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The second premolar (tooth 45) was diagnosed with symptomatic irreversible pulpitis. The radiographic examination revealed a dilacerated S\u2010shaped root configuration, with 2 severe curvatures of &lt;2\u00a0mm radius. Under local anaesthesia and rubber dam isolation, a glide path was created until a size 10\u00a0K\u2010file reached working length. Instrumentation to larger size was achieved with a novel approach using controlled memory files. The controlled memory files were pre\u2010curved and passively inserted below the curvature until maximum frictional resistance. The motor was activated by maintaining light apical pressure, and the files were withdrawn from the canal. This procedure was repeated until each file could reach the working length. Chemical disinfection was achieved with positive syringe irrigation of 6% Na<jats:styled-content style=\"fixed-case\">OC<\/jats:styled-content>l, followed by 17% <jats:styled-content style=\"fixed-case\">EDTA<\/jats:styled-content> rinsing and manual dynamic gutta\u2010percha activation of the irrigants. Canal filling was achieved using the continuous wave of condensation technique and thermoplasticized injectable gutta\u2010percha backfill. The postoperative radiography revealed that the initial canal anatomy of the dilacerated double\u2010curved root canal was preserved.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.12610","type":"journal-article","created":{"date-parts":[[2016,1,20]],"date-time":"2016-01-20T15:28:48Z","timestamp":1453303728000},"page":"202-211","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Root canal treatment of a dilacerated mandibular premolar using a novel instrumentation approach. 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