Three‐dimensional modelling and concurrent measurements of root anatomy in mandibular first molar mesial roots using micro‐computed tomography

Lee, J. K.; Yoo, Yeon-Jee; Perinpanayagam, Hiran; Ha, Byung-Hyun; Lim, Sung-Bin; Oh, Soram; Gu, Yu; Chang, Seok Woo; Zhu, Qiang; Kum, Kee‐Yeon

doi:10.1111/iej.12326

Cited by 32 publications

(48 citation statements)

References 25 publications

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“…Also using a micro‐CT imaging analysis, Lee et al . () found the thinnest root canal wall on the mesial portion of the root in between 15% and 33% of the specimens, which is consistent with the present results.…”

Section: Discussionsupporting

confidence: 93%

“…Lee et al . () appears to be the only micro‐CT study that used high‐resolution and smaller slice intervals (0.1 mm). Therefore, a comprehensive anatomical study of danger and safety zones in mesial roots of mandibular molars is timely and may help reduce either the risk of midroot perforations towards the furcation area or an unnecessary loss of sound dentine tissue, which appears to contribute to the long‐term survival of teeth (Soares et al .…”

Section: Introductionmentioning

confidence: 99%

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Anatomical danger zone reconsidered: a micro‐CT study on dentine thickness in mandibular molars

et al. 2019

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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.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Anatomical danger zone reconsidered: a micro‐CT study on dentine thickness in mandibular molars

et al. 2019

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“…This results are consistent with those obtained in this study. Due to the great anatomical variations, in both mesial and distal roots, and a high frequency of accessory canals, we are also (5) of the opinion that endodontic instruments and treatment techniques should be carefully selected in order to avoid mishaps; thus, compromising success during endodontic treatment (5). With the morphology knowledge reported in this and other micro-computer tomography investigations (5,7,11,13,(16)(17)(18)(23)(24)(25), the importance of appropriate root canal preparation systems and irrigating solution selection becomes evident when considering the three dimensionality of the root canal system.…”

Section: Discussionmentioning

confidence: 99%

“…Shaping, cleaning and filling of the root canal system can result in positive outcome only with a thorough understanding of the three-dimensional complexity of the root canal system (3,4,5). The morphology of the root canal system of mandibular first molars, known as the most frequently treated tooth (6, 7), has been described and discussed controversially in literature (8).…”

Section: Introductionmentioning

confidence: 99%

Root Canal Morphology and Configuration of 118 Mandibular First Molars by Means of Micro–Computed Tomography: An Ex Vivo Study

Wolf

Paqué

Zeller

et al. 2016

Journal of Endodontics

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INTRODUCTION The aim of this study was to investigate the root canal system morphology of the mandibular first molar by means of micro-computed tomography. METHODS The root canal configuration, foramina, and accessory canals frequency of 118 mandibular first molars were investigated by means of micro-computed tomography and 3-dimensional software imaging. A 4-digit system describes the root canal configuration from the coronal to apical thirds and the main foramina number. RESULTS The most frequent root canal configurations in mesial root were 2-2-2/2 (31.4%), 2-2-1/1 (15.3%), and 2-2-2/3 (11.9%); another 24 different root canal configurations were observed in this root. A 1-1-1/1 (58.5%), 1-1-1/2 (10.2%), and 16 other root canal configurations were observed in the distal root. The mesiobuccal root canal showed 1-4 foramina in 24.6%, and the mesiolingual showed 1-3 foramina in 28.0%. One connecting canal between the mesial root canals was observed in 30.5% and 2 in 3.4%. The distolingual root canal showed 1-4 foramina in 23.7%, whereas a foramen in the distobuccal root canal was rarely detected (3.4%). The mesiobuccal, mesiolingual, and distolingual root canals showed at least 1 accessory canal (14.3, 10.2, and 4.2%, respectively), but the distobuccal had none. CONCLUSIONS The root canal configuration of mandibular first molars varies strongly. According to our expectations, both the mesial and distal roots showed a high number of morphologic diversifications. The root canal system of the mesial root showed more root canal configuration variations, connecting and accessory canals than the distal root.

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“…[65][66][67][68]). In particular, the descriptions of complex root shapes such as isthmuses or 3D curvatures as well as measurements of parameters like dentine thickness or canal width have profited from the properties presented by µCT scans [69,70]. This technique has also been successfully used to analyze teeth with multiple root canals (Fig.…”

Section: Endodontic Studies Using Micro-computed Tomographymentioning

confidence: 99%

Three-dimensional imaging of internal tooth structures: Applications in dental education

Kato

Ziegler

Utsumi

et al. 2016

Journal of Oral Biosciences

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BackgroundProviding comprehensive knowledge of the anatomy of human teeth is one of the basic functions of dental education, because a thorough understanding of their internal structure is one of the prerequisites for any successful clinical intervention. Several techniques have traditionally been employed to study and visualize the complex internal organization of human teeth. In contrast to these invasive techniques, modern imaging systems permit non-invasive analyses of the three-dimensional structure of human teeth. Owing to the relative ease of acquisition, handling, and distribution of the respective data, digital imaging techniques will also significantly influence dental education. HighlightIn this article, a broad overview of traditional and modern techniques for the visualization of internal tooth structures is provided. Emphasis is placed on micro-computed tomography systems and their application in endodontics. In addition, 3 the results derived from a comparison of histology and micro-computed tomography are presented. Apart from its utility in basic research, digital data can also be employed to create interactive three-dimensional models that are particularly suitable for teaching purposes. ConclusionNon-invasive, three-dimensional imaging techniques, in particular the various modalities of computed tomography, have ushered in a new era of endodontic studies.Owing to their digital nature, the results derived from these techniques can not only be easily analyzed and distributed but also be rapidly integrated into the teaching materials. Recent studies as well as the data shown in the present contribution suggest that digital educational materials lead to an improved understanding of the complex anatomy of human teeth.

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Three‐dimensional modelling and concurrent measurements of root anatomy in mandibular first molar mesial roots using micro‐computed tomography

Abstract: Micro-computed tomography with novel software provided valuable anatomical information for optimizing instrumentation and minimizing mishaps in nonsurgical root canal treatment.

Cited by 32 publications

References 25 publications

Anatomical danger zone reconsidered: a micro‐CT study on dentine thickness in mandibular molars

Anatomical danger zone reconsidered: a micro‐CT study on dentine thickness in mandibular molars

Root Canal Morphology and Configuration of 118 Mandibular First Molars by Means of Micro–Computed Tomography: An Ex Vivo Study

Three-dimensional imaging of internal tooth structures: Applications in dental education

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