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Abnormal eruption of permanent teeth is commonly a sequela of mandibular or maxillary trauma, eg, incisor avulsion fractures in cattle and horses in which the developing dental bud of the permanent tooth is damaged by the fracture itself or by the repair process. In horses, delayed eruption or impaction of cheek teeth is a common cause of apical osteitis and subsequent dental decay. This particularly affects the third cheek tooth (premolar 4 [108, 208, 308, and 408 in the Triadan numbering system]) in both the upper and lower arcades and is a sequela of mild dental overcrowding. Medial displacement of the third cheek tooth is another form of abnormal eruption due to overcrowding.
Last full review/revision March 2012 by Jack Easley, DVM, MS, DABVP (Equine); Gregg A. DuPont, DVM, Fellow AVD, DAVDC
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