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Anatomical danger zone reconsidered: a micro-CT study on dentine thickness in mandibular molars.
- Source :
-
International endodontic journal [Int Endod J] 2019 Oct; Vol. 52 (10), pp. 1501-1507. Date of Electronic Publication: 2019 Jun 09. - Publication Year :
- 2019
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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.<br />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.<br />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.<br /> (© 2019 International Endodontic Journal. Published by John Wiley & Sons Ltd.)
Details
- Language :
- English
- ISSN :
- 1365-2591
- Volume :
- 52
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- International endodontic journal
- Publication Type :
- Academic Journal
- Accession number :
- 31066080
- Full Text :
- https://doi.org/10.1111/iej.13141