Ectopic Eruption Pattern in Selected Permanent Teeth

¹ Department of Pedodontics, State University of Iowa, Iowa City, Iowa

This paper describes ectopic eruption of permanent central incisors, lateral incisors, and first molars in a selected sample of 315 case records in which there was radiographic evidence of ectopic eruption of at least one tooth. These selected subjects were boys and girls, almost exclusively of the Caucasian race, who lived in Iowa City, Iowa, or its vicinity and whose records fulfilled specified criteria. Ectopic eruption of more than one class of permanent tooth was observed in about one-third of the subjects. The most frequently observed combination was of central and lateral incisor. Equal numbers of subjects exhibited ectopic eruption of central incisors only or lateral incisors only. Typically, more than half these subjects had 2 or more ectopically erupting teeth in the class concerned. Mandibular lateral incisor teeth were the most frequently observed ectopic eruption specimens, mandibular first molars the least. Ectopic eruption of individual teeth tended to occur as often bilaterally as unilaterally in the same arch, except for maxillary central incisors, in which bilateral involvement was observed twice as frequently as unilateral. Quadrants in which ectopic eruption of a central incisor was observed also revealed additional lateral incisor or first molar involvement in the same quadrant in about 20 per cent of upper and over 25 per cent of lower quadrants. Twenty per cent of subjects with ectopic eruption of a maxillary central incisor also showed additional involvement of a maxillary lateral incisor or maxillary first molar. Subjects with ectopic eruption of a mandibular lateral incisor showed additional involvement of a lateral incisor or first molar in the same arch in almost one-third of cases.

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