This article presents the components and treatment protocol for the Astra Tech Single-Tooth Implant System, whose concept and designs has been tailored to the specific needs of single-tooth replacement. Since July 1991 the author has consecutively placed 39 single-tooth implants, of which 27 are restored and in function. To date there have been no recorded fixture failures, and the bone loss seen around fixtures in the first and subsequent years is insignificant. Two crowns have had to be replaced, and three were recemented over the follow-up period. All patients have expressed considerable satisfaction with their restorations from an esthetic perspect ive, and the system has been shown to avoid undesirable complications when employed in patients with normal masticatory function.