Shaping ability of four nickel-titanium rotary instruments in simulated S-shaped canals.
BACKGROUND
The purpose of this study was to compare the shaping ability of ProTaper, Mtwo, BioRaCe, and BioRaCe + S-Apex instruments in simulated canals with an S-shaped curvature.


METHODS
Canal transportation and aberrations were assessed by comparing the preinstrumentation and postinstrumentation images under a stereomicroscope. Analysis of variance and post hoc Student-Newman-Keuls test were used for statistical analysis.


RESULTS
ProTaper instruments caused more pronounced canal transportation in the apical curvature (P < .01) than all other instruments. The use of ProTaper, Mtwo, and BioRaCe instruments resulted in more canal aberrations compared with BioRaCe + S-Apex (P < .05).


CONCLUSIONS
NiTi systems including less tapered and more flexible instruments like S-Apex seem to be favorable when preparing S-shaped canals.
Bonaccorso
Antonio
A
endomaterials@fastwebnet.it
Cantatore
Giuseppe
G
Condorelli
Guglielmo Guido
GG
Schäfer
Edgar
E
Tripi
Teresa Roberta
TR
D003722:Dental Alloys; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D004868:Equipment Failure; D006801:Humans; D003765:Models, Dental; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D014025:Titanium; D019227:Tooth Apex / Q000033:anatomy & histology
D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium