Effects of acid treatment on dental zirconia

An in vitro study

Haifeng Xie, Shuping Shen, Mengke Qian, Feimin Zhang, Chen Chen, Franklin Chi Meng Tay

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The aim of this study was to evaluate the effects of hydrofluoric (HF) acid, acetic acid, and citric acid treatments on the physical properties and structure of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) at ambient temperature. In total, 110 bar-shaped zirconia specimens were randomly assigned to 11 groups. The specimens in the control group (C) received no surface treatment, while those in the Cage group were hydrothermally aged at 134°C and 0.2 MPa for 20 h. Ten specimens each were immersed at ambient temperature in 5% and 40% HF acid for 2 h (40HF0), 1 day (5HF1, 40HF1), and 5 days (5HF5, 40HF5), while 10 each were immersed at ambient temperature in 10% acetic acid and 20% citric acid for 7 (AC7, CI7) and 14 days (AC14, CI14). X-ray diffraction (XRD) was used to quantitatively estimate the monoclinic phase. Furthermore, flexural strength, surface roughness, and surface Vickers hardness were measured after treatment. Scanning electron microscopy (SEM) was used to characterize the surface morphology. The Cage group specimens exhibited an increased monoclinic phase and flexural strength. Furthermore, 40% HF acid immersion decreased the flexural strength and surface hardness and deteriorated the surface finish, while 5% HF acid immersion only decreased the surface hardness. All the HF acid-immersed specimens showed an etched surface texture on SEM observations, while the other groups did not. These findings suggest that the treatment of Y-TZP with 40% HF acid at ambient temperature causes potential damage, while treatment with 5% HF acid, acetic acid, and citric acid is safe.

Original languageEnglish (US)
Article numbere0136263
JournalPloS one
Volume10
Issue number8
DOIs
StatePublished - Aug 24 2015

Fingerprint

hydrofluoric acid
Hydrofluoric Acid
acid treatment
in vitro studies
Tooth
teeth
Acids
ambient temperature
Hardness
Citric Acid
citric acid
Acetic Acid
Bending strength
acetic acid
hardness
Temperature
Polycrystals
Immersion
Electron Scanning Microscopy
cages

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Effects of acid treatment on dental zirconia : An in vitro study. / Xie, Haifeng; Shen, Shuping; Qian, Mengke; Zhang, Feimin; Chen, Chen; Tay, Franklin Chi Meng.

In: PloS one, Vol. 10, No. 8, e0136263, 24.08.2015.

Research output: Contribution to journalArticle

Xie, Haifeng ; Shen, Shuping ; Qian, Mengke ; Zhang, Feimin ; Chen, Chen ; Tay, Franklin Chi Meng. / Effects of acid treatment on dental zirconia : An in vitro study. In: PloS one. 2015 ; Vol. 10, No. 8.
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abstract = "The aim of this study was to evaluate the effects of hydrofluoric (HF) acid, acetic acid, and citric acid treatments on the physical properties and structure of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) at ambient temperature. In total, 110 bar-shaped zirconia specimens were randomly assigned to 11 groups. The specimens in the control group (C) received no surface treatment, while those in the Cage group were hydrothermally aged at 134°C and 0.2 MPa for 20 h. Ten specimens each were immersed at ambient temperature in 5{\%} and 40{\%} HF acid for 2 h (40HF0), 1 day (5HF1, 40HF1), and 5 days (5HF5, 40HF5), while 10 each were immersed at ambient temperature in 10{\%} acetic acid and 20{\%} citric acid for 7 (AC7, CI7) and 14 days (AC14, CI14). X-ray diffraction (XRD) was used to quantitatively estimate the monoclinic phase. Furthermore, flexural strength, surface roughness, and surface Vickers hardness were measured after treatment. Scanning electron microscopy (SEM) was used to characterize the surface morphology. The Cage group specimens exhibited an increased monoclinic phase and flexural strength. Furthermore, 40{\%} HF acid immersion decreased the flexural strength and surface hardness and deteriorated the surface finish, while 5{\%} HF acid immersion only decreased the surface hardness. All the HF acid-immersed specimens showed an etched surface texture on SEM observations, while the other groups did not. These findings suggest that the treatment of Y-TZP with 40{\%} HF acid at ambient temperature causes potential damage, while treatment with 5{\%} HF acid, acetic acid, and citric acid is safe.",
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