Abstract
Purpose
To estimate the taper of root canals of deciduous maxillary and mandibular canines by nano computed tomography (nano-CT).
Methods
This in vitro study involved CT scan analysis of nine maxillary and five mandibular primary canines. The images of each tooth were reconstructed using OnDemand3D software. Thereon, diameter and taper analyses were performed on the free FreeCAD 0.18 software for the three-dimensional (3D) computer-aided design model. Statistical analysis was conducted using Stata v14.0 software, adopting a significance level of 5%.
Results
3D image reconstruction was performed, considering the diameters obtained along the entire length of the tooth root, and the conical model was built with a height of 10 mm. The diameters of the maxillary canine at points D0 (0 mm), D5 (5 mm), D7 (7 mm), and D10 (10 mm) were 1.62, 1.07, 0.78, and 0.49 mm, respectively, with a significant difference between the four points (p = 0.0001). Regarding maxillary canine root taper values in the cervical, middle, and apical regions, the values were 12%, 14%, and 10%, respectively. For mandibular canines, the mean diameter values obtained at points D0, D5, D7, and D10 were 1.51, 0.83, 0.64, and 0.45 mm, respectively, with significant differences among the four points (p = 0.005). The inferior canine root tapers in the cervical, middle, and apical regions were 14%, 10%, and 6%, respectively.
Conclusion
The detailed knowledge of the root morphology of maxillary and mandibular deciduous canines, as it has been shown in vitro using nano-CT, is critical to achieve accurate and efficient endodontic treatments.
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Data availability
Data associated with the manuscript are available on request.
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Acknowledgements
The authors acknowledge the support from MsC Daniel C. Cavallari and Centro para Documentação da Biodiversidade, Faculdade de Filosofia, Ciências e Letras (FFCLRP), Universidade de São Paulo, Brazil, for nano-CT scanning.
Funding
Partial financial support was received from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES)—Finance Code 001.
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GTR, MPL, RABdS and LABdS: conceptualised and designed the study, drafted the manuscript, reviewed and approved the final manuscript as submitted. GTR, MPL, PN-F and KHUK carried out the nano-CT analysis, interpreted the data, reviewed and approved the final manuscript as submitted. DJBV and LRR-S carried out the statistical analysis, interpreted and elaborated the results, drafted the manuscript, reviewed and approved the final manuscript as submitted.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Mayor National University of San Marcos, Lima, Peru (protocol CIEI 2020-006).
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Ramos, G.T., Lucisano, M.P., Victorio, D.J.B. et al. Estimation of root canal conicity of deciduous canines evaluated by nano-CT. Eur Arch Paediatr Dent 24, 335–342 (2023). https://doi.org/10.1007/s40368-023-00809-y
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DOI: https://doi.org/10.1007/s40368-023-00809-y