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The teeth were mounted in silicone blocks and scanned with tomographic equipment from which images were reconstructed and analysed with the 3D-Slicer\u00ae programme, allowing for the measurement of the diameters of the root canals and the calculation of their tapers. The tapers were compared with the characteristics of the rotary systems: Endogal\u00ae, Protaper universal\u00ae, Mtwo\u00ae and Protaper Next\u00ae. MANOVA and interclass correlation coefficient (ICC) tests were used for statistical analysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>After the analysis of 130 root canals, a mean increase in taper in the buccal-palatal (BP) direction was observed in the 2\u00a0M (MB:16.7%; DB:16.23%; P:8.86%) and the 1\u00a0M (MB: 9.75%; DB: 11.30%; P: 2.26%). In the mesiodistal (MD) direction, the 1\u00a0M exhibited an average taper of MB:6.95%, DB:4.67%, P:12.74% and in the 2\u00a0M, an average taper of 4.67% for the MB canal; 6.60%; 20.14% for DB and P canals, respectively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The rotary files that presented the best adaptation to the diameter and taper of the root canal were Endogal\u00ae and ProTaper Universal\u00ae systems.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s40368-025-01075-w","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T12:53:41Z","timestamp":1752238421000},"page":"1159-1169","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Root canal conicity of primary maxillary molars and its relationship with different rotational systems"],"prefix":"10.1007","volume":"26","author":[{"given":"Jes\u00fas Miguel","family":"Ticona-Flores","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nuria Esther","family":"Gallardo-L\u00f3pez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Montserrat","family":"Di\u00e9guez-P\u00e9rez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,7,11]]},"reference":[{"issue":"2","key":"1075_CR1","doi-asserted-by":"publisher","first-page":"195","DOI":"10.1007\/s40368-020-00530-0","volume":"22","author":"JC Barasuol","year":"2021","unstructured":"Barasuol JC, Alcalde MP, Bortoluzzi EA, Duarte MAH, Cardoso M, Bolan M, et al. 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