![]() ![]() ROTATION VERSUS RECIPROCATION There are both advantages and disadvantages associated with utilizing a continuous rotation versus a reciprocation movement when shaping canals. Focus will be on a concept, technology, and technique that enable transitioning an unshaped canal to a fully shaped canal with, typically, one single file. The following article will identify the critical distinctions between shaping canals using continuous rotation versus a reciprocation method. This vastly improved system has been branded WaveOne Gold (DENTSPLY Tulsa Dental Specialties and DENTSPLY Maillefer). For example, the selection of a shaping file system is oftentimes determined by whether a dentist practices solo, in a private group practice, or is employed in corporate dentistry.īalancing treatment objectives with technical and humanistic factors, the WaveOne single-file shaping system was conceived and came to market in 2011.3 Since then, much has been learned, 4 and through this process, a new generation has emerged that provides excellent safety, effortless efficiency, and super simplicity. From several decades of practicing and teaching endodontics, I have learned there are other conscious and subconscious decisions influencing file selection. This image depicts how an alternating offset and transitioning parallelogram-shaped cross section limits the engagement between the file and dentin.Īlthough these classifications prognosticate performance, sway choices, and instigate trends, endodontic behavior is further manifested in the time-honored expression, “Who you are is where you were when.” Dentists make decisions based on where and when they were trained, and who trained them as well as whether they practice as general practitioners or specialists. A decreasing percentage tapered design improves flexibility and conserves remaining dentin in the body of the prepared canal.įigure 4. The Small, Primary, Medium, and Large WaveOne Gold (DTDS and DENTSPLY Maillefer) files.įigure 3. Finally, mechanical systems are identified as to whether a single-file or a multifile sequence is required to shape a canal.įigure 2. Additionally, a file is categorized as to whether it has a centered or offset mass of rotation, works with a rotary or reciprocating motion, and in the instance of reciprocation, whether the clockwise (CW) and counterclockwise (CCW) angles are equal or unequal. Further, it is useful to know whether a file has benefited from heat treatment, as this technology improves flexibility and the resistance to cyclic fatigue. ![]() Most shaping systems are described by whether any given file has active or passive cutting edges, a fixed or variable taper along its active portion, or a more traditional or unique cross-sectional design. ![]() Pre- and post-treatment images, with WaveOne (DENTPLY Tulsa Dental Specialties ) shapes, EndoActivator (DTDS) disinfection, and 3-D filling (courtesy of Dr. 2 Regardless of the preparation philosophy, methods should be utilized that promote the exchange of irrigant, 3-D disinfection, and filling root canal systems (Figure 1).įigure 1. 1 Certainly, the cost associated with preparing any given canal is a factor that is influenced by the market, and the clinical and business practice models. Clinically, the shaping experience is measured by safety, cutting efficiency, and the fewest number of files required to minimally or fully prepare a root canal. Altruistically, the most important factor should be the desire to produce a predictably successful shaping result. Influence of Coronal Flaring on the Shaping Ability of Two Heat-Treated Nickel-Titanium Endodontic Files: A Micro-Computed Tomographic Study.INTRODUCTION There are many factors that serve to influence which endodontic mechanical file system or hybrid technique is selected to prepare any given canal. A Comparative Evaluation of the Apically Extruded Debris from Root Canals Prepared by R-Motion NiTi File SystemĮffects of Autoclave Sterilization on Cyclic Fatigue Resistance in 5 Types of Rotary Endodontic Instruments: An In Vitro Studyīuckling resistance, torque, and force generation during retreatment with D-RaCe, HyFlex Remover, and Mtwo retreatment files ![]()
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