Evidence for reduced torsional resistance of rotary files under curved position

Jamleh, Ahmed; Almedlej, Raghad; Alomar, Rasha K; Almayouf, Nouf; Alfadley, Abdulmohsen; Alfouzan, Khalid

doi:10.1016/j.sdentj.2020.07.005

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…Another peculiar example is related to the biomedical field , in which rotary endodontic instruments are commonly used. They have a very complex geometry and are highly subjected to torsional loads [ 58 , 59 , 60 ]. These hand-operated instruments are characterized by reduced dimensions, from hundreds of microns up to a millimeter [ 61 ], and have different cross-sectional shapes, as illustrated in Figure 2 G,H [ 62 ], according to the specific function they are designed for.…”

Section: Introduction: the Destructive Power Of Torsional Load And The Extended Interest In Itmentioning

confidence: 99%

Torsion—Resistant Structures: A Nature Addressed Solution

2021

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The complexity of torsional load, its three-dimensional nature, its combination with other stresses, and its disruptive impact make torsional failure prevention an ambitious goal. However, even if the problem has been addressed for decades, a deep and organized treatment is still lacking in the actual research landscape. For this reason, this review aims at presenting a methodical approach to address torsional issues starting from a punctual problem definition. Accidents and breaks due to torsion, which often occur in different engineering fields such as mechanical, biomedical, and civil industry are considered and critically compared. More in depth, the limitations of common-designed torsion-resistant structures (i.e., high complexity and increased weight) are highlighted, and emerge as a crucial point for a deeper nature-driven analysis of novel solutions. In this context, an accurate screening of torsion-resistant bio-inspired unit cells is presented, taking inspiration specifically from plants, that are often subjected to the torsional effect of winds. As future insights, the actual state of technology suggests an innovative transposition to the industry: these unit cells could be prominently implied to develop novel metamaterials that could be able to address the torsional issue with a multi-scale and tailored arrangement.

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Section: Introduction: the Destructive Power Of Torsional Load And The Extended Interest In Itmentioning

confidence: 99%

Torsion—Resistant Structures: A Nature Addressed Solution

2021

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Evaluation of the shaping ability of different rotary file systems in severely and abruptly curved root canals using cone beam computed tomography

Damkoengsunthon,

Wongviriya,

Tantanapornkul

et al. 2024

The Saudi Dental Journal

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Impact of cooling on shaping ability of thermally treated files in canal models with double curvature

Jamleh,

Albanyan,

Alaqla

et al. 2023

PeerJ

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Background This study compared the ability of thermally treated files in shaping simulated canals with double curvature. Fifty-six canals were enlarged to a final size of 25 with ProTaper Next (PTN) or ZenFlex (ZF). Materials Half of the samples were shaped with cooled files (n = 14 each). The amount of removed resin was measured and canal deviation was determined at eight levels. Shaping time and maximum shaping torque values were also recorded. Data were statistically analyzed using analysis of variance and LSD, Kruskal–Wallis, and chi-square tests at a 0.05 significance level. Results Compared to PTN and cooled PTN, ZF and cooled ZF required lesser time to shape the canals. The maximum torques were found comparable between the groups. All the groups generated negligible deviations at every canal level evaluated and maintained the canal geometry. Although not significant, the cooled PTN and ZF files exhibited lesser canal deviations than their counterparts. Conclusion All groups demonstrated similar shaping ability whilst maintaining the original curvature of the canal in simulated canals with double curvature. However, ZF groups were able to shape the canals faster than PTN groups. There was a trend that cooled files made lesser canal deviations compared to their counterparts.

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Evidence for reduced torsional resistance of rotary files under curved position

Cited by 3 publications

References 34 publications

Torsion—Resistant Structures: A Nature Addressed Solution

Torsion—Resistant Structures: A Nature Addressed Solution

Evaluation of the shaping ability of different rotary file systems in severely and abruptly curved root canals using cone beam computed tomography

Impact of cooling on shaping ability of thermally treated files in canal models with double curvature

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