Abstract: A dental implant attachment structure comprises an abutment member having a base end shaped for mating engagement with an upper coupling face of an implant member, the abutment member having a through bore and spaced inner and outer walls extending from its base end to form an internal chamber open at the opposite end of the member, a securing mechanism for extending through the bore to releasably secure the abutment member to an implant member, and an impression cap for releasably mounting on the open upper end of the abutment member to close the internal chamber. In one embodiment the securing mechanism comprises a single screw. The abutment member serves both as an impression transfer part for transferring the implant site to a laboratory cast, and also as part of the final laboratory manufactured restoration for installation at the implant site.