Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges

Vinicius P. Fardin, Vitor Guarconi de Paula, Estevam A. Bonfante, Paulo Coelho, Gerson Bonfante

Research output: Contribution to journalArticle

Abstract

Objective To evaluate the fatigue life of zirconia-veneered and metal-ceramic crowns comprised by an even thickness or a modified framework design when loaded on marginal ridges. Methods Eighty marginal ridges were present after fabrication of forty molar crowns cemented onto composite-resin replicas and divided (n = 20/each), in the following groups: metal-ceramic with even thickness (MCev) or with a modified framework design (MCm, lingual collar with proximal struts); porcelain-fused to zirconia with even thickness (PFZev) or with the modified framework design (PFZm). Each marginal ridge (mesial and distal) was subjected to cyclic loading separately with a lithium disilicate indenter for 106 cycles or until fracture. Kruskal–Wallis and Wilcoxon matched pair test (p < 0.05) evaluated both marginal ridges. Every 125,000 cycles, the test was interrupted for damage inspection. Weibull distribution (90% confidence bounds) determined the probability of survival (reliability). Results Weibull 2-parameter contour-plot showed significantly higher fatigue life for PFZev compared to MC, and comparable with PFZm. A significant decrease in reliability was observed between groups from 625,000 until 106 cycles. Metal-ceramic groups presented significantly lower probability of survival at 106 cycles (MCev = 0.66% and MCm = 4.73%) compared to PFZm (23.41%) and PFZev (36.68%). Fractographic marks showed a consistent fracture origin and direction of crack propagation. Reliability was higher for porcelain-fused to zirconia than for metal ceramic crowns, regardless of framework design. Significance Zirconia-veneered crowns presented decreased fracture rates compared to metal ceramics, even when loaded at marginal ridges, regardless of framework design.

Original languageEnglish (US)
Pages (from-to)1543-1554
Number of pages12
JournalDental Materials
Volume32
Issue number12
DOIs
StatePublished - Dec 1 2016

Fingerprint

Cermets
Ceramics
Crowns
Zirconia
Metals
Dental Porcelain
Porcelain
Fatigue
Fatigue of materials
Composite Resins
Weibull distribution
Struts
Tongue
Crack propagation
Lithium
Resins
Inspection
zirconium oxide
Fabrication
Composite materials

Keywords

  • Crowns
  • Fatigue
  • Metal ceramic
  • Weibull
  • Zirconia

ASJC Scopus subject areas

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

Cite this

Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges. / Fardin, Vinicius P.; de Paula, Vitor Guarconi; Bonfante, Estevam A.; Coelho, Paulo; Bonfante, Gerson.

In: Dental Materials, Vol. 32, No. 12, 01.12.2016, p. 1543-1554.

Research output: Contribution to journalArticle

Fardin, Vinicius P. ; de Paula, Vitor Guarconi ; Bonfante, Estevam A. ; Coelho, Paulo ; Bonfante, Gerson. / Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges. In: Dental Materials. 2016 ; Vol. 32, No. 12. pp. 1543-1554.
@article{313cf3d24a1c4cf6a86777e767a1e689,
title = "Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges",
abstract = "Objective To evaluate the fatigue life of zirconia-veneered and metal-ceramic crowns comprised by an even thickness or a modified framework design when loaded on marginal ridges. Methods Eighty marginal ridges were present after fabrication of forty molar crowns cemented onto composite-resin replicas and divided (n = 20/each), in the following groups: metal-ceramic with even thickness (MCev) or with a modified framework design (MCm, lingual collar with proximal struts); porcelain-fused to zirconia with even thickness (PFZev) or with the modified framework design (PFZm). Each marginal ridge (mesial and distal) was subjected to cyclic loading separately with a lithium disilicate indenter for 106 cycles or until fracture. Kruskal–Wallis and Wilcoxon matched pair test (p < 0.05) evaluated both marginal ridges. Every 125,000 cycles, the test was interrupted for damage inspection. Weibull distribution (90{\%} confidence bounds) determined the probability of survival (reliability). Results Weibull 2-parameter contour-plot showed significantly higher fatigue life for PFZev compared to MC, and comparable with PFZm. A significant decrease in reliability was observed between groups from 625,000 until 106 cycles. Metal-ceramic groups presented significantly lower probability of survival at 106 cycles (MCev = 0.66{\%} and MCm = 4.73{\%}) compared to PFZm (23.41{\%}) and PFZev (36.68{\%}). Fractographic marks showed a consistent fracture origin and direction of crack propagation. Reliability was higher for porcelain-fused to zirconia than for metal ceramic crowns, regardless of framework design. Significance Zirconia-veneered crowns presented decreased fracture rates compared to metal ceramics, even when loaded at marginal ridges, regardless of framework design.",
keywords = "Crowns, Fatigue, Metal ceramic, Weibull, Zirconia",
author = "Fardin, {Vinicius P.} and {de Paula}, {Vitor Guarconi} and Bonfante, {Estevam A.} and Paulo Coelho and Gerson Bonfante",
year = "2016",
month = "12",
day = "1",
doi = "10.1016/j.dental.2016.09.004",
language = "English (US)",
volume = "32",
pages = "1543--1554",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier Science",
number = "12",

