Showing results 1 to 20 of 46
  Influence de la vitesse de refroidissement sur le profil de contraintes résiduelles dans la céramique d’émaillage : mesures avec la méthode du trou incrémentalMAINJOT, Amélie  ; ; VAN HEUSDEN, Alain et alConference (2011, June 23) INTRODUCTION : La fabrication des couronnes et des bridges génère des contraintes résiduelles dans la céramique d’émaillage et dans l’infrastructure lors du procédé de refroidissement. Les contraintes ... [more ▼] INTRODUCTION : La fabrication des couronnes et des bridges génère des contraintes résiduelles dans la céramique d’émaillage et dans l’infrastructure lors du procédé de refroidissement. Les contraintes résiduelles sont un facteur important qui contrôle le comportement mécanique des restaurations. La connaissance de la distribution des contraintes en fonction de la profondeur peut aider à comprendre les échecs, particulièrement le chipping, qui est une problématique répandue avec les prothèses à infrastructure en zircone yttrium. L’objectif de cette étude est d’analyser la variation du profil de contraintes dans la céramique d’émaillage sur infrastructure métal ou zircone, en fonction de la vitesse de refroidissement. METHODES : La méthode du trou incrémental, souvent utilisée en ingénierie industrielle, a été adaptée à pour être utilisée au niveau de la céramique d’émaillage 1. Le profil de contraintes a été mesuré dans des des disques de 20 mm de diamètre, comprenant une infrastructure de 0.7 mm d’épaisseur en métal ou en zircone yttrium, et une couche de céramique d’émaillage de 1.5 mm d’épaisseur. Trois procédures de refroidissement différentes ont été étudiées. RESULTATS: Il a été observé que l’amplitude des contraintes mesurées en surface de la céramique d’émaillage augmente avec la vitesse de refroidissement, alors que l’amplitude des contraintes en profondeur diminue. Des contraintes en compression ont été mesurées à la surface de tous les échantillons. En profondeur, des contraintes en compression ont été mesurées au niveau des échantillons à infrastructure métal et des contraintes en traction au niveau des échantillons à infrastructure zircone. DISCUSSION ET CONCLUSIONS : La vitesse de refroidissement influence l’amplitude des contraintes résiduelles. Celles-ci peuvent influencer le comportement mécanique des bicouches à infrastructure métal et zircone. La nature du matériau d’infrastructure influence la nature des contraintes en profondeur, les échantillons zircone montrant un profil de contraintes beaucoup plus défavorable que les échantillons métal. L’hypothèse de la transformation de phase de la zircone est mise en avant pour expliquer ce comportement. REFERENCES : ¬¬¬¬¬¬¬1 Mainjot, A., et al. (2011) Dental Materials 27 : 437-444. Fig 1 Profil de contraintes dans l’émaillage des échantillons zircone. CC= Classic Cooling, MC= Modified Cooling, SC= Slow Cooling. [less ▲] Detailed reference viewed: 46 (6 ULg) A new method to measure residual stresses in veneering ceramicMainjot, Amélie ; Van Heusden, Alain ; Conference (2010, July 16) Detailed reference viewed: 21 (4 ULg)Développement d’une méthode de mesure des contraintes résiduelles présentes dans la céramique d’émaillage en prothèse conjointe céramo-métallique et tout céramiqueMainjot, Amélie ; Van Heusden, Alain ; Conference (2009, June 26) Detailed reference viewed: 26 (4 ULg) Adaptation des infrastructures unitaires en zircone sur piliers dentaires : comparaison d'un procédé CFAO avec un procédé de fabrication mécaniséeGrenade, Charlotte ; Mainjot, Amélie ; Van Heusden, Alain Conference (2009, June) Detailed reference viewed: 42 (7 ULg)Optimisation du comportement mécanique de la liaison zircone/céramique d’émaillage dans le cadre des prothèses dentaires et implantaires «tout céramiqueMainjot, Amélie ; Van Heusden, Alain ; Scientific conference (2009, January 23) Detailed reference viewed: 34 (4 ULg)Antibiotic prescribing in dental practice in Belgium.Mainjot, Amélie ; ; Van Heusden, Alain et alin International Endodontic Journal (2009), 42(12), 1112-7 AIM: To assess the types and frequency of antibiotic prescriptions by Belgian dentists, the indications for antibiotic prescription, and dentists' knowledge