The invention is dental implant comprising a core and an external thread created on the outside surface of the core. The external thread is comprised of a main thread having a uniform pitch P that spirals upwardly around the core and a spiral ridge having a uniform pitch P located between adjacent turns of the main thread that spirals upward in parallel to the main thread. The distance between the outer edge of the core and the tip of the ridge is constant and the distance between the outer edge of the core and the tip of the main thread is reduced as the main thread winds its way from the bottom to the top of the implant. This results in the external thread having an effective pitch which varies from a value P at the bottom of the implant to P/2 at the top of the implant.
