Studies on Moire topography analysis of pre-and post-operation changes of facial morphology in jaw deformities

Abstract

Moiré topography is a nonexposed, inexpensive and easily operated technique for 3-D facial recording. However, there are still some arguments regarding the geometric distortions of the method itself and positioning remained.
A computer system, designed for measuring the changes in facial integument before and after surgery on jaw deformities is developed in this study. First procedure of this program is in regard to correcting the distortion caused by its central prospective geometry while the second procedure is concerned with mathematical transformation of distorted coordinates to their corrected estimate in the standard orientation.
This system is tested for the reliability of the 3-D reconstructed image of the object from the Moire pattern and accuracy of the orientated standardization.
The result revealed that the difference of the recon
structed shape was within 3% in volumetric measure from the known objects and the measurement error for the orientated distortion was less than 1mm in all three x-y-z coordinates after mathematical correction.These results suggest that the precised evaluation of facial morphological changes is possible in clinical application by using the standard points in this system for the Moire topography.