Influence of Endodontic Treatment and Retreatment on the Fatigue Failure Load, Numbers of Cycles for Failure, and Survival Rates of Human Canine Teeth

Missau, Taiane Secretti; Bello, Mariana De Carlo; Michelon, Carina; Lang, Pauline Mastella; Pereira, Gabriel Kalil Rocha; Baldissara, Paolo; Valandro, Luiz Felipe; Bier, Carlos Alexandre Souza; Rippe, Marília Pivetta

doi:10.1016/j.joen.2017.07.013

Cited by 20 publications

(13 citation statements)

References 29 publications

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“…According to the preliminary test, subjecting the specimen to a clinical level of loads (50-150 N) for 1 million cycles was not able to induce consistent crack propagation and subsequent catastrophic fracture of teeth. Therefore, the stepwise loading methodology, which started from 100 N with 50/100-N increments every 27,000 cycles, was found to be more appropriate for this investigation 17,32 . Evaluation of the strain distribution pattern physiologically relevant loads using DMI and fatigue resistance using cyclic loading provided a better insight regarding the mechanical characteristics of the root dentin after instrumentation and microtissue engineered with cross-linked CSnps 33 .…”

Section: Discussionmentioning

confidence: 99%

“…The stepwise procedure began with a load of 100 N followed by 200, 300, 350, 400, 450, 500, 550, 600, and 650 N at a maximum of 27,000 load cycles each (30 minutes) until failure. Load at failure (N) and the numbers of sustained cycles obtained by the stepwise stress test were recorded and analyzed by Kaplan-Meier and log-rank (Mantel-Cox) tests at a significance of .05 (SPSS Statistics Version 20.0) 17 .…”

Section: Part 3: Assessment Of Fatigue Resistance Of Root Dentinmentioning

confidence: 99%

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Microtissue Engineering Root Dentin with Photodynamically Cross-linked Nanoparticles Improves Fatigue Resistance of Endodontically Treated Teeth

Nicholson

Singh

et al. 2020

Journal of Endodontics

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Introduction: Microtissue engineering root canal dentin with biopolymeric nanoparticles has the potential to improve mechanical properties of iatrogenically compromised root dentin. This study aims to characterize the surface mechanical property, bulk biomechanical response, and fatigue resistance of microtissue-engineered root dentin using photodynamically (photodynamic-activated [PDA]) cross-linked chitosan nanoparticles (CSnps). Methods: Experiments were conducted in 3 parts: part 1, root canal dentin sections were subjected to nanoindentations before/after treatment with CSnps and chemically (1-ethyl-3-[3-dimethylaminopropyl]carbodiimide [EDC] cross-linked CSnps) and photodynamically cross-linked CSnps to determine the properties of treated surfaces (n 5 84 points/group); part 2, root canal dentin specimens treated with PDA cross-linked CSnps were subjected to strain analysis using customized moir e interferometry (n 5 5/group); and part 3, root canal dentin specimens treated with EDC cross-linked CSnps, PDA cross-linked CSnps, and instrumented controls were tested using an accelerated fatigue loading protocol to evaluate the sustained loads and cycles at failure (n 5 15/group). Data were analyzed using the paired sample t test, trend analysis, and Kaplan-Meier with log-rank tests at a significance of .05 in each experiment. Results: Root dentin microtissue engineered with PDA cross-linked CSnps showed a 16.8% increase in elastic modulus and a conspicuous decrease in strain distribution in cervical root dentin (P , .01). There was a significant reduction in the tensile strain formed at the apical region of the instrumented root dentin after treatment (P , .05). Survival analysis showed a statistically significant difference (P , .05) among evaluated conditions in fatigue resistance (ie, PDA cross-linked CSnps . EDC cross-linked CSnps . control). Conclusions: This study highlighted the potential of root canal dentin microtissue engineering with PDA cross-linked CSnps to diminish radicular strain distribution and improve resistance to fatigue loads in endodontically treated teeth.

