15. B (INTRAORAL RADIOGRAPH TECHNIQUES) Flashcards
also called interproximal radiograph
BITEWING RADIOGRAPH
includes:
o crown of both mandibular and maxillary teeth
o alveolar crest
BITEWING RADIOGRAPH
takes name from the original technique which involves the
patient biting on a small wing attached to an intraoral film pocket; the use of wings has now been eliminated with the use of modern film holders
BITEWING RADIOGRAPH
clinically indicated for the detection of:
o dental caries
o monitoring the progression of dental caries, particularly valuable for detecting interproximal caries
o assessment of existing restorations
o assessment of periodontal status
BITEWING RADIOGRAPH
the long axis of bitewing radiograph must be oriented
______but may also be _____
horizontally, vertically
the horizontal plane, the x-ray tubehead should be aimed so that the beam meets the teeth and the film packet at right angles and passes directly through all the contact areas
BITEWING RADIOGRAPH
T or f
In BITEWING RADIOGRAPH
when placing the film, there are different dental arch shapes that dictate it:
U and V Arch
Square Arch
T
one film for both premolars and molars (unless taking all the way to third molar)
A. U and V Arch
B. Square Arch
A
two films due to shape of the arch; separate film for premolar and molar
A. U and V Arch
B. Square Arch
B
for vertical orientation, the x-ray tubehead should be aimed ______, approximately _____ degrees to the horizontal plane; this is to compensate for the upwardly rising curve of Monsoon
downwards, 5-8
?
Choose appropriate size of film
- 2 for adults, 1 for children, 0 for very small
children, and 3 which is ideal for horizontal
bitewing projections
1
?
Make sure the patient is positioned with head supported
and occlusal plane horizontal to the floor
2
?
Assess the shape of patient’s dental arch to determine
number of films required
3
?
The tab or bite platform should be positioned in the middle
of the film packet and parallel to the lower and upper
edges of the packet
4
?
The tab is placed on the occlusal surfaces of the lower arch
5
?
The film packet should be positioned with its long axis
horizontally for a horizontal bitewing or vertically for a
vertical bitewing
6
?
The posterior teeth and the film packet should be in contact
or as close together as possible
7
?
The posterior teeth and film packet should be parallel and
the shape of the dental arch may necessitate two separate film positions to achieve this requirement for the premolars and molars
8
?
The patient is asked to close teeth firmly on the tab and to ensure that the film and film packet are in contact the operator pulls the tab between the teeth as the patient closes their teeth
9
?
X-ray beam is aimed directly through the contact areas
10
?
Exposure is made
11
PREMOLAR BITEWING PROJECTION are?
IMAGE FIELD
RECEPTOR PLACEMENT
PROJECTION OF CENTRAL RAY
POINT OF ENTRY
distal portion of the mandibular canine anteriorly
IMAGE FIELD
(PREMOLAR BITEWING PROJECTION)
equally the crowns of the maxillary and mandibular premolar
teeth
IMAGE FIELD
(PREMOLAR BITEWING PROJECTION)
place the receptor between the tongue and the teeth
RECEPTOR PLACEMENT
(PREMOLAR BITEWING PROJECTION)
far enough from the lingual surface of the teeth to prevent
interference by the palate on closing
RECEPTOR PLACEMENT
(PREMOLAR BITEWING PROJECTION)
parallel to the long axes of the teeth
RECEPTOR PLACEMENT
(PREMOLAR BITEWING PROJECTION)
anterior border of the receptor should extend beyond the
contact area between the mandibular canine and the first premolar
RECEPTOR PLACEMENT
(PREMOLAR BITEWING PROJECTION)
T or f
In PREMOLAR BITEWING PROJECTION (RECEPTOR PLACEMENT ) Hold the receptor in place until the patient’s mouth is completely closed. Holding the receptor while closing prevents it from being displaced distally.
T
adjust the horizontal angulation of the cone to direct the central ray to the center of the receptor through the premolar contact areas
PROJECTION OF CENTRAL RAY
(PREMOLAR BITEWING PROJECTION)
to compensate for the slight inclination of the receptor against the palatal mucosa, vertical angulation should be about +5 degrees
PROJECTION OF CENTRAL RAY
(PREMOLAR BITEWING PROJECTION)
line of occlusion at the point of contact between the second premolar and the first molar
POINT OF ENTRY
(PREMOLAR BITEWING PROJECTION)
distal surface of the most posterior erupted molar
IMAGE FIELD
(MOLAR BITEWING PROJECTION)
equally the crowns of the maxillary and mandibular molars
IMAGE FIELD
(MOLAR BITEWING PROJECTION)
True or false
MOLAR BITEWING PROJECTION
Because the maxillary and mandibular molar contact areas may not be open from the same horizontal angulation, they may not be visible on one receptor. In this case, it may be desirable to open the maxillary molar contacts because the mandibular molar contacts usually are open on the periapical receptors
T
place the receptor between the tongue and teeth as far as lingual as practical to avoid contacting the sensitive attached gingiva
RECEPTOR PLACEMENT
(MOLAR BITEWING PROJECTION)