Influence of Kinematics on the Cyclic Fatigue Resistance of Replicalike and Original Brand Rotary Instruments

Martins, Jorge N.R.; Silva, Emmanuel João Nogueira Leal; Marques, Duarte; Ginjeira, António; Fernandes, Francisco Manuel Braz; Deus, Gustavo De; Versiani, Marco Aurélio

doi:10.1016/j.joen.2020.05.001

Cited by 36 publications

(44 citation statements)

References 27 publications

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“…1) were tested. The replica‐like and counterfeit systems selected for this study were identified according to previously reported definitions (Rodrigues et al 2018, Martins et al 2020a).…”

Section: Methodsmentioning

confidence: 99%

“…A non‐tapered custom‐made stainless steel tube apparatus was used for the cyclic fatigue test as reported in previous studies (Silva et al 2020, Martins et al 2020a). Ten instruments of each size (X1, X2 and X3) were activated in a continuous clockwise rotation by a 6 : 1 reduction handpiece (Sirona Dental Systems GmbH, Bensheim, Germany) powered by a torque‐controlled motor (VDW Silver; VDW GmbH, Munich, Germany) at a static position using glycerine as lubricant.…”

Section: Methodsmentioning

confidence: 99%

“…In the last few years, however, the production technology of NiTi systems has become available elsewhere and small local companies have started to sell new products worldwide using e-commerce tools combined with international mail services. Consequently, two alternatives to the premium brand instruments are currently available in local or online markets: (i) replica-like systems, defined as having the same number, same colour coding and similar (or equivalent) nomenclature of the instruments (Martins et al 2020a), but marketed under a different name and/or brand, and (ii) counterfeit systems which are imitation instruments packaged in order to look like the genuine product (Rodrigues et al 2018). Counterfeit products are manufactured, packed and sold using false advertisements, violating patent rights and are susceptible to legal and criminal punishment in some countries (United Stated Code 2006).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of design, metallurgy, mechanical performance and shaping ability of replica‐like and counterfeit instruments of the ProTaper Next system

et al. 2021

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Aim To compare the ProTaper Next (PTN) system with a replica‐like and a counterfeit system regarding design, metallurgy, mechanical performance and shaping ability. Methodology Replica‐like (X‐File) and counterfeit (PTN‐CF) instruments were compared to the PTN system regarding design (microscopy), phase transformation temperatures (differential scanning calorimetry), nickel‐titanium ratio (energy‐dispersive X‐ray spectroscopy), cyclic fatigue, torsional resistance, bending strength, and untouched canal areas in extracted mandibular molars (micro‐CT). anova, post hoc Tukey’s and Kruskal–Wallis tests were used according to normality assessment (Shapiro–Wilk test) with the significance level set at 5%. Results Overall similarities in design and nickel‐titanium (Ni/Ti) ratio were observed amongst instruments with the X‐File having a smoother surface finish. PTN and PTN‐CF had mixed austenite plus R‐phase (R‐phase start approximately at 45 ºC and near 30 ºC, respectively), whilst X‐File instruments were austenitic (R‐phase started at approximately at 17 ºC) at room temperature (20 ºC). PTN‐CF had the greatest inconsistency in the phase transformation temperatures. Time to fracture of PTN‐CF X2 and X3 was significantly shorter than PTN and X‐File instruments (P < 0.05), whilst no difference was noted in maximum torque to fracture amongst the tested systems (P > 0.05). X‐Files and PTN‐CF had a stress‐induced phase change during bending load. Mean unprepared surface areas of root canals were 25.8% (PTN), 31.1% (X‐File) and 32.5% (PTN‐CF) with no significant difference amongst groups (P > 0.05). Conclusion Similarities amongst the systems were noted in the Ni/Ti ratio and maximum torque to fracture, whilst differences were observed in the design, phase transformation temperatures and mechanical behaviour. The ProTaper Next counterfeit instruments could be considered as the less secure system considering its low‐cyclic fatigue resistance. Apart from these differences, the unprepared canal surface areas, obtained with the tested systems, were similar.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of design, metallurgy, mechanical performance and shaping ability of replica‐like and counterfeit instruments of the ProTaper Next system

et al. 2021

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“…1 Manufacturers have developed several strategies to overcome these problems, such as modifying instrument design, creating new NiTi alloys and using new activation kinematics. 4,5,6,7 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

