References of "Mainjot, Amélie"
     in
Bookmark and Share    
See detailLe point sur l'émaillage de la zircone: aspects cliniques et scientifiques
MAINJOT, Amélie ULg

Conference (2013, January 25)

Detailed reference viewed: 23 (2 ULg)
Full Text
Peer Reviewed
See detailClinical risk factors related to failures with zirconia-based restorations: An up to 9-year retrospective study.
KOENIG, Vinciane ULg; Vanheusden, Alain ULg; Le Goff, Stephane O. et al

in Journal of dentistry (2013), 41(12), 1164-74

OBJECTIVES: The first objective of this study was to retrospectively evaluate zirconia-based restorations (ZBR). The second was to correlate failures with clinical parameters and to identify and to ... [more ▼]

OBJECTIVES: The first objective of this study was to retrospectively evaluate zirconia-based restorations (ZBR). The second was to correlate failures with clinical parameters and to identify and to analyse chipping failures using fractographic analysis. METHODS: 147 ZBR (tooth- and implant-supported crowns and fixed partial dentures (FPDs)) were evaluated after a mean observation period of 41.5+/-31.8 months. Accessorily, zirconia implant abutments (n=46) were also observed. The technical (USPHS criteria) and the biological outcomes of the ZBR were evaluated. Occlusal risk factors were examined: occlusal relationships, parafunctional habits, and the presence of occlusal nightguard. SEM fractographic analysis was performed using the intra-oral replica technique. RESULTS: The survival rate of crowns and FPDs was 93.2%, the success rate was 81.63% and the 9-year Kaplan-Meier estimated success rate was 52.66%. The chipping rate was 15% and the framework fracture rate was 2.7%. Most fractographic analyses revealed that veneer fractures originated from occlusal surface roughness. Several parameters were shown to significantly influence veneer fracture: the absence of occlusal nightguard (p=0.0048), the presence of a ceramic restoration as an antagonist (p=0.013), the presence of parafunctional activity (p=0.018), and the presence of implants as support (p=0.026). The implant abutments success rate was 100%. CONCLUSIONS: The results of the present study confirm that chipping is the first cause of ZBR failure. They also underline the importance of clinical parameters in regards to the explanation of this complex problem. This issue should be considered in future prospective clinical studies. CLINICAL SIGNIFICANCE: Practitioners can reduce chipping failures by taking into account several risk parameters, such as the presence of a ceramic restoration as an antagonist, the presence of parafunctional activity and the presence of implants as support. The use of an occlusal nightguard can also decrease failure rate. [less ▲]

Detailed reference viewed: 77 (13 ULg)
Full Text
Peer Reviewed
See detail3D-Characterization of the veneer-zirconia interface using FIB nano-tomography.
MAINJOT, Amélie ULg; Douillard, Thierry; Gremillard, Laurent et al

in Dental materials : official publication of the Academy of Dental Materials (2013), 29(2), 157-65

OBJECTIVES: The phenomena occurring during zirconia frameworks veneering process are not yet fully understood. In particular the study of zirconia behavior at the interface with the veneer remains a ... [more ▼]

OBJECTIVES: The phenomena occurring during zirconia frameworks veneering process are not yet fully understood. In particular the study of zirconia behavior at the interface with the veneer remains a challenge. However this interface has been reported to act on residual stress in the veneering ceramic, which plays a significant role in clinical failures such as chipping. The objective of this study was thus to investigate the veneer-zirconia interface using a recent 3D-analysis tool and to confront these observations to residual stress measurements in the veneering ceramic. METHODS: Two cross-sectioned bilayered disc samples (veneer on zirconia), exhibiting different residual stress profiles in the veneering ceramic, were investigated using 2D and 3D imaging (respectively Scanning Electron Microscopy (SEM) and Focused Ion Beam nanotomography (FIB-nt), associated with chemical analysis by Energy Dispersive X-ray Spectroscopy (EDS). RESULTS: The observations did not reveal any structural change in the bulk of zirconia layer of both samples. However the presence of structural alterations and sub-surface microcracks were highlighted in the first micrometer of zirconia surface, exclusively for the sample exhibiting interior tensile stress in the veneering ceramic. No interdiffusion phenomena were observed. SIGNIFICANCE: FIB nanotomography was proven to be a powerful technique to study the veneer-zirconia interface. The determination of the origin and the nature of zirconia alterations need to be further studied. The results of the present study support the hypothesis that zirconia surface property changes could be involved in the development of tensile stress in the veneering ceramic, increasing the risk of chipping. [less ▲]

Detailed reference viewed: 47 (1 ULg)
See detailWhat future for zirconia in prosthodontics : state of the art and research outcomes
MAINJOT, Amélie ULg

Scientific conference (2012, May)

Detailed reference viewed: 21 (0 ULg)
Peer Reviewed
See detailResidual Stress in Veneering Ceramic
MAINJOT, Amélie ULg

Conference (2012, April 04)

Detailed reference viewed: 13 (1 ULg)
See detailEsthetic management : a team approach.
MAINJOT, Amélie ULg; LAMBERT, France ULg

Conference (2012, April)

Detailed reference viewed: 10 (0 ULg)
See detailLa prothèse fixe minimalement invasive.
MAINJOT, Amélie ULg

Conference (2012, March)

Detailed reference viewed: 10 (0 ULg)
See detailWhat future for zirconia in prosthodontics : state of the art and research outcomes
MAINJOT, Amélie ULg

Scientific conference (2012)

Detailed reference viewed: 23 (0 ULg)
See detailLes matériaux céramiques
MAINJOT, Amélie ULg

Scientific conference (2012)

Detailed reference viewed: 16 (1 ULg)
Full Text
See detailLimites et futur des procédés CFAO pour les prothèses tout céramique
MAINJOT, Amélie ULg

in Entretiens de Bichat. Médecine (2012)

Detailed reference viewed: 120 (5 ULg)
See detailResidual Stress in Veneering Ceramic
MAINJOT, Amélie ULg

Doctoral thesis (2011)

Detailed reference viewed: 27 (6 ULg)
Peer Reviewed
See detailInfluence de la vitesse de refroidissement sur le profil de contraintes résiduelles dans la céramique d’émaillage : mesures avec la méthode du trou incrémental
MAINJOT, Amélie ULg; Schajer, Gary; VAN HEUSDEN, Alain ULg et al

Conference (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: 87 (8 ULg)
See detailBridges tout céramique
MAINJOT, Amélie ULg

Scientific conference (2011, May)

Detailed reference viewed: 7 (0 ULg)