Monolithic and bi-layer CAD/CAM lithium-disilicate versus metal-ceramic fixed dental prostheses: comparison of fracture loads and failure modes after fatigue.
Clin Oral Investig
; 17(5): 1407-13, 2013 Jun.
Article
en En
| MEDLINE
| ID: mdl-23001151
ABSTRACT
OBJECTIVES:
The authors analyzed the effect of fatigue on the survival rate and fracture load of monolithic and bi-layer CAD/CAM lithium-disilicate posterior three-unit fixed dental prostheses (FDPs) in comparison to the metal-ceramic gold standard. MATERIALS ANDMETHODS:
The authors divided 96 human premolars and molars into three equal groups. Lithium-disilicate ceramic (IPS-e.max-CAD) was milled with the CEREC-3-system in full-anatomic FDP dimensions (monolithic M-LiCAD) or as framework (Bi-layer BL-LiCAD) with subsequent hand-layer veneering. Metal-ceramic FDPs (MC) served as control. Single-load-to-failure tests were performed before and after mouth-motion fatigue.RESULTS:
No fracture failures occurred during fatigue. Median fracture loads in [N], before and after fatigue were, respectively, as follows M-LiCAD, 1,298/1,900; BL-LiCAD, 817/699; MC, 1,966/1,818. M-LiCAD and MC FPDs revealed comparable fracture loads and were both significantly higher than BL-LiCAD. M-LiCAD and BL-LiCAD both failed from core/veneer bulk fracture within the connector area. MC failures were limited to ceramic veneer fractures exposing the metal core. Fatigue had no significant effect on any group.CONCLUSIONS:
Posterior monolithic CAD/CAM fabricated lithium-disilicate FPDs were shown to be fracture resistant with failure load results comparable to the metal-ceramic gold standard. Clinical investigations are needed to confirm these promising laboratory results. CLINICAL RELEVANCE Monolithic CAD/CAM fabricated lithium-disilicate FDPs appeared to be a reliable treatment alternative for the posterior load-bearing area, whereas FDPs in bi-layer configuration were susceptible to low load fracture failure.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Diseño de Dentadura
/
Aleaciones de Cerámica y Metal
/
Diseño Asistido por Computadora
/
Fracaso de la Restauración Dental
/
Porcelana Dental
/
Dentadura Parcial Fija
Límite:
Humans
Idioma:
En
Año:
2013
Tipo del documento:
Article