Radiographic TechniqueCâu 50 / 100
Using the bisecting technique, how does vertical angulation differ between maxillary and mandibular projections?
a.Both arches always use 0 degrees
b.Maxillary projections use negative angulation and mandibular projections use positive angulation
c.Both arches use the same positive angulation
d.Maxillary projections use positive (downward) angulation and mandibular projections use negative (upward) angulation
Giải thích
Maxillary projections require the beam to be directed downward, which is a positive vertical angulation, while mandibular projections require an upward, negative angulation. Using 0 degrees for both would badly distort tooth length. Reversing the two, or applying the same positive value to both arches, produces elongation or foreshortening depending on the arch.
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