DANB RADIOLOGY PRACTICE TEST
QUESTIONS AND ANSWERS
Which technique provides the most accurate image with the least distortion? - Answer-
The paralleling technique is recommended for providing the most accurate image with
the least amount of distortion.
Which anatomical structure is radiolucent on a dental radiograph? - Answer- The dentin
appears radiolucent on a processed dental periapical x-ray.
What are the main causes of unnecessary radiation exposure to patients? - Answer-
Expired film, patient movement, and retaking radiographs are main causes of
unnecessary radiation exposure.
Who legally owns dental images? - Answer- Dental images are legally the property of
the dentist as part of the patient's dental record.
Which of the following appears radiopaque on a dental x-ray? - Answer- The enamel is
radiopaque and located at the crown of the tooth.
What is a TRUE statement regarding the labial mounting technique? - Answer- In this
technique, radiographs are viewed as if the operator is looking directly at the patient,
with the patient's left being the operator's right.
Under what circumstances may a dental auxiliary hold a film during exposure? -
Answer- A dental auxiliary may hold an image receptor in a patient's mouth during
exposure if the patient is physically handicapped and unable to keep it in place.
What causes reticulation in radiographs? - Answer- Reticulation is caused by drastic
temperature changes between the developer and the rinse.
Which anatomical landmark assists in mounting the mandibular premolar periapical? -
Answer- The mental foramen can assist in mounting the mandibular premolar
periapical.
What causes disproportionate changes in the size of an image on a radiograph? -
Answer- Improper placement of the film prior to exposure can cause disproportionate
changes in image size.
, What is the amount of radiation absorbed per gram of tissue referred to as? - Answer- It
is referred to as a rad.
What is fast film, such as E-speed film? - Answer- Fast film requires less radiation to
produce an image on the film.
What happens when the kilovoltage (kV) setting in the tubehead is increased? -
Answer- Electrons move from the cathode to the anode with more speed.
What are the three supplies needed to duplicate a film? - Answer- Darkroom,
duplicating film, and processor.
What is true about different wavelengths produced in dentistry? - Answer- X-rays with
longer wavelengths have less penetrating power.
What assists in controlling the amount of radiation emitted to the patient? - Answer-
Using the proper exposure factors.
Which type of radiation is also known as 'useful radiation'? - Answer- Primary radiation.
What is the maximum permissible dose of radiation that a dental auxiliary can receive in
1 year? - Answer- 5 rems.
What is likely to cause a cone-shaped radiopaque image on a panoramic x-ray? -
Answer- Use of a thyroid collar during imaging.
What will be the appearance of a processed film if it is exposed to white light? - Answer-
The film will have a foggy appearance.
What size image receptor should be chosen for exposing periapical images on a young
child? - Answer- Size 0.
How should a dental assistant wear a dosimeter? - Answer- All day, every day.
Which image needs to show the entire tooth from 2-3 mm beyond the apex? - Answer-
Periapical image.
What is not an effective way to achieve the ALARA principle in the dental office? -
Answer- Using D film.
When using the bisecting technique, which angle is bisected? - Answer- The angle
formed by the image receptor and the long axis of the tooth.
What is a direct result when an image receptor is exposed with a high milliamperage
(mA) setting? - Answer- High density.
QUESTIONS AND ANSWERS
Which technique provides the most accurate image with the least distortion? - Answer-
The paralleling technique is recommended for providing the most accurate image with
the least amount of distortion.
Which anatomical structure is radiolucent on a dental radiograph? - Answer- The dentin
appears radiolucent on a processed dental periapical x-ray.
What are the main causes of unnecessary radiation exposure to patients? - Answer-
Expired film, patient movement, and retaking radiographs are main causes of
unnecessary radiation exposure.
Who legally owns dental images? - Answer- Dental images are legally the property of
the dentist as part of the patient's dental record.
Which of the following appears radiopaque on a dental x-ray? - Answer- The enamel is
radiopaque and located at the crown of the tooth.
What is a TRUE statement regarding the labial mounting technique? - Answer- In this
technique, radiographs are viewed as if the operator is looking directly at the patient,
with the patient's left being the operator's right.
Under what circumstances may a dental auxiliary hold a film during exposure? -
Answer- A dental auxiliary may hold an image receptor in a patient's mouth during
exposure if the patient is physically handicapped and unable to keep it in place.
What causes reticulation in radiographs? - Answer- Reticulation is caused by drastic
temperature changes between the developer and the rinse.
Which anatomical landmark assists in mounting the mandibular premolar periapical? -
Answer- The mental foramen can assist in mounting the mandibular premolar
periapical.
What causes disproportionate changes in the size of an image on a radiograph? -
Answer- Improper placement of the film prior to exposure can cause disproportionate
changes in image size.
, What is the amount of radiation absorbed per gram of tissue referred to as? - Answer- It
is referred to as a rad.
What is fast film, such as E-speed film? - Answer- Fast film requires less radiation to
produce an image on the film.
What happens when the kilovoltage (kV) setting in the tubehead is increased? -
Answer- Electrons move from the cathode to the anode with more speed.
What are the three supplies needed to duplicate a film? - Answer- Darkroom,
duplicating film, and processor.
What is true about different wavelengths produced in dentistry? - Answer- X-rays with
longer wavelengths have less penetrating power.
What assists in controlling the amount of radiation emitted to the patient? - Answer-
Using the proper exposure factors.
Which type of radiation is also known as 'useful radiation'? - Answer- Primary radiation.
What is the maximum permissible dose of radiation that a dental auxiliary can receive in
1 year? - Answer- 5 rems.
What is likely to cause a cone-shaped radiopaque image on a panoramic x-ray? -
Answer- Use of a thyroid collar during imaging.
What will be the appearance of a processed film if it is exposed to white light? - Answer-
The film will have a foggy appearance.
What size image receptor should be chosen for exposing periapical images on a young
child? - Answer- Size 0.
How should a dental assistant wear a dosimeter? - Answer- All day, every day.
Which image needs to show the entire tooth from 2-3 mm beyond the apex? - Answer-
Periapical image.
What is not an effective way to achieve the ALARA principle in the dental office? -
Answer- Using D film.
When using the bisecting technique, which angle is bisected? - Answer- The angle
formed by the image receptor and the long axis of the tooth.
What is a direct result when an image receptor is exposed with a high milliamperage
(mA) setting? - Answer- High density.
