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Ebadian B, Mosharraf R, Abbasi M. Effect of ceramic cooling protocols and zirconia coloring on fracture load of zirconia-based restorations. Dent Res J (Isfahan). 2018;15(1):17-24doi: 10.4103/1735-3327.223612.
Ebadian, B., Mosharraf, R., & Abbasi, M. (2018). Effect of ceramic cooling protocols and zirconia coloring on fracture load of zirconia-based restorations. Dental research journal, 15(1), 17-24. https://doi.org/10.4103/1735-3327.223612
Ebadian, Behnaz, et al. "Effect of ceramic cooling protocols and zirconia coloring on fracture load of zirconia-based restorations." Dental research journal vol. 15,1 (2018): 17-24. doi: https://doi.org/10.4103/1735-3327.223612
Ebadian B, Mosharraf R, Abbasi M. Effect of ceramic cooling protocols and zirconia coloring on fracture load of zirconia-based restorations. Dent Res J (Isfahan). 2018 Jan-Feb;15(1):17-24. doi: 10.4103/1735-3327.223612. PMID: 29497443; PMCID: PMC5806426.
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Dent Res J (Isfahan). 2018 Jan-Feb;15(1):17-24. doi: 10.4103/1735-3327.223612.

Effect of ceramic cooling protocols and zirconia coloring on fracture load of zirconia-based restorations.

Dental research journal

Behnaz Ebadian, Ramin Mosharraf, Mahsa Abbasi

Affiliations

  1. Department of Prosthodontics, Dental Implant Research Center, School of Dentistry, Isfahan University of Medical Science, Isfahan, Iran.
  2. Department of Prosthodontics, Dental Material Research Center, School of Dentistry, Isfahan University of Medical Science, Isfahan, Iran.
  3. Department of Prosthodontics, School of Dentistry, Shahrekord University of Medical Science, Shahrekord, Iran.

PMID: 29497443 PMCID: PMC5806426 DOI: 10.4103/1735-3327.223612

Abstract

BACKGROUND: Residual thermal stresses in dental porcelains can cause clinical failure. Porcelain cooling protocols may affect the amount of residual stresses within porcelain and also porcelain-zirconia bond strength. The objective of this study was to assess the effect of cooling protocols on the fracture load of porcelain veneered zirconia restorations.

MATERIALS AND METHODS: Forty zirconia bars (31 mm × 6.5 mm × 1.35 mm ± 0.1 mm) were fabricated by computer-aided design and computer-aided manufacturing technology. Half of the specimens were immersed in the coloring agent for 2 min before sintering (yellow group). Thus, the specimens were divided into two groups of white (W) and yellow (Y) samples (

RESULTS: Fractures were cohesive in all samples (within the porcelain adjacent to the interface). Two-way ANOVA showed that the effect of cooling protocol on the fracture load of samples was statistically significant (

CONCLUSION: Slow cooling protocol should be preferably applied for zirconia restorations. Coloring agent used in this study had a significant negative effect on fracture load.

Keywords: Computer-aided design; dental bonding; dental porcelain; zirconium oxide

Conflict of interest statement

There are no conflicts of interest.

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