Topographic and Chemical Analysis of Reciprocating and Rotary Instruments Surface after Continuous Use

Bastos, Mariana Mena Barreto; Hanan, Aida Rene Assayag; Bastos, Ana Mena Barreto; Marques, André Augusto Franco; Garcia, Lucas da Fonseca Roberti; Sponchiado, Emílio Carlos

doi:10.1590/0103-6440201701528

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…However, these defects were seen in unused instruments, demonstrating that such defects were the result of the manufacturing process. These findings are corroborated by other authors, who also observed these characteristics in unused instruments [15,[21][22][23][24]26]. The difference in defects between unused instruments can be explained by their surface treatment, since One Shape NG files exhibited smooth surface or slight machining marks and the WaveOne files only features of the electropolishing procedures [27].…”

Section: Discussionsupporting

confidence: 80%

“…Although the disruption of cutting edges was present in unused WaveOne files, this defect increased from the sixth usea finding also corroborated by Pirani and coauthors [21], who also found such a disruption in this system according to the number of use. For some authors, the irregular edges found in unused WaveOne files were thought to be a defect [22,23]. However, Pirani and coauthors [21] and our study showed that these cutting edges actually resemble a wave-curl present in these instruments and therefore they should not be considered a defect.…”

Section: Discussionmentioning

confidence: 57%

“…The working time was used to assess the performance of the instruments in terms of cutting ability according to the number of uses [12]. Moreover, scanning electron microscopy was chosen for analysis of the instrument surfaces following previous essays [10,13,17,[21][22][23]. Although other authors have used stereomicroscopy [11,12], the use of scanning electron microscopy is justified because some fracture-related changes are seen at high magnifications only, which is not possible with an operation microscope [14].…”

Section: Discussionmentioning

confidence: 99%

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Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

Porto-Pires

Nabeshima

Caballero-Flores

et al. 2020

Braz. arch. biol. technol.

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The aim of this study was to assess the performance and surface alteration of two single-file systems according to the number of uses. Ten WaveOne Primary files (25/.08) and ten One Shape NG files (25/.06) were used for instrumentation of mesial root canals of mandibular molars. Each instrument was cleaned and sterilized after the preparation of two root canals and then reused. The time spent for instrumentation of each root canal was recorded and analyzed by using t-test. Microphotographs of the surface of the instruments were taken with a scanning electron microscope at different magnifications (i.e. 18x, 160x, 500x and 1000x) and at a distance of 4 mm from the instrument's tip before being analyzed by four observers. Presence of disruption of cutting edge, crack, craters and unwinding was assessed and submitted to Fisher's exact test. Both systems showed manufacturing defects and cracks. The presence of disruption of cutting edges was major in WaveOne files from the sixth use, whereas One Shape NG files showed more unwinding. Only preparation time using WaveOne files was influenced by the number of uses. One can conclude that WaveOne files had more disruption of cutting edges and took longer time for root canal preparation from the sixth use onwards, whereas the One Shape NG files showed more unwinding at the tenth use.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

Porto-Pires

Nabeshima

Caballero-Flores

et al. 2020

Braz. arch. biol. technol.

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“…Microcavities and pits (Figure 4h) after use may be associated with the loss of nickel and titanium atoms (Otsuka & Ren, 2005). Grooves (Figure 4g) were observed on the surface of the instrument after preparation, which might function as points of stress concentration, leading to premature failure (Bastos et al, 2017). Microcracks (Figure 4i) develop on the area of spiral distortion, which may have been caused by tensile and torsional overloading (Sattapan et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Effect of kinematics on the torque/force generation, surface characteristics, and shaping ability of a nickel‐titanium rotary glide path instrument: An ex vivo study

