A little history
Dr. Edward H. Angle is considered the father of the specialty of orthodontics. In 1892, he was the first to devote himself entirely to the teaching and practice of orthodontics. He was then a professor at the University of Minnesota. In 1900, he founded a private orthodontic teaching school in St. Louis. Dr. Angle described three classes of malocclusions based on the relationship between the upper and lower 1st molars.
Class I: normal molar relationship (no anteroposterior shift), but presence of dental irregularities, rotations, ectopias, space problems.
Class II: the lower dentition is shifted posteriorly (backwards or “distal”) with respect to the upper dentition, with or without dental irregularities.
Class III: the lower dentition is shifted anteriorly (forward or “mesial”) with respect to the upper dentition, with or without dental irregularities.
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