![]() An additional 15 blocks did not have glide paths. Kwak et al from Pusan National University, South Korea, investigated the effect of glide paths on new reciprocating NiTi files by establishing glide paths in 15 resin endodontic training blocks using rotating files specifically designed to create such a path (ProGlider, Dentsply/Maillefer Figure 1, see above). It is not clear, however, whether the new and improved NiTi files, particularly those that reciprocate within the canals rather than rotate 360°, need a glide path prepared as do the older NiTi files. ![]() Creating a glide path of sufficient size before introducing the initial rotary NiTi file into the canal has been shown to significantly reduce the risk of file breakage. ![]() Over the years, research has discovered that one way to reduce the risk of torsional failure is to establish am Endo “glide path” down to the apical area of the tooth prior to using the motor-driven shaping NiTi files. These improvements, however, have come at some cost to the torsional strength. ![]() Many manufacturers of NiTi files have, with some success, actively developed new file designs and heat treatments of the NiTi alloy to improve cyclic fatigue and flexibility of the NiTi files, thereby reducing the risk of file breakage when they are used inside the canals. If the torque control of the motor does not sense this, the file will break, leaving the tip firmly engaged inside the canal. Torsional failure occurs when the tip of the file engages inside the canal such that it does not rotate anymore, but the motor continues to rotate the rest of the file.Cyclic fatigue occurs when the file has been bent too many times repeated tension and compression stresses cause fatigue crack propagation, and the file simply breaks.NiTi files principally break for 2 reasons: The likelihood of a successful therapy can thereby be greatly diminished. If a file breaks inside a canal, it is usually very difficult, if not impossible, to retrieve it, and it is not possible to further instrument and irrigate beyond it. However, they do come with one important disadvantage: a higher risk of file separation or breakage compared with stainless steel hand files. Listeners should use their best judgment in evaluating the merits of any content.It has been well established that nickel-titanium (NiTi) alloy files are able to maintain the original canal shape during the instrumentation procedure. Presentations may include opinion, speculation and other statements not verifiable in the scientific method. The AAE provides this material for the purposes of continuing education and the merits and relevance of each presentation are to be determined by each viewer and listener. Concerns or complaints about a CE provider may be directed to the provider or to the Commission for Continuing Education Provider Recognition at ada.org/cerp. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry. ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providers of continuing dental education. Programs of the AAE (#214682) are accepted by AGD for Fellowship/Mastership credit. The AAE is an ADA CERP Recognized Provider, a recognized provider in California (#2030) and Florida (#PP0049). ± The educator member rate is honored for any full-time educator who has elected the life member type, upon submitting proof of full-time educator status to the AAE. ![]() * The reduced rate is offered to members who purchase their Online CE subscription at the time of their dues renewal. Subscriptions run July 1, 2023, through June 30, 2024.Īctive, Active 2nd Year, Associate, Disabled Active, Federal Dental Health Services, International, International 2nd Year, Life, and RetiredĪctive 1st Year, Educator±, Honorary, International 1st Year, International Resident, Predoctoral Student, and Resident Want to secure the reduced rate featured below? Bundle your new or renewed Endo On Demand subscription with your 2023-2024 membership dues! SUBSCRIPTION RATES ![]()
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