et al. 2022

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Aim:To evaluate the effect of various rotational motions on the torque/force generation, surface wear, and shaping ability of the ProGlider glide path instrument (Dentsply Sirona).Methodology: Mesiobuccal and mesiolingual canals of mandibular molars were selected based on the canal volume, length, angle of curvature (25°-40°), and radius of curvature (4-8 mm) after micro-computed tomographic scanning. The samples were randomly assigned to four groups (n = 13, each) according to movement kinematics [continuous rotation (CR; 300 rpm), optimum torque reverse motion (OTR; 180° forward and 90° reverse when torque >0.4 N cm), time-dependent reciprocal motion (TmR; 180° forward and 90° reverse), and optimal glide path motion (OGP; a combination of 90° forward, 90° reverse, 90° forward, and 120° reverse)]. Instrumentation was performed with an automated root canal instrument and torque/force analysing device. Maximum torque/force values, canal volume changes, and canal-centring ratios at 1, 3, 5, and 7 mm were evaluated. Surface defects (pits, grooves, microcracks, blunt cutting edges, and disruption of cutting edges) and spiral distortion on the ProGlider instrument were scored at the tip and 5 mm short of the tip before and after five consecutive uses with scanning electron microscopy. The Kruskal-Wallis test followed by Dunn's post-test with Bonferroni correction and Wilcoxon signedrank test were used to analyse the data (α = 0.05).Results: Optimal glide path motion generated significantly less clockwise torque and greater upward force than other groups (p < .05). OGP resulted in significantly fewer surface defects than CR (p < .05). In OGP and CR, the tip exhibited more surface defects than 5 mm short of the tip (p < .05). CR resulted in greater volume changes than OGP and TmR (p < .05) and greater centring ratios (i.e., more deviation) than OGP at 1 mm and OTR at 3 mm (p < .05).Conclusions: Under laboratory conditions using the ProGlider instrument, OGP generated significantly less clockwise torque and greater upward force than the other rotatory motions. OGP generated fewer superficial defects than CR, and the three

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“…One of the most common causes of tool damage is cyclic fatigue [ 4 , 5 , 6 , 7 , 8 ]. It has been found that the fatigue life is affected by many factors, the most important of which are the shape of the tool cross-section, type and quality of tool production, size and length of the tool, and tool movement in the root canal [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Mechanical surface treatment is among the most frequently used methods of surface treatment of NiTi alloys and includes the processes of grinding, sandblasting, and polishing [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Fatigue of Dental NiTi Instruments after Plasma Nitriding

et al. 2021

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This study investigated the possibility of nitride NiTi instruments using low-temperature plasma nitriding technology in a standard industrial device. Changes in the properties and fatigue life of used NiTi instruments before and after low-temperature nitriding application were investigated and compared. Nontreated and two series of plasma-nitrided NiTi instruments, designed by Mtwo company with tip sizes of 10/.04 taper, 15/.05 taper, and 20/.06 taper, were experimentally tested in this study. All these instruments were used and discarded from clinical use. The instruments were tested in an artificial canal made of stainless steel with an inner diameter of 1.5 mm, a 60° angle of curvature, and a radius of curvature of 3 mm. A low-temperature plasma nitriding process was used for the surface treatment of dental files using two different processes: 550 °C for 20 h, and 470 °C for 4 h. The results proved that it is possible to nitride dental instruments made of NiTi with a low-temperature plasma nitriding process. Promising results were achieved in trial testing by NiTi instruments nitrided at a higher temperature. Plasma-nitrided files were found to have, in some cases, significantly higher values than nontreated files in terms of fatigue life. The results showed that the nitriding process offers promising possibilities for suitably modified surface properties and quality of surface layer of NiTi instruments. Within the limitations of the present study, the cyclic fatigue life of plasma-nitrided NiTi dental files can be increased using this surface technology.

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Topographic and Chemical Analysis of Reciprocating and Rotary Instruments Surface after Continuous Use

Cited by 5 publications

References 25 publications

Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

Assessment of the Performance and Surface Alteration of Two Single-file Systems According to the Number of Uses

Effect of kinematics on the torque/force generation, surface characteristics, and shaping ability of a nickel‐titanium rotary glide path instrument: An ex vivo study

Cyclic Fatigue of Dental NiTi Instruments after Plasma Nitriding

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