Abstract
Purpose This in vitro study compared root canal preparation in curved mesiobuccal canals of molar teeth using either the One Shape™ or the Neoniti (Neolix) rotary NiTi single-file systems, assessing canal transportation, instrument separation and time required for preparation. Methods. Extracted maxillary and mandibular human molar teeth with mesiobuccal canals having apical angles of curvature between 25 and 35o were selected and embedded in acrylic resin blocks, and an initial CBCT was taken. The teeth were divided into two equal groups (n = 20), and the canals were cleaned and shaped using either Neoniti™ or One Shape™ engine-driven NiTi rotary files. Each individual instrument was used to prepare 5 canals. The time required for the preparation of each canal was recorded. Postpreparation CBCT scans were taken and used to determine the extent of canal transportation at levels of 2, 4, 6, and 8 mm from the apex. The Kolmogorov–Smirnov test for normality was applied, and then, datasets were compared using independent t-tests, with a threshold of P < 0.05. Results Neoniti rotary files caused significantly less canal transportation of the curved canals (P=0.0001). On the other hand, the time required for canal preparation was significantly shorter for One Shape (P=0.0001). No instrument separation was recorded in both groups. Conclusion Based on these results, the Neoniti™ rotary file system is preferred because it maintains the original shape of curved root canals better than One Shape™; even though this benefit comes at the cost of an increase in preparation time in clinical practice, the better technical performance may be more important than a difference in procedural time.
Highlights
Development of nickel-titanium (NiTi) rotary instruments has improved the overall quality of canal preparation in endodontics, with fewer procedural errors, such as ledges, zipping perforations, and transportation [1]. ird- and TM fourth-generation files include Neoniti (Neolix, ChatresTM La-Foret, France) and One Shape (Micro-Mega, Besançon, France), respectively. ese both employ a single file used in continuous rotating motion to clean and shape the whole root canal system [2]. e main advantages of such single rotary NiTi file systems are ease of use and high efficiency, reducing the time required, which benefits both the clinician and the patient.TM Neoniti files are available in three different sizes (20/0.08, 25/0.08, and 40/0.08)
International Journal of Dentistry should be used at a rotational speed of 300 to 500 rpm and a torque limit of 1.5 N/cm, for single-length preparation to the working length [3]. e files are manufactured using a wire-cut electrical discharge machining (WEDM) process. is gives the files a rough surface, with abrasive properties, to facilitate root canal preparation
Using files in severely curved canals is challenging because the canal anatomy increases the likelihood of transportation, with the file not conforming exactly to the curved profile of the canal despite its flexibility [8]. erefore, an evaluation of the extent of canal transportation is an important aspect of assessing a NiTi rotary file system. is laboratory study aimed to compare canal transportation, preparation time, and instrument separation between One Shape and Neoniti when used to prepare severely curved root canals. e null hypothesis was that there was no difference between the two systems in terms of these parameters
Summary
Development of nickel-titanium (NiTi) rotary instruments has improved the overall quality of canal preparation in endodontics, with fewer procedural errors, such as ledges, zipping perforations, and transportation [1]. ird- and TM fourth-generation files include Neoniti (Neolix, ChatresTM La-Foret, France) and One Shape (Micro-Mega, Besançon, France), respectively. ese both employ a single file used in continuous rotating motion to clean and shape the whole root canal system [2]. e main advantages of such single rotary NiTi file systems are ease of use and high efficiency, reducing the time required, which benefits both the clinician and the patient. Ese both employ a single file used in continuous rotating motion to clean and shape the whole root canal system [2]. E main advantages of such single rotary NiTi file systems are ease of use and high efficiency, reducing the time required, which benefits both the clinician and the patient. Is gives the files a rough surface, with abrasive properties, to facilitate root canal preparation. Heat treatment of these files during their production enhances their flexibility [4,5,6]. Is laboratory study aimed to compare canal transportation, preparation time, and instrument separation between One Shape and Neoniti when used to prepare severely curved root canals. Using files in severely curved canals is challenging because the canal anatomy increases the likelihood of transportation, with the file not conforming exactly to the curved profile of the canal despite its flexibility [8]. erefore, an evaluation of the extent of canal transportation is an important aspect of assessing a NiTi rotary file system. is laboratory study aimed to compare canal transportation, preparation time, and instrument separation between One Shape and Neoniti when used to prepare severely curved root canals. e null hypothesis was that there was no difference between the two systems in terms of these parameters
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