Gnathion

歯科矯正学で用いるセファロ分析の計測点の一つ。グナチオン。顔面平面 (Na-Pog)と下顎下縁平面となす角の二等分線がオトガイ隆起前縁と交わる点。on the born Gnathion, gnathion is the point of intersection of facial and mandibular planes.