Cyclic Fatigue of Nickel-Titanium Rotary Instruments in a Double (S-shaped) Simulated Curvature

Al-Sudani, Dina; Grande, Nicola M.; Plotino, Gianluca; Pompa, Giorgio; Carlo, Stefano Di; Testarelli, Luca; Gambarini, Gianluca

doi:10.1016/j.joen.2012.03.025

Cited by 86 publications

(104 citation statements)

References 21 publications

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“…After shaping procedures were completed all the 40 used NiTi instruments were inspected under magnification (3x) to check any sign of plastic deformation or undwinding of flutes. All the instruments were then subjected to cyclic fatigue test using a testing device that was previously described (21)(22)(23)(24)(25)(26)(27). Briefly, all instruments were tested using the TFA motion powered by Elements motor (SybronEndo, Orange, CA, USA).…”

Section: Methodsmentioning

confidence: 99%

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Gambarini

Plotino

Piasecki³

et al. 2015

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SummaryAim. To compare the effect of brushing motion on torsional and cyclic fatigue resistance of TF Adaptive instruments after clinical use. Methods. 20 packs of TFA small sequence (SybronEndo, Orange, CA, USA) were used for this study and divided into two groups. Each instrument prepared one resin tooth, consisting in 4 canals with a complex anatomy. In group A, no brushing motion was performed. In group B, after the green instrument reached the working length, brushing motion with circumferential filing was performed for 15 seconds in each canal (overall 1 minute). All the instruments were then subjected to cyclic fatigue test and mean values and standard deviation for time to fracture were evaluated. Data were subjected to one-way analysis of variance and Bonferroni t-test procedure with a significance set at P < 0.05. Results. No instruments were broken during preparation of root canals. Two TF Adaptive green and 5 yellow showed unwinding after intracanal clinical use. No statistically significant differences were found between green instruments of both groups (P > 0.05), while a statistically significant difference was found between the yellow instruments (P < 0.05), with group B showing an higher resistance to cyclic fatigue. Conclusions. A prolonged passive brushing motion did not adversely affected mechanical resistance of the instrument used for this purpose. Resistance to both deformations and cyclic fatigue of the second instrument within the TFA small sequence was enhanced by the coronal flaring provided by the brushing action of the first instrument used.

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Section: Methodsmentioning

confidence: 99%

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Gambarini

Plotino

Piasecki³

et al. 2015

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“…8,12,15,20 The artificial canal was manufactured by reproducing the instrument's size and taper and it had 5 mm radius of curvature (measured at the internal concave surface of the artificial canal), 608 angle of curvature measured according to the Schneider's method, 21 a center of curvature at 5 mm from the end of the canal and a curved segment of 5 mm in length (Fig. 1B).…”

Section: Riassuntomentioning

confidence: 99%

Effect of cyclic torsional preloading on cyclic fatigue resistance of ProTaper Next and Mtwo nickel–titanium instruments

Pedullà

Savio

Plotino

et al. 2015

Giornale Italiano di Endodonzia

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Aim: To evaluate the influence of different torsional preloads on cyclic fatigue resistance of endodontic rotary instruments made by conventional nickel-titanium (NiTi) or M-Wire. Methods: Eighty new Mtwo (#25/0.06) (Sweden & Martina, Due Carrare, Padova, Italy) and ProTaper Next X2 (Dentsply Maillefer, Ballaigues, Switzerland) were used. The Torque and distortion angles at failure of new instruments (n = 10) were measured and 0% (n = 10), 25%, 50%, and 75% (n = 20) of the mean ultimate torsional strength as preloading condition were applied according to ISO 3630-1 for each brand. The twenty files tested for every extent of preload were subjected to 25 or 50 torsional cycles (n = 10). After torsional preloading, the number of cycles to failure was evaluated in a simulated canal with 608 angle of curvature and 5 mm of radius of curvature. Data were analyzed using 2-way analysis of variance. Scanning electron microscope (SEM) was performed to evaluate the fracture surface of each fragment.Peer review under responsibility of Società Italiana di Endodonzia.

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“…Therefore, single-visit root canal treatment has become a common practice also in non-vital cases, and offers several advantages, including a decreased number of operative procedures (3), and no risk of inter-appointment leakage through temporary restorations (1). In addition, single-visit root canal therapy is less time consuming and more economical; as a consequence, innovative manufacturing processes to produce better istruments (4)(5)(6)(7), and new instrumentation techniques have been recently commercialized to improve simplicity and safety of treatment by using reciprocation motion instead of continuous rotation and by reducing the number of nickel titanium (NiTi) instruments and consequently instrumentation time (8)(9)(10). More precisely, a few years ago Dentsply Maillefer (Baillagues, Switzerland) and Dentsply VDW (Munchen, Germany) have developed two different nickel titanium instruments of greater tapers (Waveone® and Reciproc®), which are designed to be used with an innovative, proprietary reciprocating movement, and allow root canals to be prepared with one single instrument: in the majority of cases a taper.08 size 25 instrumentis selected.…”

Section: Introductionmentioning

confidence: 99%

The influence of three different instrumentation techniques on the incidence of postoperative pain after endodontic treatment

Gambarini¹

2013

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SummaryAims. Apical extrusion of infected debris to the periradicular tissues is one of the principal causes of postoperative pain and discomfort. Recent researches have shown that reciprocating instrumentation techniques seem to significantly increase the amount of debris extruded beyond the apex and, consequently, the risk of postoperative pain. The goal of the present study was to evaluate and compare postoperative pain using three different nickel-titanium instrumentation techniques: a rotary crown-down technique using TF instruments (SybronEndo, Orange, Ca), a reciprocating single-file technique using WaveOne instruments (Maillefer DEntsply, Baillagues, CH), and a novel instrumentation technique (TF Adaptive, SybronEndo, Orange, Ca), using a unique, proprietary movement, combining reciprocation and continuous rotation. Methods. Ninety patients requiring endodontic treatment on permanent premolar and molar teeth with non vital pulps preoperatively were included in the study. The patients were assigned into three groups of 30 patients each, trying to make the groups very similar, concerning the number of root canals, presence of initial pain and periapical lesions. The teeth in group 1 (n = 30) were instrumented with a crown-down technique using TF instruments, whilst those in group 2 (n = 30) were instrumented with a single-file technique using Waveone 08 25. The third group (n = 30) used the 3-file Tf Adaprtive sequence. All techniques were performed following manufacturers' instructions and all canals were shaped, cleaned and obturated in a single-visit by the same operator. The assessment of postoperative pain was carried out at 3 days by using a visual analogue scale. VAS pain scores were compared using one-way ANOVA post hoc Tukey test. A value of p < 0.05 was required for statistical significance. Results. Results for VAS pain scores showed a statistically significant difference was found between the WaveOne (p=0,021) technique and the other two techniques. No statistical significant differences were found between TF and TF Adaptive (p= 0,087). When evaluating patient experiencing sever pain the incidence of symptoms was significantly higher with the WaveOne technique. Conclusions. Since the incidence of preoperative pain, the type of tooth and the pulp and periodontal pathology were quite similar between the three tested groups, and all the other variables (operator, irrigation, obturation) were identical, we may conclude that the difference in postoperative pain can be mainly related to the different instrumentation techniques.

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Cyclic Fatigue of Nickel-Titanium Rotary Instruments in a Double (S-shaped) Simulated Curvature

Cited by 86 publications

References 21 publications

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Effect of cyclic torsional preloading on cyclic fatigue resistance of ProTaper Next and Mtwo nickel–titanium instruments

The influence of three different instrumentation techniques on the incidence of postoperative pain after endodontic treatment

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