Australasion society for human biology annual conference edition:23 location:Kingstown Barracks, Rottnest Island, Australia date:1-4 December 2009
The treatment objectives for reconstructive procedures in children with craniofacial dysmorphologies are to achieve normality. Currently ‘normality’ is defined by a set of averaged facial anthropometric data either based on averaged distances of skeletal landmarks retrieved from plain head films or facial anthropometrics. The advent of high dimensional capture of facial profile with three-dimensional surface scanners, computing power and geometric morphometrics has facilitated a statistical analysis of spatial relationships of faces. In collaboration with the Cranio-Maxillo-Facial Unit at PMH and the Melbourne Dental School we have established the first objective means to generate virtual threedimensional‘normalised’ facial profiles of patients (a normal equivalent) to be used as a primary surgical objective in cranio-maxillo-facial reconstructive procedures.
This has been achieved by ‘mapping’ a patient’s 3D image to a reference range that is referred to as a ‘normative face space’. The patient ‘mapped’ facial manifold is statistically fitted to the normal face space to establish the confidence limits of variation for all vertices (9000 pts). By applying thresholding to these confidence intervals the dysmorphic parts of the face can be isolated and colour coded images/maps generated that assist the treating clinician to define the problem. The use of statistical generated normal equivalent patient images is rapidly being introduced into clinical practice, despite
being still in a development phase.
Walters M., Claes P., Clement J., Sillifant P., Gillett D., ''High-dimensional statistical analysis of three-dimensional facial images in the treatment of craniofacial dysmorphologies at PMH'', HOMO - journal of comparative human biology, vol. 61, no. 3, pp. 220, 2010 (Australasion society for human biology 23rd annual conference, December 1-4, 2009, Kingstown Barracks, Rottnest Island, Australia).