15. Appendices
180 Green Smart User Manual
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 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).
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