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Three‐dimensional modelling and concurrent measurements of root anatomy in mandibular first molar mesial roots using micro‐computed tomography
Author(s) -
Lee J. K.,
Yoo Y. J.,
Perinpanayagam H.,
Ha B. H.,
Lim S. M.,
Oh S. R.,
Gu Y.,
Chang S. W.,
Zhu Q.,
Kum K. Y.
Publication year - 2015
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12326
Subject(s) - molar , coronal plane , computed tomography , tomography , materials science , root canal , mandibular molar , orthodontics , mandibular second molar , anatomy , geology , medicine , radiology
Aim To obtain concurrent radicular measurements in the mesiobuccal ( MB ) and mesiolingual ( ML ) canals of mandibular first molars using scanned data of micro‐computed tomography (μ CT ) with novel software. Methodology The scanned data from 37 mandibular first molar mesial roots were reconstructed and analysed with custom‐developed software (Kappa2). For each canal, three‐dimensional (3D) surface models were re‐sliced at 0.1‐mm intervals perpendicular to the central axis. Dentine thicknesses, canal widths and 3D curvatures were measured automatically on each slice. Measurements were analysed statistically with anova for differences at each direction and at different levels of both canals. Results Lateral dentine thicknesses were significantly higher than mesial and distal thicknesses, at all the levels of both canals ( P < 0.001). Mesial thicknesses were significantly higher than distal thicknesses in the coronal third of both canals ( P < 0.001). Thinnest dentine thicknesses were mainly located on the disto‐inside of both canals. Narrowest canal widths were 0.24 ± 0.10 and 0.22 ± 0.09 mm in MB and ML canals, respectively. Canal curvatures were greatest in the apical third of both canals ( P < 0.001), and they were greater in the MB canals than in the ML canals ( P < 0.05). Conclusions Micro‐computed tomography with novel software provided valuable anatomical information for optimizing instrumentation and minimizing mishaps in nonsurgical root canal treatment.