... School, National School of Dentistry, National University of Mexico.§ Professor, Orthodontics Department, Graduate School, National School of Dentistry, National University of Mexico.This article ... growth of upper and lower jaw variations, as well as a bi-maxillary protru-sive profile typical of Mexican subjects, and bi-maxil-lary retruded profile representing the typical straight profile ... per-ception of surgical success at the end of treatment can depend more on the proper anterior-posterior position of the lower jaw to a greater extent than the position of the upper jaw in cases of...