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Malocclusion in human population is common and attempts to treat these conditions have been evident since early civilization. The description or classification of a condition is an essential requirement to determine the prevalence or severity of that condition in human populations. Although numerous attempts were made throughout the 19th century to classify malocclusion, it was not until the end of the century that widely accepted classification became more important to the dental profession.Edward H. Angle defined class I occlusion or neutroocclusion many years ago as the normal mesiodistal...