Defects in ProTaper S1 instruments after clinical use: longitudinal examination

Peng, Bin; Shen, Ya; Cheung, Gary S.P.; Xia, Ting

doi:10.1111/j.1365-2591.2005.00991.x

Cited by 95 publications

(96 citation statements)

References 25 publications

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“…Blunt cutting edges were also observed in this present study on all new and used files, as reported by Eggert et al (4) , who also found them on new and used instruments. After a full clean with ultrasound bath and a sterilisation technique, on all ProTaper files, dentine remnants were found on the cutting edges, they were also found trapped in fatigue cracks as described by other authors (11). Sterilization of previously used files is not 100% Foot note: (1) and (2): different SX and S1 files used.…”

Section: Discussionmentioning

confidence: 78%

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: Discussionmentioning

confidence: 78%

Microstructure alterations of rotary files after multiple simulated operative procedures

Luzi

Forner²,

Almenar³

et al. 2010

Med Oral

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“…The S1 instrument has a small and thin tip. If this tip should become engaged in a constricted lumen, the stress that builds up may quickly exceed the ultimate strength of such a small piece of material, thus leading the fracture (17).…”

Section: Discussionmentioning

confidence: 99%

Computed tomography assessment of the efficiency of different techniques for removal of root canal filling material

Dall'Agnol

Hartmann²,

Barletta

2008

Braz. Dent. J.

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This study evaluated the efficiency of different techniques for removal of filling material from root canals, using computed tomography (CT). Sixty mesial roots from extracted human mandibular molars were used. Root canals were filled and, after 6 months, the teeth were randomly assigned to 3 groups, according to the root-filling removal technique: Group A -hand instrumentation with K-type files; Group B -reciprocating instrumentation with engine-driven K-type files; and Group C rotary instrumentation with engine-driven ProTaper system. CT scans were used to assess the volume of filling material inside the root canals before and after the removal procedure. In both moments, the area of filling material was outlined by an experienced radiologist and the volume of filling material was automatically calculated by the CT software program. Based on the volume of initial and residual filling material of each specimen, the percentage of filling material removed from the root canals by the different techniques was calculated. Data were analyzed statistically by ANOVA and chi-square test for linear trend (=0.05). No statistically significant difference (p=0.36) was found among the groups regarding the percent means of removed filling material. The analysis of the association between the percentage of filling material removal (high or low) and the proposed techniques by chi-square test showed statistically significant difference (p=0.015), as most cases in group B (reciprocating technique) presented less than 50% of filling material removed (low percent removal). In conclusion, none of the techniques evaluated in this study was effective in providing complete removal of filling material from the root canals.

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“…The development of visible alterations in flute pitch and helical angle during instrumentation procedures is beneficial in alerting practitioners to discard files before fracture (110). The ProFile Vortex file appears less likely to produce such deformations, and separation might occur without warning.…”

Section: Clinical Applicationsmentioning

confidence: 99%

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

449

438

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Introduction: The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and more efficient instruments. Methods: The mechanical performance of NiTi alloys is sensitive to their microstructure and associated thermomechanical treatment history. Heat treatment or thermal processing is one of the most fundamental approaches toward adjusting the transition temperature in NiTi alloy, which affects the fatigue resistance of NiTi endodontic files. The newly developed NiTi instruments made from controlled memory wire, M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK), or R-phase wire represent the next generation of NiTi alloys with improved flexibility and fatigue resistance. The advantages of NiTi files for canal cleaning and shaping are decreased canal transportation and ledging, a reduced risk of file fracture, and faster and more efficient instrumentation. The clinician must understand the nature of different NiTi raw materials and their impact on instrument performance because many new instruments are introduced on a regular basis. Results: This review summarizes the metallurgical properties of next-generation NiTi instruments, the impact of thermomechanical treatment on instrument flexibility, and the resistance to cyclic fatigue and torsion. Conclusions: The aim of this review was to provide clinicians with the knowledge necessary for evidence-based practices, maximizing the benefits from the selection and application of NiTi rotary instruments for root canal treatment. (J Endod 2013;39:163-172)

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Defects in ProTaper S1 instruments after clinical use: longitudinal examination

Cited by 95 publications

References 25 publications

Microstructure alterations of rotary files after multiple simulated operative procedures

Microstructure alterations of rotary files after multiple simulated operative procedures

Computed tomography assessment of the efficiency of different techniques for removal of root canal filling material

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

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