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OCCLUSAL EXAMINATION | Up
Dental Technican, Volume 2 - Dentist training manual for military dentists | Next
INFECTION CONTROL |
Figure 1-37.—Typical maxillary anterior occlusal radiograph.
and bitewing packets, the occlusal packet contains two
X-ray films. This allows different developing times to
be used for these films. The finished radiographs can
then be compared for diagnostic purposes.
Occlusal radiographs are exposed using the
bisected angle technique.
MAXILLARY OCCLUSAL RADIOGRAPHS
Maxillary occlusal radiographs are taken by using
the following procedures:
1. Set the X-ray machine at 10 mA, 90 kVp, and 60
impulses (1 second). (Reduce the kilovoltage 5 kVp if
the arch is edentulous. Use 70 kVp if the patient is a
child.)
2. Position the patient so that the ala-tragus line is
parallel with the floor, and the mid-sagittal plane is
perpendicular to the floor.
3. Place the film in the patient's mouth. Occlusal
films are normally very comfortable. Have the patient
relax the muscles of the mouth and cheek as much as
possible. The pebbled surface of the packet should be
toward the occlusal surfaces of the maxillary teeth, and
the narrow side of the packet toward the patient’s
cheeks. To place the packet, retract one corner of the
patient’s mouth until the packet can be inserted. Position
the packet far enough in the mouth so that it covers all
the teeth. Special care must be taken to avoid gagging
the patient. Have the patient close gently but firmly on
the packet to hold it in place.
4. Position the tube head.
a. For maxillary anterior occlusal radiographs,
set the vertical angulation of the tube head at +65°.
Center the tube head cylinder on the bridge of the
Figure 1-38.—Projection of central ray (CR) for maxillary
anterior occlusal radiographs.
patient's nose so that the central X-ray beam will be
projected as shown in fig. 1-38.
b. For maxillary posterior occlusal
radiographs, set the vertical angulation of the tube head
at +75°. Center the tube head at the top of the patient's
nose so that the central X-ray beam will be projected as
shown in fig. 1-39.
5. Make the exposure.
MANDIBULAR OCCLUSAL
RADIOGRAPHS
Mandibular occlusal radiographs are taken by
using the following procedures:
1. Program the X-ray machine for 10 mA, 90 kVp,
and 60 impulses (1 second). (Reduce the kVp setting for
edentulous patients and children as discussed earlier.)
Figure 1-39.—Projection of central ray (CR) for maxillary
posterior occlusal radiographs.
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