| 3087 Retention Forces and Seating Discrepancies after Cementation of Implant-Supported Castings | ||
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M. HAGENMÜLLER, S. WOLFART, and M. KERN, University Hospital Schleswig-Holstein, Campus Kiel, School of Dentistry, Germany Objectives: The purpose of this in-vitro study was to evaluate retention forces and seating discrepancies after semipermanent fixation of castings on abutments of the Camlog implant system (Altatec) using 5 different cements. Methods: After sandblasting (50µm Al2O3, 2bars) castings (Degulor M, DeguDent) were seated (5N) on standard titanium abutments (diameter 4.3mm, height 6mm). The inner surface of the castings was either completely or half coated with cement. Abutments were used as delivered with a machined surface. In each group (n=8) castings were cemented in both ways (compl_ma; half_ma) with each of the following cements: 1. eugenol-free-zinc-oxide (Freegenol, GC), 2. zinc-phosphate (Harvard, Richter&Hoffmann), 3. glass-ionomer (KetacCem, 3M Espe), 4. polycarboxylate (Durelon, 3M Espe), 5. self-adhesive resin (RelyX Unicem, 3M Espe). Afterwards all castings and abutments were sandblasted (compl_sand) and again cemented with all cements. After storage in saline solution (37°C, 24h) tensile tests were conducted with a universal testing machine (Zwick-Z010). Marginal discrepancies were measured before and immediately after cementation using a light microscope. Statistical analysis was performed with the Kruskal-Wallis test, followed by pair-wise comparison with the Mann-Whitney test modified by Bonferroni-Holm. Results: The medians of the retention forces (N) for compl_ma were: F: 177, H: 346, K: 469, D: 813, R: 653. Three significantly (p£0.05) different groups could be identified (F, H/K, D/R). Retention forces did not differ comparing compl_ma and half_ma (p>0.05), but a significant increase was found for compl_sand in groups H (1183), K (1138), R (1205) (p£0.05), but not in groups F (70) and D (640). Seating discrepancies did not differ significantly between groups compl and half. Conclusions: The application mode of the cement did not influence retention and seating discrepancies. Due to the retention forces Freegenol seems suitable for provisional, Harvard and KetacCem for semipermanent, Durelon and RelyX Unicem for permanent fixation of implant-supported castings. | ||
| Seq #333 - Implant Prosthodontic Research 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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