Y-TZP ceramic processing from coprecipitated powders: A comparative study with three commercial dental ceramics

Dolores R R Lazar, Marco C. Bottino, Mutlu Özcan, Luiz Felipe Valandro, Regina Amaral, Valter Ussui, Ana H A Bressiani

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Objectives: (1) To synthesize 3 mol% yttria-stabilized zirconia (3Y-TZP) powders via coprecipitation route, (2) to obtain zirconia ceramic specimens, analyze surface characteristics, and mechanical properties, and (3) to compare the processed material with three reinforced dental ceramics. Methods: A coprecipitation route was used to synthesize a 3 mol% yttria-stabilized zirconia ceramic processed by uniaxial compaction and pressureless sintering. Commercially available alumina or alumina/zirconia ceramics, namely Procera AllCeram (PA), In-Ceram Zirconia Block (CAZ) and In-Ceram Zirconia (IZ) were chosen for comparison. All specimens (6 mm × 5 mm × 5 mm) were polished and ultrasonically cleaned. Qualitative phase analysis was performed by XRD and apparent densities were measured on the basis of Archimedes principle. Ceramics were also characterized using SEM, TEM and EDS. The hardness measurements were made employing Vickers hardness test. Fracture toughness (KIC) was calculated. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey's test (α = 0.05). Results: ANOVA revealed that the Vickers hardness (p <0.0001) and fracture toughness (p <0.0001) were affected by the ceramic materials composition. It was confirmed that the PA ceramic was constituted of a rhombohedral alumina matrix, so-called α-alumina. Both CAZ and IZ ceramics presented tetragonal zirconia and α-alumina mixture of phases. The SEM/EDS analysis confirmed the presence of aluminum in PA ceramic. In the IZ and CAZ ceramics aluminum, zirconium and cerium in grains involved by a second phase containing aluminum, silicon and lanthanum were identified. PA showed significantly higher mean Vickers hardness values (HV) (18.4 ± 0.5 GPa) compared to vitreous CAZ (10.3 ± 0.2 GPa) and IZ (10.6 ± 0.4 GPa) ceramics. Experimental Y-TZP showed significantly lower results than that of the other monophased ceramic (PA) (p <0.05) but it showed significantly higher fracture toughness (6.0 ± 0.2 MPa m1/2) values when compared to the other tested ceramics (p <0.05). Significance: The coprecipitation method used to synthesize zirconia powders and the adopted ceramic processing conditions led to ceramics with mechanical properties comparable to commercially available reinforced ceramic materials.

Original languageEnglish (US)
Pages (from-to)1676-1685
Number of pages10
JournalDental Materials
Volume24
Issue number12
DOIs
StatePublished - Dec 2008
Externally publishedYes

Fingerprint

Ceramics
Zirconia
Powders
Tooth
Aluminum Oxide
Processing
Vickers hardness
Coprecipitation
Aluminum
Fracture toughness
Alumina
Yttria stabilized zirconia
Ceramic materials
Analysis of variance (ANOVA)
Energy dispersive spectroscopy
Hardness
Cerium
Lanthanum
Mechanical properties
Scanning electron microscopy

Keywords

  • Alumina
  • Dental ceramics
  • Fracture toughness
  • Zirconia

ASJC Scopus subject areas

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

Cite this

Lazar, D. R. R., Bottino, M. C., Özcan, M., Valandro, L. F., Amaral, R., Ussui, V., & Bressiani, A. H. A. (2008). Y-TZP ceramic processing from coprecipitated powders: A comparative study with three commercial dental ceramics. Dental Materials, 24(12), 1676-1685. https://doi.org/10.1016/j.dental.2008.04.002

Y-TZP ceramic processing from coprecipitated powders : A comparative study with three commercial dental ceramics. / Lazar, Dolores R R; Bottino, Marco C.; Özcan, Mutlu; Valandro, Luiz Felipe; Amaral, Regina; Ussui, Valter; Bressiani, Ana H A.

In: Dental Materials, Vol. 24, No. 12, 12.2008, p. 1676-1685.

Research output: Contribution to journalArticle

Lazar, DRR, Bottino, MC, Özcan, M, Valandro, LF, Amaral, R, Ussui, V & Bressiani, AHA 2008, 'Y-TZP ceramic processing from coprecipitated powders: A comparative study with three commercial dental ceramics', Dental Materials, vol. 24, no. 12, pp. 1676-1685. https://doi.org/10.1016/j.dental.2008.04.002
Lazar, Dolores R R ; Bottino, Marco C. ; Özcan, Mutlu ; Valandro, Luiz Felipe ; Amaral, Regina ; Ussui, Valter ; Bressiani, Ana H A. / Y-TZP ceramic processing from coprecipitated powders : A comparative study with three commercial dental ceramics. In: Dental Materials. 2008 ; Vol. 24, No. 12. pp. 1676-1685.
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T2 - A comparative study with three commercial dental ceramics

AU - Lazar, Dolores R R

AU - Bottino, Marco C.

