METHOD AND SYSTEM FOR DETERMINING A FORCE AND/OR TORQUE APPLIED TO AN ORTHODONTIC BRACKET

摘要

A method and system are disclosed for analyzing images of fiducials that provide an indication of the forces and/or torques applied to an orthodontic bracket. The mass of each of the pixels forming the fiducial image are multiplied by the square of the distance of the pixel along the image's x axis, the product of the distances of the pixel along the image's x and y axes, and the square of the distance of the pixel along the image's y axis. The second order moments of inertia about the centroid of the fiducial are calculated and used to form a first matrix. The first matrix is diagonal i zed into a second matrix, from which the fiducial 's first and second principal axes are determined. These axes are then used to measure the size of the fiducial in the image.