Evaluation of Cutting Capacity in Two Types of Rotary Nickel-Titanium Instruments

Abstract

Objective: To perform laboratory analysis of the cutting ability of K3 and RT Densell files. Material and Methods: Fifty simulated root canals made of heat-curing phenolic resin, were divided into two groups were used. Group RT Densell consisted of specimens instrumented with files from the RT Densell rotary system, while the specimens in Group F3 were instrumented with files from the K3 rotary system. The simulated canals were weighed before and after instrumentation to analyze the amount of resin removed by each system. The statistical analysis of the results was performed using the program BioEstat 3.0. Descriptive statistics were applied to show the minimum and maximum data values, arithmetic mean, standard deviation and coefficient of variation, followed by statistical inference with a significance level of 5% Results: The data collected revealed that the rotary system nickel-titanium files of RT Densell brand removed 615 milligrams and the rotary system files K3 454 milligrams removed after five instrumentations. Through statistical test "t" Student, the difference between the two systems was considered statistically significant (p<0.05). Conclusion: RT Densell files have greater cutting ability than the files of the K3 brand rotary system, while the latter have.

Efficacy of Protaper Next Compared to Wave One in Intraradicular Dentin Wear in Flattened Root Canals

“…The technological advances have given rise to instruments with special metallic alloys, such as nickel-titanium, which allowed modifications in the cross-sectional design and cutting angle of the files. In addition, the tip design was changed, and the dimensions of the endodontic instruments were modified regarding conicity [13]. Mechanized instrumentation promotes faster preparation of the root canal and less stress for the professional and their patients during the treatment [14].…”

“…In view of this limitation, a technique was developed in which only one file of the Protaper Universal system, F2, was used in all root canal instrumentation based on reciprocating kinematics instead of continuous, in order to simplify the preparation steps and reduce the instrument fatigue [8]. From this proposal of intervention in root canals, several studies were conducted to compare the effectiveness of the continuous and reciprocating movements [1,10,13], emphasizing that the nickel and titanium instruments when used with reciprocating movements showed greater resistance, longer shelf life, greater ability to maintain canal centering, lower apical transport, and less extrusion of dentin remains in the periapex, compared to continuous instrumentation [2]. as more resistant to cyclic fatigue [16].…”