the purpose of the hardening agent is to harden and shrink what
the gelatin
which size of bitewing film is used to examine posterior teeth of small children with primary dentition
0
when radiographs are veiwed subtle changes in density contrasts are easier to detect if
all extraneous light completely eliminated
suggestions for mounting radiographs include mounting bitewing radiographs with the curve of spee directed _____ toward the distill and remembering that most maxillary molars have how many roots ____
upward, 3
what is defined as the absence of pathogens
asepsis
which of the following are considered to be semi-critical instruments
xray film holding device
which of the following statements is true concerning cleaning and disinfection of the dental unit and environmental services
which of the following surfaces on an x-ray machine must be covered or disinfected
preparation of supplies and equipment involves sterilizing which of the following
film holding devices
when handling film the contaminated film package are opened with ______ hands and unwrapped films with ______ hands
gloved and non gloved
when the bisecting techniqe is used which of the following angles is bisected
the angle between the film and the long axis of the tooth
the primary benefit of using film holders with the bisecting technique is
reduces the patients exposure to radiation
when exposing a complete mouth series (FMX) when bisecting technique is used there are how many films recommended
14 does not include bitewings
to correct a film where apices do not appear
make certain that no more than an 1/8 of an inch extends above the incisal edge
a cone cut appears when
the PID is not properly aligned with the periapical film holder
when the film is reversed the image will be
light with a herringbone pattern
a panoramic film is typically used for evaluating
impacted teeth
in panoramic radiography the movement of the film and tubehead produces an image through a process known as what
tomography
in panoramic radiography what is the theoretical concept
the focal trough
the collimater used in panoramic radiography has an opening in the shape of what kind of slit
narrow vertical
the vertical angulation in the tubehead of the pano unit is
fixed in a position so that the x-ray beam is directed slightly upwards
the tubehead of the unit always rotates _____ the patients head and the film rotates ______
behind
in front
in panoramic radiography which of the following exposure factors cannot be changed
exposure time
what occurs in a ghost image
have a metallic or radiodense object causing the image
on a panoramic radiograph your teeth will appear skinny if your
teeth are to far forward on bite block
the disadvantage of panoramic radiography when contrasted with intraoral radiography is
the image on the pano is not as sharp as on the intraoral radiographs becasue of the intensifying screens
intraoral films are primarily used in which of the following specialty areas
oral surgery
the most common extraoral film is
panoramic
which of the following is the fastest recommend screen and screen film combo
rare earth with green light
a blank is a device that is used to reduce the amount of scatter radiation that reaches the extraoral film during exposure
a grid
lateral jaw radiography is what
for those with limited jaw opening
which of the following projections would be best to evalute impacted 3rd molars
ramus of the mandible
the purpose of the transcranial projection is to evaluate the articular eminence and the ____ surface of the condyle