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The mandibular condyles (Ar) and the gonial angles (Go) are on the lateral side of the face which are significantly separated from the midsagittal plane where the Menton (Me) is located. In this patient, the gonial angle (Ar-Go-Me) is measured as 132.6° 3-dimensionally (in red in the online version), while the projection of the gonial angle on the midsagittal plane is measured as 138.4° (in blue in the online version). (Color version of figure is available online.)
