Improvement of mechanical properties of Y-TZP by thermal annealing with monoclinic zirconia nanoparticle coating

Research output: Contribution to journalArticle

Abstract

Objective: To assess whether a thermal annealing with a monoclinic zirconia (mZrO 2 ) nanoparticle coating can improve the reliability of sandblasted yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and maintain its mechanical strength. Methods: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were sintered and surface-treated as follows: AS (as sintered, with no treatment); SB (sandblasting); SB-TA (sandblasting followed by thermal annealing at 1000 °C); and SB-mZr-TA (sandblasting followed by thermal annealing at 1000 °C with the mZrO 2 nanoparticle coating). The mZrO 2 nanoparticles of 21 nm in size were prepared by a hydrothermal method, and coated onto Y-TZP sintered disks as a 5 g/L ethanol dispersion. Biaxial flexural strength (S) was measured using the piston-on-three-ball test, and reliability was evaluated by the Weibull modulus (m). Results: Biaxial flexural tests showed a significant increase in the strength of Group SB (S SB = 1445 ± 191 MPa) compared with Group AS (S AS = 1071 ± 112 MPa). The thermal annealing improved the reliabilities of the sandblasted Y-TZP (m SB-TA = 20.14 and m SB- m Zr-TA = 21.33), as compared with Group SB (m SB = 7.77). However, the conventional thermal annealing without the mZrO 2 coating caused a significant decrease in the strength of sandblasted Y-TZP (S SB-TA = 1273 ± 65 MPa). Importantly, the mZrO 2 coating prevented the decrease in the strength caused by conventional thermal annealing (S SB- m Zr-TA = 1379 ± 65 MPa). Significance: The thermal annealing with the mZrO 2 nanoparticle coating can improve the reliability of sandblasted Y-TZP and maintain its mechanical strength, which would otherwise be decreased by the conventional annealing process.

Original languageEnglish
JournalDental Materials
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Yttria stabilized zirconia
Polycrystals
Zirconia
Nanoparticles
Hot Temperature
Annealing
Coatings
Mechanical properties
Strength of materials
zirconium oxide
yttria stabilized tetragonal zirconia
Bending strength
Pistons
Tooth
Ethanol

Keywords

  • Biaxial flexural strength
  • Monoclinic phase
  • Thermal annealing
  • Yttria-stabilized tetragonal zirconia polycrystals

ASJC Scopus subject areas

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

Cite this

@article{991d4141b7fa401bb490b1583aa55691,
title = "Improvement of mechanical properties of Y-TZP by thermal annealing with monoclinic zirconia nanoparticle coating",
abstract = "Objective: To assess whether a thermal annealing with a monoclinic zirconia (mZrO 2 ) nanoparticle coating can improve the reliability of sandblasted yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and maintain its mechanical strength. Methods: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were sintered and surface-treated as follows: AS (as sintered, with no treatment); SB (sandblasting); SB-TA (sandblasting followed by thermal annealing at 1000 °C); and SB-mZr-TA (sandblasting followed by thermal annealing at 1000 °C with the mZrO 2 nanoparticle coating). The mZrO 2 nanoparticles of 21 nm in size were prepared by a hydrothermal method, and coated onto Y-TZP sintered disks as a 5 g/L ethanol dispersion. Biaxial flexural strength (S) was measured using the piston-on-three-ball test, and reliability was evaluated by the Weibull modulus (m). Results: Biaxial flexural tests showed a significant increase in the strength of Group SB (S SB = 1445 ± 191 MPa) compared with Group AS (S AS = 1071 ± 112 MPa). The thermal annealing improved the reliabilities of the sandblasted Y-TZP (m SB-TA = 20.14 and m SB- m Zr-TA = 21.33), as compared with Group SB (m SB = 7.77). However, the conventional thermal annealing without the mZrO 2 coating caused a significant decrease in the strength of sandblasted Y-TZP (S SB-TA = 1273 ± 65 MPa). Importantly, the mZrO 2 coating prevented the decrease in the strength caused by conventional thermal annealing (S SB- m Zr-TA = 1379 ± 65 MPa). Significance: The thermal annealing with the mZrO 2 nanoparticle coating can improve the reliability of sandblasted Y-TZP and maintain its mechanical strength, which would otherwise be decreased by the conventional annealing process.",
keywords = "Biaxial flexural strength, Monoclinic phase, Thermal annealing, Yttria-stabilized tetragonal zirconia polycrystals",
author = "Masahiro Okada and Hiroaki Taketa and Emilio satoshi Hara and Yasuhiro Torii and Masao Irie and Takuya Matsumoto",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.dental.2019.04.002",
language = "English",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier Science",

