Variable impact by ambient temperature on fatigue resistance of heat-treated nickel titanium instruments

Arias, Ana; Hejlawy, Samer; Murphy, Sarah; Macorra, José C. de la; Govindjee, Sanjay; Peters, Ove A.

doi:10.1007/s00784-018-2543-6

Cited by 31 publications

(34 citation statements)

References 24 publications

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“…Therefore, the martensitic transformation temperatures do not explain the differences in CF between the 3 files tested. At the same time, the DSC for the instrument manufactured with Fire‐Wire alloy in the present study correlates with the findings of a previous paper in which transformation phases of EdgeSequel Sapphire were reported (). Hence, the DSC assessment of martensitic conversion temperatures in the previous study helped to predict the behaviour of nickel‐titanium rotaries in different environments; however, in comparison, the results of the present study seem to discard that the fatigue behaviour of instrument used in reciprocation motion could be anticipated by martensitic transformation temperatures as much as in instruments used in continuous rotation ().…”

Section: Discussionsupporting

confidence: 91%

“…A recent clinical study showed room temperature sodium hypochlorite placed in root canals rapidly approaches body temperature (); therefore, instruments are expected to work at body temperature during clinical use. Moreover, recent studies have clearly demonstrated that there is a decrease in CF with increased temperature, moreover in martensitic instruments (). Two different studies have tested ProTaper Universal F2 at room and body temperature and found a similar reduction in CF ().…”

Section: Discussionmentioning

confidence: 99%

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Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

et al. 2019

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The purpose of this study was to compare cyclic fatigue (CF) resistance of reciprocating instruments at body temperature and relate the findings to their martensitic transformation temperatures. Contemporary nickel-titanium (NiTi) reciprocating instruments WaveOne Primary, WaveOne Gold Primary and EdgeFile X1 (n = 20 each and #25 tip diameter) were tested for CF resistance at body temperature (37 AE 1°C). Instruments were actioned according to manufacturer guidelines until fracture occurred in a simulated canal (angle of curvature = 60°, radius of curvature = 3 mm and centre of curvature = 5 mm from the tip). Time to fracture was recorded, and data analysed using Weibull analysis. Two instruments of each were tested using differential scanning calorimetry (DSC) to assess phase transformation temperatures. Reciprocating instruments manufactured with new alloys seem to be safer to CF than those manufactured with traditional M-Wire at body temperature. Martensitic transformation temperatures seem not to relate with fatigue behaviour for reciprocating motions.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

et al. 2019

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“…Similar results were reported by Alfawaz et al (). Increase in surrounding temperature from laboratory to body temperature resulting in lower NCF was also reported for ProTaper Universal (Plotino et al ); Reciproc Blue (VDW) (Plotino et al ); Vortex Blue (Dosanjh et al , Arias et al ); Edge File (Edge Endo, Albuquerque, NM, USA) (Dosanjh et al ); Edge Sequel Sapphire (Edge Endo) (Arias et al ); TRUShape (Dentsply Sirona) (Arias et al ); EndoSequence (Brasseler USA, Savannah, GA, USA) (Dosanjh et al , Shen et al ); ProFile (Shen et al ); and K3 (Sybron Endo, Orange, CA, USA)(Shen et al ). On the contrary, no such effects could be proven for HyFlex EDM (Coltène/Whaledent) (Arias et al ) and ProTaper Gold (Plotino et al ).…”

Section: Variables In Study Designsmentioning

confidence: 69%

A critical appraisal of studies on cyclic fatigue resistance of engine‐driven endodontic instruments

