DH radiology quiz 3
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describe the principles for the bite-wing technique
film is placed in the mouth parallel to crown of both upper and lower teeth
film is stabilized when pt bites on bite-wing tab or bite-wing film holder
central ray is directed through the contacts of teeth using a vertical angulation of +10 degrees
what types of holders are used for bite-wings?
rinn XCP bite-wing instrument
what are size 0 films used for?
children with primary dentition
what are size 1 films used for?
children with mixed dentition
what are size 2 films used for?
teens and adults. can be placed vertically or horizontally
what are size 3 films used for?
one film taken on each side of adults....not recommended
describe correct horizontal angulation of bite-wing films
central ray is directed perpendicular to curvature of arch and through the contact areas of teeth
describe incorrect horizontal angulation of bite-wing technique.
results in overlapped contacts and nondiagnostic films
describe correct verticle angulation of the bite-wing technique.
angle of +10 degrees, used to compensate for the slight bend of the upper portion of the film and slight tilt of maxillary teeth
describe incorrect verticle angulation of the bite-wing technique.
results in a distorted image and nondiagnostic film
what are the rules of film placement for the bite-wing technique?
must be placed to cover the prescribed area of teeth to be examined
what are the rules of film position for the bite-wing technique?
must be parallel to crowns of both upper and lower teeth and must be stabilized as patient bites
what are the rules of verticle angulation for the bite-wing technique?
central ray must be directed at +10 degrees
what are the rules of horizontal angulation for the bite-wing technique?
central ray must be directed through contact areas
describe the step-by-step procedure of pt preparation for bite-wing technique
explain procedure to pt
adjust headrest (pt upper arch parallel to the floor)
place lead apron and thyroid collar
describe the step-by step procedure of equipment preparation for the bite-wing technique.
set exposure factors (kVp, ma, and time)
open sterilized packages and assemble film holders if needed
set verticle and horizontal angulation on tube-head
where are bitewing films necessary?
only in areas of interproximal contact
how do you know how many bitewing films to take on a pt?
it is based on the amount of teeth in the arch
what is the sequence order for bite-wing films?
in FMX expose all pa films first and finish with bite-wing films
in BWX expose premolars first, than molars
what do you want to see on the premolar film?
centered on the 2nd premolar
see the distal of or entire canine, and the 1st molar
what do you want to see on the molar film?
centered on the 2nd molar
see distal or whole 2nd premolar and all 3 molars if possible
what are verticle bite-wings used for?
to examine the level of alveolar bone in periodontal patients
what should you do for bite-wing films in the case of edentulous spaces?
use cotton rolls in areas of missing teeth
avoid tipped films
what should you do about bitewing films in the case of bony growth?
place film between the tongue and tori
if large tori are present, position tab at edge of teeth or use film holder
DH radiology quiz 3