Abstract: A fixation device at least partially implantable into tissue has a shaft having an outer face and a threaded portion wound around the outer face and forming a helical groove. At least a part of the threaded portion is implantable into tissue. The threaded portion includes a first face, a second face and a third face. The first face has a first end portion in curved contact with the outer face and a second end portion opposite the first end portion. The second face has a third end portion in curved contact with the outer face and a fourth end portion opposite the third end portion. The third face is coupled to the second end portion and the fourth end portion and is substantially parallel with the outer face.

Abstract: A fixation device at least partially implantable into tissue has a shaft having an outer face and a threaded portion wound around the outer face and forming a helical groove. At least a part of the threaded portion is implantable into tissue. The threaded portion includes a first face, a second face and a third face. The first face has a first end portion in curved contact with the outer face and a second end portion opposite the first end portion. The second face has a third end portion in curved contact with the outer face and a fourth end portion opposite the third end portion. The third face is coupled to the second end portion and the fourth end portion and is substantially parallel with the outer face.

Abstract: An engagement mechanism for dental prostheses that include supporting pins with headed terminations and implant and/or abutment members with cooperative sockets. A dental implant firmly mounted to a user's bone is provided at the distal end with a socket defining a cavity of cooperative dimensions to receive the headed termination. The headed termination is firmly kept in the cavity. In this manner, better utilization of the limited inter dental space is achieved. One way of securing the headed termination is by using a cementitious compound to bind the headed termination. Another way is to use an O-ring to secure the headed termination. The socket can be positioned directly in the distal end of an implant member or in an abutment.

Abstract: A device for supporting a dental prosthesis and to provide a rigid engagement to a dental implant or natural dentition while correcting the lack of parallelism of the latter. The device includes an implant abutment that has a spherical portion and an anchorage portion for rigidly mounting to the implant. A tubular engaging assembly supports the prosthesis and includes two ends. At least one of the ends has a diameter that is smaller than the diameter of the spherical portion and sufficiently large to house a substantial area of the spherical portion. A dental surgeon fills the tubular engaging assembly with cement and brings it in contact with the spherical portion. A protuberance with irregularities for enhancing the engagement is introduced in side the tubular engaging assembly. The latter can be positioned in site to correct any lack of parallelism of the implant.