Implant Direct

n 1986, the internal Hex-Thread connection was first introduced in the Screw-Vent^® implant. The connection consists of a 1.5mm-deep internal hexagon with a threaded shaft below it to accommodate patented Friction-Fit™ abutments. At the top of the internal hexagon, a lead-in bevel further increases stability of the implant-abutment connection.

In comparison to the conventional external hexagon design, the internal hexagon-and-thread configuration substantially enhances the stability of the prosthetic abutment by increasing the surface contact with the hexagon of the mating abutment.

Placing the hexagon internally also allows the implant neck to be reduced in diameter, which eliminates the need to countersink in order to fully seat the implant. In 1992, the male hexagon of the mating abutment was tapered one degree to create frictional engagement with the internal hexagon of the implant, which has been shown to eliminate rotational variance between the components, a reported cause of screw loosening.