MOLARS AND BICUSPIDS (POSTERIOR TEETH)

For radiographs of posterior teeth, adjust the head so that the occlusal surfaces of the maxillary teeth lie in a horizontal plane. Place a film packet in the mouth so that the resulting radiograph will include the desired teeth. The lower part of the film will lie between the tongue and the mandibular ridge; the upper part will lie against the roof of the mouth. Have the patient slowly close his teeth on the tab. Adjust tube to an average angulation of +8º. Direct the central ray to pass straight through the interproximal spaces to the center of the film at the level of the occlusal plane (see figure 4-29). Follow the manufacturer's instructions for exposure times.