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Difference in registration of the 3D photography to two CBCTs taken at the same day. A and B, First CBCT acquisition registered to 3D photograph taken the same day. C and D, Second CBCT acquisition taken the same day. Note that even though it the photograph and the CBCT surface model appear to be registered at the forehead, the contours of the CBCT lower lip, chin and neck do not match the contours of the 3D photograph due to subtle differences in facial expression and head posture.
