Effect of different torques in cyclic fatigue resistance of K3 rotary instruments
Braz. j. oral sci
; 14(2): 122-125, Apr.-June 2015. tab, ilus
Article
in English
| LILACS
| ID: lil-755042
Responsible library:
BR218.1
ABSTRACT
Aim:
To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickel-titanium (NiTi) files.Methods:
Eighty K3 files, size 25 mm, taper 0.04 were divided in 4 groups according to different torques (0.5, 1, 2 and 6 Ncm) and were submitted to a cyclic fatigue test. This test was performed with a device that allowed the file to rotate inside a stainless steel artificial curved canal, simulating the pecking motion. Files rotated until fracture occurred and time to failure was recorded in seconds with a stopwatch. Data were analyzed by ANOVA and Tukey tests (p<0.05).Results:
All groups were compared and only the group of 6 N.cm showed statistically significant difference (p=0.0002).Conclusions:
For #25.04 K3 files, the evaluated torques up to 2 N.cm had no influence on cyclic fatigue resistance. Using 6 N.cm torque value resulted in lower resistance to cyclic fatigue.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Root Canal Preparation
/
Torque
/
Dental Instruments
/
Endodontics
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2015
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Santa Cecília/BR
/
Universidade de São Paulo/BR