}

TY - JOUR

T1 - Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges

AU - Fardin, Vinicius P.

AU - de Paula, Vitor Guarconi

AU - Bonfante, Estevam A.

AU - Coelho, Paulo

AU - Bonfante, Gerson

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Objective To evaluate the fatigue life of zirconia-veneered and metal-ceramic crowns comprised by an even thickness or a modified framework design when loaded on marginal ridges. Methods Eighty marginal ridges were present after fabrication of forty molar crowns cemented onto composite-resin replicas and divided (n = 20/each), in the following groups: metal-ceramic with even thickness (MCev) or with a modified framework design (MCm, lingual collar with proximal struts); porcelain-fused to zirconia with even thickness (PFZev) or with the modified framework design (PFZm). Each marginal ridge (mesial and distal) was subjected to cyclic loading separately with a lithium disilicate indenter for 106 cycles or until fracture. Kruskal–Wallis and Wilcoxon matched pair test (p < 0.05) evaluated both marginal ridges. Every 125,000 cycles, the test was interrupted for damage inspection. Weibull distribution (90% confidence bounds) determined the probability of survival (reliability). Results Weibull 2-parameter contour-plot showed significantly higher fatigue life for PFZev compared to MC, and comparable with PFZm. A significant decrease in reliability was observed between groups from 625,000 until 106 cycles. Metal-ceramic groups presented significantly lower probability of survival at 106 cycles (MCev = 0.66% and MCm = 4.73%) compared to PFZm (23.41%) and PFZev (36.68%). Fractographic marks showed a consistent fracture origin and direction of crack propagation. Reliability was higher for porcelain-fused to zirconia than for metal ceramic crowns, regardless of framework design. Significance Zirconia-veneered crowns presented decreased fracture rates compared to metal ceramics, even when loaded at marginal ridges, regardless of framework design.

AB - Objective To evaluate the fatigue life of zirconia-veneered and metal-ceramic crowns comprised by an even thickness or a modified framework design when loaded on marginal ridges. Methods Eighty marginal ridges were present after fabrication of forty molar crowns cemented onto composite-resin replicas and divided (n = 20/each), in the following groups: metal-ceramic with even thickness (MCev) or with a modified framework design (MCm, lingual collar with proximal struts); porcelain-fused to zirconia with even thickness (PFZev) or with the modified framework design (PFZm). Each marginal ridge (mesial and distal) was subjected to cyclic loading separately with a lithium disilicate indenter for 106 cycles or until fracture. Kruskal–Wallis and Wilcoxon matched pair test (p < 0.05) evaluated both marginal ridges. Every 125,000 cycles, the test was interrupted for damage inspection. Weibull distribution (90% confidence bounds) determined the probability of survival (reliability). Results Weibull 2-parameter contour-plot showed significantly higher fatigue life for PFZev compared to MC, and comparable with PFZm. A significant decrease in reliability was observed between groups from 625,000 until 106 cycles. Metal-ceramic groups presented significantly lower probability of survival at 106 cycles (MCev = 0.66% and MCm = 4.73%) compared to PFZm (23.41%) and PFZev (36.68%). Fractographic marks showed a consistent fracture origin and direction of crack propagation. Reliability was higher for porcelain-fused to zirconia than for metal ceramic crowns, regardless of framework design. Significance Zirconia-veneered crowns presented decreased fracture rates compared to metal ceramics, even when loaded at marginal ridges, regardless of framework design.

KW - Crowns

KW - Fatigue

KW - Metal ceramic

KW - Weibull

KW - Zirconia

UR - http://www.scopus.com/inward/record.url?scp=85004008303&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85004008303&partnerID=8YFLogxK

U2 - 10.1016/j.dental.2016.09.004

DO - 10.1016/j.dental.2016.09.004

M3 - Article

C2 - 27697333

AN - SCOPUS:85004008303

VL - 32

SP - 1543

EP - 1554

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

IS - 12

ER -