Abstract:
AIM:To investigate the smallest dentine thickness in mesial canals of mandibular molars along the cervical and middle thirds of the root by means of a micro-computed tomographic (micro-CT) technology and digital image analysis. METHODOLOGY:Fifty mesial roots of mandibular molars having two independent canals (mesiobuccal and mesiolingual), in the coronal and middle levels, were selected and scanned in a micro-CT device. After reconstruction procedures, approximately 468 slices per root covering the 7 mm below the furcation area of the mesial root were analysed to measure the smallest dentine thickness (danger zone [DZ]) in each slice from both distal and mesial regions of the mesial canals by an automatic segmentation process. RESULTS:The DZ values in the mesiobuccal canals varied from 0.67 to 1.93 mm, with an average of 1.13 ± 0.21 mm. For the mesiolingual canals, the DZ varied from 0.77 to 1.89 mm with an average of 1.10 ± 0.21 mm. There was no correspondence in the DZ between the mesiobuccal and mesiolingual canals at the same cross-sectional level in 71% of the specimens. Moreover, the smallest dentine thickness was towards the mesial region of the roots in 22% and 18% of the mesiolingual and mesiobuccal canals, respectively. (Figs 1 and 2 CONCLUSIONS: The smallest dentine thickness was on the mesial plane of the roots in about 40% of the canals. The vertical location of the DZ in relation to the furcation area was in the middle third of the root.
journal_name
Int Endod Jjournal_title
International endodontic journalauthors
De-Deus G,Rodrigues EA,Belladonna FG,Simões-Carvalho M,Cavalcante DM,Oliveira DS,Souza EM,Giorgi KA,Versiani MA,Lopes RT,Silva EJNL,Paciornik Sdoi
10.1111/iej.13141subject
Has Abstractpub_date
2019-10-01 00:00:00pages
1501-1507issue
10eissn
0143-2885issn
1365-2591journal_volume
52pub_type
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journal_title:International endodontic journal
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