Anb a point nasion b point indicates whether the skeletal relationship between the maxilla and mandible is a normal skeletal class i 2 degrees a skeletal class ii 4 degrees or more or skeletal class iii 0 or negative relationship. Landmarks are used as reference points to construct lines known as planes.
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Basion point in cephalometry. Position of deepest concavity on anterior profile of mandibular symphysis nb. According to the steiner analysis. A point a b point b pogonion pg gnathion gn menton me anterior nasal spine ans posterior nasal spine pns basion ba orbitale or gonion go articulare ar porion po pterygomaxillary fissure ptm cephalometric planes.
You can construct gonion by drawing a line along the lower border and down the posterior of the ramus then bisecting the angle the bisected angle is then projected to the mandible that point is gonion.