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.
Artículo
en Chino
| 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>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Microscopía Electrónica de Rastreo
/
Cerámica
/
Porosidad
/
Análisis de Falla de Equipo
/
Fracaso de la Restauración Dental
/
Coronas
/
Porcelana Dental
/
Coronas con Frente Estético
Tipo de estudio:
Estudio pronóstico
Límite:
Humanos
Idioma:
Chino
Revista:
Chinese Journal of Stomatology
Año:
2012
Tipo del documento:
Artículo
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