AU - Özcan, Mutlu

AU - Valandro, Luiz Felipe

AU - Amaral, Regina

AU - Ussui, Valter

AU - Bressiani, Ana H A

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N2 - Objectives: (1) To synthesize 3 mol% yttria-stabilized zirconia (3Y-TZP) powders via coprecipitation route, (2) to obtain zirconia ceramic specimens, analyze surface characteristics, and mechanical properties, and (3) to compare the processed material with three reinforced dental ceramics. Methods: A coprecipitation route was used to synthesize a 3 mol% yttria-stabilized zirconia ceramic processed by uniaxial compaction and pressureless sintering. Commercially available alumina or alumina/zirconia ceramics, namely Procera AllCeram (PA), In-Ceram Zirconia Block (CAZ) and In-Ceram Zirconia (IZ) were chosen for comparison. All specimens (6 mm × 5 mm × 5 mm) were polished and ultrasonically cleaned. Qualitative phase analysis was performed by XRD and apparent densities were measured on the basis of Archimedes principle. Ceramics were also characterized using SEM, TEM and EDS. The hardness measurements were made employing Vickers hardness test. Fracture toughness (KIC) was calculated. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey's test (α = 0.05). Results: ANOVA revealed that the Vickers hardness (p <0.0001) and fracture toughness (p <0.0001) were affected by the ceramic materials composition. It was confirmed that the PA ceramic was constituted of a rhombohedral alumina matrix, so-called α-alumina. Both CAZ and IZ ceramics presented tetragonal zirconia and α-alumina mixture of phases. The SEM/EDS analysis confirmed the presence of aluminum in PA ceramic. In the IZ and CAZ ceramics aluminum, zirconium and cerium in grains involved by a second phase containing aluminum, silicon and lanthanum were identified. PA showed significantly higher mean Vickers hardness values (HV) (18.4 ± 0.5 GPa) compared to vitreous CAZ (10.3 ± 0.2 GPa) and IZ (10.6 ± 0.4 GPa) ceramics. Experimental Y-TZP showed significantly lower results than that of the other monophased ceramic (PA) (p <0.05) but it showed significantly higher fracture toughness (6.0 ± 0.2 MPa m1/2) values when compared to the other tested ceramics (p <0.05). Significance: The coprecipitation method used to synthesize zirconia powders and the adopted ceramic processing conditions led to ceramics with mechanical properties comparable to commercially available reinforced ceramic materials.

AB - Objectives: (1) To synthesize 3 mol% yttria-stabilized zirconia (3Y-TZP) powders via coprecipitation route, (2) to obtain zirconia ceramic specimens, analyze surface characteristics, and mechanical properties, and (3) to compare the processed material with three reinforced dental ceramics. Methods: A coprecipitation route was used to synthesize a 3 mol% yttria-stabilized zirconia ceramic processed by uniaxial compaction and pressureless sintering. Commercially available alumina or alumina/zirconia ceramics, namely Procera AllCeram (PA), In-Ceram Zirconia Block (CAZ) and In-Ceram Zirconia (IZ) were chosen for comparison. All specimens (6 mm × 5 mm × 5 mm) were polished and ultrasonically cleaned. Qualitative phase analysis was performed by XRD and apparent densities were measured on the basis of Archimedes principle. Ceramics were also characterized using SEM, TEM and EDS. The hardness measurements were made employing Vickers hardness test. Fracture toughness (KIC) was calculated. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey's test (α = 0.05). Results: ANOVA revealed that the Vickers hardness (p <0.0001) and fracture toughness (p <0.0001) were affected by the ceramic materials composition. It was confirmed that the PA ceramic was constituted of a rhombohedral alumina matrix, so-called α-alumina. Both CAZ and IZ ceramics presented tetragonal zirconia and α-alumina mixture of phases. The SEM/EDS analysis confirmed the presence of aluminum in PA ceramic. In the IZ and CAZ ceramics aluminum, zirconium and cerium in grains involved by a second phase containing aluminum, silicon and lanthanum were identified. PA showed significantly higher mean Vickers hardness values (HV) (18.4 ± 0.5 GPa) compared to vitreous CAZ (10.3 ± 0.2 GPa) and IZ (10.6 ± 0.4 GPa) ceramics. Experimental Y-TZP showed significantly lower results than that of the other monophased ceramic (PA) (p <0.05) but it showed significantly higher fracture toughness (6.0 ± 0.2 MPa m1/2) values when compared to the other tested ceramics (p <0.05). Significance: The coprecipitation method used to synthesize zirconia powders and the adopted ceramic processing conditions led to ceramics with mechanical properties comparable to commercially available reinforced ceramic materials.

KW - Alumina

KW - Dental ceramics

KW - Fracture toughness

KW - Zirconia

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