MANDIBULAR MOLARS LESSON 4

Position the posterior instrument assembly with the plastic bite-block centered on the second molar (see figure 4-25). Assure that the anterior edge of the film is adjacent to the distal end of the second bicuspid. Ensure that the film is parallel with the long axis of the molar teeth. Place a cotton roll between the block and the opposing maxillary teeth and have the patient close his teeth holding the film in place. Slide the locator ring along the indicator rod bringing it close to the skin surface and align the x-ray unit extension tube with both the rod and the ring on the horizontal and vertical planes.