Maxillary central and lateral incisors are the primary victims of intrusions and this seems to be identical to other trauma types and is possibly related to the known exposure to impacts of maxillary incisors. The age group of 6-12 years of age was most frequently involved and boys appeared to experience intrusion injuries more frequently than girls, and at an earlier age. The majority of intruded teeth were displaced 2-8 mm. ![]() Most often one tooth was intruded (46.3%), followed by two teeth (32.4% ) and three or more teeth (21.3%). ![]() A few cases were combinations of intrusion and either crown/root-fractures or root fractures (6%). The most common injury patterns were intrusion without additional injuries (33.5%) and intrusion with crown fractures (60.5%). The main etiologic factor appeared to be falling which resulted in axial impacts on maxillary or mandibular teeth. This analysis showed that intrusion of permanent teeth was of rare injury only affecting 1.9% of traumatic injuries involving permanent teeth. An epidemiological study of traumatic intrusion of permanent teeth was performed on 216 teeth in 151 patients treated over a 50-year period at a major trauma center in Denmark (Copenhagen).
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