Section: Introductionmentioning

confidence: 99%

Effects of clinical use of NiTi reciprocating instruments on cyclic and torsional resistance, and on roughness

et al. 2021

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The aim of the present study was to evaluate the cyclic fatigue, torsional resistance and surface roughness of Reciproc R25 instruments in four different situations, namely as new instruments and as instruments tested after clinical preparation of one, two or three maxillary molars with four root canals. The total time required to perform each root canal preparation was recorded. Cyclic fatigue resistance was determined by the time to fracture using a customized testing device (n = 10 per group). The torsional test evaluated the torque and angle of rotation to failure according to ISO 3630-1 (n = 10 per group). The roughness of the working parts of new and used instruments was evaluated with a profilometer (n = 5 per group). Statistical analysis was performed using one-way ANOVA and Tukey's test. The level of significance was set at 5%. No fractures or deformations were observed after clinical use. Higher preparation time was needed during the third use of the instruments for all root canals (p < 0.05). There were no significant differences among the groups in regard to either cyclic fatigue or torsional resistance (p > 0.05). Regarding the roughness measurements, groove depth was higher on new and one-versus two-or three-maxillary-molar-prepared instruments (p < 0.05). It can be concluded that the clinical use of Reciproc instruments increased preparation time and decreased surface roughness. However, clinical use did not affect the cyclic fatigue or torsional resistance of the Reciproc instruments.

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“…SX, S1, S2, F1, F2). Recently, such type of instruments were named as replica-like systems ( 9 ). Jamaleh et al ( 8 ) reported that Edge Taper platinum presented greater flexibility and lower torsional resistance than ProTaper Gold.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of ProTaper Gold, EdgeTaper Platinum, Flex Gold and Pro-T rotary systems

Alcalde¹,

Duarte²,

Silva

et al. 2020

Eur Endod J

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Objective: The aim of this study was to evaluate the cyclic fatigue, torsional behavior and bending resistance of EdgeTaper Platinum [ETP (tip 25, taper 0.06)], Flex Gold [FG (tip 25, taper 0.08)], Pro-T [PT (tip 25, taper 0.08)] and ProTaper Gold [PTG (tip 25, taper 0.08)] systems. Methods: Rotary instruments of ETP, PT, FG, and PTG were used (n=30). Cyclic fatigue tests were performed using an artificial stainless-steel canal with a 60o angle and a 5-mm radius of curvature at body temperature (35°±1°C). The time and number of cycles to fracture (NCF) was recorded. The torsional test evaluated the torque and angle of rotation to failure at 3 mm from the tip according to ISO 3630-1. The fractured surface of each fragment was observed by using scanning electron microscopy (SEM). The bending test evaluated the torque required to bend the instruments at an angular deflection of 60°. Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%. Results: The ETP had highest time until fracture and NCF than all the groups (P<0.05). The PTG had the highest torsional strength, followed by FG (P<0.05). The ETP had the highest angular rotation, followed by PT and PTG (P<0.05). The FG showed the highest bending resistance, followed by the PTG (P<0.05). Conclusion: In conclusion, the ETP and PT exhibited higher cyclic fatigue resistance, higher angular deflection values and lower bending force than FG and PTG. The PTG instruments showed the highest torsional strength and the lowest cyclic fatigue resistance.

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Influence of Kinematics on the Cyclic Fatigue Resistance of Replicalike and Original Brand Rotary Instruments

Cited by 36 publications

References 27 publications

Comparison of design, metallurgy, mechanical performance and shaping ability of replica‐like and counterfeit instruments of the ProTaper Next system

Comparison of design, metallurgy, mechanical performance and shaping ability of replica‐like and counterfeit instruments of the ProTaper Next system

Effects of clinical use of NiTi reciprocating instruments on cyclic and torsional resistance, and on roughness

Mechanical properties of ProTaper Gold, EdgeTaper Platinum, Flex Gold and Pro-T rotary systems

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