The terms orthodontia and irregularities of the teeth conventionally carry with them the idea of irregular teeth in children and youth, connected with their treatment for correction. The causes are usually hereditary, but may be acquired. One could quote from writers from Etruscan days down to the present time and give the opinion of more than fifty authors, but their definitions of the etiology would most likely each differ somewhat from the other.There have been handed down to us such explanations as "She inherited large teeth from one parent and small jaws from the other," or "His baby teeth were not extracted soon enough," or "Were taken out too soon." "Lack of absorption of the roots of the temporary teeth, while the growth of the permanent set is rapid," etc. One author thinks "the development of the hind end of the jaw does not keep pace with the absorption
FLETCHER MH. PATHOLOGIC IRREGULARITIES. JAMA. 1904;XLIII(2):105–108. doi:10.1001/jama.1904.92500020002b
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