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SOMI Chapter 11
Mandible, Zygomatic Arches, TMJs
| Question | Answer |
|---|---|
| How much head rotation on the axiolateral oblique is required to best demonstrate the mentum? | 45 degree rotation |
| How many degrees must the head tilt and central ray angulation combine to make in the axiolateral oblique mandible? | 25 degrees combined |
| What degree of rotation is required for a general survey of the mandible in the axiolateral oblique? | 10-15 degrees |
| Which side are you looking at in the axiolateral oblique projection of the mandible? | the side closest to the IR |
| Which positioning line do you need perpendicular to the IR for a PA mandible? | OML |
| Where is the CR centered for the PA mandible? | to exit at the junction of the lips |
| For an AP Axial (Towne) method of the mandible what is the caudal angle range? | 35 degrees if OML perpendicular to IR and 42 degrees if IOML is perpendicular to IR |
| Where does the CR enter for the AP Axial (Towne) for the mandible? | 1" superior to the glabella |
| Which positioning line is perpendicular in the PA (modified waters) projection for the mandible? | LML |
| Where does the CR exit in the mandible's PA (modified waters) projection? | acanthion |
| What positioning line is parallel to the IR for the SMV (full basal) projection of the mandible? | IOML |
| Where do you center the CR for the SMV (full basal) of the mandible? | midway between angles of mandible or at a level 1 and 1/2 inches below the mandibular symphysis |
| What is the kVp range for the SMV (full basal) projection of the Zygomatic Arches? | 70 to 80 kVp |
| What positioning line is perpendicular to the IR in the parietoacanthial (Waters) projection of the Zygomatic Arches? | MML |
| For an AP axial (modified Towne) method of the Zygomatic Arches what is the caudal angle range? | 30 degrees if OML perpendicular to IR and 37 degrees if IOML perpendicular to IR |
| Where is the CR directed for the AP axial (modified Towne) projection for Zygomatic Arches? | center 1 inch superior to the nasion to exit at the level of the gonion |
| What positioning line is parallel to the IR for the oblique inferosuperior (tangential) projection of the Zygomatic Arches? | IOML |
| How is the head positioned for the oblique inferosuperior (tangential) projection Zygomatic Arches? | rotate head 15 degrees toward side to be examined; also tilt chin 15 degrees toward side of interest |
| From the true lateral position how much and which way is the face rotated for the axiolateral oblique (modified Law)? | rotate face toward the IR 15 degrees |
| Which way and how much is the CR angled for the axiolateral oblique (modified Law)? | 15 degree caudad |
| Where is the CR directed for the axiolateral oblique (modified Law)? | 1.5 inches superior to the upside EAM |
| In the axiolateral (modified Schuller) projection the head is in a true lateral position, what positioning line is perpendicular to the IR? | IPL |
| What angle and direction is the CR for the axiolateral (modified Schuller) projection? | 25 to 30 degree caudad |
| Where is the CR directed for the axiolateral (modified Schuller) projection? | 1/2 inch anterior and 2 inches superior to upside EAM |
| Where is CR directed for the AP axial (modified Towne) of the TMJs? | 3 inches superior to the nasion |