Abstract
This study evaluated the effects of nanofiller surface treatment and resin viscosity on the early and long-term properties of experimental hybrid composites. Three resin formulations (low, medium and high viscosity) were prepared by varying the ratio of TEGDMA:UDMA:bis-GMA (47:33:16wt%; 30:33:33wt%; 12:33:51wt%). Composites contained 71.3wt% silanated strontium glass (1-3μm) and 12.6wt% of either silanated or unsilanated silica (OX-50; 0.04μm). Specimens (n=10) for flexural strength, flexural modulus, fracture toughness and Knoop hardness were tested after 24h, 1 and 6 months exposure to water at 37°C. Degree of conversion (DC) was determined 24h after photoinitiation using FTIR. Resin viscosity only had a marginal influence on the mechanical response of composites but it can be adjusted to achieve a balance between DC and mechanical properties. Adding non-bonded nanofiller to hybrid composites had no systematic effect on DC. Non-bonded nanofillers had no significant effect on the long-term properties of hybrid composites.
Original language | English (US) |
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Pages (from-to) | 4065-4071 |
Number of pages | 7 |
Journal | Biomaterials |
Volume | 25 |
Issue number | 18 |
DOIs | |
State | Published - Aug 2004 |
Keywords
- Composite
- Nanofiller
- Properties
- Silane
- Viscosity
ASJC Scopus subject areas
- Bioengineering
- Ceramics and Composites
- Biophysics
- Biomaterials
- Mechanics of Materials