Asian has smaller jaws so wisdom tooth are often erupted in impacted position. Impacted wisdom tooth is basically tooth that fails to erupt fully in its expected position and instead malaligned with other molars. Impacted wisdom tooth grow in different position, towards or away from the adjacent molar and in horizontal or vertical position.
Here are the different classification of impacted wisdom tooth
It can also be classified by soft tissue or bony impactions. A "soft tissue" impaction is when the upper portion of a wisdom tooth (the tooth's crown) has penetrated through the bone, but has not yet erupted fully through the gums. A "bony" impaction is one in which wisdom tooth is still fully encased in the jaw's bone.
Source of information: Animated-teeth
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