Definition of the reference points and measurement parameters in CBCT images

Reference points (abbreviation) and parameters | Definition |
---|---|

Reference points | |

A | The inflection point from the concave glenoid fossa to the flat posterior slope of the articular eminence. |

B | The inflection point from the convex articular eminence to the flat posterior slope of the articular eminence. |

C | Top of the articular eminence. |

Incisor function point F1 | Cervically located point of inflection from the convexity of the tuberculum to the concavity of the palatal surface. |

Incisor function point F2 | Point at the intersection of the lingual concavity with the back side of the incisal edge. |

Measurement parameters | |

Articular angle α | Angle between A–B line and the FH plane. |

Articular angle β | Angle between A–C line and the FH plane. |

Condylar axis angle | Angle between the condylar axis and the midsagittal plane. |

Superior joint space | Shortest distance between the fossa roof and the superior condylar point. |

Anterior joint space | Shortest distance from the most prominent anterior point of the condyle to the glenoid fossa. |

Posterior joint space | Shortest distance from the most prominent posterior point of the condyle to the glenoid fossa. |

Anterior guiding angle | Angle between the incisor function point F1–F2 and FH plane. |

CBCT, cone-beam computed tomography; FH plane, Frankfurt horizontal plane.

Oral Biol Res 2023;47:140~150 https://doi.org/10.21851/obr.47.04.202312.140

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