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Different geochronological methods place these hominins in the oxygen isotopic stage 21, between 0.8 and 0.85 million years ago (Ma). The immature individual H3 is represented by an almost complete midface (ATD6\u201069), preserving various teeth in situ. We used high\u2010resolution microtomograhy (mCT) to investigate the abnormal position of the left M<jats:sup>3<\/jats:sup>, virtually reconstruct M<jats:sup>2<\/jats:sup>, and M<jats:sup>3<\/jats:sup>as well as assessing the development stage of these. Finally, we compare this case with extinct and extant populations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Based on the identified signs, we suggest that individual H3 suffered from a unilateral impaction of the M<jats:sup>2<\/jats:sup>as a result of the ectopic position of the developing M<jats:sup>3<\/jats:sup>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>We conclude that the most likely etiology for the ectopic position of the M<jats:sup>3<\/jats:sup>is the lack of space in the maxilla. We discuss possible contributing factors, such as morphometric aspects of the maxilla and the early mineralization of the M<jats:sup>3<\/jats:sup>, to support the M<jats:sup>2<\/jats:sup>impaction. Finally, due to the early age at death of this individual we did not identify any secondary lesion associated with the M<jats:sup>2<\/jats:sup>impaction.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajpa.24010","type":"journal-article","created":{"date-parts":[[2020,1,14]],"date-time":"2020-01-14T14:38:12Z","timestamp":1579012692000},"page":"733-741","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Ectopic maxillary third molar in Early Pleistocene<scp><i>Homo antecessor<\/i><\/scp>from Atapuerca\u2010Gran Dolina site (Burgos, Spain)"],"prefix":"10.1002","volume":"171","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5853-5014","authenticated-orcid":false,"given":"Laura","family":"Mart\u00edn\u2010Franc\u00e9s","sequence":"first","affiliation":[{"name":"Univ. 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