silicon and Mandibular-Diseases

A recently introduced implant, the NobelDirect (Nobel Biocare AB, Göteborg, Sweden), has previously been documented with substantial bone resorption in a large number of operated cases.. The aim of this study was to evaluate the failure rate of NobelDirect implants in a retrospective multicenter survey.. A total of 550 NobelDirect implants consecutively placed in over 269 patients at 18 centers were evaluated with regard to failure rate after an average follow-up of about 1 year.. The overall failure percentage was 10.9% (59 failures). The 58 implants not loaded directly showed only one failure (1.7%) versus 58 failures (11.8%) of those implants that were loaded directly. A chemical x-ray photoelectron spectroscopy analysis of an implant from the original batch showed up to 3.5% silicon at parts of the implants. A retrieval analysis of one implant removed at 2 years after placement demonstrated bone resorption down to the level of the fifth thread.. It is concluded that the NobelDirect implant, if placed with a punch procedure, ground down in situ, and loaded directly, shows an unusually high failure rate at 1 year.

Topics: Aged; Alveolar Bone Loss; Connective Tissue; Dental Abutments; Dental Implantation, Endosseous; Dental Implants; Dental Restoration Failure; Electron Probe Microanalysis; Female; Follow-Up Studies; Humans; Mandibular Diseases; Microscopy, Electron, Scanning; Nitrogen; Phosphorus; Retrospective Studies; Silicon; Suppuration; Surface Properties; Survival Analysis