MDA Ch 38-42 practice exam
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| _______ refers to how well the radio-graph reproduces fine details or distinct outlines of an object | Sharpness
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| the x-ray was discovered on November 8, 1985 by? | Wilhelm Conrad Roentgen
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| the most critical component in film processing quality control is? | maintaining the freshness of the processing solutions
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| The most commonly used film size used for adult intraoral dentistry is ______. | size #2
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| What part of the cell is affected by x-rays? | electron
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| Energy is defined as | the ability to do work.
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| When the PID is placed correctly, the dental film should always be placed with the lead foil sheet positioned | away from the tooth.
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| The Guidelines for Prescribing Dental Radiographs issued by the American Dental Association and FDA recommend which of the following dental radiographic procedures for a pregnant patient? | Radiographic procedures do not need to be altered because of pregnancy.
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| What is the term used to describe that each dose of radiation adds on to earlier doses? | Cumulative
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| Exposure to radiation over a long time is called | Chronic exposure.
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| Which of the following tissues has the highest radiation sensitivity? | small lymphocytes
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| Which of the following statements is true concerning the structure of the atom? | The orbital path of an electron around the nucleus is called an electron shell
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| The dentist who is credited with the first practical use of radiographs in dentistry in 1896 is: | Edmund Kells
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| Exposure to radiation _______. | no matter how small, has the potential to cause harmful biologic changes
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| Which component of the x-ray machine functions in positioning the tubehead? | extension arm
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| One of the rules of radiation protection is to never stand closer than _______ feet from the x-ray unit during an exposure unless you are behind a barrier. | 6 Feet
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| A light leak in the darkroom can result in | a dull gray film that lacks contrast.
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| a dull gray film that lacks contrast. | kilovoltage selector
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| What should the dental assistant do if a patient refuses dental radiographs? | a. Document in the patient's record the fact that he or she refused recommended radiographs.
b. Explain to the patient the importance of radiographs.
c. Discuss the patient's refusal with the dentist.
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| The longer the wavelength the __________ its ability to penetrate matter. | Less
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| The overall blackness or darkness of a film is called | density
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| Secondary radiation _______. | refers to x-radiation that is created when the primary beam interacts with matter
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| The heart of the x-ray generating system is the _______. | x-ray tube
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| The Consumer-Patient Radiation Health and Safety Act requires that: | anyone taking radiographs by trained and certified.
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| In which part of the x-ray tube are electrons given off by a heated filament? | Cathode
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| A plan to ensure that dental office procedures and equipment produce high quality images with a minimum of exposure to patients and personnel is called | quality assurance
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| The range of shades of gray between black and white on a radiograph is called | contrast
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| A structure that appears dark on a radiograph because it allows radiation to easily pass through it is called | radiolucent
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| List four characteristics of x-rays. | No mass or weight
No charge
Cause ionization
Absorbed by matter
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| The major source of cross-contamination during radiographic procedures is the | exposed film packet.
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| Anything that occupies space and has a form or shape is ______. | matter
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| Damage caused by ionizing x-radiation to genetic cells: | can affect future generations.
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| Infection Control Guidelines for Dental Radiology are made by the | CDC (Centers for Disease Control and Prevention)
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| In which part of the x-ray tube does the impact of electrons on a tungsten target produce x-rays? | Anode
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| Which of the following statements is true regarding Federal and State regulations on the use of dental radiograph equipment? | Most states have laws that require inspections of dental x-ray equipment on a regular basis.
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| An electron | is a negatively charged particle.
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| What is the purpose of the cathode in the dental x-ray tube? | to supply the electrons necessary to generate x-rays.
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| Radiographs are the property of: | the dentist
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| What type of radiation is given off when the primary beam comes is deflected as it contacts the bones of the skull and teeth? | scatter
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| The acronym ALARA stands for | As Low As Reasonably Achievable
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