Microstructural characterization and fracture behavior of a microhybrid and a nanofill composite

Sinval A. Rodrigues, Susanne S. Scherrer, Jack Ferracane, Álvaro Della Bona

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Objectives: To characterize the microstructure and composition of two different composites, and to determine their influence on the physical properties and fracture behavior. Methods: The microstructure and composition of a microhybrid (Filtek Z250™-Z2) and a nanofill (Filtek Supreme™-SU) composite were analyzed using scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS). Filler wt% was determined by thermogravimetric analysis. Hardness (H) and degree of conversion (DC) were evaluated at top and bottom surfaces of 2-mm thick specimens, and the dynamic elastic modulus (E) was determined with ultrasonic waves. Bar specimens (n = 30) were subjected to flexure loading and flexural strength (σf) was calculated (MPa). Fractographic analysis (FA) was performed to determine the fracture origin (c) for calculation of fracture toughness (KIc), and these results were compared to those from the single edge notch beam (SENB) method. Results were statistically analyzed using two-way ANOVA, Student's t-test and Weibull analysis (α = 0.05). Results: Z2 had higher filler wt%, H, E and DC at 2-mm depth as compared with SU. The fracture behavior (σf and KIc) and the structural reliability (m) of the composites were similar. Results of KIc tested by SENB or calculated from fracture surfaces from flexure testing were similar. Significance: The microstructural organization of the composites determines their physical properties, in spite of the similar filler content. In contrast, the microstructure did not influence the fracture behavior and the structural reliability of these highly filled composites. FA was shown to be a reliable method for determining the KIc of composites.

Original languageEnglish (US)
Pages (from-to)1281-1288
Number of pages8
JournalDental Materials
Volume24
Issue number9
DOIs
StatePublished - Sep 2008

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Composite materials
Fillers
Elastic Modulus
Hardness
Electron Scanning Microscopy
Microstructure
Spectrum Analysis
Analysis of Variance
Physical properties
Electrons
Students
Ultrasonic waves
Analysis of variance (ANOVA)
Chemical analysis
Bending strength
Thermogravimetric analysis
Fracture toughness
Elastic moduli
Spectroscopy
Scanning electron microscopy

Keywords

  • Characterization
  • Composite resin
  • Fractography
  • Fracture toughness
  • Mechanical properties

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Microstructural characterization and fracture behavior of a microhybrid and a nanofill composite. / Rodrigues, Sinval A.; Scherrer, Susanne S.; Ferracane, Jack; Bona, Álvaro Della.

In: Dental Materials, Vol. 24, No. 9, 09.2008, p. 1281-1288.

Research output: Contribution to journalArticle

Rodrigues, Sinval A. ; Scherrer, Susanne S. ; Ferracane, Jack ; Bona, Álvaro Della. / Microstructural characterization and fracture behavior of a microhybrid and a nanofill composite. In: Dental Materials. 2008 ; Vol. 24, No. 9. pp. 1281-1288.
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AB - Objectives: To characterize the microstructure and composition of two different composites, and to determine their influence on the physical properties and fracture behavior. Methods: The microstructure and composition of a microhybrid (Filtek Z250™-Z2) and a nanofill (Filtek Supreme™-SU) composite were analyzed using scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS). Filler wt% was determined by thermogravimetric analysis. Hardness (H) and degree of conversion (DC) were evaluated at top and bottom surfaces of 2-mm thick specimens, and the dynamic elastic modulus (E) was determined with ultrasonic waves. Bar specimens (n = 30) were subjected to flexure loading and flexural strength (σf) was calculated (MPa). Fractographic analysis (FA) was performed to determine the fracture origin (c) for calculation of fracture toughness (KIc), and these results were compared to those from the single edge notch beam (SENB) method. Results were statistically analyzed using two-way ANOVA, Student's t-test and Weibull analysis (α = 0.05). Results: Z2 had higher filler wt%, H, E and DC at 2-mm depth as compared with SU. The fracture behavior (σf and KIc) and the structural reliability (m) of the composites were similar. Results of KIc tested by SENB or calculated from fracture surfaces from flexure testing were similar. Significance: The microstructural organization of the composites determines their physical properties, in spite of the similar filler content. In contrast, the microstructure did not influence the fracture behavior and the structural reliability of these highly filled composites. FA was shown to be a reliable method for determining the KIc of composites.

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