Details
| Original language | English |
|---|---|
| Pages (from-to) | 89-99 |
| Number of pages | 11 |
| Journal | BioNanoMaterials |
| Volume | 15 |
| Issue number | 3-4 |
| Publication status | Published - 29 Nov 2014 |
Abstract
The objective of this study was to test whether nanoporous silica nanoparticles can be employed as fillers in dental composite materials to improve their mechanical properties. These nanoporous silica nanoparticles were synthesized using sol-gel methods, in part modified by silanization, and thoroughly characterized. The nanoporous nanoparticles were added to dental resins to form nanocomposites (resins impregnated with nanoparticles) and hybrid composites (containing in addition conventional microfillers). The incorporation of these nanoporous nanoparticles in dental resins or composites was characterized by investigation of the complex viscosity and double bond conversion as well as by determination of flexural strength and Young's modulus. The dispersion of the nanofillers was examined by SEM and EDX imaging of fracture surfaces. Incorporation of small contents (1-3 wt%) of unmodified nanoporous particles leads to improved mechanical properties. However, the incorporation of larger contents results in particle agglomeration and declining mechanical properties. This effect is less pronounced when the surface of the particles is modified with methacrylate residues, resulting in a lower agglomeration tendency and a more homogeneous filler dispersion. Surface properties and, concomitantly, dispersibility of the nanoparticles have a strong influence on mechanical properties. But the incorporation of nanoporous instead of solid nanoparticles into dental composite materials is indeed a possibility to improve the mechanical behavior. However, modification of the surface is necessary and the key to achieving uniform dispersion and, thereby, improving mechanical properties.
Keywords
- Anisotropic shape, Hybrid composite, Mechanical properties, Nanocomposite, Nanoparticles, Nanoporosity
ASJC Scopus subject areas
- Chemical Engineering(all)
- Bioengineering
- Engineering(all)
- Biomedical Engineering
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In: BioNanoMaterials, Vol. 15, No. 3-4, 29.11.2014, p. 89-99.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nanoporous silica nanoparticles with spherical and anisotropic shape as fillers in dental composite materials
AU - Timpe, Nico
AU - Fullriede, Hendrik
AU - Borchers, Lothar
AU - Stiesch, Meike
AU - Behrens, Peter
AU - Menzel, Henning
N1 - Funding information: Acknowledgments: The authors are thankful to Natalja Wendt and Jann Lippke (Leibniz University of Hannover) for carrying out the sorption measurements and Dr. Britta Hering (Leibniz University of Hannover) for carring out the SEM imaging. This work was supported by the Deutsche Forschungsgemeinschaft as part of the Collaborative Research Center SFB 599. The groups from Hannover Medical School and from Leibniz University of Hannover also profited from support by the research initiative “Biofabri-cation for NIFE”.
PY - 2014/11/29
Y1 - 2014/11/29
N2 - The objective of this study was to test whether nanoporous silica nanoparticles can be employed as fillers in dental composite materials to improve their mechanical properties. These nanoporous silica nanoparticles were synthesized using sol-gel methods, in part modified by silanization, and thoroughly characterized. The nanoporous nanoparticles were added to dental resins to form nanocomposites (resins impregnated with nanoparticles) and hybrid composites (containing in addition conventional microfillers). The incorporation of these nanoporous nanoparticles in dental resins or composites was characterized by investigation of the complex viscosity and double bond conversion as well as by determination of flexural strength and Young's modulus. The dispersion of the nanofillers was examined by SEM and EDX imaging of fracture surfaces. Incorporation of small contents (1-3 wt%) of unmodified nanoporous particles leads to improved mechanical properties. However, the incorporation of larger contents results in particle agglomeration and declining mechanical properties. This effect is less pronounced when the surface of the particles is modified with methacrylate residues, resulting in a lower agglomeration tendency and a more homogeneous filler dispersion. Surface properties and, concomitantly, dispersibility of the nanoparticles have a strong influence on mechanical properties. But the incorporation of nanoporous instead of solid nanoparticles into dental composite materials is indeed a possibility to improve the mechanical behavior. However, modification of the surface is necessary and the key to achieving uniform dispersion and, thereby, improving mechanical properties.
AB - The objective of this study was to test whether nanoporous silica nanoparticles can be employed as fillers in dental composite materials to improve their mechanical properties. These nanoporous silica nanoparticles were synthesized using sol-gel methods, in part modified by silanization, and thoroughly characterized. The nanoporous nanoparticles were added to dental resins to form nanocomposites (resins impregnated with nanoparticles) and hybrid composites (containing in addition conventional microfillers). The incorporation of these nanoporous nanoparticles in dental resins or composites was characterized by investigation of the complex viscosity and double bond conversion as well as by determination of flexural strength and Young's modulus. The dispersion of the nanofillers was examined by SEM and EDX imaging of fracture surfaces. Incorporation of small contents (1-3 wt%) of unmodified nanoporous particles leads to improved mechanical properties. However, the incorporation of larger contents results in particle agglomeration and declining mechanical properties. This effect is less pronounced when the surface of the particles is modified with methacrylate residues, resulting in a lower agglomeration tendency and a more homogeneous filler dispersion. Surface properties and, concomitantly, dispersibility of the nanoparticles have a strong influence on mechanical properties. But the incorporation of nanoporous instead of solid nanoparticles into dental composite materials is indeed a possibility to improve the mechanical behavior. However, modification of the surface is necessary and the key to achieving uniform dispersion and, thereby, improving mechanical properties.
KW - Anisotropic shape
KW - Hybrid composite
KW - Mechanical properties
KW - Nanocomposite
KW - Nanoparticles
KW - Nanoporosity
UR - http://www.scopus.com/inward/record.url?scp=84952992679&partnerID=8YFLogxK
U2 - 10.1515/bnm-2014-0010
DO - 10.1515/bnm-2014-0010
M3 - Article
AN - SCOPUS:84952992679
VL - 15
SP - 89
EP - 99
JO - BioNanoMaterials
JF - BioNanoMaterials
SN - 2193-0651
IS - 3-4
ER -