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 instrum ented 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. Desc riptive 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 r otary 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 sta tistically 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.
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