Micro–computed Tomographic Evaluation of Dentinal Microcracks after Preparation of Curved Root Canals with ProTaper Gold, WaveOne Gold, and ProTaper Next Instruments

Miguéns-Vila, Ramón; Martín‐Biedma, Benjamín; De‐Deus, Gustavo; Peña-López, Alejandro; Castelo‐Baz, Pablo

doi:10.1016/j.joen.2020.10.014

Cited by 15 publications

(13 citation statements)

References 31 publications

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“…Despite these advantages, even in studies that have used micro-CT analysis, the percentage of microcracks created by nickel-titanium instruments in curved roots has ranged from 0% (De-Deus et al 2014, Migu ens-Vila et al 2021 to 38% (Ceyhanli et al 2016, Aksoy et al 2019, Alkahtany & Al-Madi 2020, increasing the suspicion that root canal curvature may be one of the factors related to the development of dentinal microcracks.…”

Section: Introductionmentioning

confidence: 99%

Micro‐computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments

Martins¹,

Oliveira²,

Duarte

et al. 2021

Int Endodontic J

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Section: Introductionmentioning

confidence: 99%

Micro‐computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments

Martins¹,

Oliveira²,

Duarte

et al. 2021

Int Endodontic J

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“…In recent literature, several studies have evaluated the influence of endodontic procedures on formation and propagation of dentinal defects [9,[11][12][13][14]34]. Basically, there are two different methodologies for microcrack evaluation: destructive tests are carried out by postoperative sectioning of the specimens at certain intervals.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, it is still a matter of debate, whether root canal procedures may induce the formation of dentinal microcracks assumed as precursors of vertical root fractures, which inevitably result in tooth extraction [6,7]. In recent literature, the influence of root canal preparation on the formation and propagation of dentinal defects is repeatedly and controversially discussed [8][9][10][11][12][13][14]. Furthermore, it is widely accepted that fracture susceptibility of teeth increases with extensive loss of dentin [7,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of different fiber post removal techniques and their influence on dentinal microcrack formation

et al. 2021

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Objectives The aim of this study was to evaluate the effectiveness of different fiber post removal techniques and to correlate dentinal loss with microcrack formation. Materials and methods Forty-five extracted single-rooted teeth were root canal treated and fiber posts were adhesively luted. Specimens were divided into three groups (n = 15) according to the removal technique: long-shaft round bur (EndoTracer #08, Komet, Lemgo, Germany), SonicFlex Endo (KaVo, Biberach, Germany), DT Post Removal Kit (VDW, Munich, Germany). Roots were scanned before post cementation and after post removal using micro-computed tomography. Dentin loss, residual luting material, working time, and the induction of microcracks were assessed. Statistical analysis was performed by using multiple contrast tests (max-t tests, α = 0.05). Correlations between parameters dentin loss/new microcracks and dentin loss/residual material were calculated using Kendall’s tau. Results Post removal with SonicFlex Endo resulted in the highest amount of removed dentin with significant differences to the round bur and the DT Post Removal Kit. No technique was found to completely remove the post and luting material. All techniques induced microcracks with the DT Post Removal Kit presenting the highest number of new defects. No correlation between dentin loss and new microcracks was observed. Deviations from the original root canal occurred in all groups, but no perforation was observed. Conclusions All techniques resulted in dentin loss, residual luting material, and the formation of microcracks. However, no correlation between dentin loss and the induction of microcracks was observed. Clinical relevance As all techniques resulted in microcrack formation and dentin loss, this study emphasizes the risk of iatrogenic damage due to post removal procedures.

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“…The sample size was calculated to be 10 in each group (to assess the effect of instruments on dentin), assuming the effect size of 7.6 for the microcracks reported after root canal instrumentation in previous studies, 11,12 α = 0.05, β = 0.95, and a study power of 90%, using the PASS 15 software (NCSS, Kaysville, USA).…”

Section: Sample Size Calculationmentioning

confidence: 99%

“…The roots were immediately placed back in the block. 12 Each root was randomly assigned to one of the 3 groups of 2S, EFX1 or NN (n = 10) for root canal instrumentation. All roots underwent micro-CT (LOTUS-inVivo; Behin Negareh Co., Tehran, Iran) prior to instrumentation 15 and 400-500 micro-CT transverse cross-sectional images were obtained for each root.…”

Section: Sample Selectionmentioning

confidence: 99%

Micro-computed tomography assessment of dentinal microcracks after the preparation of curved root canals with rotary and reciprocal systems

Shantiaee¹,

Zandi²,

Shojaeian³

et al. 2021

Dent. Med. Probl.

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Background. Root canal preparation with nickel-titanium (NiTi) instruments may lead to the formation of microcracks in the root canal wall. Vertical root fractures may initiate from dentinal cracks, and eventually necessitate tooth extraction.Objectives. This study aimed to assess the effect of the instrumentation of curved root canals of mandibular molars with the 2Shape (2S) sequential rotary, EdgeFile ® X1 (EFX1) reciprocating and NeoNiTi (NN) rotational single-file systems on the formation of dentinal microcracks with the use of micro-computed tomography (micro-CT). Material and methods.Thirty curved mandibular molar root canals were instrumented with the 2S, EFX1 and NN systems (10 in each group). The teeth underwent micro-CT before and after instrumentation. Next, the pre-instrumentation and post-instrumentation cross-sectional images were evaluated and compared for the detection of dentinal microcracks. The number of microcracks in each group was calculated and reported as percentage. The data was analyzed using the McNemar's test with the IBM SPSS Statistics for Windows software, v. 25.0 (α = 0.05).Results. Out of the 29,280 cross-sectional images evaluated in this study, 11.5% showed dentinal microcracks (n = 3,362). On the post-instrumentation images, the frequency percentage of microcracks was 12.0% (n = 585) in the 2S group, 8.8% (n = 402) in the EFX1 group and 13.3% (n = 694) in the NN group. All of the microcracks detected on the post-instrumentation images were also present on the preinstrumentation images and no new microcracks were formed after root canal instrumentation with the aforementioned systems.Conclusions. Root canal instrumentation with the 2S, EFX1 and NN systems did not result in the formation of new dentinal microcracks.

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Micro–computed Tomographic Evaluation of Dentinal Microcracks after Preparation of Curved Root Canals with ProTaper Gold, WaveOne Gold, and ProTaper Next Instruments

Cited by 15 publications

References 31 publications

Micro‐computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments

Micro‐computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments

Effectiveness of different fiber post removal techniques and their influence on dentinal microcrack formation

Micro-computed tomography assessment of dentinal microcracks after the preparation of curved root canals with rotary and reciprocal systems

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