Survival of NobelDirect implants: an analysis of 550 consecutively placed implants at 18 different clinical centers.

Tomas Albrektsson, Jan Gottlow, Luiz Meirelles, Per-Olov Ostman, Antonio Rocci, Lars Sennerby

Journal: Clinical implant dentistry and related research 2007;9(2):65-70

PMID: 17535329

Abstract

BACKGROUND

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.

PURPOSE

The aim of this study was to evaluate the failure rate of NobelDirect implants in a retrospective multicenter survey.

MATERIALS AND METHODS

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.

RESULTS

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.

CONCLUSIONS

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.

Address: Department of Biomaterials, Institute for Clinical Sciences, Sahlgrenska Academy, University of Göteborg, Göteborg, Sweden. [email protected]

DOI: 10.1111/j.1708-8208.2007.00054.x

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MeSH Terms: 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