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Vittecoq Eric

Adjoint scientifique HES

Hauptkompetenzen

Adjoint scientifique HES

Büro: A202

Haute école du paysage, d'ingénierie et d'architecture de Genève
Rue de la Prairie 4, 1202 Genève, CH

Bereich
Technique et IT

Hauptstudiengang
Génie mécanique

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Laufend

Humerus Clausus

Rolle: Partner/in

Financement: InterReg

Description du projet :

Le projet « Humerus Clausus » a comme objectif de développement d’outils d’aide au diagnostic, à la simulation et au traitement des pathologies de l’épaule par un traitement numérique individualisé. Un dispositif de mesure non invasif sera mis au point afin d’identifier en temps réel la position des structures osseuses impliquées dans l’articulation scapulo-humérale (épaule). Parallèlement, un banc de test utilisable sur pièces anatomiques permettra de relier expérimentalement un mouvement donné de l’humérus aux efforts musculaires correspondants. Cet ensemble permettra l’optimisation, en chirurgie virtuelle, du choix de l’ensemble prothétique afin de maximiser les amplitudes et donc le résultat fonctionnel. La complémentarité des partenaires industriels, universitaire et médicaux (panel de 5 Chirurgiens orthopédistes) dans des domaines très variés tels que la traumatologie, le traitement d’images, les dispositifs accélérométriques et magnétométriques, la simulation numériques musculo-squelettique, la conception de banc destinée à une utilisation en laboratoire d’anatomie, les certifications européennes ainsi que la connaissance par chacun des acteurs des spécificités de l’épaule devrait permettre de concevoir, valider et faire certifier ces systèmes destinés à l’orthopédie, contribuant ainsi à l’amélioration du service médical rendu.

Forschungsteam innerhalb von HES-SO: Vittecoq Eric

Partenaires académiques: Vacher Pierre, Université Savoie Mont Blanc; Armand Stéphane, UNIGE

Partenaires professionnels: Alepee Christophe, One Ortho Medical, St Etienne, F; Benoît Mariani, Gait Up, Lausanne, CH

Durée du projet: 01.11.2019 - 28.08.2026

Montant global du projet: 1'804'590 CHF

Statut: Laufend

Abgeschlossen

CloThilde

Rolle: Mitgesuchsteller/in

Financement: InterReg

Description du projet :

Conception d'une gamme implant-prothèse pour traiter les fractures de l'humérus proximal

Forschungsteam innerhalb von HES-SO: Vittecoq Eric

Partenaires académiques: Vacher Pierre, Université Savoie Mont Blanc

Partenaires professionnels: Alepee Christophe, One Ortho Medical, St Etienne, F; Bonjour Christian, ChriMat, Monthey, CH

Durée du projet: 02.11.2015 - 28.02.2019

Montant global du projet: 1'482'465 CHF

Statut: Abgeschlossen

2019

Translational research on clinically failed zirconia implants

Scientifique ArODES

Scherrer Susanne S., Mekki Mustapha, Crottaz Claude, Gahlert Michael, Romelli Eric, Marger Laurine, Durual Stéphane, Vittecoq Eric

Dental Materials, 2019, vol. 35, pp. 368-388

Link zur Publikation

Zusammenfassung:

Objectives: To provide fractographic analysis of clinically fractured zirconia implants recovered with their cemented crown. To calculate bending moments, corresponding stress and crack onset location on the implant’s fracture surface using a mathematical model integrating spatial coordinates of the crown-implant part and occlusal loading obtained from 2D and 3D images. Methods: 15 fractured zirconia implants parts (11 posterior and 4 anterior) with their all- ceramic crowns still cemented on it were recovered. The implants were first generations from four manufacturers (AXIS Biodental, Z-Systems, Straumann, Swiss Dental Solutions). The time-to-failure varied between 2 weeks and 9 years. Fractography was performed identifying the failure origin and characteristic surface crack features. From 2D and 3D digital images of the crown-implant part, spatial coordinates anchoring the crown’s occlusal contacts with the implant’s central axis and reference plane were integrated in a mathematical model spreadsheet. Loads of 500 N in total were selectively distributed over identified occlusal contacts from wear patterns. The resultant bending and torsion moments, corresponding shear, tensile, maximum principal stress and von Mises stress were calculated. The fracture crack onset location on the implant’s fracture surface was given by an angular position with respect to an occlusal reference and compared with the location of the fracture origin identified from fractographic analysis. Results: Implants fractured from the periphery of the smaller inner diameter between two threads at the bone-entrance level except for one implant which failed half-way within the bone. The porous coating (AXIS Biodental) and the large grit alumina sandblasting (Z-System) created surface defects directly related to the fracture origin. The model spreadsheet showed how occlusal loading with respect to the implant’s central axis affects bending moments and crack onset. Dominant loads distributed on contacts with important wear pattern provided a calculated crack onset location in good agreement with the fractographic findings of the fracture origin. Significance Recovered broken zirconia implant parts with their restorative crowns can provide not only information regarding the failure origin using fractography but also knowledge regarding occlusal crown loading with respect to the implant’s axis. The mathematical model was helpful in showing how occlusal loading affects the location of the fracture initiation site on clinical zirconia implant fracture cases.

2007

Fatigue behaviour of an arc welded Al–Si–Mg Alloy

Scientifique ArODES

Geoffroy N., Vittecoq Eric, Birr Alexandre, De Mestral François, Martin Jean-Michel

Scripta Materialia, 2007, vol. 57, no. 4, pp. 349-352

Link zur Publikation

Zusammenfassung:

The mechanical and fatigue properties of T-shaped samples made out of Al–Si–Mg aluminium plates assembled using metal inert gas welding were investigated. Samples with standard quality welds were fatigue tested until failure and analysed using the plastic hinge model. The importance of welding residual stresses on the fatigue life was shown. Samples with poor quality welds were also fatigue tested and compared with standard samples. The results showed that poor quality welds tremendously reduce the fatigue life of assemblies.

2009

Surface and mechanical properties of laser melted maraging steel

Conference ArODES

Eric Vittecoq, Marc Jobin, Raphael Foschia

Proceedings of EuroPM 2009, 12-14 October 2009, Coppenhagen, Denmark

Link zur Konferenz

Zusammenfassung:

In order to drastically reduce the cycle and cost production of engine parts in the transport industry, we have developed laser powder melting processes to produce several key engine parts in maraging steel, Co-Cr and Inconel 718. Results presented here concerns maraging steel only. Laser melted samples were polished with three different treatments: Abrasive Flow Machining (from Extrudehone), Vibratory finishing (from Rosler) and MMP (Micro Machining Process from BESTinCLASS). The dimensional tolerance after polishing was 5µm. The resulting surface topographies were measured with Stylus Profilometry and Atomic Force Microscopy. The MMP process allows reducing the rms roughness (Rq) to 12 nm only for a 20µm x 20µm field of view. In order to investigate the surface treatments in terms of what characteristic length (i.e spatial frequency) have been filtered, we present the results with the help of power spectral density. Concerning the mechanical properties, the anisotropy of fatigue and tensile strength is not significant as a consequence of the direct melting process compared to sintering.

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Vittecoq Eric

Adjoint scientifique HES

Hauptkompetenzen

Calcul de sructure

CAO

Essais mécanique

Adjoint scientifique HES