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30 I I clinical technique _ WaveOne only the first hand file into the canal will aid in the selection of the WaveOne file as follows: 1. If a 10 K-file is very resistant to movement, use WaveOne Small file. 2. If a 10 K-file moves to length easily, is loose or very loose, use WaveOne Primary file. 3. If a 20 hand file or larger goes to length, use WaveOne Large file. Single-fileshaping 1. take hand file into canal and watch-wind to length or resistance (approximately two-thirds of canal length); 2. use appropriate WaveOne file to approximately two-thirds of canal length; 3. irrigate copiously; 4. take hand file to length and confirm with an apex locator and radiograph; 5. take WaveOne file to length; 6.confirm foramen diameter with hand file the same sizeasWaveOnefile;ifsnug,preparationiscomplete; 7. if foramen diameter is larger than WaveOne file, consider the next larger WaveOne file; 8. majority of cases will be completed with WaveOne Primary file. Guidelinesforuse 1. use WaveOne files with a progressive up and down movement no more than three to four times, only little force is required; 2. remove file regularly, wipe clean, irrigate and con- tinue; 3. if file does not progress, confirm patent canal and consider using a smaller WaveOne file; 4. whilst glide path management is minimal with WaveOne shaping files, some practitioners will be more comfortable if the glide path is first secured with PathFiles (DENTSPLY Maillefer); 5. in severely curved canals, complete apical pre- paration by hand if reproducible glide path is not possible; 6. WaveOne files can be used to relocate the canal orifice and expand coronal shape; even in a recip- rocatingmotionusethemwitha“brushing”action short of length to achieve this; 7. never work in a dry canal and constantly irrigate with NaOCl and later EDTA; 8.as preparation time is short, activate the irrigating solutionstoenhancetheireffect;theEndoActivator (DENTSPLY Maillefer) is ideal for this (Fig. 9).12 WaveOneobturatingsolutions Obturation of the root-canal system is the final step of the endodontic procedure. The WaveOne system includes matching paper points, gutta- percha points and Thermafil WaveOne obturators (Figs. 10–12). The matching gutta-percha points can be used in conjunction with the Calamus Dual 3-DObturationSystem(DENTSPLYMaillefer;Fig.13) as demonstrated in the following cases. Fig.9_EndoActivatorirrigationdevice. Fig. 13_Calamus Dual 3-D Obturation System. Fig. 10_WaveOne matching paper points. Fig. 11_WaveOne matching gutta-percha points. Fig. 12_WaveOne matching Thermafil obturators. roots1_2011 Fig. 13Fig. 9 Fig. 10 Fig. 11 Fig. 12