The mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique.

Hdl Handle:
http://hdl.handle.net/10147/124107
Title:
The mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique.
Authors:
Curtis, Andrew R; Palin, William M; Fleming, Garry J P; Shortall, Adrian C C; Marquis, Peter M
Affiliation:
Biomaterials Unit, School of Dentistry, University of Birmingham, St. Chads Queensway, Birmingham B4 6NN, UK.
Citation:
The mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique. 2009, 25 (2):180-7 Dent Mater
Journal:
Dental materials : official publication of the Academy of Dental Materials
Issue Date:
Feb-2009
URI:
http://hdl.handle.net/10147/124107
DOI:
10.1016/j.dental.2008.05.013
PubMed ID:
18656254
Abstract:
To assess the mechanical properties of discrete filler particles representative of several inorganic fillers in modern dental resin-based composites (RBCs) and to assess the validity of a novel micromanipulation technique.; RBCs with microhybrid (Filtek Z250), 'nanohybrid' (Grandio) and 'nanofilled' (Filtek Supreme), filler particle morphologies were investigated. Filler particles were provided by the manufacturer or separated from the unpolymerized resin using a dissolution technique. Filler particles (n=30) were subjected to compression using a micromanipulation technique between a descending glass probe and a glass slide. The number of distinct fractures particles underwent was determined from force/displacement and stress/deformation curves and the force at fracture and pseudo-modulus of stress was calculated.; Agglomerated fillers ('nanoclusters') exhibited up to four distinct fractures, while spheroidal and irregular particles underwent either a single fracture or did not fracture following micromanipulation. Z-tests highlighted failure of nanoclusters to be significant compared with spheroidal and irregular particles (P<0.05). The mean force at first fracture of the nanoclusters was greater (1702+/-909 microN) than spheroidal and irregular particles (1389+/-1342 and 1356+/-1093 microN, respectively). Likewise, the initial pseudo-modulus of stress of nanoclusters (797+/-555 MPa) was also greater than spheroidal (587+/-439 MPa) or irregular (552+/-275 MPa) fillers.; The validity of employing the micromanipulation technique to determine the mechanical properties of filler particulates was established. The 'nanoclusters' exhibited a greater tendency to multiple fractures compared with conventional fillers and possessed a comparatively higher variability of pseudo-modulus and load prior to and at fracture, which may modify the damage tolerance of the overall RBC system.
Item Type:
Article
Language:
en
MeSH:
Aluminum Silicates; Barium Compounds; Composite Resins; Dental Materials; Elastic Modulus; Feasibility Studies; Glass; Humans; Materials Testing; Micromanipulation; Microscopy, Electron, Scanning; Nanocomposites; Particle Size; Pressure; Silicates; Silicon Dioxide; Solubility; Stress, Mechanical; Surface Properties; Zirconium
ISSN:
1879-0097

Full metadata record

DC FieldValue Language
dc.contributor.authorCurtis, Andrew Ren
dc.contributor.authorPalin, William Men
dc.contributor.authorFleming, Garry J Pen
dc.contributor.authorShortall, Adrian C Cen
dc.contributor.authorMarquis, Peter Men
dc.date.accessioned2011-03-10T10:09:11Z-
dc.date.available2011-03-10T10:09:11Z-
dc.date.issued2009-02-
dc.identifier.citationThe mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique. 2009, 25 (2):180-7 Dent Materen
dc.identifier.issn1879-0097-
dc.identifier.pmid18656254-
dc.identifier.doi10.1016/j.dental.2008.05.013-
dc.identifier.urihttp://hdl.handle.net/10147/124107-
dc.description.abstractTo assess the mechanical properties of discrete filler particles representative of several inorganic fillers in modern dental resin-based composites (RBCs) and to assess the validity of a novel micromanipulation technique.-
dc.description.abstractRBCs with microhybrid (Filtek Z250), 'nanohybrid' (Grandio) and 'nanofilled' (Filtek Supreme), filler particle morphologies were investigated. Filler particles were provided by the manufacturer or separated from the unpolymerized resin using a dissolution technique. Filler particles (n=30) were subjected to compression using a micromanipulation technique between a descending glass probe and a glass slide. The number of distinct fractures particles underwent was determined from force/displacement and stress/deformation curves and the force at fracture and pseudo-modulus of stress was calculated.-
dc.description.abstractAgglomerated fillers ('nanoclusters') exhibited up to four distinct fractures, while spheroidal and irregular particles underwent either a single fracture or did not fracture following micromanipulation. Z-tests highlighted failure of nanoclusters to be significant compared with spheroidal and irregular particles (P<0.05). The mean force at first fracture of the nanoclusters was greater (1702+/-909 microN) than spheroidal and irregular particles (1389+/-1342 and 1356+/-1093 microN, respectively). Likewise, the initial pseudo-modulus of stress of nanoclusters (797+/-555 MPa) was also greater than spheroidal (587+/-439 MPa) or irregular (552+/-275 MPa) fillers.-
dc.description.abstractThe validity of employing the micromanipulation technique to determine the mechanical properties of filler particulates was established. The 'nanoclusters' exhibited a greater tendency to multiple fractures compared with conventional fillers and possessed a comparatively higher variability of pseudo-modulus and load prior to and at fracture, which may modify the damage tolerance of the overall RBC system.-
dc.language.isoenen
dc.subject.meshAluminum Silicates-
dc.subject.meshBarium Compounds-
dc.subject.meshComposite Resins-
dc.subject.meshDental Materials-
dc.subject.meshElastic Modulus-
dc.subject.meshFeasibility Studies-
dc.subject.meshGlass-
dc.subject.meshHumans-
dc.subject.meshMaterials Testing-
dc.subject.meshMicromanipulation-
dc.subject.meshMicroscopy, Electron, Scanning-
dc.subject.meshNanocomposites-
dc.subject.meshParticle Size-
dc.subject.meshPressure-
dc.subject.meshSilicates-
dc.subject.meshSilicon Dioxide-
dc.subject.meshSolubility-
dc.subject.meshStress, Mechanical-
dc.subject.meshSurface Properties-
dc.subject.meshZirconium-
dc.titleThe mechanical properties of nanofilled resin-based composites: characterizing discrete filler particles and agglomerates using a micromanipulation technique.en
dc.typeArticleen
dc.contributor.departmentBiomaterials Unit, School of Dentistry, University of Birmingham, St. Chads Queensway, Birmingham B4 6NN, UK.en
dc.identifier.journalDental materials : official publication of the Academy of Dental Materialsen
dc.description.provinceLeinster-

Related articles on PubMed

All Items in Lenus, The Irish Health Repository are protected by copyright, with all rights reserved, unless otherwise indicated.