Micro–computed Tomographic Analysis of Apical Microcracks before and after Root Canal Preparation by Hand, Rotary, and Reciprocating Instruments at Different Working Lengths

Oliveira, Bruna Paloma de; Câmara, Andréa Cruz; Duarte, Dayse; Heck, Richard J.; Antonino, Antônio Celso Dantas; Aguiar, Carlos

doi:10.1016/j.joen.2017.01.017

Cited by 28 publications

(47 citation statements)

References 34 publications

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“…While the first study used extracted human teeth in dry conditions, the latter maintained the specimens in their environment-pig jaws of young animals. Recently, de Oliveira et al found no defects after foramina enlargements in extracted human teeth using micro-CT analysis (de Oliveira et al 2017), corroborating the findings of Rose and Svec.…”

Section: Rotary Niti Instrumentationsupporting

confidence: 65%

“…Increased taper removes more dentin and may increase the stress on the root canal wall, increasing the risk of a root fracture (Sathorn et al 2005;Wilcox et al 1997). However, a recent micro-CT study found no increase in dentinal defects after instrumentation, even when files with various taper were used (de Oliveira et al 2017). We can once again see the conflicting results that can likely be due to the limitations of methodologies that were used.…”

Section: Rotary Niti Instrumentationmentioning

confidence: 80%

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Root-originating dentinal defects: methodological aspects and clinical relevance

2017

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It was in the 1980s when the association between root-filling procedures and dentinal microcracks was made. Nowadays, root-originating microcracks, also known as dentinal defects, are recognized as a possible precursor that is part of the longitudinal process of root-originating fractures. The presence of dentinal defects has been shown to significantly decrease the outcome through a periapical microsurgery model. Several in vitro articles have been published in the past years in regards to dentinal defects, but most of them have serious methodology concerns that will be discussed in this review. A total grasp of the development and the role dentinal defects play in endodontics is crucial to the specialty. This review aims to discuss dentinal defects and their causative factors and the research models that have been used and their clinical significance. Through a comprehensive critical review of the literature, this article will express the need for further in vivo clinical research and better ex vivo methods that can replicate the clinical setting to answer several remaining questions about the development of and the role dentinal defects play in endodontics.

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Section: Rotary Niti Instrumentationsupporting

confidence: 65%

Section: Rotary Niti Instrumentationmentioning

confidence: 80%

Root-originating dentinal defects: methodological aspects and clinical relevance

2017

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“…de Oliveira et al . () reported that root canal shaping with ProTaper Universal for Hand Use, HyFlex CM, and Reciproc systems, regardless of the working length, did not result in apical microcracks. These findings are similar to the present findings and inconsistent with the findings of Ceyhanli et al .…”

Section: Discussionmentioning

confidence: 99%

“…Micro-computed tomography (micro-CT) is a promising technology for the detection of minute structural defects such as microcracks and craze lines in roots. Recently, several studies reported the development of dentinal microcracks after root canal preparation using nickel-titanium (NiTi) instruments (Marceliano-Alves et al 2015, Ceyhanli et al 2016, de Oliveira et al 2017. In a cadaver model study, De-Deus et al (2017) confirmed that none of the preparation systems induced the formation of new dentinal microcracks when assessed using micro-CT technology.…”

Section: Introductionmentioning

confidence: 86%

Effects of ultrasonic removal of fractured files from the middle third of root canals on dentinal cracks: a micro‐computed tomography study

Huang

et al. 2018

Int Endodontic J

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“…Conversely, a recent micro‐computed tomographic study concluded that root canal instrumentation either up to the apical foramen or 1 mm short did not result in the formation of microcracks (de Oliveira et al . ).…”

Section: Discussionmentioning

confidence: 97%

Impact of apical extent of root canal filling on vertical root fracture: a case–control study

et al. 2019

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Aim To investigate the impact of apical extent of root filling on vertical root fracture (VRF) in a case–control study. Methodology Eighty‐six patients (119 roots) diagnosed with VRF in crowned root filled anterior and posterior teeth were selected. The cases were matched individually with control teeth in a ratio of 1:1 for age (±5 years), gender, tooth type, canal instrumentation method, master apical file (MAF) size and taper, technique of canal filling and time period after root filling. All root canals had been prepared using nickel–titanium (NiTi) rotary instruments and filled using the lateral compaction technique. The apical extent of root filling (overfilled to or beyond the radiographic apex or not overfilled and short of the radiographic apex) was recorded as the dependent variable by two individual examiners. Inter‐examiner agreement was obtained using Kappa statistics. Recorded numbers of overfilled and not overfilled canals in cases and controls were analysed using chi‐square tests and conditional logistic regression, and odds ratio was calculated. In addition, the frequency distribution of vertical and cross‐sectional extensions and the course of VRFs were evaluated. Results The mean age of patients with VRFs was 50 ± 10 years with 27 (31%) males and 59 (69%) females. The Kappa score for inter‐observer agreement was 0.832 (P < 0.001). There was a significant difference between cases and controls with respect to apical extent of root filling (P < 0.0001). When compared to roots not overfilled, overfilled roots had 11.5 times higher odds for occurrence of VRF (OR = 11.5; CI: 4.99 – 26.48). Most VRFs had a complete corono‐apical longitudinal extension and were present bucco‐lingually/palatally. Conclusion After matching for age, gender, tooth type, MAF size and taper, canal filling technique and time period after root filling, root canals filled to or beyond the radiographic apex following lateral compaction had a greater association with VRF than canals filled short of the radiographic apex.

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Micro–computed Tomographic Analysis of Apical Microcracks before and after Root Canal Preparation by Hand, Rotary, and Reciprocating Instruments at Different Working Lengths

Cited by 28 publications

References 34 publications

Root-originating dentinal defects: methodological aspects and clinical relevance

Root-originating dentinal defects: methodological aspects and clinical relevance

Effects of ultrasonic removal of fractured files from the middle third of root canals on dentinal cracks: a micro‐computed tomography study

Impact of apical extent of root canal filling on vertical root fracture: a case–control study

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