Evaluation in the danger zone of mandibular molars after root canal preparation using novel CBCT software

Sousa, Vinícius Caixeta; Alencar, Ana Helena Gonçalves de; Bueno, Mike Reis; Decúrcio, Daniel de Almeida; Estrela, Cyntia Rodrigues de Araújo; Estrela, Carlos

doi:10.1590/1807-3107bor-2022.vol36.0038

Cited by 8 publications

(3 citation statements)

References 33 publications

(80 reference statements)

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“…This study findings were supported by Kumar et al (27) who concluded TruNatomy exhibited the maximum remaining dentin thickness in comparison to other rotary systems including Neohybrid and ProTaper Next. This study's results were in accordance with Sousa et al (28) Who found that root canals created with files numbered 35 (WaveOne Gold) and 40 (ProTaper Next, BioRace, and Reciproc Blue) left more residual dentin thickness in the distal aspect of the mesial roots of mandibular molars. This indicates that canal preparation in the danger zone can be done safely with these file systems.…”

Section: Discussionsupporting

confidence: 91%

Influence of heat-treated single file rotary systems on remaining dentin thickness in the danger zone of the mandibular first molar. An in-vitro CBCT study

Shaheen

2024

Egyptian Dental Journal

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Purpose: This in-vitro study was to investigate the influence of heat-treated single file rotary systems (TruNatomy, Reciproc blue, and Hyflex EDM) on remaining dentin thickness in the danger zone of mandibular first molars utilizing cone beam computed tomography (CBCT). Materials and methods:Thirty human mandibular first molars were chosen. After determining the working length and preparing the access cavity, pre-instrumentation CBCT scans were taken and recorded 4mm apical to the furcation area in the distal aspect of the mesiobuccal root canal. Instrumentation was done according to the recommended instructions of the used file. Teeth were randomly divided into three groups (n=10) based on the respective single file system, group 1: TruNatomy, group 2: Reciproc blue, and group 3: Hyflex EDM. Post-instrumentation CBCT scans were captured and recorded under the same protocol as the pre-instrumentation scans. Finally, comparisons were performed between the post and pre-instrumentation CBCT scans to calculate the remaining dentin thickness.Data of residual dentin thickness were statistically analyzed using one-way ANOVA, followed by Tukey post hoc test at a significance level of P ≤ 0.05. Results:TruNatomy removed the minimum amount of dentin in the danger zone of mandibular first molar while Reciproc blue removed the maximum amount, while no significant difference was recorded among groups (P ˃ 0.05). Conclusions:The tested heat-treated single file system had no noticeable effect on residual dentin thickness at the danger zone of the mandibular first molar.

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Section: Discussionsupporting

confidence: 91%

Influence of heat-treated single file rotary systems on remaining dentin thickness in the danger zone of the mandibular first molar. An in-vitro CBCT study

Shaheen

2024

Egyptian Dental Journal

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“…In fact, he declared what clinicians had already reported: often, the mesial canals of lower molars don't assume a central position in the root [7]. 'Danger zones' are described as areas where the dentin of the root wall is consistently thin and becomes more fragile and preferred locations for strip perforation during instrumentation [3,8]. Danger zones are commonly seen in mandibular molars [9], maxillary premolars [10], and mesiobuccal roots of maxillary first molars [3,11,12].…”

Section: Introductionmentioning

confidence: 99%

Dentin Thickness of the Danger Zone in the Mesial Roots of the Mandibular Molars: A Cone Beam Computed Tomography Analysis

Bolbolian¹,

Ramezani²,

Valadabadi³

et al. 2023

Front. Biosci. (Schol Ed)

