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| industry report new products Fig. 7 u i T t e r a g r a M r D © Fig. 8 u i T t e r a g r a M r D © Fig. 9 u i T t e r a g r a M r D © Proven clinical experience According to Müller, a number of clinical studies have demonstrated the efficacy of both systems. For example, Goo et al. compared the bending stiffness, cyclic fatigue and torsional fracture resistance of NiTi rotary instruments, including V-Taper 2, V-Taper 2H (both SS White), HyFlex CM, HyFlex EDM and ProTaper Next X2 (Dentsply Sirona). HyFlex EDM showed the highest cyclic fatigue resistance of the group, with V-Taper 2H and HyFlex CM coming in next. Overall, they showed high torsional resistance. In comparison with HyFlex CM, the EDM version demonstrated a higher fracture resistance. In another study, Kaval et al. aimed to evaluate these properties in novel NiTi rotary files, including HyFlex EDM OneFile from COLTENE, ProTaper Gold and ProTaper Universal (both Dentsply Sirona). The results showed that HyFlex EDM OneFile demon- strated significantly higher cyclic fatigue resistance and higher distortion angle to fracture, but a lower torsional resistance than both ProTaper options. In addition, Pedulla et al. sought to measure the tor- sional and cyclic fatigue resistance of HyFlex EDM OneFile in comparison with VDW’s RECIPROC R25 and Dentsply Sirona’s WaveOne Primary. HyFlex was found to have a significantly higher cyclic fatigue re- sistance and higher angular rotation to fracture. Furthermore, Lacono et al. aimed to measure the wear of HyFlex EDM after clinical application. No frac- tures were registered, no wear or degradation was re- ported, and the increased fatigue resistance of HyFlex EDM (compared with HyFlex CM) allowed it to remain usable for longer when shaping severely curved canals. A case from the Philippines Dr Margaret Tiu, a clinician based in the Philippines, agrees that the increased fatigue resistance and strong flexibility of both HyFlex systems allowed her to manage an S-shaped case more easily. At a recent COLTENE Train the Trainer event (Fig. 6), she presented a mandibular first molar case with four canals that was referred to her by another dentist (Fig. 7) who could not negotiate the canal owing to its difficult anatomy (Fig. 8). After utilising the crown-down technique and the HyFlex CM files to flare the coronal third of the distobuccal and distolingual canals, Tui then continued to use HyFlex EDM to negotiate the mesiobuccal and mesiolingual canals, as she had discovered a slight curvature in the middle third of the canals. As for the S-shaped distobuccal and disto- lingual canal, she continued with the HyFlex CM files. Post obturation radiograph showed properly shaped canals with proper healing (Fig. 9)._ Dental Tribune Asia Pacific will publish another background article on the Train the Trainer event, with cases from the Phil- ippines and Taiwan, as well as other studies on GuttaFlow. References · Cytotoxicity of GuttaFlow Bioseal, GuttaFlow2, MTA Fillapex, and AH Plus on Human Periodontal Ligament Stem Cells, J Endod. 2017 May;43(5):816-822. doi: 10.1016/j.joen.2017.01.001. Epub 2017 Mar 23. https://www.ncbi.nlm.nih.gov/pubmed/28343929 · Mechanical Properties of Various Heat-treated Nickel-Titanium Rotary Instruments, J Endod. 2017 Sep 23. pii: S0099- 2399(17)30703-3. doi: 10.1016/j.joen.2017.05.025. [Epub ahead of print] https://www.ncbi.nlm.nih.gov/pubmed/?term= mechanical+properties+of+various+heat+treated+Goo+et+al. · Evaluation of the Cyclic Fatigue and Torsional Resistance of Novel Nickel-Titanium Rotary Files with Various Alloy Properties. J Endod. 2016 Dec;42(12):1840-1843. doi: 10.1016/j.joen.2016.07.015. Epub 2016 Oct 21. https://www.ncbi.nlm.nih.gov/pubmed/? term=Evaluation+of+the+Cyclic+Fatigue+and+Torsional+ Resistance+of+Novel+Nickel-Titanium+Rotary+Files+with+ Various+Alloy+Properties · Torsional and Cyclic Fatigue Resistance of a New Nickel-Titanium Instrument Manufactured by Electrical Discharge Machining. J Endod. 2016 Jan;42(1):156-9. doi: 10.1016/j.joen.2015.10.004. Epub 2015 Nov 14. https://www.ncbi.nlm.nih.gov/pubmed/?term= Torsional+and+Cyclic+Fatigue+Resistance+of+a+New+Nickel- Titanium+Instrument+Manufactured+by+Electrical+Discharge+ Machining 40 roots 4 2017