Dental Radiology Practice Test
Questions and Answers 100% Pass
How does a digital sensor in dental radiography reduce radiation exposure compared to
traditional film?
✔✔Digital sensors are more sensitive to radiation, allowing for lower exposure settings,
reducing the overall radiation dose to the patient.
What is the function of the fixer solution in traditional film processing?
✔✔The fixer solution stabilizes the image by removing unexposed silver halide crystals and
hardening the emulsion.
What should be done if a dental radiograph is underexposed?
✔✔If the radiograph is underexposed, the exposure time or settings should be adjusted, and the
image should be retaken for clearer visibility.
What does a radiograph with a high contrast look like?
✔✔A high contrast radiograph has a significant difference between light and dark areas, making
structures like bone and soft tissue more distinct.
1
,What does a radiograph with a low contrast look like?
✔✔A low contrast radiograph has a minimal difference between light and dark areas, which may
make it harder to differentiate between structures.
What is the importance of using a proper X-ray beam collimation?
✔✔Proper collimation ensures that only the area of interest is exposed, reducing unnecessary
radiation to surrounding tissues and improving image quality.
How does the "inverse square law" apply to dental radiography?
✔✔The inverse square law states that as the distance from the X-ray source increases, the
radiation intensity decreases exponentially, reducing the dose to the patient.
What is the significance of using the correct vertical angulation in periapical radiography?
✔✔Correct vertical angulation ensures the X-ray beam is directed at the right angle to minimize
distortion and avoid overlapping of teeth.
What is the purpose of using a lead barrier or wall in the X-ray room?
✔✔A lead barrier helps shield both the patient and radiographer from unnecessary radiation
exposure during the imaging process.
2
, What is the difference between a full-mouth series and a panoramic radiograph?
✔✔A full-mouth series includes a set of periapical and bitewing radiographs, while a panoramic
radiograph provides a broad, single image of the teeth and jaw.
What does an X-ray film's "emulsion" contain?
✔✔The emulsion contains silver halide crystals that react to radiation, forming an image.
What is the most common type of X-ray used in dental radiology?
✔✔The most common type is the bitewing radiograph.
What does a panoramic radiograph show?
✔✔A panoramic radiograph shows the entire upper and lower jaw, including the teeth,
surrounding bone, and other structures.
What is the function of a lead apron in dental radiography?
✔✔The lead apron protects the patient’s body from unnecessary radiation exposure during the
X-ray procedure.
3
Questions and Answers 100% Pass
How does a digital sensor in dental radiography reduce radiation exposure compared to
traditional film?
✔✔Digital sensors are more sensitive to radiation, allowing for lower exposure settings,
reducing the overall radiation dose to the patient.
What is the function of the fixer solution in traditional film processing?
✔✔The fixer solution stabilizes the image by removing unexposed silver halide crystals and
hardening the emulsion.
What should be done if a dental radiograph is underexposed?
✔✔If the radiograph is underexposed, the exposure time or settings should be adjusted, and the
image should be retaken for clearer visibility.
What does a radiograph with a high contrast look like?
✔✔A high contrast radiograph has a significant difference between light and dark areas, making
structures like bone and soft tissue more distinct.
1
,What does a radiograph with a low contrast look like?
✔✔A low contrast radiograph has a minimal difference between light and dark areas, which may
make it harder to differentiate between structures.
What is the importance of using a proper X-ray beam collimation?
✔✔Proper collimation ensures that only the area of interest is exposed, reducing unnecessary
radiation to surrounding tissues and improving image quality.
How does the "inverse square law" apply to dental radiography?
✔✔The inverse square law states that as the distance from the X-ray source increases, the
radiation intensity decreases exponentially, reducing the dose to the patient.
What is the significance of using the correct vertical angulation in periapical radiography?
✔✔Correct vertical angulation ensures the X-ray beam is directed at the right angle to minimize
distortion and avoid overlapping of teeth.
What is the purpose of using a lead barrier or wall in the X-ray room?
✔✔A lead barrier helps shield both the patient and radiographer from unnecessary radiation
exposure during the imaging process.
2
, What is the difference between a full-mouth series and a panoramic radiograph?
✔✔A full-mouth series includes a set of periapical and bitewing radiographs, while a panoramic
radiograph provides a broad, single image of the teeth and jaw.
What does an X-ray film's "emulsion" contain?
✔✔The emulsion contains silver halide crystals that react to radiation, forming an image.
What is the most common type of X-ray used in dental radiology?
✔✔The most common type is the bitewing radiograph.
What does a panoramic radiograph show?
✔✔A panoramic radiograph shows the entire upper and lower jaw, including the teeth,
surrounding bone, and other structures.
What is the function of a lead apron in dental radiography?
✔✔The lead apron protects the patient’s body from unnecessary radiation exposure during the
X-ray procedure.
3
