Abstract: To prevent loosening of screw joints for dental implant component stacks, a spring washer is placed directly beneath the head of a gold screw in a circular channel of a gold cylinder. Other joints such as between the gold cylinder and its abutment and between the abutment and the fixture can also be equipped with spring washers.

Abstract: An intramobile element for dental implants that includes an elastic, flat, circular washer having rounded edges, being 0.75 mm in height and designed to fit neatly on existing abutments and a prosthesis that comprises a gold member to which a porcelain cover is cast. The gold member has a cylindrical head with an internal cradle to precisely support a gold retaining screw with a rounded head and a screw channel spaced from the screw threads to allow for rotation of the prosthesis and making use of existing specific length abutments to control placement of the washer either supragingivally for hygienic reasons or supragingivally for esthetic reasons.