Reactive fibre reinforced glass ionomer cements.
Biomaterials
; 24(17): 2901-7, 2003 Aug.
Article
en En
| MEDLINE
| ID: mdl-12742729
ABSTRACT
The mechanical properties of glass ionomer cements used in restorative dentistry reinforced by chopped glass fibres were investigated. Reactive glass fibres with a composition in the system SiO(2)-Al(2)O(3)-CaF(2)-Na(3)AlF(6) and a thickness of 26 microm were drawn by a bushing process. The manufacturing parameters were optimized with respect to maximum strength of the glass fibre reinforced ionomer cements. Powder to liquid ratio, pre-treatment of the glass, grain size distribution and fibre volume fraction were varied. Glass fibre and cement were characterized by X-ray diffraction, transmission electron microscopy and energy dispersive spectroscopy techniques, respectively. The highest flexural strength of the reinforced cement (15.6 MPa) was found by compounding 20 vol% reactive fibres and extending the initial dry gelation period up to 30 min. Microscopic examination of the fractured cements indicated a distinct reactive layer at the fibre surface. A pronounced fibre pull out mode gives rise to an additional work-of-fracture contributed by pulling the fibres out of the fracture surface.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ensayo de Materiales
/
Vidrio
/
Cementos de Ionómero Vítreo
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
Biomaterials
Año:
2003
Tipo del documento:
Article
País de afiliación:
Alemania