Test 2 - Mandible Body Projections

PA Projection.

• Center MSP

• Rest nose and chin against IR

• AML is near perp. to IR

• CR perpendicular to exit the lips

• Shows mandibular body symmetrical on each side

PA Axial Projection

• Rest nose and chin on IR, center MSP

• Angle CR 30 degrees cephalad and enters midway between the TMJs

• IR centered to CR

  Evaluation Criteria:

• Include from TMJs and rami to the body

• TMJs are inferior to mastoid process

• No rotation, symmetric rami

How many possibitlies are there for body?

2 Possibilities

PA and PA Axial

Lateral

• Put head in a true lateral and extend neck so the mandibular body is parallel with the IR

• Rotate face (MSP) 30 degrees toward IR

• Angle CR 25 degrees cephalad

• CR passes through mandibular region of interest

• (Merrill’s says to oblique the patient to avoid shoulders)

Evaluation Criteria:

• body of mandible from symphysis to TMJ with no overlap of opposite side or by c-spine