about recommended practice in antibiotic use ... [more ▼] AIM: To assess the types and frequency of antibiotic prescriptions by Belgian dentists, the indications for antibiotic prescription, and dentists' knowledge about recommended practice in antibiotic use. METHODOLOGY: In this cross-sectional survey, dental practitioners were asked to record information about all antibiotics prescribed to their patients during a 2-week period. The dental practitioners were also asked to complete a self-administered questionnaire regarding demographic data, prescribing practices, and knowledge about antibiotic use. A random sample of 268 Belgian dentists participated in the survey. RESULTS: During the 2-week period, 24 421 patient encounters were recorded; 1033 patients were prescribed an antibiotic (4.2%). The median number of prescriptions per dentist for the 2 weeks was 3. Broad spectrum antibiotics were most commonly prescribed: 82% of all prescriptions were for amoxycillin, amoxycillin-clavulanic acid and clindamycin. Antibiotics were often prescribed in the absence of fever (92.2%) and without any local treatment (54.2%). The most frequent diagnosis for which antibiotics were prescribed was periapical abscess (51.9%). Antibiotics were prescribed to 63.3% of patients with periapical abscess and 4.3% of patients with pulpitis. Patterns of prescriptions were confirmed by the data from the self-reported practice. CONCLUSIONS: Discrepancies between observed and recommended practice support the need for educational initiatives to promote rational use of antibiotics in dentistry in Belgium. [less ▲] Detailed reference viewed: 33 (3 ULg)Moderator : Prosthetic SessionVan Heusden, Alain Conference (2009) Detailed reference viewed: 4 (1 ULg)Clinical cases presentationVan Heusden, Alain Scientific conference (2008) Detailed reference viewed: 2 (0 ULg)Les principes généraux de la prothèse implantaireVan Heusden, Alain Scientific conference (2008) Detailed reference viewed: 9 (0 ULg)Esthetic implant rehabilitation with Procera zyrconia abutment and Procera alumina crownMoureau, Thomas ; Van Heusden, Alain Poster (2007) Detailed reference viewed: 7 (0 ULg)Fibrous mucosa preservation with NobelGuide; Van Heusden, Alain Poster (2007) Detailed reference viewed: 14 (0 ULg)Concave transmucosal profile at one-piece zirconia implants for improved esthetic results : a case reportRaepsaet, Nicolas ; Van Heusden, Alain Poster (2007) Detailed reference viewed: 14 (0 ULg)Les restaurations partielles collées postérieures en céramiqueMainjot, Amélie ; Van Heusden, Alain in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(2), 77-95 Posterior ceramic bonded partial restorations are conservative and esthetic approaches for compromised teeth. Overlays constitute a less invasive alternative for tooth tissues than crown preparations ... [more ▼] Posterior ceramic bonded partial restorations are conservative and esthetic approaches for compromised teeth. Overlays constitute a less invasive alternative for tooth tissues than crown preparations. With inlays and onlays they are also indicated in case of full arch or quadrant rehabilitations including several teeth. This article screens indications and realization of this type of restorations. [less ▲] Detailed reference viewed: 115 (13 ULg)Le collage-scellement des restaurations all-ceramVan Heusden, Alain ; Gueders, Audrey in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(2), 109-21 The objective of this article is to synthesize the current scientific data relating to the bonding of ceramic restorations in order to present a reliable and reproductive clinical method for the general ... [more ▼] The objective of this article is to synthesize the current scientific data relating to the bonding of ceramic restorations in order to present a reliable and reproductive clinical method for the general practitioner. The different ceramic treatments are explained with a distinction between those which can be etched and the others. A precise check list is suggested for the conditioning of dental tissues and ceramic surfaces. [less ▲] Detailed reference viewed: 91 (5 ULg)La céramique dentaire: son histoire et son