Dental Asia May/June 2021

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User Report before file insertion is useful especially when complicated canal systems are encountered and limited mouth opening hinders canal negotiation and visualisation. TCA can be divided to in-stroke and out-stroke movements. Fig. 4g Figs. 4 a-h: Tactile Controlled Activation (TCA) technique explained Fig. 4h After accessing the pulp chamber and locating the canal orifices, technical patency to length is confirmed and the canal is enlarged up to 10/.02 (Fig. 4a). The first file of the Max Curve sequence to be used, the 15/03, is mounted on the hand piece of an endodontic motor and inserted passively inside the canal until maximum frictional resistance (point A, Fig. 4b). The file is activated and pushed apically (instroke) until the activated file resists further advancement (point B, Fig. 4c) and withdrawn from the canal (Fig. 4d). Fig. 5: S-curved mesio-buccal root in a second maxillary molar managed with HyFlex EDM Max Curve sequence and TCA technique. a. Pre-operative radiograph, b. Postoperative radiograph, c. Access cavity preparation, d. 15/.03 HyFlex EDM before activation, e. 20/.05 HyFlex EDM finishing stroke before activation, f. 20/.05 gutta percha cones, g. Clinical image of the pulp floor after obturation procedures After file withdrawal, the file is inactivated, the flutes are cleaned and checked for any possible deformations. Irrigation and patency confirmation follows. The second time that the same file will be inserted passively inside the canal it will bind deeper inside the anatomy (point B, Fig. 4e). Activating the file again the same way will guide the file even more apically closer to length (point C, Fig. 4f,g,h). The work to be done by this file is completed when the file can reach working length (point D, Fig. 4i,k) without having to activate it. After reaching working length, the second file of the Max Curve set is used the same way. Fig. 6: S-shaped mesial root of a second mandibular molar managed with the HyFlex EDM Max Curve sequence. a. Preoperative radiograph revealing deep distal carious lesion, b. Periapical radiograph with 15/.03 HyFlex EDM to working length revealing the anatomy after the deep distal margin elevation, c. Postoperative radiograph after the completion of root canal obturation, d. Post restoration radiograph The delicate apical 2mm of the 10/.05 will always remain loose inside the canal, guiding the file through the anatomy without risking engagement and breakage. The 20/.05 that follows will provide the final canal shape to disinfect and obturate the canal. 58 DENTAL ASIA MAY / JUNE <strong>2021</strong>
TREATMENT MicroMega One Curve A range of single files, in continuous rotation C.WIRE Heat Treatment The Endo DNA 25.04 25.06 35.04 45.04 100% flexible* 2,4X + more resistant* to fracture (cyclic fatigue) *in comparison with conventional NiTi Data MicroMega R&D (One Curve 25.06 vs One Shape 25.06) Safety optimisation Treats all canal anatomies 006649 03.21 www.coltene.com facebook.com/COLTENE.<strong>Asia</strong>Pacific/
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