Interface and in bulk residual stress analysis in biomedical systems by non-destructive techniques

Bioceramic coatings on metallic implants are proposed to be a solution for combining the mechanical properties of the metal with the necessarily bioactive character of the ceramic layer, leading to a better integration of the entire implant.Residual strains, developed in a metal/ceramic system due to the processing route, were experimentally measured using non-destructive methods. In this work a specimen of an implant constituted by two biomedical ceramic/metal parts: (i) titanium dental like-implants and (ii) porcelain crown are presented. In particular the stress distributions are reported in: (i) a 50 μm hydroxyapatite coating deposited by plasma-spray technique on titanium alloy as well as (ii) a multilayer consisting of 1.8 mm glassy-ceramic and 0.35 mm opaque ceramic Porcelain-Fused to Metal on a 1.6 mm palladium substrate.

► We studied bioceramic coatings on metallic substrates as model for dental implants.
► For coating plasma-spray and Porcelain-Fused to Metal techniques were applied.
► Residual stress analysed by neutron, X-ray diffraction and synchrotron radiation.
► Precise and non-destructive evaluation made in core and at interface of materials.
► These techniques are complementary analysing different zones of the system.