Effect of filler fraction and filler surface treatment on wear of microfilled composites

Bum Soon Lim, Jack Ferracane, John R. Condon, Jerry D. Adey

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Objectives: The aim of this study was to determine the effect of filler content and surface treatment on the wear of microfilled composites. Methods: Four microfilled composites with different filler contents (A=20, B=25, C=30, and D=35vol.%) were made with a light-cured resin (Bis-GMA/UDMA/TEGDMA). The surface treatment of the colloidal silica in each varied: F=functional silane, NF=non-functional silane, U=untreated. Silux Plus served as a control. Specimens were made in steel molds and cured in a light curing unit Triad II (40s/side). Abrasion and attrition wear were evaluated in vitro in a wear tester (OHSU oral wear simulator) with an abrasive slurry (poppy seeds+PMMA) and a human enamel antagonist. The average of five specimens was computed and compared using a ANOVA/Tukey's test at P≤0.05. The surface of the wear patterns and the distribution of filler particles were examined using a scanning electron microscope and digital imaging. Results: As filler volume increased, wear was reduced regardless of filler treatment. Amounts of wear for specimens C and D were significantly lower than specimens A and B. Composites with functional silane treated microfiller (Group F) produced significantly less wear than those with non-functional microfiller (Group NF) at 30 and 35vol.%, and less than the untreated microfiller (Group U) at 30vol.%. Scanning electron microscopy of specimens of group NF showed large filler agglomerates (size >1μm) in the resin matrix, while specimens of group F and U showed fewer agglomerates. Digital imaging analysis revealed small filler clusters (size ≤1μm) in the resin matrix of all specimens. Significance: Wear resistance of microfilled composites is enhanced by higher filler volumes irrespective of surface treatment, but good filler/matrix adhesion is needed to minimize wear.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalDental Materials
Volume18
Issue number1
DOIs
StatePublished - Jan 2002

Fingerprint

Silanes
Surface treatment
Fillers
Wear of materials
Composite materials
Bisphenol A-Glycidyl Methacrylate
Papaver
Light
Steel
Polymethyl Methacrylate
Dental Enamel
Silicon Dioxide
Electron Scanning Microscopy
Seeds
Analysis of Variance
Fungi
Resins
Electrons
Imaging techniques
Enamels

Keywords

  • Agglomeration
  • Cluster
  • Dental composite
  • Digital imaging
  • Microfiller
  • SEM
  • Silane
  • Wear

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Effect of filler fraction and filler surface treatment on wear of microfilled composites. / Lim, Bum Soon; Ferracane, Jack; Condon, John R.; Adey, Jerry D.

In: Dental Materials, Vol. 18, No. 1, 01.2002, p. 1-11.

Research output: Contribution to journalArticle

Lim, Bum Soon ; Ferracane, Jack ; Condon, John R. ; Adey, Jerry D. / Effect of filler fraction and filler surface treatment on wear of microfilled composites. In: Dental Materials. 2002 ; Vol. 18, No. 1. pp. 1-11.
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abstract = "Objectives: The aim of this study was to determine the effect of filler content and surface treatment on the wear of microfilled composites. Methods: Four microfilled composites with different filler contents (A=20, B=25, C=30, and D=35vol.{\%}) were made with a light-cured resin (Bis-GMA/UDMA/TEGDMA). The surface treatment of the colloidal silica in each varied: F=functional silane, NF=non-functional silane, U=untreated. Silux Plus served as a control. Specimens were made in steel molds and cured in a light curing unit Triad II (40s/side). Abrasion and attrition wear were evaluated in vitro in a wear tester (OHSU oral wear simulator) with an abrasive slurry (poppy seeds+PMMA) and a human enamel antagonist. The average of five specimens was computed and compared using a ANOVA/Tukey's test at P≤0.05. The surface of the wear patterns and the distribution of filler particles were examined using a scanning electron microscope and digital imaging. Results: As filler volume increased, wear was reduced regardless of filler treatment. Amounts of wear for specimens C and D were significantly lower than specimens A and B. Composites with functional silane treated microfiller (Group F) produced significantly less wear than those with non-functional microfiller (Group NF) at 30 and 35vol.{\%}, and less than the untreated microfiller (Group U) at 30vol.{\%}. Scanning electron microscopy of specimens of group NF showed large filler agglomerates (size >1μm) in the resin matrix, while specimens of group F and U showed fewer agglomerates. Digital imaging analysis revealed small filler clusters (size ≤1μm) in the resin matrix of all specimens. Significance: Wear resistance of microfilled composites is enhanced by higher filler volumes irrespective of surface treatment, but good filler/matrix adhesion is needed to minimize wear.",
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AB - Objectives: The aim of this study was to determine the effect of filler content and surface treatment on the wear of microfilled composites. Methods: Four microfilled composites with different filler contents (A=20, B=25, C=30, and D=35vol.%) were made with a light-cured resin (Bis-GMA/UDMA/TEGDMA). The surface treatment of the colloidal silica in each varied: F=functional silane, NF=non-functional silane, U=untreated. Silux Plus served as a control. Specimens were made in steel molds and cured in a light curing unit Triad II (40s/side). Abrasion and attrition wear were evaluated in vitro in a wear tester (OHSU oral wear simulator) with an abrasive slurry (poppy seeds+PMMA) and a human enamel antagonist. The average of five specimens was computed and compared using a ANOVA/Tukey's test at P≤0.05. The surface of the wear patterns and the distribution of filler particles were examined using a scanning electron microscope and digital imaging. Results: As filler volume increased, wear was reduced regardless of filler treatment. Amounts of wear for specimens C and D were significantly lower than specimens A and B. Composites with functional silane treated microfiller (Group F) produced significantly less wear than those with non-functional microfiller (Group NF) at 30 and 35vol.%, and less than the untreated microfiller (Group U) at 30vol.%. Scanning electron microscopy of specimens of group NF showed large filler agglomerates (size >1μm) in the resin matrix, while specimens of group F and U showed fewer agglomerates. Digital imaging analysis revealed small filler clusters (size ≤1μm) in the resin matrix of all specimens. Significance: Wear resistance of microfilled composites is enhanced by higher filler volumes irrespective of surface treatment, but good filler/matrix adhesion is needed to minimize wear.

KW - Agglomeration

KW - Cluster

KW - Dental composite

KW - Digital imaging

KW - Microfiller

KW - SEM

KW - Silane

KW - Wear

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