In vitro testing of plasma-sprayed hydroxyapatite coatings
Hydroxyapatite-coated coupons were tested in various physiological media. Immersion in Ringer's solution showed that heat-treated coatings displayed a weight gain but the assprayed coatings underwent a weight loss. Dissolution of the coating was measured by weighing the specimen before and after ageing. Immersion of hydroxyapatite coatings showed the appearance of small spheres that were identified by X, ray diffraction as hydroxyapatite. Changes in coating morphology were detected and the coating degradation mechanisms are discussed. This paper thus looks at the morphology, composition, crystallinity and dissolution of hydroxyapatite coatings aged in Ringer's solution.
Now a day, more and more enterprises like PSA Peugeot Citroen need a new prototyping approach called virtual prototyping. The efficiency of virtual reality dedicated solutions is closely linked with the simulation and integration quality of different sensory feedbacks in a same system. Here, we present a new visuo-haptic configuration which preserves the performance factors of integrated sensory feedbacks. In addition, we propose a new haptic rendering method for rigid objects manipulation with surface properties (smooth, textures …) and without the well known undesirable effects from traditional methods (uncontrolled friction, sticking effects …). The configuration is evaluated with a first industrial concrete scenario. We also study a second visuo-haptic configuration using a video see-through head mounted display for blind manipulation applications. A second industrial scenario is presented