radiology

During panoramic positioning of the patient, if the patient's chin is positioned too low, the following will be seen on the processed radiograph

• the absence of the patients condyles in the correct anatomical position

• open contact on the posterior teeth

• detail in the anterior apical regions

• a smile line curved downward

the maximum permissible dose of radiation of exposure allowed to a dental auxiliary in a 13-week consecutive period is

• 3 roentgens

• 100 mrem

• 5 rem

• 6 rad

for intraoral x-rays, what film speed is the fastest and reduces the amount of patient exposure to radiation

• D-speed

• F-speed

• A-speed

• H-speed

which of the following choice is TRUE regarding chronic radiation exposure?

• exposure to radiation from a nuclear power plant leak is an example of chronic radiation exposure

• chronic radiation exposure will not be passed on the future generations

• this type of exposure can be easily linked to the source

• this type of radiation exposure is a risk to dental staff that process dental radiographs

Which of the following would likely NOT be necessary in the case of an accidental radiation exposure?

• evaluate the building

• turn the power to the system off immediately

• advise exposed individuals to obtain medical care if needed

• report the exposure to the Radiation Protection Office (RPO)

which of the following will appear the most radiopaque on a dental radiograph?

• composite restorations

• gutta percha

• amalgam restorations

• porcelain crowns

which of the following is a true statement regarding the use of lead aprons and thyroid collars?

• the thyroid collar is optional for older adults past childbearing years

• lead aprons should be cleaned thoroughly and folded in thirds between patients use

• the use of lead aprons and thyroid collars will prevent cancer from developing in the thyroid gland

• the apron should cover from the neck to just about the patients knees

what is the most likely reason for a dental radiographer to receive a reading on their personal radiation monitoring device?

• failure of the dental radiographer in following the rules of working with radiation, to include not wearing the badge outside of the clinic/practice

• expired film

• uncooperative patients

• faulty radiation-monitoring device

which of the following is a main disadvantage of using digital imaging in dentistry?

• the speed of viewing images

• the sensor size and thickness

• the amount of radiation that a patient is exposed to

• the gray-scale resolution

if a dental X-ray tube head has a faulty seal the following will result

• the x-ray unit will not turn on

• the electrical system of the dental radiography unit will sound an alarm

• leakage of radiation

• the x-ray unit will not emit radiation/energy to successfully expose a film