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The EIR progression rate has not been described previously. This case report describes rapidly progressive EIR in an impacted maxillary canine after surgical exposure and application of directional orthodontic traction over 8\u00a0months. The article discusses the etiologies of EIR, the possible reasons for EIR and its rapid progression in the presented case and proposes a new theory of the connection between EIR and tooth impaction.<\/jats:p>","DOI":"10.1111\/aej.12293","type":"journal-article","created":{"date-parts":[[2018,8,16]],"date-time":"2018-08-16T13:26:05Z","timestamp":1534425965000},"page":"259-264","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["External invasive resorption: Case report of a rapidly progressive process in an impacted maxillary canine during orthodontic treatment"],"prefix":"10.1111","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2397-417X","authenticated-orcid":false,"given":"Avi","family":"Shemesh","sequence":"first","affiliation":[{"name":"Department of Endodontics Israel Defense Forces (IDF) Medical Corps Ramat Gan 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