Lets talk about teeth
The uses of dental images include the detection of
a. incipient occlusal lesions.
b.abnormalities in surrounding hard and soft tissues.
c periodontal probing depths.
d. percussion sensitivity as part of endodontic evaluation.
b. abnormalities in surrounding hard and soft tissues.
The component of the x-ray machine that functions in positioning the tubehead is the
a. kilovoltage selector.
b. control panel.
c. extension arm.
d. cathode.
c. extension arm
The degree of density or blackness on an image is controlled by the
a. low-voltage circuit.
b. kilovoltage.
c. milliampere seconds.
d. position indicating device.
C. milliampere seconds
Damage caused by ionizing x-radiation to genetic cells
a. affects only the person being exposed.
b. can affect future generations.
c. affects only the dental assistant.
d. affects the cells of the eye, skin, and oral mucosa.
b. can affect future generations
The purpose of the lead foil in the dental film packet is to
a. provide stiffness to the film.
b. reduce film fogging.
c. absorb the primary beam.
d. make the packet more flexible and resilient.
b. film foggin
In dentistry, the __________ the wavelengths of the x-rays, the greater their energy and their usefulness.
a. shorter
b. longer
c. more ionized
d. straighter
A. shorter
The heart of the x-ray generating system is the
a. x-ray tube.
b. insulating oil.
c. transformer.
d. position indicator device.
A. xray tube
The penetrating power of the x-ray beam is controlled by the settings on the
a. impulse timer.
b. kilovolt setting.
c. milliamp setting.
d. All of the above are correct.
b. kilovolt
One of the rules of radiation protection is never stand closer than ______ feet from the x-ray unit during an exposure unless you are behind a barrier.
a. 2
b. 6
c. 10
d. 15
b. 6
The correct order of steps in manual film processing is
a. fix, rinse, develop, wash.
b. develop, rinse, fix, wash.
c. fix, wash, rinse, wash.
d. rinse, develop, fix, wash.
b. develop, rinse, fix, wash
When the master switch is on
a. x-rays are being produced.
b. the red emission light will illuminate.
c. the electron cloud is created around the tungsten filament.
d. Photons travel from the cathode to the anode in the tubehead
c. the electron cloud is created around the tungsten filament
If a patient is small and petite, to get the same density radiograph it is best to reduce the
a. exposure time.
b. mA.
c. kVp.
d. exposure time and mA.
d. exposure time and mA
The lead collimator is used to
a. make the primary beam more accurate.
b. restrict the size and shape of the primary beam.
c. remove long wavelengths.
d. stop production of the primary beam.
b. restrict the size and shape of the primary beam.
Digital radiography requires less radiation than traditional radiography because the
a. exposure time is increased.
b. sensor is smaller.
c. sensor is more sensitive to x-ray energy.
d. sensor is attached to the computer.
c. sensor is more sensitive to xray energy.
The bitewing view is used for detecting
a. devital abscessed teeth.
b. bone loss associated with periodontal disease.
c. interproximal caries.
d. Both B and C.
d. both b&c
bone loss associated with periodontal disease
interproximal carries
The exposure sequence for the posterior teeth should begin with the _____ right _____ view.
a. maxillary; premolar
b. maxillary; molar
c. mandibular; premolar
d. mandibular; molar
a. maxillary; premolar
A radiograph that has an overall gray appearance is generally preferred. This radiograph is said to have
a. high density.
b. low density.
c. high contrast.
d. low contrast.
d. low contrast
All the following organs are more sensitive to radiation and are considered critical organs except
a. skin.
b. muscle.
c. thyroid gland.
d. lens of the eye.
b. muscle
Radiographic images on an edentulous patient might be required for detection of
a. interproximal caries.
b. defective margins on crowns.
c. retained root tips, impacted teeth, and lesions.
d. a periapical abscess.
c. retained root tips, impacted teeth, and lesion
Which technique can be used in situations such as a small mouth, shallow palate, or the presence of tori?
a. Paralleling technique
b. Bitewing technique
c. Bisecting technique
d. Long-cone technique
c. bisecting technique
One of the earliest signs of overexposure to x-rays may be
a. keratosis.
b. loss of hair.
c. erythema.
d. blindness.
c. erythema
How well the image reproduces fine detail or distinct outlines of an object is called
a. sharpness.
b. magnification.
c. density.
d. contrast.
A. sharpness
When taking radiographs using film, the white side of the film is always placed
a. away from the teeth.
b. toward the teeth.
c. either away from or toward the teeth; it does not matter.
d. right next to the teeth being radiographed.
b. toward the teeth
The molar bitewing image should be centered over the
a. second premolar.
b. first molar.
c. second molar.
d. third molar.
c. second molar