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Effects of Acid Treatment on Dental Zirconia: An In Vitro Study.

Xie H, Shen S, Qian M, Zhang F, Chen C, Tay FR - PLoS ONE (2015)

Bottom Line: 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.The Cage group specimens exhibited an increased monoclinic phase and flexural strength.All the HF acid-immersed specimens showed an etched surface texture on SEM observations, while the other groups did not.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.

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.

No MeSH data available.


Related in: MedlinePlus

X-ray diffraction (XRD) patterns of specimens from the 11 groups.The m-phase of pure zirconium dioxide is detected at 27.5–28.5° 2θ (arrow) in the low-temperature degradation (LTD) group only. No m-ZrO2 is detected in the other groups. The left panel shows the XRD patterns at 27–33° 2θ.
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pone.0136263.g003: X-ray diffraction (XRD) patterns of specimens from the 11 groups.The m-phase of pure zirconium dioxide is detected at 27.5–28.5° 2θ (arrow) in the low-temperature degradation (LTD) group only. No m-ZrO2 is detected in the other groups. The left panel shows the XRD patterns at 27–33° 2θ.

Mentions: As shown in Fig 3, XRD only detected m-ZrO2 in the Cage group specimens, while no m-ZrO2 was found in the other groups. The m-ZrO2 contents could be sequenced according to quantified data from XRD as follows: Cage (19.8 wt%) > 40HF5, 40HF1, 40HF0, 5HF5, 5HF1, AC14, CI14, AC7, CI7, and C (0 wt%).


Effects of Acid Treatment on Dental Zirconia: An In Vitro Study.

Xie H, Shen S, Qian M, Zhang F, Chen C, Tay FR - PLoS ONE (2015)

X-ray diffraction (XRD) patterns of specimens from the 11 groups.The m-phase of pure zirconium dioxide is detected at 27.5–28.5° 2θ (arrow) in the low-temperature degradation (LTD) group only. No m-ZrO2 is detected in the other groups. The left panel shows the XRD patterns at 27–33° 2θ.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4547786&req=5

pone.0136263.g003: X-ray diffraction (XRD) patterns of specimens from the 11 groups.The m-phase of pure zirconium dioxide is detected at 27.5–28.5° 2θ (arrow) in the low-temperature degradation (LTD) group only. No m-ZrO2 is detected in the other groups. The left panel shows the XRD patterns at 27–33° 2θ.
Mentions: As shown in Fig 3, XRD only detected m-ZrO2 in the Cage group specimens, while no m-ZrO2 was found in the other groups. The m-ZrO2 contents could be sequenced according to quantified data from XRD as follows: Cage (19.8 wt%) > 40HF5, 40HF1, 40HF0, 5HF5, 5HF1, AC14, CI14, AC7, CI7, and C (0 wt%).

Bottom Line: 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.The Cage group specimens exhibited an increased monoclinic phase and flexural strength.All the HF acid-immersed specimens showed an etched surface texture on SEM observations, while the other groups did not.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.

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.

No MeSH data available.


Related in: MedlinePlus