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The complete dentures are realized by different acrylic resins and different technologies. These materials are fragile and frequently appear crack and fractures of these dentures. Also, theses materials as well as the technologies of performing these dentures are expensive. In order to avoid the ultimate failure of the complete dentures, for each case there is necessary a numerical simulation as a preliminary stage before the effective performance of the denture. In order to realize the numerical simulation of the complete denture there is necessary to know the mechanical and elastic properties of the acrylic resins. This paper presents the results of experimental investigations performed in order to determine the mechanical and elastic properties of complete denture materials. A 3D laser scanner was used for the elaboration of the geometrical model of the complete dentures. In this way, using the reverse engineering technology there was realized a very accurate geometrical model. Finite element analysis was used to estimate the durability of the same complete dentures. The calculation model was finally validated by a fatigue experimental test.

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This paper presents the effect of saline environment on the fatigue behaviour of high-velocity oxygen fuel thermal-sprayed WC-CrC-Ni coatings. These coatings are used to improve the surface hardness, corrosion and wear resistance of components or products, in the place of hard chrome plating. Although so far many tests on the wear and corrosion of coating behaviour were carried, the conduct of the joint action fatiguea corrosive environment is not fully identified. In the frame of the experimental programme, similar axial fatigue tests at room temperature, on air or on specimens immersed in 3% NaCl solution and also chemical composition, structural analysis of the fracture surface were performed, using SEM and EDX. The saline environmentcauses material corrosion, generation of voids and microcracks on the specimen surface and their propagation through the specimen cross-section, accelerating the specimen failure.