Class 2 div2.pptx - CLASS II DIV 2 MALOCCLUSION CLASS II INCISOR RELATIONSHIP When the lower incisor edges occlude posterior to the cingulum plateau of

Class 2 div2.pptx - CLASS II DIV 2 MALOCCLUSION CLASS II...

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CLASS II DIV 2 MALOCCLUSION
CLASS II INCISOR RELATIONSHIPWhen the lower incisor edges occlude posterior to the cingulum plateau of the upper incisors.
CLASS II DIV 2Upper central incisors are retroclinedUsually overjet minimalBut may be increased
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CLASSIFICATIONClass II div 2 type a: The central incisors are tipped lingually, the laterals are in labioversion or labially inclinedClass II div 2 type b: All 4 incisors are tipped lingually and the canines are in mesio-labioversion
Class II div 2 type c: Lingoversion of all 6 anterior teethClass II div 2 type d: Mixed type of frontal malposition with lingually inclined incisors on one side
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ETIOLOGY
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1. SKELETAL PATTERN:Mild Class II skeletal patternUpper incisors usually lie outside the controlof the lower lip, resulting in a Class II division 1But where the lower lip line is high relative to the upper incisors a Class II division 2 malocclusion can result
Reduced vertical dimension:Also important in the etiology of Class II division 2 malocclusionsVertical dimension is typically is reducedIncreased overbite
A reduced lower facial height is associated with a forward rotational pattern of growthMandible becomes more prognathic with growthIt is helpful in reducing the severity of a Class II skeletal patternIt also has the effect of increasing overbite
2. SOFT TISSUE:Decreased lower facial heightLower lip line will be higherCausing retroclination of upper incisorsLaterals may escape this action due to small crown height
DENTAL FACTORS

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