Hülsmann

Donnermeyer

Schäfer³

2019

Int Endodontic J

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The endodontic literature contains a plethora of studies on static and dynamic cyclic fatigue resistance tests performed on a large array of rotary or reciprocating nickel–titanium endodontic instruments. It was the aim of this review to summarize the currently available evidence to point out the different outcomes from static versus dynamic tests and to assess whether cyclic fatigue tests provide useful data and information for clinical practice. An electronic literature research in the database PubMed was performed using appropriate search terms, and the titles and abstract were screened for relevance. Language was restricted to English. The review reveals marked differences between the results obtained in static and dynamic tests, and also, the results for the same instruments assessed either under static or dynamic experimental conditions are widely inconsistent. Between the lowest and the highest value for one and the same pathfinding instrument was a factor of about 123 when cyclic fatigue was assessed either under static or dynamic experimental conditions. Moreover, standard deviations of up to 30% have been reported. Environmental temperature has a 500% impact on the lifetime of instruments. In conclusion, fatigue resistance tests conducted under room temperature should be regarded as having little meaning and the scientific and clinical benefits of fatigue resistance tests are very limited. These data should be provided by the manufacturer of the instruments.

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“…Although the vast majority of studies on S-shaped root canals have been conducted at room temperature, some studies showed that different ambient temperatures influenced the fracture resistance of heat-treated NiTi instruments. 18 , 24 - 27 Cyclic fatigue testing of the files was carried out at body temperature in this study to simulate clinical conditions similar to that in a study by Huang et al 18 However, the frequent replacement of the irrigants used during the preparation and the contact of the NiTi files with the irrigants in the root canals might cause the canal temperature to vary depending on the temperature of the solution used. This is important when the ambient temperature to which NiTi files are exposed is considered as a factor in cyclic fatigue studies.…”

Section: Discussionmentioning

confidence: 99%

Cyclic fatigue resistance of reduced-taper nickel-titanium (NiTi)instruments in doubled-curved (S-shaped) canals at body temperature

Uslu

Gündoğar

Özyürek

et al. 2020

J Dent Res Dent Clin Dent Prospects

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Background. This study was conducted to compare the cyclic fatigue resistance of VDW.ROTATE,TruNatomy Prime, HyFlex CM, and 2Shape nickel-titanium (NiTi) rotary instruments in doublecurvedcanals in a simulated clinical environment. Methods. Eighty NiTi files were used for the fatigue testing in stainless steel canals compatible withinstrument sizes until fracture occurred (n=20): VDW.ROTATE (04./25#), TruNatomy Prime (04./26#),HyFlex CM (04./25#) and 2Shape TS04./25#( 1). For each instrument, the number of cycles to fracture(NCF) was calculated, and the fractured fragment length (FL) was measured. To verify that the fileswere fractured due to cyclic fatigue, the fractured surfaces of the files were evaluated under a scanningelectron microscope. Data were statistically analyzed using the Kruskal–Wallis and Student’s t-tests atthe %95 confidence level. Results. The failure of the files due to cyclic fatigue was first seen in the apical curvature before thecoronal curvature (P<0.05). The highest fatigue resistance was observed in VDW.ROTATE and HyFlexCM files in both curvatures (P<0.05). There were no significant differences in the fatigue resistancebetween the HyFlex CM and VDW.ROTATE files or between the 2Shape and the TruNatomy files(P>0.05). There was no difference in the fractured lengths of the files between the apical and coronalcurvatures (P>0.05). Conclusion. In artificial S-shaped root canals, VDW.ROTATE and HyFlex CM files exhibited higherfatigue resistance compared to 2Shape and TruNatomy files.

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Variable impact by ambient temperature on fatigue resistance of heat-treated nickel titanium instruments

Abstract: Rotary instruments manufactured with different post-machining heat treatment responded differently to changed ambient temperatures. DSC assessment of martensitic conversion temperatures helps to predict the behavior of nickel titanium rotaries in different environments.

Cited by 31 publications

References 24 publications

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

Resistance to cyclic fatigue of reciprocating instruments determined at body temperature and phase transformation analysis

A critical appraisal of studies on cyclic fatigue resistance of engine‐driven endodontic instruments

Cyclic fatigue resistance of reduced-taper nickel-titanium (NiTi)instruments in doubled-curved (S-shaped) canals at body temperature

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