A comparison of the shaping effects of 5 nickel-titanium rotary instruments in simulated S-shaped canals.
OBJECTIVE
The objective of this study was to compare the shaping efficacy of 5 Ni-Ti rotary instruments with different cross-sectional designs in simulated S-shaped resin root canals.


METHODS
One hundred canals (n = 20) were instrumented to apical size 0.04/25 with ProFile, K3, NiTi-TEE, EndoWave, or HeroShaper. Pre- and postoperative images were superimposed. Width of resin removal was measured. Total amount of material removal, amount and direction of transportation, and centering ratios were determined. Data were analyzed using 1-way ANOVA and post hoc Tukey and Newman-Keuls multiple comparison tests.


RESULTS
In terms of centering ratio and amount of transportation, ProFile followed by K3 gave the best results almost throughout the whole canal. However, ProFile created insufficient taper. Canals instrumented with the other 3 systems were transported and lacked flow.


CONCLUSIONS
The K3 system, probably owing to its cross-sectional design and sequence encompassing a high number of instruments, seems under the conditions of this study to be a better choice in preparing S-shaped simulated root canals.
Ersev
Handan
H
Department of Endodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey. ersev@istanbul.edu.tr
Yilmaz
Bülent
B
Ciftçioğlu
Elif
E
Ozkarsli
Sükrü Fatih
SF
D003722:Dental Alloys / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry*; D023861:Photography, Dental; D018915:Root Canal Preparation / Q000295:instrumentation*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium