title: Impact of Dynamic Loading on the Implant-abutment Interface Using a Gas-enhanced Permeation Test In Vitro.
abstract: To assess implant leakage under static conditions as well as during and after dynamic loading. Materials and methods : Implants (Astra Tech (A), Biomet 3i (B) and Nobel Biocare (C)) were evaluated for leakage (n=8/group). Testing to assess the gas pressure change over time (hPa/min) and infiltrated fluid volume, was performed in a Gas Enhanced Permeation Test (GEPT) to qualify embedding. Implant apexes were then drilled, abutments were mounted and resin build-ups were fabricated. GEPT was reassessed. Samples were afterward mounted in a computer-controlled masticator while tested to bacterial leakage, they were daily observed for turbidity. Samples were then reassessed using GEPT. Dunnett's and Fisher's exact tests were utilized to compare implant and to analyze bacterial leakage. Results : Significant differences in GEPT values were shown after loading (p=0.034). Leakage resistance was best for B when compared to C (p=0.023). Samples with higher GEPT values demonstrated earlier bacterial leakage, occurring after 1 or 2 days (A=4, B=0, C=6) and showing favorability for implant system B (p=0.009). Conclusion : Implants leaking under static conditions had increased potential for bacterial leakage under dynamic conditions. As strongly correlating to sophisticated analytical methods, GEPT is a promising technique for assessing the overall implant system leakage resistance.
authors: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plat-tenstrasse 11, 8032 Zürich, Switzerland.
authors: Anas
authors: A
authors: Al-Jadaa
authors: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plat-tenstrasse 11, 8032 Zürich, Switzerland.
authors: Thomas
authors: T
authors: Attin
authors: Oral and Maxillofacial Unit, Tampere University Hospital. Tampere, Finland.
authors: Timo
authors: T
authors: Peltomäki
authors: Department of Statistics, University of Munich, Munich, Germany.
authors: Christian
authors: C
authors: Heumann
authors: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plat-tenstrasse 11, 8032 Zürich, Switzerland.
authors: Patrick Roger
authors: PR
authors: Schmidlin
keywords: Dynamic loading; implants leakage; static implants leakage