IADR Abstract Archives
Cyclic Fatigue Resistance of Different Nickel-Titanium Instruments in Artificial Canal
Objectives: The aim of this study was to evaluate the cyclic fatigue resistance of four nickel-titanium instruments in varied materials and different modes of rotary (continuous and reciprocating).
Methods: Forty nickel-titanium instruments were tested and divided into 4 experimental groups (n=10 each group): group 1 (Revo-S SU instruments); group 2 (ProTaper Next X2 instruments); group 3 (Reciproc R25 instruments); and group 4 (WaveOne Gold Primary instruments). Artificial canal was made of tempered stainless-steel to test the cyclic fatigue of these instruments. The instruments were inserted into the canal until the tip of the instrument reached to the terminus and then were statically rotated inside the canal according to the manufacturers’ parameters. The time from the beginning of rotation to the fracture of instrument was recorded. Rotated cycles of the instrument were calculated based on the round per minute (rpm) of each instrument. The detail facture was analysed under Scanning Electronic Microscope (SEM).
Results: There were statistically significant differences among experimental groups. The rotated cycles to fracture of WaveOne Gold Primary was highest, followed by that of Reciproc R25, ProTaper Next X2 and Revo-S SU respectively. Analysis of the fragments by SEM showed that the fracture of the instruments was the result of fatigue.
Conclusions: The cyclic fatigue resistance of the WaveOne Gold Primary single-file system was better than that of the Reciproc R25, ProTaper Next X2, and Revo-S SU instruments.
Methods: Forty nickel-titanium instruments were tested and divided into 4 experimental groups (n=10 each group): group 1 (Revo-S SU instruments); group 2 (ProTaper Next X2 instruments); group 3 (Reciproc R25 instruments); and group 4 (WaveOne Gold Primary instruments). Artificial canal was made of tempered stainless-steel to test the cyclic fatigue of these instruments. The instruments were inserted into the canal until the tip of the instrument reached to the terminus and then were statically rotated inside the canal according to the manufacturers’ parameters. The time from the beginning of rotation to the fracture of instrument was recorded. Rotated cycles of the instrument were calculated based on the round per minute (rpm) of each instrument. The detail facture was analysed under Scanning Electronic Microscope (SEM).
Results: There were statistically significant differences among experimental groups. The rotated cycles to fracture of WaveOne Gold Primary was highest, followed by that of Reciproc R25, ProTaper Next X2 and Revo-S SU respectively. Analysis of the fragments by SEM showed that the fracture of the instruments was the result of fatigue.
Conclusions: The cyclic fatigue resistance of the WaveOne Gold Primary single-file system was better than that of the Reciproc R25, ProTaper Next X2, and Revo-S SU instruments.