{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T12:21:34Z","timestamp":1788351694919,"version":"build-2803163510"},"reference-count":25,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"9","license":[{"start":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T00:00:00Z","timestamp":1788134400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>This study aimed to evaluate the interaction between different ultrasonic troughing tips and varying retrieval tools in removing separated instruments from the apical third of the mesiobuccal (MB) root canal of maxillary molars, focusing on dentin loss and retrieval time.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>\n                      Sixty MB canals from extracted human maxillary first molars were used. A size 25\/04 Nickel\u2013Titanium file was intentionally fractured beyond the curve. Teeth were randomly assigned according to the troughing method (Ultra-X golden tip vs. ET25 L tip) and retrieval tool (BTR Pen vs. modified tube technique). Cone-beam computed tomography was used to measure dentin thickness before and after retrieval. Statistical analysis used two-way analysis of variance, Tukey\u2019s HSD\n                      <jats:italic toggle=\"yes\">post hoc<\/jats:italic>\n                      test, and Kruskal\u2013Wallis tests (\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      &lt; 0.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      ET25 L group paired with the BTR Pen caused the greatest dentin loss (0.3035 \u00b1 0.17 mm), while the ET25 L paired with the tube technique resulted in the least (0.2218 \u00b1 0.13 mm). For retrieval time, the ET25 L tip was significantly faster than the Ultra-X tip (\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      &lt; .001), regardless of the retrieval tool used.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>The ET25 L tip paired with the modified tube technique provides the most conservative and time-efficient approach for retrieving apically separated instruments.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.4103\/jcde.jcde_591_26","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T14:00:18Z","timestamp":1788184818000},"page":"1033-1037","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":0,"title":["Evaluation of different methods for separated file retrieval from the apical third of curved root canals: In vitro study"],"prefix":"10.4103","volume":"29","author":[{"given":"Mohamed Saad Mounir","family":"Ahmed","sequence":"first","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marwa El-Sayed","family":"Sharaan","sequence":"additional","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nelly","family":"Abdelsalam","sequence":"additional","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt"},{"name":"Department of Restorative Dental Sciences, College of Dentistry, Gulf Medical University, Ajman, UAE"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","published-online":{"date-parts":[[2026,8,31]]},"reference":[{"key":"R1-20260902","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1016\/j.joen.2016.09.001","article-title":"Evaluation of two trephine techniques for removal of fractured rotary nickel-titanium instruments from root canals","volume":"43","author":"Yang","year":"2017","journal-title":"J Endod"},{"key":"R2-20260902","doi-asserted-by":"crossref","first-page":"126","DOI":"10.4103\/JCDE.JCDE_248_23","article-title":"Revolutionizing endodontics: Advancements in nickel-titanium instrument surfaces","volume":"27","author":"Agrawal","year":"2024","journal-title":"J Conserv Dent Endod"},{"key":"R3-20260902","doi-asserted-by":"crossref","first-page":"619","DOI":"10.1016\/j.joen.2011.02.016","article-title":"Removal of broken files from root canals by using ultrasonic techniques combined with dental microscope: A retrospective analysis of treatment outcome","volume":"37","author":"Fu","year":"2011","journal-title":"J Endod"},{"key":"R4-20260902","first-page":"7940126","article-title":"Broken file retrieval in the lower right first molar using an ultrasonic instrument and endodontic micro forceps","author":"Meidyawati","year":"2019","journal-title":"Case Rep Dent 2019"},{"key":"R5-20260902","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1016\/j.joen.2006.12.018","article-title":"Evaluation of the efficiency of a new file removal system in comparison with two conventional systems","volume":"33","author":"Terauchi","year":"2007","journal-title":"J Endod"},{"key":"R6-20260902","first-page":"70","article-title":"Broken instrument removal. 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