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 Session 2Chair: Chikahiro Ohkubo (Tsurumi University)


Influence of the Axial Surface of Keeper Coping on the Circumferential Tissue Using Three-Dimensional Finite Element


N. Shibuya1, D. Yamanaka1, T. Uchida1, T. Ohyama1,2, S. Nakabayashi1,2,S. Tadokoro1,H. Toyoma1,2, K. Ohtani1,2, T. Fujimoto1, M. Ishijima1 and T. Ishigami1,2

1Department of Partial Denture Prosthodontics, Nihon University School of Dentistry

2Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry


When a root cap is applied to the abutment teeth for an overdenture, the shape of the axial surface of the root cap may affect the stress distribution to the abutment teeth and the circumferential tissue. The aim of this study was to evaluate the influence of the axial surface shape of the root cap on the circumferential tissue and to analyze the biomechanical behavior of the tissue under the denture base. Three-dimensional finite element models of complete overdenture on the root cap delivered for a lower right canine was constructed. Three representive models of root caps changed the shape of axial surface were created. Muscle forces with definite direction and magnitude were exerted to simulate static bite clenching in left lateral occlusion.

As the analysis, significant differences in minimum principal stress for the surface of the cortical bone were found in the mesial neck of abutment teeth. Within the limitations of this study, it was suggested that the axial surface shape of the root cap affected the stress distribution on the cortical bone under the denture base.



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