{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T16:51:26Z","timestamp":1791823886467,"version":"4.3.4"},"reference-count":36,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2021,1,10]],"date-time":"2021-01-10T00:00:00Z","timestamp":1610236800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100005856","name":"Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa","doi-asserted-by":"publisher","award":["UIDB\/50025\/2020\u20102023"],"award-info":[{"award-number":["UIDB\/50025\/2020\u20102023"]}],"id":[{"id":"10.13039\/501100005856","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Int Endodontic J"],"published-print":{"date-parts":[[2021,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To compare the ProTaper Next (PTN) system with a replica\u2010like and a counterfeit system regarding design, metallurgy, mechanical performance and shaping ability.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methodology<\/jats:title><jats:p>Replica\u2010like (X\u2010File) and counterfeit (PTN\u2010CF) instruments were compared to the PTN system regarding design (microscopy), phase transformation temperatures (differential scanning calorimetry), nickel\u2010titanium ratio (energy\u2010dispersive X\u2010ray spectroscopy), cyclic fatigue, torsional resistance, bending strength, and untouched canal areas in extracted mandibular molars (micro\u2010CT). <jats:sc>anova,<\/jats:sc> <jats:italic>post hoc<\/jats:italic> Tukey\u2019s and Kruskal\u2013Wallis tests were used according to normality assessment (Shapiro\u2013Wilk test) with the significance level set at 5%.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overall similarities in design and nickel\u2010titanium (Ni\/Ti) ratio were observed amongst instruments with the X\u2010File having a smoother surface finish. PTN and PTN\u2010CF had mixed austenite plus R\u2010phase (R\u2010phase start approximately at 45\u00a0\u00baC and near 30\u00a0\u00baC, respectively), whilst X\u2010File instruments were austenitic (R\u2010phase started at approximately at 17\u00a0\u00baC) at room temperature (20\u00a0\u00baC). PTN\u2010CF had the greatest inconsistency in the phase transformation temperatures. Time to fracture of PTN\u2010CF X2 and X3 was significantly shorter than PTN and X\u2010File instruments (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.05), whilst no difference was noted in maximum torque to fracture amongst the tested systems (<jats:italic>P<\/jats:italic>\u00a0&gt;\u00a00.05). X\u2010Files and PTN\u2010CF had a stress\u2010induced phase change during bending load. Mean unprepared surface areas of root canals were 25.8% (PTN), 31.1% (X\u2010File) and 32.5% (PTN\u2010CF) with no significant difference amongst groups (<jats:italic>P<\/jats:italic>\u00a0&gt;\u00a00.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>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\u2010cyclic fatigue resistance. Apart from these differences, the unprepared canal surface areas, obtained with the tested systems, were similar.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.13463","type":"journal-article","created":{"date-parts":[[2020,12,10]],"date-time":"2020-12-10T22:18:43Z","timestamp":1607638723000},"page":"780-792","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Comparison of design, metallurgy, mechanical performance and shaping ability of replica\u2010like and counterfeit instruments of the ProTaper Next system"],"prefix":"10.1111","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6932-2038","authenticated-orcid":false,"given":"J. N. 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