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After root canal preparation with instruments HyFlex EDM and Rotate 0.25 and 0.40, the specimens were evaluated for root canal volume, volume increase, static voxels, accumulated hard tissue debris, centring ability and canal transportation. After 0.40 preparation, the Rotate group exhibited a greater increase in volume and less accumulated hard\u2010tissue debris compared to the HyFlex group (<jats:italic>p<\/jats:italic>\u2009&gt;\u20090.05). 0.40 preparation with Rotate instruments resulted in greater volume increases across all thirds and less debris in the apical third (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). The Rotate group displayed greater transportation and lower centring ability in the apical third after 0.40 preparation (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). HyFlex and Rotate demonstrated similar performance up to the 0.25 preparation, and while differences emerged after the 0.40 preparation, both systems provided safe preparation without procedural accidents.<\/jats:p>","DOI":"10.1111\/aej.12920","type":"journal-article","created":{"date-parts":[[2025,2,4]],"date-time":"2025-02-04T09:34:56Z","timestamp":1738661696000},"page":"133-141","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Shaping Ability of Rotary <scp>NiTi<\/scp> Systems in S\u2010Shaped Root Canals of Mandibular Molars"],"prefix":"10.1111","volume":"51","author":[{"given":"Renata M. S.","family":"Leal","sequence":"first","affiliation":[{"name":"Department of Restorative Dentistry Federal University of Paran\u00e1  Curitiba Paran\u00e1 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6445-8243","authenticated-orcid":false,"given":"Emmanuel J. N. 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P.","family":"Campos","sequence":"additional","affiliation":[{"name":"Department of Restorative Dentistry Federal University of Paran\u00e1  Curitiba Paran\u00e1 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9099-4242","authenticated-orcid":false,"given":"Clarissa T.","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"Department of Restorative Dentistry Federal University of Paran\u00e1  Curitiba Paran\u00e1 Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3051-737X","authenticated-orcid":false,"given":"Marco A. 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