152 T here are numerous prosthetic techniques for sin- gle-tooth replacement, but their effectiveness is subject to certain important considerations. Removable dentures frequently are not well tolerated either by the patients or by their tissues, whereas fixed dentures involve impairing the integrity of the dental tissue with the accompanying risk of pulp damage. Finally the *Private Practice, Periodontics and Implantology, Perugia, Italy; † Private Practice, Periodontics and Implantology, Palermo, Italy; ‡ Private Practice, Periodontics and Implantology, Rome, Italy; § Pri- vate Practice, Periodontics and Implantology, Firenze, Italy; ¶ Private Practice, Periodontics and Implantology, Verona, Italy; # Private Practice, Prosthodontics and Implantology, Verona, Italy; **Nobel Biocare AB, Gothenburg, Sweden Reprint requests: Giuseppe Luongo, MD, DDS, Viale Giulio Cesare 47, 00192 Rome, Italy; e-mail: g.luongo@iol.it © 2000 B.C. Decker Inc. ABSTRACT Background: Implant restorations first started with total edentulism. Later, the scientific community gave its approval for restorations in partial edentulism, and only recently some studies confirmed the validity of the treatment for single- tooth replacement. Purpose: The purpose of the study was to evaluate implant survival and prosthesis stability of Brånemark implants (tita- nium screws) when used routinely for single-tooth replacement in all regions. Materials and Methods: Two hundred and fourteen patients received 252 implants for single-tooth replacement over a period of 8 years at five private clinics in Italy. The patients were treated in accordance with the protocol for Brånemark implants, and the data gathered have been analyzed according to established evaluation methods. Results: During the observation period, 10 failures were recorded and 229 restorations were carried out. After the first year of loading, the total cumulative survival rate (CSR) was 96%, which then remained stable over the study time. The most frequent complication was loosening of the abutment screws (n = 22), amounting to 35% of all of the complications. This problem was related mainly to earlier types of abutments, whereas the more recent design, CeraOne abutment, showed a low frequency of screw loosening. Conclusions: The high survival rate, which is similar to that presented for prospective multicenter studies for single- tooth restorations with Brånemark implants, led to the conclusion that the use of this treatment modality is a reliable treatment for routine use in all oral regions. KEY WORDS: Brånemark System, dental implants, retrospective clinical study, screw-joint stability, single-tooth implant Osseointegrated Implant for Single-Tooth Replacement: A Retrospective Multicenter Study on Routine Use in Private Practice Giuseppe Bianco, MD, DDS;* Rosario Di Raimondo, MD, DDS; † Giuseppe Luongo, MD, DDS; ‡ Cesare Paoleschi, DDS; § Paolo Piccoli, MD, DDS; ¶ Carlo Piccoli, MD, DDS; # Bo Rangert, Mech Eng, PhD** extremely variable survival rates for bonded prostheses make their use inadvisable as a permanent prosthesis. 1 A new modality for single-tooth restoration, osseo- integrated implants ad modum Brånemark, has evolved as a viable alternative during the past decade. 2–13 Two of these studies are prospective multicenter investiga- tions, 12,13 showing 5-year success rates of 98 to 99%. Other implants that have been developed for this indica- tion, with results presented in the literature, are ITI (Straumann AG, Waldenburg, Switzerland) and Astra Tech (Astra Tech AB, Mölndal, Sweden). 14–18 These studies demonstrate favorable outcomes in the 2- to 3- year perspective. In all but one of the studies reviewed, complications related to prosthesis stability are reported. The documentation of Brånemark implants for sin- gle-tooth restorations is presented by teams with exten- sive experience with osseointegrated implants, and most