Working Length Transfer in the Endodontic Clinical Practice: A Comparative Study

Alovisi, Mario; Dioguardi, Mario; Carossa, Massimo; Troiano, Giuseppe; Domini, Maria Chiara; Paolino, Davide Salvatore; Chiandussi, Giorgio; Berutti, Elio

doi:10.3390/app10175824

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…Changes in canal curvature (angle and radius) after the use of the two different NiTi single file systems were statistically significant. This agrees with the findings of previous studies which found that both motions (continuous rotation, reciprocating motion) make a significant difference in the original shape of the curved root canal [ 22 , 25 ]. The reason for these changes may be the high range of curvature of the selected root canals, which are often narrow canals, and the large taper sizes of both single file Reciproc blue and One Curve.…”

Section: Discussionsupporting

confidence: 93%

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Shaping Ability of Reciproc Blue Versus One Curve in Curved Canal: An In-Vitro Study

Altufayli¹,

Salim²,

Katbeh³

et al. 2022

Cureus

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The introduction of nickel-titanium (NiTi) rotary instruments improved the root canal preparation of the narrow and curved root canals, especially after the introduction of thermomechanical treated (NiTi) alloys that have a high flexibility to prepare the curved canal reducing the common clinical complication, such as fracture, the change of the original shape of the root canal as a result of the change in the curvature of the curved root canal, the change of the working length which caused by the creation of the ledges, canal transporting and zipping especially in medium and highly curved canal. This study aimed to compare the shaping ability of two heat-treated nickel-titanium single file systems using reciprocation motion and rotary motion in curved canals. Materials and methods Thirty extracted human teeth with one curved root at 25 to 56 degrees were used, two NiTi single file systems were used to prepare the curved root canal in two groups: Reciproc R25 (Munich, Germany: VDW) group (n=15) and One Curve (Besancon, France: Micro-Mega) group (n=15). Curved root canal instrumentation outcomes were evaluated using cone-beam computed tomography (CBCT). Kruskal-Wallis with Bonferroni post hoc test was used to assess differences between working length, the angle and radius of curvature after instrumentation. Results There was a significant difference in angle and radius of curvature (-1.83° One Curve, -2.25° Reciproc blue and -0.18 mm One Curve, -0.19 mm Reciproc blue, respectively) (p<0.05) after instrumentation for both One Curve and Reciproc blue groups, and there was no significant difference in working length change (-0.16 mm One Curve, -0.32 mm Reciproc blue) after instrumentation of both One Curve and Reciproc blue groups (p>0.05). Conclusion The Reciproc blue single file system with reciprocation movement and One Curve with continuous movement cause a significant difference in curvature and radius of curved root canal affecting the original shape of the root canal with no significant difference in working length of the curved root canal.

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Section: Discussionsupporting

confidence: 93%

“…It has been suggested that evaluation of the changes on canal shape elements such as curvature and working length after instrumentation is a reliable process to assess the ability of rotary system to preserve the original shape of curved root canal [ 22 ].…”

Section: Discussionmentioning

confidence: 99%

Shaping Ability of Reciproc Blue Versus One Curve in Curved Canal: An In-Vitro Study

Altufayli¹,

Salim²,

Katbeh³

et al. 2022

Cureus

View full text Add to dashboard Cite

show abstract

“…Numerous studies have approached various aspects regarding the behavior of endodontic instruments, including the influence of lubricants on torsional loads [27], metallurgical features [28], comparison between manual instruments and NiTi files [29], influence of heat sterilization procedures [30] or of surface design [31]. During root canal preparation, endodontic instruments are exposed to torsional and flexural stresses, the former for straight root canals and the latter for curved ones [32].…”

Section: Discussionmentioning

confidence: 99%

Experimental Study of the Effects of Torsional Loading on Three Types of Nickel-Titanium Endodontic Instruments

et al. 2021

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In modern endodontics, nickel-titanium (NiTi) rotary instruments are used on a large scale for root canal shaping. Nevertheless, the separation of an instrument is a serious concern during shaping. The aim of this study is to determine and compare the torsional fracture characteristics of three types of NiTi endodontic instruments, each with different cross-section designs and movements performed during root canal shaping: Endostar E3 (Endostar, Poldent Co. Ltd., Warsaw, Poland); Reciproc R25 (VDW, Munich, Germany); and Protaper Next X2 (Dentsply Maillefer, Ballaigues, Switzerland). Fifteen instruments are used in this study, divided in three groups (n = 5): Group Endostar, Group Reciproc and Group Protaper. For testing, each instrument is used to shape five simulated root canals, following which its torsional stress to failure is measured. The fracture lengths of all three groups are roughly between 2 and 3 mm from the tip. Higher values of the moment of torsion in fracture, and smaller values of the maximum twisting angle are observed for Group Endostar, as well as closer to circular cross-sections. However, the values of the shear tension are similar for all three groups, because the disadvantage given by the fracture section shape for Groups Reciproc and Protaper is compensated either by size or by intrinsic properties of the instrument material. For the shear tension the Endostar values are insignificantly increased (Kruskal–Wallis test, p = 0.207), and in the case of the maximum twist angle the Protaper values are insignificantly increased (Kruskal–Wallis test, p = 0.287). Because of the instruments shape and conicity, the analysis had to be carried out separately with regard to the length of the fractured tip. Rules-of-thumb are extracted from the study for current practice: if a blockage of the first 2 to 3 mm part of the tip can be anticipated (by the excessive curving of the instrument), the handpiece must be adjusted to torque values that do not exceed 1.5 to 2.5 N · cm for Endostar and 1 to 2 N · cm for Reciproc and Protaper instruments.

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Working Length Transfer in the Endodontic Clinical Practice: A Comparative Study

Cited by 2 publications

References 35 publications

Shaping Ability of Reciproc Blue Versus One Curve in Curved Canal: An In-Vitro Study

Shaping Ability of Reciproc Blue Versus One Curve in Curved Canal: An In-Vitro Study

Experimental Study of the Effects of Torsional Loading on Three Types of Nickel-Titanium Endodontic Instruments

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