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I've read this article several timesbut can't figure out what much of it means. It's not even clear what "the apical movement of the geometric center of the root (centroid) in respect to the occlusal plane or plane based on the long axis of tooth" means; is it up-down, forward-backward, or side to side? A few illustrations and even photos (if not too gross!) would help understanding. Roger (Dodger67) ( talk) 08:06, 5 February 2017 (UTC)