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The European Society of Endodontology and American Association of Endodontists &amp; American Academy of Oral &amp; Maxillofacial Radiology position statements advise that Cone beam computed tomography should be considered for the assessment and\/or management of root resorption if it appears to be clinically amenable to treatment following clinical and conventional radiographic examination. The new classification takes into account the ECR lesion <jats:italic>height<\/jats:italic> (1: at CEJ level or coronal to the bone crest (supracrestal), 2: extends into the coronal third of the root and apical to the bone crest (subcrestal), 3: extends into the mid\u2010third of the root, 4: extends into the apical third of the root), <jats:italic>circumferential spread<\/jats:italic> (A: \u226490\u00b0 B: \u2264180\u00b0 C: \u2264270\u00b0 D: &gt;270\u00b0) and <jats:italic>proximity to the root canal<\/jats:italic> (d: lesion confined to dentine, p: probable pulpal involvement), thus classifying ECR in three dimensions. At present, there is no classification to accurately describe ECR. This novel and clinically relevant three\u2010dimensional classification should allow effective and accurate communication of ECR lesions between colleagues. It will also allow the effect of the nature of ECR on the outcome of treatment to be assessed objectively.<\/jats:p>","DOI":"10.1111\/iej.12824","type":"journal-article","created":{"date-parts":[[2017,7,26]],"date-time":"2017-07-26T17:06:08Z","timestamp":1501088768000},"page":"206-214","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":153,"title":["External cervical resorption: a three\u2010dimensional classification"],"prefix":"10.1111","volume":"51","author":[{"given":"S.","family":"Patel","sequence":"first","affiliation":[{"name":"Postgraduate Endodontic Unit King's College Dental Institute London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.","family":"Foschi","sequence":"additional","affiliation":[{"name":"Postgraduate Endodontic Unit King's College Dental Institute London 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