The effect of filler and silane content on conversion of resin-based composite
| Autor: | Rolf H. Halvorson, Robert L. Erickson, Carel L. Davidson |
|---|---|
| Přispěvatelé: | Tandheelkundige Materiaalwetenschappen (OUD, ACTA) |
| Rok vydání: | 2003 |
| Předmět: |
Filler (packaging)
Materials science Light Polymers Composite number Resin-Based Composite Methacrylate Composite Resins Polyethylene Glycols chemistry.chemical_compound Polymethacrylic Acids Materials Testing Spectroscopy Fourier Transform Infrared General Materials Science Cubic zirconia Fourier transform infrared spectroscopy Composite material General Dentistry Degree of unsaturation Silanes Silicon Dioxide Silane chemistry Mechanics of Materials Methacrylates Zirconium |
| Zdroj: | Halvorson, R H, Erickson, R L & Davidson, C L 2003, ' The effect of filler and silane content on conversion of resin based composite ', Dental Materials, vol. 19, pp. 327-333 . https://doi.org/10.1016/S0109-5641(02)00062-3 Dental Materials, 19, 327-333. Elsevier Dental Materials, 19, 327-333. Elsevier Science |
| ISSN: | 0109-5641 |
| Popis: | Objective. This study examines the influence of filler loading and silane content on the conversion of photoactivated, resin-based composites as determined using Fourier transform infrared spectroscopy (FTIR). Method. Zirconia/silica filler was processed with a silane coupling agent (γ-methacryloxypropyltrimethoxysilane) to achieve a range of silane-to-filler compositions. Treated fillers were compounded with a photoactivated BisGMA/TEGDMA resin to yield a series of pastes all containing 72 wt% total solids. Diffuse reflectance FTIR was used to characterize methacrylate unsaturation of the silane on the filler particles while paste conversion was determined using transmission FTIR. A resin matrix conversion was determined by adjusting the paste conversion for silane unsaturation. Two additional series of pastes were compounded to achieve variable filler-to-resin ratios using non-treated filler and filler processed with 8 wt% silane. Paste conversion was determined using transmission FTIR. Results. Pastes compounded from fillers containing variable percent silane demonstrated linearly decreasing conversion (R2=0.986) with increasing silane content and ranged from 52.7 to 62.8%. Adjusting paste conversion for silane unsaturation yielded similar resin matrix conversion for all cured pastes (65.1±0.8%). Pastes compounded with increasing filler-to-resin ratios had progressively decreasing conversion. Correcting for silane unsaturation suggests this effect was independent of whether the filler was silane-treated or not. Significance. Composite resin matrix conversion as determined via FTIR can be underestimated by the presence of unreacted methacrylate from silane on the filler. A corrected resin matrix conversion can be estimated by adjusting for silane unsaturation. Additionally, increasing filler-to-resin ratio progressively decreases conversion independent of the presence of silane on the filler. |
| Databáze: | OpenAIRE |
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