Figure 4-19. Anterior instrument assemblage.
(1) The shielded or printed side of the film packet is placed against the
backing support of the bite-block.
(2) It is inserted vertically into the slot by using a downward motion and, at
the same time, placing slight pressure against the backing support to open the slot.
(3) There is an embossed dot on the corner of the periapical film. This
embossed dot is always placed in a downward position when placing the film into the
slot on the plastic bite-block.
(4) The offset position of the indicator rod is held away from the biting
surface of the block and the pins are inserted in the proper holes.
The plastic locator ring is fitted onto the indicator rod opposite the film
The assembly is then positioned in the mouth.
b. Posterior Instrument. The posterior instrument (see figure 4-20) is
assembled and used as follows.