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ducing a mechanised file. This also allows patency to be checked and any potential difficulties that are not apparent on the pre-operative radiograph to be assessed. Gauge canal diameter apically with K
files and prepare accordingly. It is impor- tant that the apical part of the canal has some mechanical preparation. K files can be used to enlarge the apical part of canal if required, rather than using a further Reciproc if, for example, an R25 progresses too passively to length, K files size 30 or 35 could be used to finish the apical prepara- tion, without significant increase in cost or time. Similarly if after the canal has been
prepared to the selected Reciproc size and a matched GP master cone goes beyond the working length when tried in, the apical part of the tooth should be prepared further by hand filing, and an appropriate size of GP master cone selected. Matched GP cones to Reciproc Instru-
ment Sizes are available, but as in other systems these are not to be assumed to provide 3D obturation. Compaction of GP and use of accessories in cold techniques or warm vertical compaction of GP will create less voids and a less sealer heavy obturation. As with any instrumentation system, the
Reciproc system is not appropriate for all canals. In cases of extreme curvature and where blockages or ledges need to be nego- tiated, or in extremely narrow canals hand files or other systems may be required. The effectiveness of the irrigation can
be improved by a variety of measures such as using warmed sodium hypochlorite, or activating the irrigant to improve penetra- tion, either sonically or ultrasonically5.
Summary I thoroughly recommend Reciproc to any practitioner keen to improve safety, predictability and cost effectiveness of endodontic treatments. As with all new systems there is an initial set-up cost, and a learning curve. The Introduction Kit which includes the VDW Reciprocating motor comes with a number of files, paper points and GP points, as well as plastic training blocks to try out the system in vitro. I would advise that the system be used first on a number of extracted teeth until the practitioner feels comfortable and confident with the technique. This will however in my experience not take long and the Reciproc system will quickly become the first option for most endo- dontic treatments. The Reciproc system is exclusively available from Quality Endo- dontic Distributors, the very well known and reliable endodontic suppliers.
REFERENCES
1 Yared G. Preparation Using only One NI-Ti rotary instrument: Preliminary Observa- tions Internation Endo- dontic Journal 2008 41: 339-44 2 Roane et al. The Balanced Force Concept for Instru- mentation of Curved Canals, Journal of Endodontics 1985, 11:203-11 3 Peirkis P and
Messer H: Rotary Ni-Ti Instrument Fracture and its Consequences. Journal of Endodon- tics November 2006, 32:11;1031-1043 4 Burklein et al. Shaping Ability and cleaning effectiveness of two single files systems in severely curved root canals of extracted teeth: Reciproc and Wave One versus Mtwo and Protaper International Endodontic Journal: May 2012:45:5 449-461 5 Li-Sha Gu et al. Review of Contempo- rary Irrigant Agita- tion Techniques and Devices. Journal of Endodontics 35:6;791- 804
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