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Evaluation of resistance to cyclic fatigue of rotary and reciprocal systems

Grant number: 12/00380-5
Support type:Regular Research Grants
Duration: April 01, 2012 - March 31, 2013
Field of knowledge:Health Sciences - Dentistry - Endodontics
Principal Investigator:Idomeo Bonetti Filho
Grantee:Idomeo Bonetti Filho
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


The study aimed to evaluate the effect of displacement speed in cyclic fatique resistance of nickel-titanium instruments submitted to dynamic flexion test, and the resistance of the instruments using different kinematics (reciprocal and rotational) of the instruments tested. Will be evaluate thirty instruments of the follow systems: Recripoc® system (VDW), Wave One® (Dentsply-Maillefer), ProTaper Universal® (Dentsply-Maillefer) and MTwo® (VDW), they were, respectively, the instruments R25, Primary File 25, F2 and 25.6 of the mentioned systems, divided into two groups, containing fifteen files of each system per group. All instruments will be subjected to bending test using a device designed specifically for the study. The test apparatus consists of an artificial canal curved, made of hardened stainless steel and features 5 mm radius of curvature and angle of 45°. The electric motors Silver Reciproc® (VDW), Wave One® (Dentsply-Maillefer), VDW Silver® (VDW) and X-Smart® (Dentsply-Maillefer) will be used in this study. In the handpieces from these engines will be coupled the instruments of the systems Reciproc®, Wave One®, MTwo® and ProTaper Universal®, which will be introduced in the artificial channel and there will be moved freely until their fracture. The device will regulate the speed of axial displacement of the artificial channel for forward and backward in the direction of the instruments, simulating the input and output in the root canal. Will use a displacement speed of the simulated canal, and the instruments of Group I, will undergo a displacement speed of 146 displacements per minute and, in Group II, the instruments will not submitted to axial displacement of the simulated canal. The time to fracture will be recorded by a stopwatch and, thereafter, shall be calculated the number of rotations to fracture. The comparison of the average number of cycles to fracture will be subjected to statistical analysis. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
LUCAS-OLIVEIRA, EVERTON; ARAUJO-FERREIRA, ARTHUR G.; TREVIZAN, WILLIAN A.; COUTINHO DOS SANTOS, BERNARDO C.; BONAGAMBA, TITO J. Sandstone surface relaxivity determined by NMR T-2 distribution and digital rock simulation for permeability evaluation. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, v. 193, OCT 2020. Web of Science Citations: 0.
MONTRAZI, ELTON TADEU; MONARETTO, TATIANA; BONAGAMBA, TITO JOSE; COLNAGO, LUIZ ALBERTO. New and rapid pulse sequences for two-dimensional D-T-1 correlation measurements. JOURNAL OF MAGNETIC RESONANCE, v. 315, JUN 2020. Web of Science Citations: 0.
MONTRAZI, E. T.; BONAGAMBA, T. J. Direct NMR T-1 distribution measurement without using ill-posed fitting methods. JOURNAL OF MAGNETIC RESONANCE, v. 309, DEC 2019. Web of Science Citations: 1.
MONTRAZI, E. T.; BONAGAMBA, T. J. Saturation-recovery as a T-1-filter for T-2-T-2 exchange NMR. JOURNAL OF MAGNETIC RESONANCE, v. 301, p. 67-72, APR 2019. Web of Science Citations: 1.

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