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40 I I new product technique _ shaping canals Primary file, irrigate, recapitulate with a #10 hand file and re-irrigate. _ContinuewiththePrimaryfile,intwotothreepasses, to pre-enlarge the coronal two-thirds of the canal. _In more restrictive canals, use a #10 hand file in the presence of a viscous chelator and negotiate to the terminus of the canal. Gently work this file until it is completely loose at length. _Establish working length, confirm patency and ver- ify the glide path. _Expand this glide path to at least 0.15mm using a manual or mechanical glide path file. _CarrythePrimaryfiletothefullworkinglength(Fig.10) inoneormorepasses.Uponreachingworkinglength, remove the file to avoid over-enlarging the apical foramen.Inspecttheapicalflutes;iftheyareloaded with dentinal debris, then the shape is finished (Fig. 11).* _If the Primary file does not progress, use the Small file (020.07 yellow) in one or more passes to work- ing length and then use the Primary file to working length to optimise the shape. _Whentheshapeisconfirmed,proceedwith3-Ddis- infection protocols. * If the Primary file is loose at length with no dentinal debris on the apical flutes, continue shaping with the Medium or Large file. _Obturation solutions Obturation of the root canal system is the final step of the endodontic procedure. The WaveOne GOLD system includes matching paper points, gutta- percha points and Thermafil obturators (Fig. 12). The newnanotechnology-engineeredgutta-perchapoints with their extended heat flow are ideal for all warm vertical compaction (WVC) techniques (Figs. 13a–c, 14a–c & 15a–c). WaveOne GOLD shapes can also be effectivelyobturatedwithGuttaCore(DENTSPLY),the cross-linked gutta-percha core obturator. _Conclusion WaveOne GOLD is a safe, efficient and simple system for preparing canals. Sophisticated metal- lurgy and design result in improved flexibility and cyclic fatigue life with less binding and torsional stressonthefileduringwork.Thefearofinstrument breakage should be eliminated for many clinicians byusingWaveOneGOLD.Rootcanalpreparationwith WaveOne GOLD is very cost-effective, since 80% of cases can be completed with the single Primary in- strument. Single use eliminates the need to spend valuable time and unnecessary expense in sterilising procedures, with further benefits in cost savings. Faster preparation time allows the clinician to focus onthemostimportantaspectofclinicalendodontics, disinfection, thus fulfilling the mechanical and bio- logical objectives of shaping canals. WaveOne GOLD has set a new standard and shap- ingcanalswithconfidenceisnowaclinicalrealityfor all._ Editorial note: The author has a commercial interest in WaveOne and WaveOne GOLD file systems. A list of referencesisavailable from the publisher. Figs. 15a–c_The series of pre- and post-op radiographs of tooth #46 demonstrates the ability of WaveOne GOLD to shape considerable curvatures in canals that are long, curved and narrow, following the apical anatomy. All canals were obturated with WVC. roots1_2015 Dr Julian Webber has been a practising endodontist in London,England for over 35 years.He was the first UK dentist to receive a master’s degree in endodontics from a university in the USA (Northwestern University,Chicago,IL) in 1978.He has lectured extensively and given many hands- on courses on endodontics worldwide. He has published in numerous peer-reviewed journals and contributed numerous chapters to endodontic texts. DrWebber is a former President of the British Endodontic Society andAmerican Dental Society of London,a faculty member of the Pacific Endodontic Research Foundation in San Diego,CA,Honorary Professor at the University of Belgrade in Serbia, and an honorary member of the Ukrainian Medical and StomatologicalAcademy. He is a fellow of the International College of Dentists and an active member of the AmericanAssociation of Endodontists.He is the editor-in-chief of Endodontic Practice (UK) and a board member of many prestigious dental journals. _about the author roots Fig. 15a Fig. 15b Fig. 15c