angle's classification of malocclusion

ANGLE’S CLASSIFICATION OF MALOCCLUSION

EDWARD ANGLE , 1899

FIXED ANATOMICAL LANDMARK WITHIN THE

JAWS

KEY TO OCCLUSION

CLASS I

CLASS II

CLASS III

ANGLE’S CLASS I MALOCCLUSION

Normal Skeletal RelationNormal Muscle Function

ASSOCIATED DENTAL IRREGULARITIES

CROWDING

SPACING

ROTATION

MISSING TOOTH

CLASS I BIXALLIARY PROTRUSION

ANGLE’S CLASS II MALOCCLUSION

CLASS II , division 1

CLASS II , division 1

Abnormal Muscle Activity

CLASS II , division 1

Abnormal Muscle Activity

CLASS II , division 1

Abnormal Muscle Activity

Lower lip cushion’s the palatal aspect of the upper teeth

LIP TRAP

CLASS II , division 1

CLASS II , division 1

‘V’ SHAPED ‘U’ SHAPED

CLASS II , division 2

CLASS II , division 1

CLASS II , division 2

CLASS II , division 2

Squarish appearance

Traumatised mandibular labial gingiva

Normal perioral muscle activity

Abnormal path of closure may be present

CLASS II , division 2

LEFTRI

GHT

CLASS II , subdivision

CLASS III MALOCCLUSION

CLASS III MALOCCLUSION

1) Excessively Large Mandible

TRUE CLASS III

2) Forwardly Placed Mandible

TRUE CLASS III

3) Retro-positioned maxilla

TRUE CLASS III

4) Smaller than Normal Maxilla

TRUE CLASS III

Class III Malocclusion

• Due to forward movement of the mandible during jaw closure

POSTURAL / HABITUAL Class III

PSEUDO CLASS III

1 •Presence of Occlusal Prematurities

2 •In case of premature loss of deciduous posteriors, the child tends to move the mandible forward to establish contact in the anterior region

3 •Child with enlarged adenoids tends to move the mandible forward in an attempt to prevent tongue from contacting the adenoids

PSEUDO CLASS III

RIGHT

LEFT

CLASS III , subdivision

CLASS III , Subdivision

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