Multiple Autoclave Cycles Affect the Surface of Rotary Nickel-Titanium Files: An Atomic Force Microscopy Study

Valois, Caroline R.A.; Silva, Luciano; Azevedo, Ricardo Bentes

doi:10.1016/j.joen.2008.02.028

Cited by 59 publications

(74 citation statements)

References 17 publications

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“…Sterilization with dry heat (11 cycles) is able to produce a significant increment of the superficial roughness in nickel-titanium instruments, leading to an improve of the debris retention capability (17). Other authors have shown that wet heat (with 10 cycles as in our study), produced nanostructural superficial changes in nickel-titanium endodontic files (18). In our work only two instruments experiment fracture.…”

Section: Discussionsupporting

confidence: 53%

Microstructure alterations of rotary files after multiple simulated operative procedures

Luzi

Forner²,

Almenar³

et al. 2010

Med Oral

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Aim: To assess morphological alterations of ProTaper rotary NiTi files before and after continuous use by scanning electron microscopy (SEM). Study Design: 30 root canals were chosen with an angle between 15 and 30º. Before starting to prepare the canals the files were observed microscopically using a scanning electronic microscope. The ProTaper sequence recommended by the manufacturer was used, with NaOCl as irrigant. The instruments were sterilised after every three canals were shaped. The instruments were observed with the same microscope after shaping each canal, until 30 root canals were shaped. The criteria used for checking the instruments were: blunt cutting edges, disruption of cutting edge, microfractures, fatigue cracks, metal flash, dentine remains. Results: Many microscopic defects were found such as: cutting edge breaks (up to 70%); fatigue cracks, between 33 and 100%. No microfractures were found. An S1 and an SX file were fractured. Conclusion: ProTaper instruments are quite reliable if used following usual requirements.

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Section: Discussionsupporting

confidence: 53%

Microstructure alterations of rotary files after multiple simulated operative procedures

Luzi

Forner²,

Almenar³

et al. 2010

Med Oral

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“…Some authors have used a mathematical finite element model (Kim et al, 2009;Necchi et al, 2008) or AFM (Inan et al, 2007b;Topuz et al, 2008;Valois et al, 2005Valois et al, , 2008.…”

Section: Discussionmentioning

confidence: 99%

“…AFM has been used in Endodontics to provide qualitative and quantitative information about the topography of a large variety of metal materials (Inan et al, 2007a;Topuz et al, 2008;Valois et al, 2005Valois et al, , 2008.…”

Section: Discussionmentioning

confidence: 99%

“…By this microscopy, it is possible to say that used instruments demonstrated greater deformations and wear on the surface (Inan et al, 2007b) and that multiple cycles in the autoclave increased the depth of the irregularities on the surface of NiTi rotary instruments (Valois et al, 2008). Also, the immersion of the instruments in 5.25% sodium hypochlorite caused deterioration on the surface of the instruments and should, therefore, be used with caution during clinical use due to the risk of unexpected fracture (Topuz et al, 2008).…”

Section: Introductionmentioning

confidence: 92%

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Topography of four different endodontic rotary systems, before and after being used for the 12th time

Yamazaki-Arasaki

Cabrales

Santos

et al. 2012

Microscopy Res & Technique

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Root canal preparation may damage NiTi instruments resulting in wear and deformation. The aim of this study was to make a comparative evaluation of the surface topography of the cervical third of four different rotary systems, before and after being used twelve times, in 1.440 resin blocks with simulated root canals with standardized 45° curvatures, and analyzed by atomic force microscopy AFM. The blocks were divided into four groups and prepared according to the manufacturers recommendations: Group 1--K3®; Group 2--Protaper Universal®; Group 3--Twisted Files® and Group 4--Biorace®. After each preparation, the instruments were washed and autoclaved. A total of 240 instruments were selected, being 30 new instruments and 30 after having been used for the 12th time, from each group. These instruments were analyzed by AFM and for quantitative evaluation, the mean RMS (Root mean square) values of the cervical third of the specimens from the four groups were used. The result showed that all the rotary files used for the 12th time suffered wear with change in the topography of the cervical region of the active portion of the file (ANOVA p < 0.01). Classifying the specimens in increasing order, from the least to the greatest wear suffered, Group 3 (2.8993 nm) presented the least wear, followed by Group 4 (12.2520 nm), Group 1 (36.0043 nm) and lastly, Group 2 (59.8750 nm) with the largest amount of cervical surface wear.

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“…Serene et al (12) have suggested that NiTi deformation caused during clinical use could possibly be reversed by using sterilization temperatures above 125 C. Although no effect of autoclave sterilization on Lightspeed NiTi rotary instruments (Discus Dental, Culver City, CA) has been reported; Profile NiTi rotary files have shown a higher mean cycle to failure when exposed to both dry heat and autoclave sterilization (13,14). Similar reports of autoclave conditions either improving or degrading both the performance and physical properties of various marketed rotary NiTi systems have been noted (14)(15)(16)(17)(18)(19). The purpose of this study was to investigate the effect of repeated autoclave cycles on the cyclic fatigue resistance of Twisted Files and GT Series X files.…”

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confidence: 83%

Multiple Autoclave Cycle Effects on Cyclic Fatigue of Nickel-Titanium Rotary Files Produced by New Manufacturing Methods

Hilfer

Bergeron

Mayerchak

et al. 2011

Journal of Endodontics

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Multiple Autoclave Cycles Affect the Surface of Rotary Nickel-Titanium Files: An Atomic Force Microscopy Study

Cited by 59 publications

References 17 publications

Microstructure alterations of rotary files after multiple simulated operative procedures

Microstructure alterations of rotary files after multiple simulated operative procedures

Topography of four different endodontic rotary systems, before and after being used for the 12th time

Multiple Autoclave Cycle Effects on Cyclic Fatigue of Nickel-Titanium Rotary Files Produced by New Manufacturing Methods

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