Page 17
Air Techniques, Inc.
Usage
Bisection angle technique
The patient should hold the image receptor in
the mouth in the correct position The middle of
the radiation ray is set at right angles to an (esti-
mated) plane at half the angle between tooth
axis and image receptor
1
2
1 Image receptor
2 Tooth axis
Upper jaw front tooth exposure
X-ray is projected 45° downwards
Lower jaw front tooth exposure
X-ray is projected 25° upwards
Upper jaw molar and premolar exposure
X-ray is projected 25° upwards
9.2
Positioning patient, X-ray
unit and image receptor
CAUTION
Injuries to the oral cavity
Sharp-edged receptors can cause inju-
ries to the oral cavity
• Careful positioning of the image re-
ceptor into the patient's oral cavity
• Allow the patient to sit down
• Position the image receptor inside the oral
cavity
• Position the x-ray unit
CAUTION
Image quality insufficient
If the x-ray unit is moved or if the patient
moves during exposure then the images
will not be usable
• The patient should sit quite still during
x-ray exposure
• The x-ray unit must not be moved in
any way during exposure
The image receptor can be any of the following:
– Film
– Sensor
– Image plate
Ensure that the image receptor is
placed within the x-ray field
Place the tube close to the skin
Parallel techniques
Position the image receptor using a holder sys-
tem for parallel techniques
1
2
1 Image receptor
2 Tooth axis
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