| 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 positioning arm extending there between. The bite block carries a journal or barrel for receiving a portion of the positioning arm therein such that the portion 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 of 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 the positioning arm is positioned such that the user can view the indicia to determine the x-ray image for which the device is set. |
