Root groove depth and inter-orifice canal distance as anatomical predictive factors for danger zone in the mesial root of mandibular first molars

De‐Deus, Gustavo; Rodrigues, Evaldo Almeida; Lee, Jong-Ki; Kim, J.; Silva, Emmanuel João Nogueira Leal; Belladonna, Felipe Gonçalves; Cavalcante, Daniele Moreira; Simões‐Carvalho, Marco; Oliveira, Diogo da Silva; Versiani, Marco Aurélio; Souza, Erick Miranda

doi:10.1007/s00784-020-03686-7

Cited by 12 publications

(33 citation statements)

References 13 publications

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“…The use of micro‐CT technology has been widely applied in different studies that have identified potential danger zones in maxillary and mandibular molars (De‐Deus et al, 2019, 2021; Ordinola‐Zapata et al, 2019; Zhou et al, 2020). In the present study, the combination between micro‐CT methodology and digital image processing with specific software was used to analyse the root dentine thickness in mandibular first premolars.…”

Section: Discussionmentioning

confidence: 99%

“…In the present study, the combination between micro‐CT methodology and digital image processing with specific software was used to analyse the root dentine thickness in mandibular first premolars. Indeed, a radicular 3D modelling was performed and a colour map of the dentine thickness was obtained in the five root planes of the root (CEJ, CEJ‐middle, middle, middle‐apical, and apical planes) to identify thin dentine areas as potential danger zones, a technique that has been previously reported (De‐Deus et al, 2019, 2021; Ordinola‐Zapata et al, 2019). Previous studies have used the micro‐CT technology to analyse the root dentine thickness in premolars; however, arbitrarily selected linear measurements have been made, reducing the precision of the measurement and reproducibility of the findings (Fan et al, 2008; Gu, Zhang, & Liao, 2013; Gu, Zhang, Liao, & Fei, 2013; Liu et al, 2019, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…The characteristics of the danger zones and their consequent clinical implications have been extensively analysed in maxillary premolars (Liu et al, 2019, 2021) and mandibular and maxillary molars (De‐Deus et al, 2019, 2021; Ordinola‐Zapata et al, 2019; Zhou et al, 2020). However, in mandibular first premolars, the relationship between the C‐shaped canal morphology and the presence of danger zones has been scarcely studied, and the identification of thin dentine areas susceptible to perforations or wear has been only reported in studies describing biomechanical preparations (Cerqueira et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…However, in mandibular first premolars, the relationship between the C‐shaped canal morphology and the presence of danger zones has been scarcely studied, and the identification of thin dentine areas susceptible to perforations or wear has been only reported in studies describing biomechanical preparations (Cerqueira et al, 2021). In this context, the micro‐computed tomography (micro‐CT) analysis is considered the gold‐standard method for carrying out these anatomical studies due to it is a noninvasive and reproducible technique that allows the qualitative and quantitative evaluation of thin dentine areas (Amoroso‐Silva et al, 2015, De‐Deus et al, 2019, 2021; Ordinola‐Zapata et al, 2019). Besides, the use of software for digital 3D‐image analysis allows a complete mapping of dentine thickness measurements and thus, the identification of potential danger zones (De‐Deus et al, 2019, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…In this context, the micro‐computed tomography (micro‐CT) analysis is considered the gold‐standard method for carrying out these anatomical studies due to it is a noninvasive and reproducible technique that allows the qualitative and quantitative evaluation of thin dentine areas (Amoroso‐Silva et al, 2015, De‐Deus et al, 2019, 2021; Ordinola‐Zapata et al, 2019). Besides, the use of software for digital 3D‐image analysis allows a complete mapping of dentine thickness measurements and thus, the identification of potential danger zones (De‐Deus et al, 2019, 2021).…”

Section: Introductionmentioning

confidence: 99%

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A micro‐CT analysis of radicular dentine thickness in mandibular first premolars presenting C‐shaped root canals: Identification of potential danger zones

