Numerical simulation and experimental verification of displacement distribution of the saddle of upper chrome-cobalt partial denture with separated kinematics
Journal Title: Prosthodontics - Year 2012, Vol 62, Issue 1
Abstract
Aim of the study. The experimentally verified assessment of numerical analysis of the displacement distribution – deflections clamping the saddle to the surface of soft tissues depending on the location and value of the load on the upper alar chrome-cobalt partial denture.Material and methods. The mechanical behaviour of the numerical projection was applied to an upper alar frame of removable partial denture with separated saddle kinematics, in which flexible deformation of the large connecting bar of the wing part was used with irregular distribution of support points and fixed mounting on abutment teeth. Discretisation of a thin metal frame coating in the system of flat triangular elements with a given density of nodes was performed by measuring points distributed on the plaster model of the surface with the application of the Protoskop software while working with the 3D digitizing system MicroScribeTM G2X (Immersion). To connect boundary conditions in the numerical projection of support, fitting and loading of clinical prosthesis with the measurements on the experimental prosthesis, a clockwise x, y, z cartesian coordinate system, oriented towards the occlusion plane in the SpeeCur 2.0 software, was assumed. Simulated occlusal loads with rising values from 1.96 N to 19.62 N were placed in a series on five saddle teeth, from a canine tooth to a second molar tooth, perpendicular to the occlusion plane analogically to the experimental measurements. For the numerical calculations of displacements with the finite element method in the Micro-STRAINS structural analysis system, material constants were assumed: the estimated actual elasticity module of the metal shell of the prosthesis 180 GPa with an averaged thickness of 0.45 mm from material research and Poisson’s ratio of 0.29 from the data provided by the alloy manufacturer WTX 11950 (CoCrMo).
Authors and Affiliations
Wojciech Michalski
Keywords
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