Cheek side posterior
teeth (the mouth in its entirety)
cheek side anterior
biting surface of teeth
tongue side bottom and usually top
tongue side occasionally upper
surface closest to the midline of mouth
surface furthest from the midline
the sensitivity of a film to radiation exposure
kilovoltage or kilovoltage peak (KVP)
the peak voltage used during the exposure (deal with wavelength, density, and color)
the intensity of the electrical current used during exposure (deal with time)
the restriction (piece inside machine) of the size and shape of the x-ray beam (creates the primary beam)
aluminum pieces in the machine used to absorb low-energy x-rays
overall darkness or blackness of a radiograph
the invisible image on the film before processed
circular part of x-ray machine, position indicating device
effects the number of x-rays produced in a certain amount of time
inverse square law
the intensity of radiation is inversely proportional to the square of the distance from the source of radiation
paralleling techniques (XCP) dealing with PA's
film is placed parallel to the long axis of the tooth, the central ray is perpendicular to the long axis of the tooth and film holder
advantages of paralleling techniques
advantages-produces without dimensional distortion, easier to get the correct angle, able to recreate the exact angle again
bisecting techniques dealing with PA's
film is placed on an angle to bisect the long axis of the tooth, central ray is perpendicular to the long axis of the tooth and film holder
advantages of bisecting techniques
advantage-decreased exposure time, doesn't need to use film holder if patient's anatomy doesn't allow
disadvantages of paralleling techniques
disadvantages- film placement may cause patient discomfort
disadvantages of bisecting techniques
disadvantage-image distortion, difficult to get the proper angle, and unnecessary exposure
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