contrast.
Why is it essential to use the correct exposure settings in dental radiography?
✔✔Correct exposure settings ensure that the radiograph is neither overexposed nor
underexposed, providing accurate diagnostic information.
What does the term "overexposure" in dental radiography refer to?
✔✔Overexposure occurs when the X-ray exposure time is too long, resulting in a dark
radiograph with excessive density.
What is the role of the fixer solution in film processing?
4
Questions with Complete Solutions
What are the potential risks associated with excessive radiation exposure in dental radiography?
✔✔Excessive radiation exposure can increase the risk of cancer and other health issues, which is
why minimizing exposure is critical.
What is the recommended safety distance for dental professionals during an X-ray exposure?
✔✔The recommended safety distance is at least six feet or, if closer, behind a protective barrier
to minimize radiation exposure.
What is the purpose of the dental lead apron with a thyroid collar?
✔✔The lead apron with a thyroid collar helps protect the patient from unnecessary radiation
exposure to the torso and thyroid gland.
Why is it necessary to use a timer in dental radiography?
✔✔A timer ensures precise control over the exposure time, which is essential for obtaining a
quality radiograph without overexposing the patient.
1
,What should be done if a radiograph is too dark or overexposed?
✔✔If a radiograph is too dark, reduce the exposure time or adjust the settings to avoid
overexposure.
What does "distortion" refer to in dental radiography?
✔✔Distortion occurs when the image is altered due to incorrect positioning, angulation, or
exposure, leading to inaccurate representation of the teeth or structures.
What is the role of the developer solution in film processing?
✔✔The developer solution chemically reduces exposed silver halide crystals to form a visible
image on the film.
What is the difference between a diagnostic radiograph and a non-diagnostic radiograph?
✔✔A diagnostic radiograph provides clear, detailed images that can aid in diagnosis, while a
non-diagnostic radiograph is unclear or incomplete, requiring retakes.
How does the use of a positioning ring improve the quality of dental radiographs?
✔✔The positioning ring ensures accurate film positioning and angulation of the X-ray beam,
reducing errors and improving image quality.
2
,What is the purpose of the bitewing radiograph in dental radiology?
✔✔The bitewing radiograph is used to detect dental decay between teeth and assess the level of
bone supporting the teeth.
How should dental X-ray films be stored to maintain their quality?
✔✔Dental X-ray films should be stored in a cool, dry place away from radiation and light to
prevent damage.
What is the function of the lead apron during dental radiographic procedures?
✔✔The lead apron protects the patient from unnecessary radiation exposure by absorbing scatter
radiation during the procedure.
What is the difference between direct and indirect digital radiography?
✔✔Direct digital radiography uses a sensor to capture and transmit the image to a computer
immediately, while indirect digital radiography uses a phosphor plate that is scanned to create
the image.
What is the importance of the paralleling technique in dental radiography?
3
, ✔✔The paralleling technique minimizes distortion and ensures accurate imaging by positioning
the film parallel to the long axis of the tooth.
What is the role of the central ray in dental radiography?
✔✔The central ray is the X-ray beam's primary path and must be properly aligned with the film
and the tooth for optimal image quality.
What is the purpose of using a radiographic grid?
✔✔A radiographic grid is used to reduce scatter radiation, improving image clarity and contrast.
Why is it essential to use the correct exposure settings in dental radiography?
✔✔Correct exposure settings ensure that the radiograph is neither overexposed nor
underexposed, providing accurate diagnostic information.
What does the term "overexposure" in dental radiography refer to?
✔✔Overexposure occurs when the X-ray exposure time is too long, resulting in a dark
radiograph with excessive density.
What is the role of the fixer solution in film processing?
4
