RESUMEN
Six kinds of experimental magnetic resin composites containing SUS447J1 stainless steel particles as filler were prepared. UDMA/MAA resin with an MAA mole fraction of 0.67 was used as the matrix resin. The effects of six levels of 4-META content (2, 4, 6, 8, 10, and 12 mass%) on the setting and flexural properties were studied. The metal filler content in each paste was 90 mass%. Although working time and setting time significantly diminished with the increase of the BPO and DMPT contents, both working time and setting time satisfied the ISO 4049 requirements for all experimental levels. Flexural strength and elastic modules significantly improved with the increase of 4-META content up to 10%. The optimum 4-META content necessary to develop better composite resins for magnetic attachment has been clarified.
Asunto(s)
Resinas Compuestas/química , Análisis del Estrés Dental , Retención de Dentadura , Dentadura Parcial Removible , Ensayo de Materiales , Metacrilatos/análisis , Ácidos Polimetacrílicos/química , Resinas Compuestas/síntesis química , Aleaciones Dentales , Magnetismo/instrumentación , Imanes , Metacrilatos/química , Ácidos Polimetacrílicos/análisis , Poliuretanos , Acero InoxidableRESUMEN
Nine kinds of experimental soft magnetic resin composites containing SUS447J1 stainless steel particles as filler were prepared. A UDMA/MAA resin with an MAA mole fraction of 0.67 was used as a matrix resin. The effects of three levels of 4-META content and three levels of filler content on the setting and flexural properties were studied. Working time and setting time significantly increased with increase of 4-META and filler contents. Flexural strength significantly increased with increase of 4-META content but with decrease of filler content. Elastic modulus simply increased with increase of both 4-META and filler contents. Although the flexural strength obtained was low, results were considered promising being the first step of this novel development.
Asunto(s)
Resinas Compuestas/química , Resinas Compuestas/síntesis química , Retención de Dentadura/instrumentación , Dentadura Parcial Removible , Magnetismo/instrumentación , Análisis del Estrés Dental , Elasticidad , Metacrilatos , Docilidad , Poliuretanos , Acero Inoxidable , Raíz del DienteRESUMEN
A metal-resin composite material was experimentally prepared by mixing a powder consisting of Ag-Cu particles and BPO with a paste consisting of UDMA-based monomer and 4-META in the absence of tertiary amine. The working time and setting time were mainly affected by the amounts of 4-META, BPO and metal particles, most of them fulfilling the requirements for working time and setting time specified in ISO 4049:2000 in the present experimental conditions. The flexural strength ranged from 49.6 MPa to 77.8 MPa, and the highest value was obtained when the 4-META concentration was high and metal particle content was low. The flexural modulus of elasticity, ranging from 6.7 GPa to 11.9 GPa, significantly increased as the 4-META concentration and metal particle content increased. Based on its mechanical properties, this metal-resin composite in which metal particles are involved in the polymerization initiation system has the potential to be used as a dental restorative material.
