Final SG Flashcards
foreshortening
excessive (too much) vertical angulation
how incorrect film packet placement happens
operator placed bite block at least 1cm above occlusal surface of mandibular teeth
how to correct incorrect film packet placement
instrument and image receptor may be angled and tongue gently displaced to allow bite block to rest against teeth of interest before patient closes
also can place cotton roll on opposite surface.
bending of upper edge of film against palate
most of the distortion will be localized to bend area
elongation because of
improper vertical angulation
a carious lesion has
jagged margins
a composite has
a definite cut
erupting teeth
primary teeth undergoing external resorption due to eruptive force of permanent teeth
external resorption starts
from outside in
mylohyoid ridge/line is
posterior extension of mental ridge
lingual nerve transverse
lingual foramen
submandibular fossa houses
submandibular salivary gland
alveolar crest typically appears _____ below cementoenamel junction
1.5 to 2mm
PDL space appears as
a thing radiolucent line around root of tooth
incorrect horizontal angulation results in
overlapped contact areas
no apices are seen
improper placement of film packet
improper placement
a dropped corner is seen when edge of receptor is not placed parallel to incisal or occlusal surfaces of teeth
if vertical angulation is _______, image of tooth on receptor is shorter than actual tooth; images are foreshortened
too steep (excessive)
if vertical angulation is too steep (excessive)
the image of the tooth on receptor is shorter than actual tooth; images are foreshortened
how to correct if image is foreshortened
increase vertical angulation
if vertical angulation is ______, the image of tooth on receptor is longer than actual tooth; images are elongated
too flat (insufficient)
if vertical angulation is too flat (insufficient)
the image of tooth on receptor is longer than actual tooth; images are elongated
how to correct if image is elongated
decrease vertical angulation
a cone cut is seen when the position indicating device (PID)
is not properly aligned with periapical beam alignment device
a cone cut is seen as
a curved unexposed (clear) area on radiograph
overlapped interproximal contacts result from
incorrect horizontal angulation