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Clinical Master Magazine

issue 1/2015 — 63EndodonticsArticle Fig.6Fig.5 Fig.7 Fig.4 Fig.8 Fig.9 Fig.10 Fig. 9 This lower molar was treated through an access opening that was less than 2mm square, cut just behind the MB triangular ridge. Note the definitive treatment of the apical thirds of all four canals, despite the narrow entry portal (courtesy Dr. Charles Maupin). Fig. 10 Postoperative radiograph of a mandibular molar treated through an alternative to the truss configuration  –an “X-entry” access cavity –a design that minimizes removal of tooth structure in the critical trunk of the tooth (author's case). Fig. 11 Virtual treatment planning for CT-Guided Endodontic Access (CT-GEA). The tooth to be treated is segmented from the CT volume, ideal access entry paths are plot- ted through the occlusal surface of the tooth, and a CT-GEA drill is 3-D printed (left-to-right). Fig. 12 Author's root-fractured #18; that tooth set in stone model after extraction, with the printed CT-GEA drill guide mounted and the first drill in place; the two small access entry holes cut using the drill guide; and a post- exercise radiograph show- ing cones fit in canals after they were negotiated, shaped, and cone fit (left- to-right). Fig.11 Fig.12

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