pISSN 2234-7518

eISSN 2005-372X

eISSN 2005-372X

Definition of the cephalometric skeletodental and airway variables

Variable | Definition | ||
---|---|---|---|

Skeletodental | A-VRP (mm) | Distance between point A (A) and vertical reference plane (VRP) | |

SNA (°) | The angle between Sella-Nasion (SN) plane and Nasion-A plane | ||

A-N perp (mm) | The shortest linear distance between A and N-perpendicular line | ||

PNS-HRP (mm) | Distance between posterior nasal spine (PNS) and horizontal reference plane (HRP) | ||

PNS-VRP (mm) | Distance between PNS and VRP | ||

SNB (°) | The angle between SN plane and Nasion-B plane | ||

B-N perp (mm) | The shortest linear distance between point B and N-perpendicular line | ||

SN-Pog (°) | The angle between SN plane and Nasion-Pogonion (Pog) plane | ||

Pog-N perp (mm) | The shortest linear distance between Pog and N-perpendicular line | ||

ANB (°) | The angle between Nasion-A plane and Nasion-B plane | ||

EMxL (mm) | Distance between condylion (Co) and A | ||

EMnL (mm) | Distance between Co and Pog | ||

PP-FH (°) | The angle between palatal plane and Frankfort horizontal (FH) plane | ||

MP-FH (°) | The angle between FH plane and mandibular plane (MP) | ||

LFH (°) | The angle between anterior nasal spine (ANS)-geometric left of the ramus (Xi) plane and Xi-protuberance menti (Pm) plane | ||

Overjet (mm) | Horizontal distance between incisal edges of maxillary and mandibular incisors | ||

U1-SN (°) | The angle between the SN plane and the axis of upper central incisor | ||

U1-FH (°) | The angle between the FH plane and the axis of upper central incisor | ||

L1-MP (°) | The angle between MP and the axis of lower central incisor | ||

Airway space | Hyoid bone | H-RGN (mm) | Distance between hyoidale (H) and retrognathion (RGN) |

MP-H (mm) | Distance along perpendicular line from H to MP | ||

H-PTV (mm) | Distance along perpendicular line from H to pterygomandibular vertical plane (PTV) line | ||

H-C3Me (mm) | Distance along perpendicular line from H to the third vertebrae (C3)-Menton (Me) line | ||

Tongue | TGL (mm) | Tongue length (distance between base of the epiglottic fold [Eb] and tongue tip [TT]) | |

TGH (mm) | Tongue height (maximum height of line perpendicular to Eb-TT line at tongue dorsum) | ||

Td-PP (mm) | Distance along perpendicular line from tongue dorsum (Td) to palatal plane | ||

TT-PTV (mm) | Distance along perpendicular line from TT to PTV line | ||

Soft palate | SPL (mm) | Soft palate length (distance between PNS and tip of the soft palate [P]) | |

SPT (mm) | Soft palate thickness (maximum thickness of soft palate measured on line perpendicular to PNS-P) | ||

SPA (mm) | Soft palate angle (angle between P-PNS and palatal plane) | ||

P-PTV (mm) | Distance along perpendicular line from P to PTV line | ||

Pharyngeal airway | SPAS (mm) | Superior posterior airway space (width of airway behind soft palate along line parallel to gonion [Go]-B plane) | |

MAS (mm) | Middle airway space (width of airway along line parallel to Go-B line through P) | ||

IAS (mm) | Inferior airway space (width of airway along Go-B line) | ||

VAL (mm) | Vertical airway length (distance between PNS and Eb) | ||

PNS-ad1 (mm) | The distance between PNS and Ad1 (the point where PNS-Basion [Ba] line intersects the posterior pharyngeal wall) | ||

PNS-ad2 (mm) | The distance between PNS and Ad2 (the point where a line perpendicular to Sella [S]-Ba plane passing through PNS intersects the posterior pharyngeal wall) |

Korean J Orthod 2020;50:238~248 https://doi.org/10.4041/kjod.2020.50.4.238

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