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ePaper created 2017-09-12, 09:26:18 | version 1.38.0
files are manufactured with the same technique as described above for the WaveOne Gold Glider, to produce a file with super-elastic NiTi metal proper- ties. The WaveOne Gold Primary file (Dentsply Sirona) is 50 % more resistant to cyclic fatigue, 80 % more flexible, and 23 % more efficient than the con- ventional WaveOne Primary instrument.16–18 This unequal clockwise (CW) and counter-clock- wise (CCW) reciprocating motion of the WaveOne Gold system has the following advantages over continuous rotation systems: · Binding of the instruments into the root canal dentine walls is less frequent, reducing torsional stress.19 · Reduction of the number of cycles within the root canal during preparation results in less flexural stress on the instrument.20 Improved safety, as the CCW disengaging angle is designed to be less than the elastic limit of the instrument.17 · · There is decreased risk of instrument fracture.19, 21 It allows the file to easily progress towards work- · ing length without using potentially dangerous inward pressure.17, 21 WaveOne Gold files are characterised by a parallel- ogram (with two 85 degree cutting edges), off-cen- tred, cross-section.18 According to Ruddle, this de- sign limits the engagement between the file and the dentine to only one or two contact points at any given cross-section.17 This will subsequently reduce taper lock and the screw-in effect, improve safety, and cut- ting efficiency.16, 17 The newly designed files is also manufactured with an ogival, roundly tapered and semi-active guiding tip to ensure that the files pro- gress safely along canals with a secured and con- firmed reproducible glide path.17, 18 Conclusion The preoperative planning stage using the 3D Endo Software provided the authors with vital infor- mation regarding the complex root canal anatomy that influenced the choice of materials and tech- niques in this case report. Because the root canal anatomy could be visualised in 3-D preoperatively, the authors realised that there would be a high risk of either losing working length or instrument frac- ture during canal preparation. It was therefore very important to secure the canals by means of glide path preparation and enlargement prior to root canal preparation._ References [1] American Association of Endodontists. Glossary of Endodontic Terms [Internet]. 2012. Available from: http://www.aae.org/ publications-and-research/glossaries-and-guides/glossaries- guides.aspx Fig. 26 Fig. 27 Fig. 28 treating complex root canal anatomy case report | Fig. 23 Fig. 24 Fig. 25 Fig. 23: A ProGlider was used in a rotary motion to expand the glide path in the palatal root canal. Fig. 24: A ProGlider, converted to a manual file, was used to expand the glide paths in the two buccal root canals. Fig. 25: A WaveOne Gold Glider was used in a reciprocating motion to further expand the glide paths in the two buccal root canals. Fig. 26: The Primary WaveOne Gold file (25/07) was used to complete canal preparation in the palatal root canal. Fig. 27: The Small WaveOne Gold file (20/07) was used to complete canal preparation in the two buccal root canal systems. Fig. 28: Periapical radiograph showing the result after obturation. Note the evidence of an additional canal loop in the mid-root area on the mesiobuccal root canal system that was obturated. roots 3 2017 29