The use of computed tomography when comparing nickel–titanium and stainless steel files during preparation of simulated curved canals

Abstract

Ni-Ti instruments produced preparations with adequate enlargement, less transportation, and a better centring ratio.

Cone-beam Computed Tomography Evaluation of Root Canal Preparation using Various Rotary Instruments: An in vitro Study

“…less straightening or decentralization of the canal, and a rounder canal preparation even in severely curved root canals. [3][4][5][6][7] Deviation from the original curvature can lead to excessive or inappropriate dentin removal, straightening of the canal and creation of ledge in the dentinal wall, a biomechanical defect known as elbow, which forms the coronal to the elliptical-shaped apical seal, canals with…”

Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file

“…The simulated canals in resin blocks used in this study does not permit the action of the instruments in root canals of real teeth because of differences in the surface texture, hardness and cross-section. However, resin blocks allow a direct comparison of the shaping ability of different instruments and studies on extracted teeth fully confirmed observations made on resin blocks 3,5) . As use of simulated canals in resin blocks would have more binding of instruments, the study of with the use of real teeth will be necessary.…”

“…NiTi instruments have two to three times higher elastic flexibility and a superior resistance to torsional fracture, compared with similar-sized conventional stainless steel instruments [1][2][3][4][5] . Also, rotary instrumen- The aims of this study were to compare the shaping effect and safety between single length technique recommended by manufacturer and crown-down technique using Mtwo rotary file and to present a modified method in use of Mtwo file.…”

“…Therefore those instruments can effectively produce a well-tapered root canal form sufficient for obturation with minimal risk of transporting the original canal, and are useful to the preparation of curved root canals 1,[3][4][5]7) . Various NiTi instrument systems have been introduced in the market; ProTaper (Dentsply Maillefer, Ballaigues, Switzerland), ProFile (Dentsply Maillefer, Ballaigues, Switzerland), Hero642 (Micromega, Besancon, France), K3 (SybronEndo, Glendora, France), etc.…”

Comparison of apical and coronal sealing in canals having tapered cones prepared with a rotary NiTi system and stainless steel instruments

“…The most important parameter for evaluating the effectiveness of instruments is their ability to deliver efficient cleaning and shaping while preserving the Table 1 Statistical values of the instruments used Table 2 Statistical values on coronal leakage (P < 0.05) Table 3 Statistical values on apical leakage curvature of the canal during the operation (14). Various studies have reported that the utilization of nickel titanium instruments, by causing less transportation than stainless steel instruments at both the middle and apical thirds, results in shaping at the apical third that closely resembles the original canal form (15). The literature also indicates that motor-driven nickel titanium instruments create canal shapes that are more circular and homogeneous in form (1).…”