Shaping ability of the profile 25/0.06 and protaper F2 in rotary motion, and reciproc in simulated canals

Abstract

BackgroundSince the introduction of nickel–titanium (Ni–Ti) instruments to dentistry, a wide variety of Ni–Ti instruments have become commercially available. These Ni–Ti instruments are expensive, which limits their usage in developing countries and forces practitioners to use instruments repeatedly. Another problem is the possible prion cross-contamination associated with the multiple usage of endodontic instruments. In addition, the use of these instruments requires new skills and experience. In this article, the shaping capacities of two conventional rotary file systems, ProFile 25/0.06 and ProTaper F2, were reviewed and compared with the Reciproc single-file system.MethodsA total of 45 simulated canals with 40° curvature, in clear resin blocks, were prepared using conventional rotary systems consisting of ProFile orifice shaping (OS) #3 and final flaring #25/.06, Reciproc R25, and ProTaper shaping file SX and finishing file F2. Pre-and post-instrumentation images were analyzed at ten different levels, using AutoCAD 2007 software. The measurement positions were defined in 1-mm intervals: positions 0–3 established the apical part, positions 4–6 constituted the middle part, and positions 7–10 established the coronal part of the canal. The amount of removed resin, the transportation, instrumentation time, change in working length (WL), instrumentation fractures, and the presence of ledge were evaluated. Data were analyzed using ANOVA, Kruskal–Wallis and independent t-test (p < 0.001).ResultsProFile removed the least resin (p < 0.001) and caused less transportation than Reciproc and ProTaper, in total (p < 0.001). ProTaper caused more transportation ProFile and Reciproc in the apical part (p < 0.000). Reciproc caused more transportation than ProTaper and ProFile (p < 0.001), and the transportation tendency toward the inner aspect of the curvature in the middle part. Reciproc caused the less transportation than ProFile and ProTaper in the coronal part. The transportations tended to occur toward the outside of the curvature, except the middle part with Reciproc and at points 5 and 6 with ProTaper. There were no significant differences among the groups in terms of maintaining the original WL. Reciproc was significantly faster than the others group (p < 0.001). Only one instrument fracture (25/0.06 ProFile) was noted. All groups showed one ledge each.DiscussionThe results of the present study showed that both ProFile 25/06 and ProTaper F2, combined with a file used for coronal enlargement (OS3 and SX), have the potential to create satisfactory canal shape in the curved root canals. Further studies using real human teeth are needed to confirm our results.

Impact of Radial Lands on the Reduction of Torque/Force Generation of a Heat-Treated Nickel-Titanium Rotary Instrument

“…Radial lands are believed to prevent deviation of canal preparation from the curvature by their passively cutting nature that helps keeping a rotating instrument centered in the canal [36]. In fact, some studies have demonstrated that landed instruments such as ProFile [20,21] and JZ [22] exhibit a better ability to maintain canal curvature compared with non-landed instruments. This study, however, failed to demonstrate any significant difference between JZ and the non-landed JZ in terms of canal-centering ability, which could be due to the increased flexibility of these instruments resulting from the heat treatment [22].…”

“…A radial-landed design was incorporated in several early generations of NiTi rotary instruments, such as ProFile (Dentsply Sirona, Ballaigues, Switzerland), which has three landed areas in a cross-section. ProFile produces significantly less transportation compared with non-landed instruments with actively cutting blades [20,21] and generates smaller screw-in force compared with non-landed instruments [9]. Nevertheless, later, NiTi rotary systems were designed usually with actively cut blades without radial lands to increase the cutting efficiency [19], although this could give rise to a certain risk of preparation errors such as canal straightening [20,21].…”

The Effect of Different Preparation Times on The Taper and Shape of Simulated Root Canals Using The XP-Endo Shaper Rotary File

“…In this study a stereomicroscope was used similar to other studies in this filed (24,25,26,27) . Stereomicroscopy was preferred over other methods because of its low cost, availability, simplicity of use and no risk of radiation exposure.…”

An Investigation of the Accuracy and Reproducibility of 3D Printed Transparent Endodontic Blocks

“…Some studies used extracted teeth to better simulate clinical situation but range of variations in the anatomy of root canals of teeth makes the study results difficult to interpret and reproduce (7,8). Therefore, some other studies used artificial canals made of clear cast resin for their uniformity (9,10). Transparent simulated root canal models also allow for overlapping pre-and post-instrumentation images to evaluate the preparation (11).…”