The patient must bite down on the bite block as far away from the teeth as possible, using the full extent of the bite block to maintain a parallel relationship between the image receptor and the teeth in all regions of the oral cavity EXCEPT the:
a. maxillary incisors and canines.
b. mandibular incisors and canines.
c. maxillary premolars and the maxillary molars.
d. mandibular premolars and the mandibular molars.
d. The patient must bite down on the bite block as far away from the teeth as possible, using the full extent of the bite block. The exception to this rule is for the mandibular premolar and molar regions, where the image receptor can be close to the teeth and still remain parallel because of the nearly vertical position of the mandibular premolars and the slightly inward inclination of the mandibular molars.
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