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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Int J Oral Maxillofac Surg. 2015 Dec 18;45(3):399–405. doi: 10.1016/j.ijom.2015.11.013

Fig. 16.

Fig. 16

Limitations of the orthogonal best-fit method. (A) A perfectly symmetrical subject. (B) The subject develops unilateral (right) condylar hyperplasia, causing her jaw to shift 8 mm to her left. Because her jaw grows fast, the rest of the face, including the upper jaw, remains unchanged. (C) A computer builds a sagittal plane using the orthogonal best-fit method (blue line). On evaluating the face using this sagittal plane, it will be concluded that the upper jaw is right-deviated by 3 mm and that the chin is left-deviated by 5 mm. We know this is not true; only the lower jaw is deviated.