Angle's classification of malocclusion
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Transcript of Angle's classification of malocclusion
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ANGLE’S CLASSIFICATION OF MALOCCLUSION
EDWARD ANGLE , 1899
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FIXED ANATOMICAL LANDMARK WITHIN THE
JAWS
KEY TO OCCLUSION
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CLASS I
CLASS II
CLASS III
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ANGLE’S CLASS I MALOCCLUSION
Normal Skeletal RelationNormal Muscle Function
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ASSOCIATED DENTAL IRREGULARITIES
CROWDING
SPACING
ROTATION
MISSING TOOTH
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CLASS I BIXALLIARY PROTRUSION
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ANGLE’S CLASS II MALOCCLUSION
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CLASS II , division 1
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CLASS II , division 1
Abnormal Muscle Activity
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CLASS II , division 1
Abnormal Muscle Activity
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CLASS II , division 1
Abnormal Muscle Activity
Lower lip cushion’s the palatal aspect of the upper teeth
LIP TRAP
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CLASS II , division 1
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CLASS II , division 1
‘V’ SHAPED ‘U’ SHAPED
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CLASS II , division 2
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CLASS II , division 1
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CLASS II , division 2
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CLASS II , division 2
Squarish appearance
Traumatised mandibular labial gingiva
Normal perioral muscle activity
Abnormal path of closure may be present
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CLASS II , division 2
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LEFTRI
GHT
CLASS II , subdivision
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CLASS III MALOCCLUSION
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CLASS III MALOCCLUSION
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1) Excessively Large Mandible
TRUE CLASS III
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2) Forwardly Placed Mandible
TRUE CLASS III
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3) Retro-positioned maxilla
TRUE CLASS III
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4) Smaller than Normal Maxilla
TRUE CLASS III
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Class III Malocclusion
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• Due to forward movement of the mandible during jaw closure
POSTURAL / HABITUAL Class III
PSEUDO CLASS III
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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
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RIGHT
LEFT
CLASS III , subdivision
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CLASS III , Subdivision
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THANK YOU !