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Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings.

Publication ,  Journal Article
Chan, RN; Stoner, BR; Thompson, JY; Scattergood, RO; Piascik, JR
Published in: Dental materials : official publication of the Academy of Dental Materials
August 2013

The aim of this study was to evaluate strengthening mechanisms of yttria-stabilized zirconia (YSZ) thin film coatings as a viable method for improving fracture toughness of all-ceramic dental restorations.Bars (2mm×2mm×15mm, n=12) were cut from porcelain (ProCAD, Ivoclar-Vivadent) blocks and wet-polished through 1200-grit using SiC abrasive. A Vickers indenter was used to induce flaws with controlled size and geometry. Depositions were performed via radio frequency magnetron sputtering (5mT, 25°C, 30:1 Ar/O2 gas ratio) with varying powers of substrate bias. Film and flaw properties were characterized by optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD). Flexural strength was determined by three-point bending. Fracture toughness values were calculated from flaw size and fracture strength.Data show improvements in fracture strength of up to 57% over unmodified specimens. XRD analysis shows that films deposited with higher substrate bias displayed a high %monoclinic volume fraction (19%) compared to non-biased deposited films (87%), and resulted in increased film stresses and modified YSZ microstructures. SEM analysis shows critical flaw sizes of 67±1μm leading to fracture toughness improvements of 55% over unmodified specimens.Data support surface modification of dental ceramics with YSZ thin film coatings to improve fracture toughness. Increase in construct strength was attributed to increase in compressive film stresses and modified YSZ thin film microstructures. It is believed that this surface modification may lead to significant improvements and overall reliability of all-ceramic dental restorations.

Duke Scholars

Published In

Dental materials : official publication of the Academy of Dental Materials

DOI

EISSN

1879-0097

ISSN

0109-5641

Publication Date

August 2013

Volume

29

Issue

8

Start / End Page

881 / 887

Related Subject Headings

  • Zirconium
  • Yttrium
  • X-Ray Diffraction
  • Surface Properties
  • Stress, Mechanical
  • Silicon Compounds
  • Pliability
  • Microscopy, Electron, Scanning
  • Materials Testing
  • Humans
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Chan, R. N., Stoner, B. R., Thompson, J. Y., Scattergood, R. O., & Piascik, J. R. (2013). Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings. Dental Materials : Official Publication of the Academy of Dental Materials, 29(8), 881–887. https://doi.org/10.1016/j.dental.2013.05.003
Chan, Ryan N., Brian R. Stoner, Jeffrey Y. Thompson, Ronald O. Scattergood, and Jeffrey R. Piascik. “Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings.Dental Materials : Official Publication of the Academy of Dental Materials 29, no. 8 (August 2013): 881–87. https://doi.org/10.1016/j.dental.2013.05.003.
Chan RN, Stoner BR, Thompson JY, Scattergood RO, Piascik JR. Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings. Dental materials : official publication of the Academy of Dental Materials. 2013 Aug;29(8):881–7.
Chan, Ryan N., et al. “Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings.Dental Materials : Official Publication of the Academy of Dental Materials, vol. 29, no. 8, Aug. 2013, pp. 881–87. Epmc, doi:10.1016/j.dental.2013.05.003.
Chan RN, Stoner BR, Thompson JY, Scattergood RO, Piascik JR. Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings. Dental materials : official publication of the Academy of Dental Materials. 2013 Aug;29(8):881–887.
Journal cover image

Published In

Dental materials : official publication of the Academy of Dental Materials

DOI

EISSN

1879-0097

ISSN

0109-5641

Publication Date

August 2013

Volume

29

Issue

8

Start / End Page

881 / 887

Related Subject Headings

  • Zirconium
  • Yttrium
  • X-Ray Diffraction
  • Surface Properties
  • Stress, Mechanical
  • Silicon Compounds
  • Pliability
  • Microscopy, Electron, Scanning
  • Materials Testing
  • Humans