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16. Appendices
186 PaX-i3D Green Premium™ User Manual
assist with positioning the dental arches within the three dimensions of the focal trough,
an area where the anatomical structures will be imaged in relative clarity. Most
panoramic x-ray machines have a bite block to indicate the correct anterior-posterior
position or how far forward or back the patient should be positioned, side positioner
guides for determining the correct lateral alignment, and a chin rest to correctly locate
the superior-inferior dimension or how far up or down the chin should be positioned.
4,10
Panoramic x-ray machines are available with a mirror and laser light beam guide that
shines on the patient's face to illustrate various anatomical planes
(Figure 2) .
Incorrectly positioning the patient in any of these three dimensions will produce unique
and distinct radiographic image errors
(Table 1) .