Villa Rotograph EVO, Руководство по обслуживанию

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SERVICE MANUAL
Troubleshooting
(Rev. 1) Rotograph EVO 8-63
6. The patient must extend the spine; this is normally obtained by
asking the patient to step forward, making sure that all other
conditions are unchanged. If not properly extended, the spine will
cause the appearing of a lower exposed area (clearer) in the front part
of the film.
7. The patient’s tongue must be positioned against the palate, otherwise
the air between the tongue and the palate will create a lower
absorbance area which will result on the film as a darker area which
in turn will hide the apex of the superior incisor teeth.
The result of all the above listed actions will be a radiography where all
the parts are properly exposed and are well identifiable as in the schema
of Figure 8-3.
Figure 8-3
It must be noted that radiography is quite symmetrical, with the
ascending rami of temporo mandibular joints almost parallel. The
occlusal plane is shown slightly tilted upward, the palatal plane does not
overlap the apex of the upper arch and therefore allows a good view of the
same.