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Background: Mandibular first molars appear to be the most commonly tooth subjected to a root canal treatment, therefore a better understanding of the anatomy critical zones for resistance of this teeth may decrease the treatment's failure rate. So, this study was conducted to evaluate the dentin thickness of the danger zone in mesial roots of mandibular first molars using cone beam computed tomography in an Iranian population. Methods: In this cross-sectional study, 210 Cone Beam Computed Tomography acquisition of the mandibular first molars were collected from a radiology center in Qazvin. The dentin thickness of the mesial roots (mesiobuccal and mesiolingual canals) was measured from the furcation to 5 mm below. The relationship between the dentin thickness in the danger zone and parameters, like age, gender, placement side, root length, the curvature of the canal, canal type, presence of middle mesial canal, and distance between the orifices of the mesial canals was investigated. Frequency, mean and standard deviation for variables were calculated, and data analysis was done by SPSS using simple and multiple linear regression and Pearson correlation coefficient. Also, two-sample t-test was used to compare mesiobuccal and mesiolingual on two sides. The significant level was also considered at (p < 0.05). Results: The average minimum thickness of danger zone dentin was found to be 0.885 ± 0.259 mm in the mesiobuccal canal and 0.906 ± 0.206 mm in the mesiolingualcanal. Also, the minimum thickness of dentin in the mesiobuccal and mesiolingual canals in the range of 0 to 1 mm from the furcation was more than in other areas. There was no significant relationship between the minimum dentin thickness of the danger zone with gender, placement side, root length, canal type, and mesial canal entrance distance. But with increasing age, the thickness of dentin in the danger zone in the mesiolingualcanal increased significantly (p = 0.008). It was also observed that with the increase in the curvature of the canal, the thickness of the dentin in the danger zone in the mesiobuccal canal decreased (moderately curved (p = 0.008), severely curved (p = 0.046)). In addition, the thickness of the dentin in the mesiobuccal and mesiolingual canal was less in the samples with the middle mesial canal (p = 0.047, 0.044). Conclusions: Less dentin thickness in the danger zone in the mesial roots of mesiolingual mandibular first molars was seen in younger patients in mesiolingual canal, with a greater degree of canal curvature in the mesiobuccal canal and teeth with a middle mesial canal. Therefore, it is suggested that large taper instruments should be used with more precision to prevent complications.

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“…Cone-beam computed tomography (CBCT) is used as a nondestructive technique for evaluation of the root canal system pre-and post-shaping procedures (6). The remaining dentin thickness in DZ have been assessed in several studies using CBCT (7)(8)(9)(10). In a previous study, in which micro-computed tomographic (µCT) imaging was used as the reference standard, it was showed that dentin thickness can be accurately measured using CBCT imaging after simulated instrument removal (11).…”

mentioning

confidence: 99%

Farklı tek eğe sistemlerinin alt çene birinci büyük azı dişlerinin tehlike alanındaki dentin kalınlığına etkisi

AKTEMUR TÜRKER,

GEDUK,

GÖZCÜ

2023

J Int Dent Sci

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Background: To compare the dentin thickness in the danger zone of mandibular molars after preparation with one rotating (XP-endo Shaper) and two reciprocating (One Reci and Reciproc Blue) single file systems using a cone beam computed tomography (CBCT). Materials and Methods: Thirty-six mesial roots of mandibular first molars having two independent canals were selected. After initial CBCT scans were provided, teeth were assigned into 3 groups related to the single file used: XP-Endo Shaper (XPS), One Reci (OR) and Reciproc Blue (RB). The roots were scanned again after preparation with respective single file systems. The minimum dentine thickness in the danger zone, at 4, 5, 6 and 7 mm below the furcation level, were measured in CBCT scans. Initial and final measurements were used to calculate the removed dentin thickness in the danger zone. Data was analyzed using Repeated-measures ANOVA (p=0.05). Results : No significant differences were found related with remaining and removed dentin thickness among single file systems at any level from the furcation (p>0.05). Conclusions: The evaluated single file systems showed similar cutting efficiency in the danger zone of mandibular molars.

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Evaluation in the danger zone of mandibular molars after root canal preparation using novel CBCT software

Abstract: Mike Reis BUENO (b) Daniel de Almeida DECURCIO (a) Cyntia Rodrigues Araújo ESTRELA (c) Carlos ESTRELA (a)

Cited by 8 publications

References 33 publications

Influence of heat-treated single file rotary systems on remaining dentin thickness in the danger zone of the mandibular first molar. An in-vitro CBCT study

Influence of heat-treated single file rotary systems on remaining dentin thickness in the danger zone of the mandibular first molar. An in-vitro CBCT study

Dentin Thickness of the Danger Zone in the Mesial Roots of the Mandibular Molars: A Cone Beam Computed Tomography Analysis

Farklı tek eğe sistemlerinin alt çene birinci büyük azı dişlerinin tehlike alanındaki dentin kalınlığına etkisi

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