No | Measurement | Definition |

1 | SNA | The anteroposterior position of point A relative to the anterior cranial base. |

2 | SNB | The anteroposterior position of point B relative to the anterior cranial base. |

3 | ANB | The difference between the SNA and SNB angles, and difine the mutual relationship, in sagital plane, of the maxillary and mandibular bases. |

4 | Mandibular plane angle | Angle formed by intersection of menton-gonion and orbita pororion lines |

5 | S vertical-U6 | Perpendicular distance from S vertical to the mesial convex point of the maxillary first molar |

6 | FH-U6 | Distance from FH plane to mesiobuccal cups tip of the maxillary first |