S-N-A angle

S-·N-·A an·gle

in cephalometrics, an angle measuring the anteroposterior relationship of the maxillary basal arch on the anterior cranial base; it shows the degree of maxillary prognathism.
See also: subspinale.
[sella-nasion-subspinale (or point A)]

S-N-A an·gle

(anggĕl)
In cephalometrics, an angle measuring anteroposterior relationship of maxillary basal arch on anterior cranial base; shows degree of maxillary prognathism.