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Volume 7 , Issue 4
Winter 1992

Pages 513-522

A Multicenter Study of Overdentures Supported by Brånemark Implants

Richard B. Johns, PhD, LDSRCS/Torsten Jemt, DDS, PhD/M. Robin Heath, PhD, BDS, FDSRCS/John E. Hutton, DDS, MS/Samuel McKenna, DDS, MD/David C. McNamara, BDSc, MDS, PhD/Daniel van Steenberghe, MD, PhD/Ross Taylor, BDS, MDS, MDSc/Roger M. Watson, BDS, MDS, FDSRCS/lrene Herrmann, DDS

PMID: 1299648

Nine clinical centers participated in a prospective study of overdentures supported by Brånemark implants in the maxilla or mandible. The study initially comprised 133 patients provided with 117 implants placed in the maxilla and 393 implants placed in the mandible. The preliminary results indicate a success rate in the mandible comparable with the reports on fixed prostheses. Conversely, overdenture treatment in the maxilla seems to be less favorable than previous reports of fixed restorations. The differences between the fixed and the present overdentures in the maxilla were mainly based on differences in patient selection and bone quality. A total of 32 implants was mobile and removed and another 29 implants were lost to follow-up because of patient dropout up to the first annual checkup after denture placement. A higher implant failure rate occurred in the maxilla. Mucosal reactions were also more unfavorable around implants placed in the maxilla. (INT J ORAL MAXILLOFAC IMPLANTS 1992;7:513—522.)

Key words: Brånemark implants, multicenter study, overdentures

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