Abstract
The purpose of this study was to compare the fracture resistance of two different rotary Ni Ti instrument systems due to cyclic fatigue. The instruments compared were RaCe (FKG, La- Chaux De Fonds, Switzerland) and a new rotary system - Varitaper (Endomax, Equinox, Holland). The cyclic fatigue testing was conducted with the instrument rotating freely at two different angles of curvature 45Ú & 90Ú with maximum curvature at 5mm from the tip. Total 60 instruments were tested in the two groups for both angles of curvature. The instruments were rotated at 350 rpm using the ATR motor (Dentsply, Maillefer) set at maximum torque, until fracture occurred. The time until fracture was recorded in seconds by using a stopwatch, and the number of rotations to fracture was then calculated and results were statistically analyzed. RaCe (FKG, La- Chaux De Fonds, Switzerland) performed significantly better than Varitaper (Endomax, Equinox, Holland) in cyclic fatigue testing.
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