Effect of low-temperature degradation on the mechanical and microstructural properties of tooth-colored 3Y-TZP ceramics

• The aim of the present study was to evaluate the effects of low-temperature degradation (LTD) induced by autoclaving on the mechanical and microstructural properties of tooth-colored 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP). In total, 162 disc-shaped 3Y-TZP specimens were prepared. Two-thirds of the specimens were shaded by either the infiltration or powder mixing methods while the remaining specimens were used without coloring. The specimens were autoclaved at 134°C for 0, 10, and 100h to induce LTD (n=18 for each group). Chemical compositions were analyzed with X-ray fluorescence spectroscopy. Biaxial flexural strength was measured using a piston-on-three-ball test. The surface fraction and penetration depth of the monoclinic phase were examined using X-ray diffraction and scanning electron microscopy, respectively. The tooth-colored 3Y-TZP specimens contained Fe2O3 and Er2O3 (infiltration technique), and Fe2O3 (powder mixing method) at concentrations of<0.5wt%. The tooth-colored 3Y-TZP had higher strength than the non-colored material after 100h of autoclaving. In terms of surface fraction and penetration depth, the generation of monoclinic phase was significantly lower in the tooth-colored 3Y-TZP than in the non-colored material. The tooth-colored 3Y-TZP possessed equivalent biaxial flexural strength to that of the non-colored material and higher resistance to LTD regardless of the coloring technique (infiltration technique or powder mixing method) when the coloring pigments were contained at concentrations used in the present study. © 2015 Elsevier Ltd.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Odontologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Dentistry (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Coloring

Low-temperature degradation

Phase transformation

Weibull analysis

Zirconia

Bending strength

Chemical analysis

Fluorescence spectroscopy

Mixing

Phase transitions

Scanning electron microscopy

Strength of materials

Temperature

X ray diffraction

Yttria stabilized zirconia

3mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP)

Bi-axial flexural strength

Infiltration techniques

Low-temperature degradations

Micro-structural properties

Powder mixing methods

X ray fluorescence spectroscopy

Yttrium alloys

erbium

ferric oxide

yttrium

zirconium oxide

Article

autoclave

ceramics

chemical composition

chemical structure

color

degradation

low temperature

priority journal

X ray fluorescence

Coloring

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