Bragger U, Karoussis, J, Persson R, et al

Materials and Methods: Patients for the prospective long-term case cohort study were recruited for a complete clinical and radiographic examination at 1 and 10 year intervals after implant placement. The sample size of this study was 89 patients with an age range of 28-88 years. The treatment plans for implant restoration utilized 3 restorative treatment plans: single crowns (SC); implant-implant fixed partial dentures (I-I FPDs); or implanttooth fixed partial dentures (I-T FPDs). Frameworks for I-I FPDs and I-T FPDs were constructed as 1 piece restorations without the use of precision attachments. During recall sessions, all incidences of biological and/or technical failures were noted and treated. At the 1 and 10 year examination intervals, complete periodontal and periimplant clinical and radiographic assessments were performed. The list of technical complications including: loosening of occlusal screws, fracture of occlusal screws, loss of retention, loosening of abutment screws, fracture of the abutment screws, fracture of the metal framework, fracture of the porcelain, and occlusal contact/ intrusion. Biological complications were defined as a probing pocket depth of 5 mm and bleeding on probing or suppuration around the fixture. For tooth abutments, caries a represented biological failure. The data were subjected to statistical analyses including one-way ANOVA and post hoc multiple comparisons of the frequencies of biological and technical complications among the 3 groups.