Ticona Flores, Jesús MiguelGallardo López, Nuria EstherDiéguez Pérez, Montserrat2025-09-042025-09-042025Ticona-Flores, J. M., Gallardo-López, N. E., & Diéguez-Pérez, M. (2025). Root canal conicity of primary maxillary molars and its relationship with different rotational systems. European Archives of Paediatric Dentistry. https://doi.org/10.1007/s40368-025-01075-w1996-98051818-6300https://hdl.handle.net/11268/16101To determine the root canal taper of primary maxillary molars and the degree of compatibility of various rsotary systems concerning root anatomy. This in vitro study collected donated frst and second primary molars (1 M and 2 M) with mesiobuccal (MB), disto-buccal (DB) and palatal (P) roots canal without physiological resorption, type I according to Vertucci, and root length greater than 4 mm. The teeth were mounted in silicone blocks and scanned with tomographic equipment from which images were reconstructed and analysed with the 3D-Slicer® 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®, Protaper universal®, Mtwo® and Protaper Next®. MANOVA and interclass correlation coeffcient (ICC) tests were used for statistical analysis.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/PulpectomíaEndodonciadiente molarjournal article10.1007/s40368-025-01075-wopen accessInvestigación médicaOdontologíaTratamiento médicoGoal 3: Ensure healthy lives and promote well-being for all at all ages