Plane-form enamel hypoplasia

Plane-form enamel hypoplasia is often seen as the most severe type of enamel hypoplasia, and results from enamel matrix formation stopping, resulting in areas of crown with little or no dental enamel deposition. With plane form meaning the surface is smooth and flat. A relatively short period of severe stress can potentially lead to a very large defect. Plane-form enamel hypoplasia can be caused by a variety of factors, including severe illness/malnutrition, as well as specific conditions such as amelogenesis imperfecta and congenital syphilis. In severe cases enamel can be completely missing from areas of the crown, exposing the underlying dentine. This condition has been recorded in history since at least the 18th and 19th century. A study was done on a 15-year-old female that was alive during the 18th and 19th century, and she presented enamel hypoplasia.