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Our aim was to conduct a morphometric assessment of a dentinal dysplasia type 1c (<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>1c) caries\u2010free mandibular second molar, extracted due to symptomatic apical periodontitis. Controls consisted of five intact mandibular second molars. Micro\u2010computed tomography analysis showed that the <jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>1c volume % for enamel, dentine\/cementum and pulp chamber fell in the 0.36th, 99.97th and 0.09th percentiles of the control teeth (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.01). It also revealed an extremely complicated root canal system in the <jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>1c tooth with a varying degree of dentine mineralisation and aberrant dentine deposition in the pulp chamber. A crack extending from the external tooth surface to the pulp chamber was identified as a potential site for microbial invasion. Clinical implications include preventive measures and early intervention in reversible pulpitis. Conclusion: Micro\u2010<jats:styled-content style=\"fixed-case\">CT<\/jats:styled-content> imaging can be useful in establishing post\u2010extraction diagnosis of cracks and phenomic characterisation of tooth anomalies.<\/jats:p>","DOI":"10.1111\/aej.12359","type":"journal-article","created":{"date-parts":[[2019,7,16]],"date-time":"2019-07-16T13:10:28Z","timestamp":1563282628000},"page":"298-304","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Dentinal dysplasia type 1: A 3D micro\u2010computed tomographic study of enamel, dentine and root canal morphology"],"prefix":"10.1111","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1957-0719","authenticated-orcid":false,"given":"Sarbin","family":"Ranjitkar","sequence":"first","affiliation":[{"name":"Adelaide Dental School The University of Adelaide Adelaide South Australia 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