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According to the presence or absence of skeletal deformities there are two types of malocclusion: Simple Are free from facial deformities corrected by orthodontic appliances Complex Are present skeletal deformities corrected by surgical treatment or tooth extraction According to the relationships of the jaw: Orthognathic The jaw is in the normal relationships Retrognathic The lower jaw is posterior to normal facial relationships (retrusive) Prognathic The mandible is anterior (protruded) to normal facial relationships (protrusive)