ANGLES SYSTEM OF CLASSIFICATION

Angles classification was based on the mesiodistal relationship of the teeth, dental arches and jaws. According to angle, the maxillary first permanent molar is the key to occlusion. He considered these teeth as fixed anatomical points within the jaws.. 

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Angle's class I: It is characterised by the presence of a normal inter arch molar relation.

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Angle' s class II: It is characterized by a molar relation where the distobuccal cusp of the upper first permanent molar occludes in the buccal grove of the lower first permanent molars.

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Class II division 1: Proclined upper incisors with a resulatant increase in overjet.

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Class II division 2: Lingually inclined upper central incisors and labially tipped upper lateral incisors overlapping the central incisors.

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Class II subdivision: when a class II molar relation exists on one side and class I relation on the other.
Class III malocclusion: With mesiobuccal cusp of the maxillary first permanent molar occluding in the interdental space between the mandibular first and second molars.

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True class III: Occurs due to,

1. Excessively large mandible
2. Forwardly placed mandible
3. Smaller than normal maxilla
4. Retropositioned maxilla
5. Combination of the above cases

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Pseudo class III : This type of maloccusion is produced by a forward movement of the mandible during jaw closure, thus it is also called postural or habitual class III malocclusion.