Evaluating In Vitro Performance of a Novel Stainless Steel Rotary System (Gentlefile) Based on Debris Extrusion and Instrumentation Time

Abstract

The new Gentlefile (GF) system, made of stainless steel and developed by MedicNRG in Kibbutz Afikim, Israel, claims to have advantages over traditional nickel-titanium files. However, research has shown that nickel-titanium files are mechanically superior due to their increased flexibility, cutting efficiency, and ability to maintain canal anatomy with less risk of procedural errors. This study compared the amount of debris extrusion and the time required for root canal instrumentation using GF versus the nickel-titanium ProTaper Universal (PTU) system and a manual step-back (MSB) stainless steel technique. This in vitro experimental study utilized 66 extracted human single-canal mandibular premolars with mature apices and root curvature of less than 10 degrees. The teeth were randomly divided into three groups ( n = 22 ) and standardized for working length before being placed in preweighed vials. Group 1 was instrumented with PTU, Group 2 with GF, and Group 3 with the MSB technique. Extruded debris was collected in the vials, dried in an incubator, and weighed using the same scale. The change in weight indicates the debris amount. Instrumentation time was recorded using a stopwatch. The normal distribution of data was assessed using the Kolmogorov-Smirnov test. The groups were then compared regarding the amount of extruded debris and instrumentation time using the Kruskal-Wallis test and one-way ANOVA, followed by the Games-Howell test, respectively ( alpha = 0.05 ). No significant difference in apical debris extrusion was found among the three groups ( P > 0.05 ). However, a significant difference in instrumentation time was detected between the groups ( P < 0.05 ). MSB instrumentation took significantly longer than both the PTU ( P = 0.001 ) and GF ( P = 0.001 ) systems. The GF system did not demonstrate reduced apical debris extrusion or faster instrumentation time compared to PTU. MSB had the longest instrumentation time compared to the other techniques.

Experimental and Statistical Study of Flexural Strength in Ternary Blended High-Performance Concrete using Alcofine

“…, 01012 (2024) E3S Web of Conferences https://doi.org/10.1051/e3sconf/202449101012 491 ICECS'24 flexural strength test is a critical evaluation in determining the ability of concrete to withstand bending or tensile stresses. In this comparative study, the focus is on the flexural strength of M30 grade concrete, with two distinct groups under investigation: Group 1, consisting of Conventional Concrete, and Group 2, comprising Ternary Blended Concrete with 20% Alccofine [19]. In the independent samples test conducted to compare the flexural strength of two different concrete types, Levene's test for equality of variances was initially performed to assess whether the variances of the two groups were equal.…”

Extrusion of Sodium Hypochlorite in Oval-Shaped Canals: A Comparative Study of the Potential of Four Final Agitation Approaches Employing Agarose-Embedded Mandibular First Premolars

“…In comparison to traditional needle irrigation, this motion makes irrigation more successful since it lowers the possibility of pushing the irrigant into periapical tissue, which can happen when positive pressure is used. Furthermore, PUI breaks the apical vapor lock to allow lateral canal penetration, guaranteeing optimal irrigant penetration for the duration of the working length [40]. A number of variables, such as the depth of needle insertion, the degree of root canal curvature, the activation of NaOCl and its ongoing replenishment, and anatomic differences of the lateral canals, might affect how successful PUI is.…”

“…The unique characteristics of the Gentle File Finisher Brush provide a thorough understanding of its much lower extrusion levels at rapid speeds [40]. The brush has six stainless steel strands that automatically extend outward when spun in a handpiece at 6500 rpm.…”