Apical stress distribution under vertical compaction of gutta‐percha and occlusal loads in canals with varying apical sizes: a three‐dimensional finite element analysis

Yuan, Kai; Niu, Chenguang; Xie, Qian; Jiang, Wenxin; Gao, Li; Ma, Rui; Huang, Zhengwei

doi:10.1111/iej.12825

Cited by 11 publications

(9 citation statements)

References 35 publications

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“…A recent study showed that under vertical and lateral occlusal loads, greater apical enlargement resulted in increased stress on the remaining dentinal walls, especially at the apex. It also suggested that these areas would therefore be at an increased risk for crack formation during obturation (26). Overly aggressive canal preparation, such that the apical constriction is lost, may allow extrusion of irrigant solutions beyond the apex, which may cause breakthrough pain, mucosal and bone necrosis, sensory and motor defects, and may require hospitalization (27).…”

Section: Discussionmentioning

confidence: 99%

Influence of apical preparation size on effective conventional irrigation in the apical third: a scanning electron microscopic study

2018

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This study aimed to investigate the relationship between final apical preparation size and smear layer removal in the apical third using conventional irrigation in mandibular bicuspids. Methods: A total of 66 extracted human mandibular bicuspids with comparable root canal morphology were equally divided into five experimental groups and a control group (n=11). Based on their experimental group, samples were instrumented up to size 25, 30, 35, 40, or 45 with 0.04 taper using 2.5% sodium hypochlorite (NaOCl) as the irrigant. Final irrigation was performed with 17% EDTA followed by 2.5% NaOCl. The control group was instrumented up to size 45/.04, and was irrigated with distilled water. Samples were sectioned buccolingually, and they were qualitatively evaluated under scanning electron microscope for efficacy in smear layer removal. The Kruskal-Wallis and Mann-Whitney U tests were employed for statistical analysis. Results: Statistical analysis revealed comparable removal of smear layer in the coronal and middle thirds of all experimental samples regardless of grouping. When using file size larger than 35, removal of smear layer in the apical third significantly improved (p<0.05). No significant difference was observed between 40/.04 and 45/.04. Conclusion: Under the conditions of this study, using conventional irrigation, apical enlargement more than size 35/.04 is essential to enhance removal of smear layer at the apical third.

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Section: Discussionmentioning

confidence: 99%

Influence of apical preparation size on effective conventional irrigation in the apical third: a scanning electron microscopic study

2018

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“…Different simulated material properties (Young’s modulus (E) and Poisson’s ratio values) were generated, based on data from the literature (Table 2). 15,17,19 Cross-sections of root canal were created from the apex at intervals of 1.0 mm. To visualize the stress distributions and magnitudes in the models, the data were transformed into color graphics.…”

Section: Methodsmentioning

confidence: 99%

“…Two-direction (vertical and lateral) loading patterns were simulated with a 175-N force and applied to two 1-mm 2 areas. 17,18 The lateral load was applied to the lingual plane of the cusp at a 45° angle to the longitudinal axis of the mandibular premolar. Each part of the whole model was imported into the Abaqus software (Abaqus, V6.14, Dassault Simulia, Johnston, RI, USA) to perform static linear analysis.…”

Section: Methodsmentioning

confidence: 99%

Stress distribution in a mandibular premolar after separated nickel-titanium instrument removal and root canal preparation: a three-dimensional finite element analysis

Wang

et al. 2019

J Int Med Res

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Objective This study used finite element analysis (FEA) to assess the von Mises stresses of a mandibular first premolar after removing a separated instrument with an ultrasonic technique. Methods FEA models of the original and treated mandibular first premolar were reconstructed, and three models (the original canal, size 30/taper 0.04 canal, and separated instrument removal canal) were created. Two-direction (vertical and lateral) loading patterns were simulated with a 175-N force. The maximum von Mises stresses of the models within the roots from the apex to the cervical region were collected and summarized. Results Under vertical and lateral loads, all maximal values in the three models were localized in the straight-line access region. Compared with the original model (model 1), the treated models (models 2 and 3) had greater maximum stress values from the apex to the cervical region. Greater differences in the maximum von Mises stresses between models 2 and 3 were present in the straight-line access region. Conclusions Separated instrument removal caused changes in stress distribution and increases in stress concentration in the straight-line access region of roots.

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“…21 Specifically in endodontics, this kind of analysis or finite element analysis (FEA) in general has been directed toward evaluation of fluid pattern during irrigation, physical parameters of dental instruments, tooth strength, etc. [22][23][24][25][26] One of the main advantages of CFD is the possibility of evaluating the entire irrigation process, without limiting to obtain a static image as it happens with microscopic or microbiological studies. 5,19 Furthermore, it also provides information about pressure and velocity distribution, which is difficult to obtain with in vitro and in vivo models.…”

Section: Introductionmentioning

confidence: 99%

“…CFD has already been used before to evaluate both circulatory and respiratory systems among others 21 . Specifically in endodontics, this kind of analysis or finite element analysis (FEA) in general has been directed toward evaluation of fluid pattern during irrigation, physical parameters of dental instruments, tooth strength, etc 22‐26 . One of the main advantages of CFD is the possibility of evaluating the entire irrigation process, without limiting to obtain a static image as it happens with microscopic or microbiological studies 5,19 .…”

Section: Introductionmentioning

confidence: 99%

CFD analysis on the effect of combining positive and negative pressure during the irrigation of artificial isthmuses

Loroño

Zaldı́var

Jiménez-Octavio

et al. 2020

Numer Methods Biomed Eng

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Fluid dynamics generated by irrigation needles have not been deeply analyzed in root canal irregularities such as apical ramifications or isthmus where the cleaning capacity of irrigants might be compromised and hence the treatment outcome. The goal of this study was to compare the key irrigation parameters (flow pattern, irrigant velocity, apical pressure, and shear stress) between two irrigation needles and the additional effect of aspiration cannulas through computational fluid dynamics. A 3D-model consisting of two canals linked by an isthmus was modeled. The abovementioned needles irrigated the primary canal, whereas an aspiration cannula was located inside the secondary canal. Both the geometry definition and spatial discretization were carried out with ANSYS 16.2, through which six different simulations were performed: lateral exit (LE) needle, frontal exit (FE) needle, LE and cannula in crown (LEC), FE and cannula in crown (FEC), LE and cannula in middle third (LEM), FE and

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Apical stress distribution under vertical compaction of gutta‐percha and occlusal loads in canals with varying apical sizes: a three‐dimensional finite element analysis

Abstract: Apical enlargement caused stress distribution changes in the apical region of roots. The larger apical size led to higher stress concentration at the root apex.

Cited by 11 publications

References 35 publications

Influence of apical preparation size on effective conventional irrigation in the apical third: a scanning electron microscopic study

Influence of apical preparation size on effective conventional irrigation in the apical third: a scanning electron microscopic study

Stress distribution in a mandibular premolar after separated nickel-titanium instrument removal and root canal preparation: a three-dimensional finite element analysis

CFD analysis on the effect of combining positive and negative pressure during the irrigation of artificial isthmuses

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