ABSTRACT
Three different designs of dowels prepared of stainless steel of the same size and dimensions [0.4 cm in diameter] with a flat circular head of diameter of 0.9 cm. The first design being smooth, the second having a vent passing from one side to the other, and the third of the threaded type. We used in this study a conventional chemically cured composite, and it was applied around the retentive area of each post to give the shape of a cylinder [1 cm length] by the help of special copper matrix. Cores were subjected to fatigue test using a device with half kg load at 50 cm height. The number of strokes required to fracture the composite core around each post was recorded. It was found that the composite core around the smooth posts showed maximal fatigue limit