ROEN0310

22 I I clinical report _ obturation _Root-canaltreatmentconsistsof3-Dfillingof theroot-canalsystemwithgutta-perchaandsealer, withthegoalofmaximisingtheamountofsolidcore material and minimising the amount of sealer.1 Be- fore this can be achieved, the root canal must be chemo-mechanically prepared to a sufficient shape and size in order to eradicate micro-organisms within the root canal system and facilitate filling of the root canal.2 The single-cone obturation technique was intro- duced in the 1960s with the development of ISO standardisationforendodonticinstrumentsandfill- ingpoints.3 Afterreamingacircularstoppreparation intheapical2mmofthecanal,asinglegutta-percha was selected to fit with tug-back to demonstrate inlay-likesnugnessoffit.Thesingle-conetechnique consists of a single cone filled at room temperature with a sealer layer whose thickness depends on the fit of the single cone to the walls of the canal.4 The introduction of NiTi rotary instruments makes the creation of predictably centred prepara- tions more realistic than ever in curved canals5 and, in many cases, may make accurate apical cone fit a possibility.6 Preparation of the canal using certain rotaryNiTifilesandfillingthecanalwithanon-stan- dardised cone may result in a shape that does not matchthecorrespondinggutta-perchapoint.7–9 This would result in either the pooling of sealer or voids in the inner or outer walls of the canal. Obturation conesarenowproducedtomatchthetaperandsize of canals prepared with rotary instruments in order to provide 3-D obturation of the root canal over its entire length. This obturation can be achieved with- out requiring accessory cones or spending time on lateral condensation. Manufacturers of matched taper points claim that they can replicate tapered canals effectively, as they correspond to canal shapes created by instruments of similar tapers. The use of a NiTi file-matched, taper-sized cone system promotes the single-cone cementation technique and has been advocated for obturation of curved root canals.10 The aim of this study is to describe a root-canalfillingmethodusingthesingle-matched, taper-sized gutta-percha cone technique. _Description of the technique Access to the root-canal system was carried out usingasize10filethatwasintroducedintothecanal. Full working length was established by deducting 1mm from the actual canal length. After introduc- tion of hand files and establishment of a glide path, the canal was prepared with a NiTi rotary system according to the manufacturer’s instructions. Dur- ing preparation and between each file, 2% sodium hypochlorite was used as an irrigant. After comple- tion of instrumentation, a final flush using 17% EDTA was performed and dried with paper points. A single gutta-percha cone that matches the taperandsizeofthefinalrotaryinstrumentwasthen selectedandfittedtothedesignatedworkinglength with tug-back. AH Plus Root Canal Sealer (DENTSPLY DeTrey) wasmixedmanuallyandappliedintotherootcanal usingalentulospiral.Thesingle-matchedconewas then coated with additional sealer to the proper length. A heating instrument was used to cut the match point within 3mm of the orifice, which was then condensed vertically using an endodontic plugger. roots3_2010 Introduction of a novel obturation method: The single-matched, taper-sized gutta-percha cone technique Author_ Dr Mohammed A. Alshehri, Saudi Arabia

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