Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures

Herzl Chai, Adam J. Mieleszko, Stephen J. Chu, Yu Zhang

Research output: Contribution to journalArticle

Abstract

Objective Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. Methods Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy GC was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks. Results Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface. Significance Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.

Original languageEnglish (US)
Pages (from-to)e8-e14
JournalDental Materials
Volume34
Issue number1
DOIs
StatePublished - Jan 1 2018

Fingerprint

Dental Porcelain
Porcelain
Delamination
Zirconia
Glass
Growth
Veneers
Restoration
Resin Cements
Cracks
zirconium oxide
Dentistry
Dental Materials
Prosthodontics
Fracture energy
Video cameras
Prosthetics
Esthetics
Shielding
Fracture toughness

Keywords

  • All-ceramic dental restorations
  • Interfacial fracture energy
  • Porcelain fused to zirconia
  • Porcelain-veneered graded zirconia

ASJC Scopus subject areas

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

Cite this

Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures. / Chai, Herzl; Mieleszko, Adam J.; Chu, Stephen J.; Zhang, Yu.

In: Dental Materials, Vol. 34, No. 1, 01.01.2018, p. e8-e14.

Research output: Contribution to journalArticle

Chai, Herzl ; Mieleszko, Adam J. ; Chu, Stephen J. ; Zhang, Yu. / Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures. In: Dental Materials. 2018 ; Vol. 34, No. 1. pp. e8-e14.
@article{cdd6dd62c3754213808e28d87b036379,
title = "Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures",
abstract = "Objective Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. Methods Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy GC was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks. Results Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface. Significance Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.",
keywords = "All-ceramic dental restorations, Interfacial fracture energy, Porcelain fused to zirconia, Porcelain-veneered graded zirconia",
author = "Herzl Chai and Mieleszko, {Adam J.} and Chu, {Stephen J.} and Yu Zhang",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.dental.2017.11.004",
language = "English (US)",
volume = "34",
pages = "e8--e14",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier Science",
number = "1",

}

TY - JOUR

T1 - Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures

AU - Chai, Herzl

AU - Mieleszko, Adam J.

AU - Chu, Stephen J.

AU - Zhang, Yu

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Objective Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. Methods Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy GC was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks. Results Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface. Significance Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.

AB - Objective Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. Methods Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy GC was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks. Results Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface. Significance Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.

KW - All-ceramic dental restorations

KW - Interfacial fracture energy

KW - Porcelain fused to zirconia

KW - Porcelain-veneered graded zirconia

UR - http://www.scopus.com/inward/record.url?scp=85034813020&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85034813020&partnerID=8YFLogxK

U2 - 10.1016/j.dental.2017.11.004

DO - 10.1016/j.dental.2017.11.004

M3 - Article

VL - 34

SP - e8-e14

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

IS - 1

ER -