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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
- bite-wing tab
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 chair
- adjust headrest (pt upper arch parallel to the floor)
- place lead apron and thyroid collar
- remove objects
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