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Section: Discussionmentioning

confidence: 99%

Section: Part 3: Assessment Of Fatigue Resistance Of Root Dentinmentioning

confidence: 99%

Microtissue Engineering Root Dentin with Photodynamically Cross-linked Nanoparticles Improves Fatigue Resistance of Endodontically Treated Teeth

Nicholson

Singh

et al. 2020

Journal of Endodontics

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“…follow‐up) is more likely to be adopted to avoid a possibly unnecessary endodontic treatment, thus preserving tooth vitality and resistance (Missau et al . 2017).…”

Section: Discussionmentioning

confidence: 99%

Influence of adjacent teeth restored with metal posts in the detection of simulated internal root resorption using CBCT

et al. 2020

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AimTo assess the influence of artefacts generated by metal posts on the detection of simulated internal root resorption (IRR) in adjacent teeth using cone‐beam computed tomography (CBCT) and to verify the impact of metal artefact reduction (MAR) on these cases.MethodologyCBCT images of 14 premolar teeth were acquired before and after IRR simulation using chemical and mechanical procedures, in an OP300 Maxio unit, with and without MAR. Each tooth was placed in the socket of a human mandible and scanned under three different conditions: (i) without adjacent teeth – control group; (ii) distal adjacent tooth restored with metal post; and (iii) with both adjacent teeth restored with metal post. Five oral radiologists scored the IRR detection using a 5‐point scale. Diagnostic values were obtained for the tested groups and compared using two‐way analysis of variance (α = 0.05).ResultsThe presence of a single adjacent tooth restored with metal post did not significantly influence the diagnostic values for IRR detection (P > 0.05). The presence of both adjacent teeth with metal posts, without MAR application, was associated with a significantly lower area under the ROC curve (Az) compared to the control (P = 0.0182). In this case, the application of MAR increased Az, leading to nonsignificant differences from the control group and the group with one adjacent restored tooth (P > 0.05). Sensitivity decreased significantly when two adjacent restored teeth were present, regardless of MAR application (P = 0.0379). Specificity was not affected by the conditions tested (P > 0.05).ConclusionCBCT detection of IRR was impaired by artefacts only when both adjacent teeth restored with metal posts were present. In such cases, activation of MAR improved the performance on this diagnostic task.

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“…[ 2 ] During masticatory function, microcracks induced by different root canal preparation would eventually compromise tooth mechanical performance. [ 3 ] Higher frequency of defects in dentin exponentially increases the risk of stress concentration during mechanical loading and potentially impairs the mechanical performance of the restorative assembly. It in turn lead to catastrophic fracture under lower loads than the conventional masticatory loads.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Crack Propagation after Root Canal Preparation with Continuous and Reciprocating Files and Final Finishing with XP Endo Finisher – An In vitro Study

Ranganathan

Anoop

Raj

et al. 2021

Journal of Pharmacy and Bioallied Sciences

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Introduction: One of the disadvantages of stainless steel instruments used for root canal preparation is the lack of flexibility and shape memory. The invention of rotary instruments has been successful in overcoming these problems to a greater extent; however, some drawbacks still remain, one of which is vertical root fracture and the cause for it is microcracks formation in dentin, which in turn causes vertical root fracture. There are enough studies for microcracks using different rotary systems and this study compared microcracks with single as well as reciprocating files followed by final finishing with XP endo finisher. Apart from other studies, we used conefocal laser scanning microscope to assess microcrack propagation before and after instrumentation with each rotary system. Aim: To evaluate microcrack propagation in mandibular molars after root canal preparation with continuous and reciprocating file systems followed by final finishing with XP Endo finisher. Materials and Methods: Thirty mandibular molars indicated for the extraction due to periodontal causes were selected for this study. They were divided into three groups based on rotary systems used: Group A: ProTaper universal; Group B: ProTaper gold; and Group C: Waveone gold. All specimens were subjected to scanning before instrumentation to assess the presence of any existing cracks. Cone focal laser microscopic scanning is again repeated for each specimen after instrumentation with each rotary system and also after final finishing with XP Endo finisher. Statistical Analysis: One-way ANOVA is used. Results: Crack propagation is the highest with ProTaper universal and least with waveone gold. After final finishing of canals with XP Endo finisher, crack propagation observed was negligible. Conclusion: The success of root canal treatment depends on effective disinfection of root canal system. XP Endo finisher can be used as a final finishing file by considering its advantageous properties, moreover crack propagation with XP Endo finisher in an previously instrumented canal is negligible.

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Influence of Endodontic Treatment and Retreatment on the Fatigue Failure Load, Numbers of Cycles for Failure, and Survival Rates of Human Canine Teeth

Cited by 20 publications

References 29 publications

Microtissue Engineering Root Dentin with Photodynamically Cross-linked Nanoparticles Improves Fatigue Resistance of Endodontically Treated Teeth

Microtissue Engineering Root Dentin with Photodynamically Cross-linked Nanoparticles Improves Fatigue Resistance of Endodontically Treated Teeth

Influence of adjacent teeth restored with metal posts in the detection of simulated internal root resorption using CBCT

Evaluation of Crack Propagation after Root Canal Preparation with Continuous and Reciprocating Files and Final Finishing with XP Endo Finisher – An In vitro Study

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