Sensor Positioning - Planmeca ProX User Manual

10 Sensor positioning

10 Sensor positioning
Bisecting angle technique
Paralleling technique
20 Planmeca ProX
The bisecting angle technique is the most commonly used technique in
veterinary imaging for its accurate representation of the tooth and roots.
In the bisecting angle technique:
• The sensor (1) is placed as parallel as possible to the tooth roots.
• The X-ray beam is directed perpendicularly towards an imaginary line (2)
which bisects the angle between the sensor plane and the long axis of
the tooth (3).
Note, if the angle between the sensor and the X-ray beam is incorrect, the
image will be distorted because the beam will create an image that is longer
or shorter than the imaged object.
The paralleling technique results to a very accurate image, but is only useful
for the caudal mandibular cheek teeth because:
• Dogs and cats do not have an arched palate and that is why the
maxillary teeth cannot be imaged with the paralleling technique.
• The mandibular symphysis interferes the sensor placement parallel to
the tooth roots of the mandibular canines and incisors as well as the
rostral mandibular premolars.
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