et al. 2022

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Aim To describe the radicular dentine thickness in mandibular first premolars presenting C‐shaped root canals, to identify the canal walls with less thickness as potential danger zones. In addition, to describe the internal and external anatomical characteristics of these teeth and associate them with the dentine thickness. Methodology A total of 70 mandibular first premolars presenting C‐shaped root canals were examined. Their internal morphology was analysed using Vertucci’s and Fan’s criteria, and their external morphology was analysed using the ASUDAS score. Besides, the dentine thickness around the root canals was two/three‐dimensionally determined at five root planes and quantified in the distal and the mesial aspects. Results According to Fan’s, ASUDAS, and Vertucci’s classifications, the most common canal configurations were category C3, grade 3, and type V, respectively. In Vertucci's type III anatomy, the mesial root wall of the lingual canal showed significantly less dentine thickness than the distal wall in the middle plane (p = .031). Similarly, in Vertucci's type V anatomy, significantly less dentine thickness was observed in the mesial root wall of the buccal and lingual canals in the middle plane (p < .001) and the buccal canal in the middle‐apical plane (p = .014) than the distal root wall of these canals. In teeth with ASUDAS grade 3 and 4 scores, significantly less dentine thickness was observed in the mesial in comparison with the distal root wall of these canals. These differences were demonstrated in the middle and middle‐apical planes (p < .001) of grade 3 teeth and the middle‐apical plane (p < .001) of grade 4 teeth. In these root planes, the Ver1‐AS3 and VerV‐AS3 combinations presented a 4‐times greater risk of presenting walls with a critical dentine thickness of 0.6 mm (odds ratio [OR] = 4, p = .025) than the combinations Ver1‐AS2, VerV‐AS2, VerV‐AS4, and VerIII‐AS3. Conclusions The root canal system configuration of mandibular first premolars with C‐shaped canals showed a wide range of anatomical variations. The lowest dentine thickness was located in the mesial wall of the canals in the middle and apical root thirds of Vertucci’s type III and V anatomies and in teeth with deep radicular grooves scored as ASUDAS grades 3 and 4. In the middle and middle‐apical planes, the presence of the combinations Ver1‐AS3 and VerV‐AS3 showed a high risk of presenting a critical dentine thickness of 0.6 mm. Therefore, these root canal walls with less dentine thickness represent potential instrumentation danger zones in mandibular first premolars with C‐shaped canals.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A micro‐CT analysis of radicular dentine thickness in mandibular first premolars presenting C‐shaped root canals: Identification of potential danger zones

et al. 2022

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Microcomputed tomographic evaluation of 6 NiTi files on the pericervical dentin and the smallest dentin thickness zones in mesial root canals of mandibular molars: an in vitro study

Morales,

Sánchez,

Elmsmari

et al. 2024

Clin Oral Invest

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Objectives: The aim of this study was to evaluate six les on the pericervical dentin (PCD) and the smallest dentin thickness zones (SDTZ) in mesial root canals of mandibular molars.Materials and Methods: Sixty mesial roots with 2 canals were scanned before and after instrumentation with WaveOne Gold (WG), Reciproc Blue (RB), TRUShape (TS), XP-endo Shaper (XP), iRace (IR), and TruNatomy (TN). Surface, volume, structure thickness, SMI, and centroids were evaluated at the PCD, and the changes in the SDTZ were quanti ed. The data obtained werecompared using Wilcoxon and ANOVA with a 5% signi cance level.Results: XP and TN were similar in all the parameters (P >.05) at the PCD, but TN showed signi cant differences from WG, RB, TS, and IR (P <.05), while XP showed signi cant differences from WG (P <.05) in volume, surface, and structure thickness. Regarding the changes in the SDTZ, the amount of dentin removed was similar between the groups in both canals at the middle 1/3, at the cervical 1/3 for MB canals, and in ML canals for RB, TS, XP, IR, and TN (P>.05). The action of WG was signi cantly different from that of XP and TN in the cervical 1/3 of the ML canal (P <.05).Conclusions: XP and TN maintained better the anatomy, with minor changes at the PCD and SDTZ, while WG produced the largest changes. Centering at the PCD was maintained with all the les, and their performances were safe without risk of perforation.

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Taper 0.06 Versus Taper 0.04: The Impact on the Danger Zone

De‐Deus

Rodrigues

Lee³

et al. 2023

Journal of Endodontics

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Root groove depth and inter-orifice canal distance as anatomical predictive factors for danger zone in the mesial root of mandibular first molars

Cited by 12 publications

References 13 publications

A micro‐CT analysis of radicular dentine thickness in mandibular first premolars presenting C‐shaped root canals: Identification of potential danger zones

A micro‐CT analysis of radicular dentine thickness in mandibular first premolars presenting C‐shaped root canals: Identification of potential danger zones

Microcomputed tomographic evaluation of 6 NiTi files on the pericervical dentin and the smallest dentin thickness zones in mesial root canals of mandibular molars: an in vitro study

Taper 0.06 Versus Taper 0.04: The Impact on the Danger Zone

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