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Volume 25 , Issue 5
September/October 2010

Pages 991–998

Influence of Artificial Aging on the Load-Bearing Capability of Straight or Angulated Zirconia Abutments in Implant/Tooth–Supported Fixed Partial Dentures

Frank P. Nothdurft, DDS, Dr Med Dent, Priv-Doz/Klaus E. Doppler, DDS/Kurt J. Erdelt, Dipl Ing, Dr Rer Biol Hum/Andreas W. Knauber, DT/Peter R. Pospiech, DDS, Dr Med Dent, Dr Med Dent Habil

PMID: 20862414

Purpose: The aim of the study was to evaluate the influence of artificial aging on the fracture behavior of straight and angulated zirconia implant abutments used in ZirDesign (Astra Tech) implant/tooth–supported fixed partial dentures (FPDs) in the maxilla. Materials and Methods: Four different test groups (n = 8) representing anterior implant/tooth–supported FPDs were prepared. Groups 1 and 2 simulated a clinical situation with an ideal implant position (maxillary left central incisor) from a prosthetic point of view, which allowed for the use of a straight, prefabricated zirconia abutment. Groups 3 and 4 simulated a situation with a compromised implant position that required an angulated (20-degree) abutment. OsseoSpeed implants (4.5 3 13 mm, Astra Tech) as well as metal tooth analogs (maxillary right lateral incisor) with simulated periodontal mobility were mounted in polymethyl methacrylate. The FPDs (chromium-cobalt alloy) were cemented with glass ionomer. Groups 2 and 4 were thermomechanically loaded and subjected to static loading until failure. Statistical analysis of force data at the fracture site was performed using nonparametric tests. Results: All samples survived thermomechanical loading. Artificial aging did not lead to a significant decrease in load-bearing capacity in either the straight abutments or the angulated abutments. The restorations that used angulated abutments exhibited higher fracture loads than the restorations with straight abutments (group 1: 209.13 ± 39.11 N; group 2: 233.63 ± 30.68 N; group 3: 324.62 ± 108.07 N; group 4: 361.75 ± 73.82 N). This difference in load-bearing performance was statistically significant, both with and without artificial aging. All abutment fractures occurred below the implant shoulder. Conclusions: Compensation for angulated implant positions with an angulated zirconia abutment is possible without reducing the load-bearing capacity of implant/tooth-supported anterior FPDs. Int J Oral Maxillofac Implants 2010;25:991–998

Key words: fatigue testing, fracture resistance, implant abutments, load-bearing capability, zirconia, zirconium dioxide

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