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There were no differences in magnitude and speed for maximal smile, cheek puff, and lip purse between the two captures for all participants. For individual expressions, maximal smile expression had the highest similarity value for individual landmarks.

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This presentation will illustrate the recent innovations in 3D stereophotogrammetry to provide a useful technique for accurate recording of the face dysmorphology in children with cleft lip and palate and patients with facial deformities who have had orthognathic surgery. Using a custom developed software program facial landmarks were digitised on the computerised 3D model, Procrustes analysis was applied to superimpose the 3D co-ordinates of anatomical landmarks at different time intervals. Principal component statistical analysis was applied to assess the magnitude of surgical changes. The method was accurate to within 0.5 mm and has been shown to be reliable in infants. Significant soft tissue changes were detected following orthognathic surgery; these were stable at 6 months following surgery when compared with the immediate postoperative appearance. The validity of automatic tracking of anatomical landmarks during facial animations has also been investigated using Di4D software. This presentation will highlight the clinical applications of 4D imaging and debate the accuracy of 3D prediction planning for correction of dentofacial deformities.