| 3295 Influence of cantilever forces on the deformation of Implant-Abutment Interface | ||
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R. APONTE-WESSON1, A. RANJITKAR2, P. BECK3, J. LEMONS3, M.S. MCCRAKEN3, and W. LACEFIELD3, 1University of Alabama at Birmingham, School of Dentistry, USA, 2University of Alabama, School of Dentistry, Birmingham, USA, 3University of Alabama at Birmingham, USA Identifying the functional and mechanical limitations of dental implant systems is essential for the long-term success of restorations. The occurrence of screw loosening and screw fracture has increased interest in different implant system abutments. Objectives: Cantilever force applied to the implant abutment on different types of commercially available dental implants was studied to determine the influence of joint design and material on the structural deformability of the systems. Methods:Two different endosteal designs were tested (internal connection: Osseotite Certain™ with a gold tite hexed screw, and external hex connection 3i® with gold plated square head screw) and16 donated specimens were tested in two groups of 8 specimens each, grouped depending on the type connection. The samples and their respective screw-retained interlocking single tooth abutments were tested in a bending mode (shear/cantilever forces) with the load applied perpendicular to the abutment at a fixed distance using an Instron universal test machine at a crosshead speed of 0.125 cm/second. Photographs were taken at 2X over load/time intervals to note the various stages of abutment joint interface opening. Each design was subjected to increasing magnitudes of force while observing and recording the magnitudes of abutment-to-implant joint opening. Groups were analyzed using ANOVA test, metallographic and Micro-vu sections were also analyzed post testing. Results: The mean in Newtons force (N±SD) required to open the implant-abutment joint was recorded as: 3i HL 393.2(±7.7), 3i IH 302.5(±43.5).The groups were significantly different (p<.0001). Conclusions: The force required to cause physical opening in the external hex system was comparatively more than that found to open the internal hex system. The opening was related to the design and loading condition. The internal hex system showed more elastic deformation than external systems. In both situations, the deformation-opening magnitudes were within the same range as found previously for other systems. | ||
| Seq #352 - Abutment-Implant Analysis 2:00 PM-4:00 PM, Saturday, 12 March 2005 Baltimore Convention Center Exhibit Hall E-F | ||
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