Micro-computed tomography analysis of root and canal morphology in maxillary primary molars
Abstract
Effective pulpectomy of maxillary primary molars depends on a clear understanding of their complex internal root canal anatomy, yet high-resolution data on the second mesiobuccal (MB2) canal in the primary dentition remain scarce. Using micro-computed tomography (micro-CT; SkyScan 1172; 13.61 μm isotropic voxel size), the three-dimensional root and canal morphology of 60 extracted maxillary primary molars were charaterized, focusing on the prevalence, location, and morphometry of the MB2 canal, along with inter-orifice distances, canal diameters, and dentin wall thickness. Three-rooted molars predominated (83.3%). An MB2 canal was present in 43.3% of mesiobuccal roots and, when present, was consistently located palatal to the main mesiobuccal (MB1) canal, originating predominantly in the coronal third. Long-oval and oval cross-sections together accounted for almost all canals. The MB1–MB2 inter-orifice distance was the shortest of any canal pair (mean 1.12 mm), and buccolingual diameters exceeded mesiodistal diameters in the mesiobuccal, MB2, and distobuccal roots but not the palatal root. Apical dentin was thinnest in the palatal roots (0.10 mm). Maxillary primary molars therefore combine a frequently overlooked MB2 canal with thin apical walls. These findings may help clinicians plan access cavities, select instruments, and perform conservative apical preparation during pulpectomy procedures.
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BibTeX
@article{eldehna2026microcomputed,
title = {{Micro-computed tomography analysis of root and canal morphology in maxillary primary molars}},
author = {Alaa M. Eldehna and Sherief Elzahar and Ahmad H. Ahmad and Dina Yousry El Kharadly and Nada Adel Salem and Dina M. Abdel-Ghany and Nouralhouda F. Abd-Allah and Mena F. Abd-Allah and Hany Mohamed Aly Ahmed and Heba Abdelkafy},
journal = {Scientific Reports},
year = {2026},
month = oct,
doi = {10.1038/s41598-026-71739-0},
url = {https://www.nature.com/articles/s41598-026-71739-0},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Micro-computed tomography analysis of root and canal morphology in maxillary primary molars
AU - Alaa M. Eldehna
AU - Sherief Elzahar
AU - Ahmad H. Ahmad
AU - Dina Yousry El Kharadly
AU - Nada Adel Salem
AU - Dina M. Abdel-Ghany
AU - Nouralhouda F. Abd-Allah
AU - Mena F. Abd-Allah
AU - Hany Mohamed Aly Ahmed
AU - Heba Abdelkafy
PY - 2026
DA - 2026/10/23
JO - Scientific Reports
DO - 10.1038/s41598-026-71739-0
UR - https://www.nature.com/articles/s41598-026-71739-0
AB - Effective pulpectomy of maxillary primary molars depends on a clear understanding of their complex internal root canal anatomy, yet high-resolution data on the second mesiobuccal (MB2) canal in the primary dentition remain scarce. Using micro-computed tomography (micro-CT; SkyScan 1172; 13.61 μm isotropic voxel size), the three-dimensional root and canal morphology of 60 extracted maxillary primary molars were charaterized, focusing on the prevalence, location, and morphometry of the MB2 canal, along with inter-orifice distances, canal diameters, and dentin wall thickness. Three-rooted molars predominated (83.3%). An MB2 canal was present in 43.3% of mesiobuccal roots and, when present, was consistently located palatal to the main mesiobuccal (MB1) canal, originating predominantly in the coronal third. Long-oval and oval cross-sections together accounted for almost all canals. The MB1–MB2 inter-orifice distance was the shortest of any canal pair (mean 1.12 mm), and buccolingual diameters exceeded mesiodistal diameters in the mesiobuccal, MB2, and distobuccal roots but not the palatal root. Apical dentin was thinnest in the palatal roots (0.10 mm). Maxillary primary molars therefore combine a frequently overlooked MB2 canal with thin apical walls. These findings may help clinicians plan access cavities, select instruments, and perform conservative apical preparation during pulpectomy procedures.
SN - 2045-2322
ER -