E.H. Angle introduced his classification of malocclusion in:
ANGLE'S CLASSIFICATION OF MALOCCLUSION
In 1899, Edward Angle classiﬁed malocclusion based on the mesial-distal relation of the teeth, dental arches and jaws. He considered the maxillary ﬁrst permanent molar as a ﬁxed anatomical point in the jaws and the key to occlusion.
Ref: Textbook of orthodontics Gurkeerat Singh 2nd ed page no 163
1876
1900
1899
1903