Crown and root resorption of a maxillary permanent first molar by an impacted second premolar: a case report.

A case is described of resorption of the mesial aspect of a maxillary permanent first molar in a 13-year-old boy whose maxillary second premolar was impacted. The premolar was partially erupted in the line of the arch and radiography revealed a radiolucent area involving enamel, dentine and cementum on the mesial aspect of the first molar. The first molar was extracted and the premolar erupted normally. The case emphasizes the importance of early diagnosis of developmental abnormalities.