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A total of 291 fused\u2010rooted teeth collected from the Chinese population were scanned using micro\u2010computed tomography and a dental operating microscope was used for observing the PCFs. The classification of the PCF and root canal configuration were identified according to modified Min et\u00a0al.'s and Gao et\u00a0al.'s classifications, respectively. Additionally, a new radicular groove classification was proposed. The correlation among these morphological characteristics was investigated using the chi\u2010square test and Fisher's exact test (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). The results showed that 74.2% of teeth had C\u2010shaped PCFs, while 21.0% had non\u2010C\u2010shaped PCFs. As for the root canal configurations, 37.5% of teeth were merging type, 40.9% were symmetrical type, and 14.8% were asymmetrical type. Statistical analysis revealed a significant correlation between the PCF types and the root canal configurations (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). The dominant root canal types for teeth with C\u2010shaped PCFs were merging and symmetrical types, while the asymmetrical type was not identified in non\u2010C\u2010shaped PCFs. In addition, significant morphological association between the root canals and radicular grooves was also revealed (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Teeth with different PCF morphologies exhibit specific patterns of root canal category distribution. Understanding the morphological nuances of the root canal based on the PCF can assist clinicians in predicting and identifying the canal configuration beneath the visible orifice.<\/jats:p>","DOI":"10.1111\/aej.12833","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T05:30:10Z","timestamp":1708061410000},"page":"285-298","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Internal and external morphological analysis of fused\u2010rooted mandibular second molars in the Chinese population: A micro\u2010computed tomographic study"],"prefix":"10.1111","volume":"50","author":[{"given":"Weiwei","family":"Wu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Oral Diseases &amp; National Center for Stomatology &amp; National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology Sichuan University  Chengdu Sichuan China"},{"name":"Department of Stomatology, Tongji Hospital, Tongji Medical College Huazhong University of Science and Technology  Wuhan China"},{"name":"School of Stomatology, Tongji Medical College Huazhong University of Science and Technology  Wuhan China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yajun","family":"Meng","sequence":"additional","affiliation":[{"name":"Department of VIP Dental Care, Hospital of Stomatology Xi'an Jiaotong University  Xi'an Shaanxi China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chialing","family":"Tsauo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases &amp; National Center for Stomatology &amp; National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology Sichuan University  Chengdu Sichuan 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