Shaping ability of two M-wire and two traditional nickel-titanium instrumentation systems in S-shaped resin canals.
OBJECTIVE
The aim of this study was to evaluate the shaping effects of two M-wire and two traditional nickel-titanium (NiTi) rotary systems in simulated S-shaped resin canals.


METHODS
Forty simulated S-shaped canals in resin blocks were instrumented with two traditional (ProTaper, Sendoline S5) and two M-wire (WaveOne, GT series X) NiTi systems according to the manufacturers' instructions. Ten resin blocks were used for each system. Pre- and post-instrumentation images were captured using a stereomicroscope and superimposed with an image program. Canal transportation, material removal, and aberrations were evaluated and recorded as numeric parameters.


METHODS
Data were analyzed using one-way ANOVA and post-hoc Tukey tests with a 95% confidence interval.


RESULTS
There were significant differences between systems in terms of transportation and material removal (P<0.05). Coronal danger zone was the most common aberration.


CONCLUSIONS
Within the limits of this ex vivo study, it was found that the manufacturing methods (M-wire or traditional NiTi) and kinematics (rotary or reciprocating motion) did not affect the shaping abilities of the systems. The extended file designs of highly tapered NiTi systems (ProTaper, WaveOne) resulted in greater deviations from the original root canal trace and more material removal when compared to less tapered systems (Sendoline S5, GT series X).
Department of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
K T
KT
Ceyhanli
A
A
Kamaci
M
M
Taner
N
N
Erdilek
D
D
Celik
D003762:Dental Instruments; D003786:Dental Pulp Cavity; D006801:Humans; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D012390:Root Canal Therapy / Q000379:methods*; D014025:Titanium
C040654:titanium nickelide; D009532:Nickel; D014025:Titanium