développementMoureau, Thomas ; Van Heusden, Alain in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(1), 9-16 This article presents an historical background of dental ceramics. It synthesises the evolution of such material and its technical improvements from the stone-age to our time. Focusing on the importance ... [more ▼] This article presents an historical background of dental ceramics. It synthesises the evolution of such material and its technical improvements from the stone-age to our time. Focusing on the importance of dental aesthetics, it shows the investigations realised to upgrade the prosthetic results. [less ▲] Detailed reference viewed: 273 (3 ULg)Classification des céramiques selon la nature chimique et le procédé de mise en oeuvreMoureau, Thomas ; Bouhy, Alice ; Raepsaet, Nicolas et alin Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(1), 17-29 Nowadays, we find on the market a huge amount of design and manufactured system that allows the realisation of all-ceramics restorations, using different ceramics. The purpose of this article is ... [more ▼] Nowadays, we find on the market a huge amount of design and manufactured system that allows the realisation of all-ceramics restorations, using different ceramics. The purpose of this article is suggesting a classification of mostly used ceramics and a few laboratory process used in our university. [less ▲] Detailed reference viewed: 214 (9 ULg)Restaurations périphériques de type all-ceram: couronnes et bridgesLegros, Caroline ; Van Heusden, Alain in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(1), 30-46 Over the last years, current technologies in dental ceramics are strongly improved, constantly producing new materials for the restoration of the single or plural teeth. Feldspathic porcelains fused to a ... [more ▼] Over the last years, current technologies in dental ceramics are strongly improved, constantly producing new materials for the restoration of the single or plural teeth. Feldspathic porcelains fused to a cast metal substructure, the so-called "metal-ceramic crown," has been long time the gold standard; this is primarily due to their predictable long-term strength characteristics. All-ceramic systems are a focus of interest, because they offer aesthetic results that may be difficult to achieve with metal-ceramic systems. Nowadays, the new ceramics associate aesthetic and good mechanical qualities, biocompatibility, accurate marginal fit and low invasive preparations. Thanks to the diversification of all-ceram processes, materials properties and clinical situations are now the prime criteria which determine the practitioner's choice. In this article, we try to summarize different clinical concepts for peripheric all-ceram restoration, such as crowns and bridges used in a daily dental practice. [less ▲] Detailed reference viewed: 112 (11 ULg)Les facettes céramiques colléesChichoyan, Florence ; Van Heusden, Alain in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(1), 47-64 Nowadays the porcelain laminate veneer is a frequently prescribed aesthetic restoration for anterior teeth. A substantially reduced tooth preparation is required compared to conventional aesthetic ... [more ▼] Nowadays the porcelain laminate veneer is a frequently prescribed aesthetic restoration for anterior teeth. A substantially reduced tooth preparation is required compared to conventional aesthetic complete crown preparations, in accord with the practice philosophy of minimally invasive dentistry. The long term clinical success of porcelain veneers depends on a careful case selection and diagnostic approach, as well as accurate and appropriate tooth preparation and adhesive bonding procedures. The goal of this paper is to give a reproducible clinical method to the practitioner for the realization of reliable porcelain laminate veneers. [less ▲] Detailed reference viewed: 151 (3 ULg)Provisional solutions for natural teeth and implants.Van Heusden, Alain Conference (2006) Detailed reference viewed: 1 (0 ULg)Principes généraux de la prothèse implantaireVan Heusden, Alain Conference (2006) Detailed reference viewed: 5 (0 ULg) |
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