Comparative Evaluation of Cleaning Efficacy using Four Novel Nickel–titanium Rotary Instruments: An in vitro Scanning Electron Microscope Study

Kar, Prem Prakash; Khasnis, Sandhya; Kidiyoor, Krisnamurthy H

doi:10.5005/jp-journals-10024-2189

Cited by 1 publication

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“…The explanation can be found in the greater file taper. However, the file cross-section is different and rather comparable to that of Mtwo and even performed better in studies regarding cutting efficiency, although not significant [ 31 ]. In addition to the good cleaning performance, this can be seen as a positive factor in favor of low craze line formation.…”

Section: Discussionmentioning

confidence: 99%

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Longitudinal craze line propagation in human root dentin after instrumentation with NiTi rotary files of different instrument tapers after long-term chewing simulation

et al. 2021

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Objectives The aim of this study was to investigate whether file design and taper significantly influence microcrack initiation during machine preparation. Materials and methods Sixty extracted teeth with straight single canals were selected. The teeth were randomly assigned to four groups based on their root canal anatomy and the corresponding NiTi rotary file system (I, Mtwo; II, ProTaper Universal; III, F6 SkyTaper; control, no preparation and filling). The root canals of the experimental groups were filled using the single-cone technique. The tested teeth were all subjected to a mechanical chewing simulation with flat lead loading over a period of 3 years (corresponding to 150,000 cycles). The teeth were checked for dentinal defects (accumulative crack growth in length) under the digital microscope (Keyence VHX-5000) at time 0 (baseline prior to chewing simulation) and after 3, 6, 12, 24, and 36 months of loading. The cumulative crack increase was statistically analyzed using the Kruskal–Wallis test, Jonckheere–Terpstra test, and the Wilcoxon rank-sum test. The significance was set at p < 0.05. Results In contrast to preparation with greater-tapered instruments, ProTaper Universal (group II) and F6 SkyTaper (group III) instrumentation with the smaller tapered Mtwo files (group I) showed less accumulative propagation of craze lines (p < 0.05) at all time points. Conclusion Instruments with greater taper for root canal instrumentation should be used with care to avoid negative long-term effects in the form of propagation of dentinal defects over time. A positive cutting-edge angle and a smaller taper have a positive effect on a lower craze line development. Clinical relevance Instruments with a positive cutting-edge angle and a smaller taper are beneficial for the long-term preservation of dentinal tooth structure.

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Section: Discussionmentioning

confidence: 99%

“…ProTaper Universal with its triangular cross-section is a passive-cutting system, that shows less cutting efficiency and a smaller chip space for the removal of dentin chips, and consequently leads to stress in the inner root canal walls [ 29 ]. In contrast, F6 SkyTaper showed very good results in terms of cutting performance [ 31 ].…”

Section: Discussionmentioning

confidence: 99%