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Geometrical interpretation for abnormal facial behaviour with possible correction of angle S‐N‐A and S‐N‐B
Author(s) -
SARHAN O.A.,
ALBALKHI K.M.
Publication year - 1993
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1993.tb01605.x
Subject(s) - nasion , superimposition , centroid , craniofacial , line (geometry) , radiography , skull , geometry , mathematics , cephalometry , orthodontics , anatomy , artificial intelligence , medicine , computer science , surgery , psychiatry
The orientation of the sella nasion (SN) line in lateral skull radiographs is important for accurate assessment of antero‐posterior and vertical facial relationship. Lateral skull radiographs of a random sample were traced and digitized to produce a mean shape template of the sample, with the craniofacial centroid line (CFC) used as a base for superimposition of the sample. A geometrical triangle was formed using the sella nasion line, craniofacial centroid line and the mandibular plane as the sides of the triangle. Simple geometric calculations were done to re‐orient both the mandibular plane and sella nasion line in cases with balanced clinical profiles, while the S‐N‐A and S‐N‐B measurements indicate otherwise.