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5 of implants) were mainly realized in pa- tients from the age group 18–60 years, predominantly in the posterior region. In the case of full prosthetics (25% of pa- tients, 47% of implants), either 2 (19%), 4 (57%) or 6 (10%) implants were in- serted in the anterior region and region of the primary molars. The remaining 14% of implants were integrated into existing full prosthetics. The patient group over 60 years was most frequently provided with full prosthetics (86%). Bridges were indicated in 10% of patients (11% of im- plants) and partial prosthetics in 2% of all patients (3% of implants). Whereas LOCATOR ® Abutments were used more or less exclusively for full and partial pros- thetics, titanium bases or universal abut- ments were largely used for single crowns and bridges. In part, CAD/CAM-fabricated abutments (DEDICAM) were also used for single crowns and full prostheses (Fig. 2) . The patients were examined over an obser- vation period of up to 23 months follow- ing implantation. Three quarters of the im- plants were functionally loaded for at least 6 months at the time of analysis. The mean time between load and the last follow-up was 9.2 ± 4.8 months. 4 early failures were registered during the rst 13 weeks after implantation. This resulted in a cumulative survival rate of 98% over the observation period. Complications occurred in a fur- ther 9 implants, six of which related to the prosthesis. Discussion/conclusion This retrospective analysis documents the use of the iSy Implant system and demon- strates that the concept works very suc- cessfully in the four standard indications with suf cient bone and tissue availabil- ity as well as adequate bone quality with transgingival healing. Both immediate implantations as well as immediate load- ing could be performed under favorable conditions. Effective preparation of the im- plant bed with the reduced drill sequence in all three bone types gives an indication of the good quality and good cutting per- formance of the single patient drills. The high survival rate of 98% is comparable to similar studies with transgingival heal- ing [1], with implants with tapered con- nections [3] or implants with Promote ® surfaces [2]. In summary, the iSy concept enables reliable and time-saving, and thus cost-saving, implant restorations in select- ed cases. [1] Esposito M, Grusovin MG, Chew YS, Coulthard P, Worthington HV: One-stage versus two-stage implant placement: A Cochrane systematic review of randomised controlled clinical trials: Eur J Oral Implantol 2009; Summer 2:91-99 [2] Nelson K, Semper W, Hildebrand D, Ozyuvaci H: A retrospective analysis of sandblasted, acid-etched implants with reduced healing times with an observation period of up to 5 years. Int J Oral Maxillofac Implants 2008; 23:726-732 [3] Schmitt CM, Nogueira-Filho G, Tenenbaum HC et al.: Performance of conical abutment (Morse Taper) connection implants: a systematic review. J Biomed Mater Res A 2014; 102:552-574 LITERATURE SCIENCE / CLINICAL RESEARCH Fig. 3 : Special reprint ZZI: www.camlog.de/sd-ulrici-zzi-2015 Fig. 2 : Type of abutment used for the various restorations: Most implants for full prostheses were restored with LOCATOR ® Abutments; the majority of single crowns were restored with titanium bases. Original publication in German and English: Ulrici S, Barth T, Klenke J, Wolf M: Retro- spektive Analyse von Patientenfällen mit iSy Implantaten in drei Zahnarztpraxen: Ein-Jahres Daten./ Retrospective analysis of cases treated with iSy implants in three dental practices: one-year follow-up. Z Zahnärztl Implantol 2015;31:282-294 DOI 10.3238/ZZI.2015.0282-0294