| 摘要 |
A positioning device for holding a dental x-ray imaging media during the taking of a dental x-ray includes an aiming ring, a bite block and a positio ning arm extending there between. The bite block carries a journal or barrel for receiving a portion of the positioning arm therein such that the portio n of the positioning arm thus received can rotate or move therein, such that the position between the bite block and the aiming ring can be selected in one of a plurality of positions corresponding to a position for taking one o f a plurality of dental x-ray images. In another embodiment, the bite block carries a window through which a color -coded or other indicia portion of th e positioning arm is positioned such that the user can view the indicia to d etermine the x-ray image for which the device is set.
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