title: A long-term follow-up of 76 Bränemark single-tooth implants.
abstract: In a previous study (Haas et al. 1995), we reported on preliminary results of 76 Brånemark implants placed in 71 patients with single-tooth gaps. The present study examines the results of the same group over a longer period of time: 55 implants were followed for more than 5 years, 12 for a period between 4 and 5 years and 1 implant for 46 months. One patient died 3 years after implant placement. Five patients lost their implant within 24 months after insertion. The drop-out rate was 2 implants in 2 patients. The recall rate was thus 97%. Of the 5 implant failures, 2 were located in the maxilla and 3 in the mandible. The Kaplan-Meier survival probability was 93% after 120 months. 74% of the sites showed healthy peri-implant soft tissue conditions. At 15 implants (22%) a bone resorption of more than 2 mm was observed on intraoral radiographs. The mean bone resorption was 1.8 mm in the maxilla and 1.3 mm in the mandible and did not increase with time (Pearson correlation coefficient: r = -0.06, P = 0.59). Abutment loosening occurred in 7 implants (10%), however all abutments that were fixed with a defined torque subsequently remained stable. Thus the favourable preliminary results could be maintained over an average 66 months, indicating that if implant loss happens it seems to occur during the first 2 years after insertion.
authors: Department of Oral Surgery, Dental School, University of Vienna, Austria. robert.haas@univie.ac.at
authors: Robert
authors: R
authors: Haas
authors: Christian
authors: C
authors: Polak
authors: Rudolf
authors: R
authors: Fürhauser
authors: Georg
authors: G
authors: Mailath-Pokorny
authors: Orthun
authors: O
authors: Dörtbudak
authors: Georg
authors: G
authors: Watzek
mesh_terms: D000328:Adult; D000368:Aged; D001317:Austria; D001862:Bone Resorption / Q000145:classification; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth / Q000706:statistics & numerical data; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015993:Life Tables; D008137:Longitudinal Studies; D008297:Male; D008334:Mandible / Q000601:surgery; D008336:Mandibular Diseases / Q000145:classification; D008437:Maxilla / Q000601:surgery; D008439:Maxillary Diseases / Q000145:classification; D008875:Middle Aged; D010352:Patient Dropouts; D010512:Periodontal Index; D011336:Probability; D013223:Statistics as Topic; D016019:Survival Analysis; D019415:Torque