Fractographic analysis of clinically failed anterior all ceramic crowns / 中华口腔医学杂志
Chinese Journal of Stomatology
;
(12): 225-228, 2012.
Article
Dans Chinois
| WPRIM
| ID: wpr-281626
ABSTRACT
<p><b>OBJECTIVE</b>To identify the site of crack initiation and propagation path of clinically failed all ceramic crowns by fractographic analysis.</p><p><b>METHODS</b>Three clinically failed anterior IPS Empress II crowns and two anterior In-Ceram alumina crowns were retrieved. Fracture surfaces were examined using both optical stereo and scanning electron microscopy. Fractographic theory and fracture mechanics principles were applied to disclose the damage characteristics and fracture mode.</p><p><b>RESULTS</b>All the crowns failed by cohesive failure within the veneer on the labial surface. Critical crack originated at the incisal contact area and propagated gingivally. Porosity was found within the veneer because of slurry preparation and the sintering of veneer powder.</p><p><b>CONCLUSIONS</b>Cohesive failure within the veneer is the main failure mode of all ceramic crown. Veneer becomes vulnerable when flaws are present. To reduce the chances of chipping, multi-point occlusal contacts are recommended, and layering and sintering technique of veneering layer should also be improved.</p>
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Microscopie électronique à balayage
/
Céramiques
/
Porosité
/
Analyse de panne d'appareillage
/
Échec de restauration dentaire
/
Couronnes
/
Porcelaine dentaire
/
Facettes dentaires
Type d'étude:
Étude pronostique
Limites du sujet:
Humains
langue:
Chinois
Texte intégral:
Chinese Journal of Stomatology
Année:
2012
Type:
Article
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