Quantitative Assessment Of Anatomical Change In The Human Dentition

1990 
This paper describes a computer method for aligning digitized images of teeth. Because teeth can not be accurately digitized directly in the oral cavity and because successive replicas of a surface can not be mounted in the digitizer with the same orientation, it is necessary to develop an algorithm which can move one surface relative to the other to optimize their alignment. The alignment is accomplished by forming a response surface based on the root mean squared distance between the two images as a function of the six transformation parameters. The Simplex algorithm is used to find the minimum of the response surface. New surface coordinates are determined using linear interpolation. A graphical interface and a personal computer provide easy interaction for the input and output of data.
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