}

TY - JOUR

T1 - Improvement of mechanical properties of Y-TZP by thermal annealing with monoclinic zirconia nanoparticle coating

AU - Okada, Masahiro

AU - Taketa, Hiroaki

AU - Hara, Emilio satoshi

AU - Torii, Yasuhiro

AU - Irie, Masao

AU - Matsumoto, Takuya

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Objective: To assess whether a thermal annealing with a monoclinic zirconia (mZrO 2 ) nanoparticle coating can improve the reliability of sandblasted yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and maintain its mechanical strength. Methods: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were sintered and surface-treated as follows: AS (as sintered, with no treatment); SB (sandblasting); SB-TA (sandblasting followed by thermal annealing at 1000 °C); and SB-mZr-TA (sandblasting followed by thermal annealing at 1000 °C with the mZrO 2 nanoparticle coating). The mZrO 2 nanoparticles of 21 nm in size were prepared by a hydrothermal method, and coated onto Y-TZP sintered disks as a 5 g/L ethanol dispersion. Biaxial flexural strength (S) was measured using the piston-on-three-ball test, and reliability was evaluated by the Weibull modulus (m). Results: Biaxial flexural tests showed a significant increase in the strength of Group SB (S SB = 1445 ± 191 MPa) compared with Group AS (S AS = 1071 ± 112 MPa). The thermal annealing improved the reliabilities of the sandblasted Y-TZP (m SB-TA = 20.14 and m SB- m Zr-TA = 21.33), as compared with Group SB (m SB = 7.77). However, the conventional thermal annealing without the mZrO 2 coating caused a significant decrease in the strength of sandblasted Y-TZP (S SB-TA = 1273 ± 65 MPa). Importantly, the mZrO 2 coating prevented the decrease in the strength caused by conventional thermal annealing (S SB- m Zr-TA = 1379 ± 65 MPa). Significance: The thermal annealing with the mZrO 2 nanoparticle coating can improve the reliability of sandblasted Y-TZP and maintain its mechanical strength, which would otherwise be decreased by the conventional annealing process.

AB - Objective: To assess whether a thermal annealing with a monoclinic zirconia (mZrO 2 ) nanoparticle coating can improve the reliability of sandblasted yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and maintain its mechanical strength. Methods: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were sintered and surface-treated as follows: AS (as sintered, with no treatment); SB (sandblasting); SB-TA (sandblasting followed by thermal annealing at 1000 °C); and SB-mZr-TA (sandblasting followed by thermal annealing at 1000 °C with the mZrO 2 nanoparticle coating). The mZrO 2 nanoparticles of 21 nm in size were prepared by a hydrothermal method, and coated onto Y-TZP sintered disks as a 5 g/L ethanol dispersion. Biaxial flexural strength (S) was measured using the piston-on-three-ball test, and reliability was evaluated by the Weibull modulus (m). Results: Biaxial flexural tests showed a significant increase in the strength of Group SB (S SB = 1445 ± 191 MPa) compared with Group AS (S AS = 1071 ± 112 MPa). The thermal annealing improved the reliabilities of the sandblasted Y-TZP (m SB-TA = 20.14 and m SB- m Zr-TA = 21.33), as compared with Group SB (m SB = 7.77). However, the conventional thermal annealing without the mZrO 2 coating caused a significant decrease in the strength of sandblasted Y-TZP (S SB-TA = 1273 ± 65 MPa). Importantly, the mZrO 2 coating prevented the decrease in the strength caused by conventional thermal annealing (S SB- m Zr-TA = 1379 ± 65 MPa). Significance: The thermal annealing with the mZrO 2 nanoparticle coating can improve the reliability of sandblasted Y-TZP and maintain its mechanical strength, which would otherwise be decreased by the conventional annealing process.

KW - Biaxial flexural strength

KW - Monoclinic phase

KW - Thermal annealing

KW - Yttria-stabilized tetragonal zirconia polycrystals

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U2 - 10.1016/j.dental.2019.04.002

DO - 10.1016/j.dental.2019.04.002

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C2 - 31006551

AN - SCOPUS:85064312057

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

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