pISSN 2234-7518

eISSN 2005-372X

eISSN 2005-372X

Definitions of the craniofacial planes evaluated in the present study

Plane | Definition | Landmark |
---|---|---|

Horizontal planes related with cranium | ||

Broadbent’s plane (SN plane) | The plane passing from nasion to sella and perpendicular to midsagittal plane (as known as S-N plane) | S, N, MS plane |

Optical axis plane | The plane constructed by 3 points; both lens and optic nerve | L (both), ON |

Horizontal planes related with midface | ||

Camper’s plane | The plane constructed by 3 points; both ala and mid-tragus | MidTr, Al (both) |

His’ plane | The plane passing from anterior nasal spine to opisthion and perpendicular to midsagittal plane | ANS, Op, MS plane |

Frankfort horizontal plane (FH plane) | The plane constructed by 3 points; both orbitale, mid-porion | Or (both), MidPo |

Occlusal plane | The plane passing the mid-incisor tip of maxilla and mesiobuccal cusp of upper molars on both side | U1, #16 & 26 MBC |

Sagittal planes related with midface | ||

Nasal axis plane | A sagittal plane divides the nose into right and left halves, constructed by 3 points; nasion, columella, and mid-alar | N, Col, MidAlar |

Horizontal planes related with lower face | ||

Mandibular symmetry plane | A sagittal plane divides the mandible into right and left halves, constructed by 3 points; genial tubercle, menton, mid-incisor tip of mandible | GT, Me, L1 |

Mandibular plane | Drawn from the most inferior border of the ramus of the mandible to menton | Go (both), Me |

Lip canting plane | The plane passing through both side of cheilions and mid-cheilion | Ch (both), MidCh |

Reference planes | ||

Midsagittal plane (MS plane) | A sagittal plane through the nasion and perpendicular to Frankfort horizontal plane | N, FH plane |

N-perpendicular plane | A coronal plane passing the nasion and perpendicular to Frankfort horizontal plane and midsagittal plane | N, FH plane, MS plane |

See Table 1 for definitions of each landmarks.

Korean J Orthod 2020;50:258~267 https://doi.org/10.4041/kjod.2020.50.4.258

© Korean J Orthod

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