Phase transformation and subsurface damage in 3Y-TZP after sandblasting

Chintapalli, Ravi Kiran; Marro, Fernando García; Jiménez-Piqué, Emilio; Anglada, M.

doi:10.1016/j.dental.2013.03.005

Cited by 135 publications

(116 citation statements)

References 27 publications

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“…In sandblasted samples, this characterization was performed after exposure to artificial degradation, since the non-aged state had been characterized in previous works (Chintapalli et al, 2013). EDS was performed on trenches to evaluate the thickness of the co-doped layer.…”

Section: Fib -Sem -Eds Characterizationsmentioning

confidence: 99%

Surface roughened zirconia: towards hydrothermal stability

Camposilvan

Flamant

Anglada

2015

Journal of the Mechanical Behavior of Biomedical Materials

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Surface roughness is needed in several yttria-stabilized zirconia components used in restorative dentistry for osseointegration or adhesion purposes. This can be achieved by different treatments, which may also modify the microstructure of the surface. Among them, sandblasting and chemical etching are widely used, but their effect on hydrothermal aging of zirconia is not fully understood. In the present work, the zirconia long-term stability of rough surfaces prepared by these techniques is analyzed and a method is proposed for preventing hydrothermal aging while maintaining the original surface appearance and mechanical properties. The method involves pressure infiltration of a Cerium salt solution on the roughened surfaces followed by a thermal treatment. The solution, trapped by surface defects and small pores, is decomposed during thermal treatment into Cerium oxide, which is diffused at high temperature, obtaining Ce co-doping in the near-surface region.In addition, the microstructural changes induced in the near-surface by sandblasting or chemical etching are removed by the thermal treatment together with surface defects. No color modification was observed and the final roughness parameters were in the range of existing implants of proved good osseointegration. The aging resistance of Ce co-doped materials was strongly enhanced, showing the absence of aging after artificial degradation, increasing in this way the surface mechanical integrity.The proposed treatment is easily applicable to the current manufacturing procedures of zirconia dental posts, abutments, crowns and dentures, representing a solution to hydrothermal aging in these and other biomedical applications.

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Section: Fib -Sem -Eds Characterizationsmentioning

confidence: 99%

Surface roughened zirconia: towards hydrothermal stability

Camposilvan

Flamant

Anglada

2015

Journal of the Mechanical Behavior of Biomedical Materials

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“…This technique involves hitting the ceramic surface with Al 2 O 3 or Si-coated Al 2 O 3 particles at high speed, thereby creating a roughened surface with improved wettability (7). Moreover, due to the metastability, the tetragonal phase of Y-TZP ceramics is prone to martensitic t→m transformation under the stresses produced by air abrasion (2) and this mechanism is able to improve the mechanical properties of the material (8,9). Many published studies analyzed the effect of shape, size and chemical composition of the airabrasion particles on the surface of Y-TZP dental ceramics (9,10).…”

Section: Introductionmentioning

confidence: 99%

“…Y-TZP dental ceramics are composed by a metastable tetragonal phase (t), retained at room temperature by careful control of grain size (<0.5 mm) and stabilizer (Y 2 O 3 ) concentration (2-5 mol%) (1). During stress experience, a tetragonal-monoclinic (t→m) phase transformation takes place at the crack tips under applied stresses, which is accompanied by a volume expansion of about 3-5% (2). This stress-induced t→m phase transformation leads to the development of internal compressive stresses that oppose crack propagation, creating a toughening mechanism that increases the crack propagation strength of the material (3,4).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Conventional and High-Translucency Y-TZP Dental Ceramics Submitted to Air Abrasion

et al. 2017

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This study evaluated the effect of air-abrasion on t→m phase transformation, roughness, topography and the elemental composition of three Y-TZP (Yttria-stabilized tetragonal zirconia polycrystal) dental ceramics: two conventional (Lava Frame and IPS ZirCad) and one with high-translucency (Lava Plus). Plates obtained from sintered blocks of each ceramic were divided into four groups: AS (as-sintered); 30 (air-abrasion with 30 mm Sicoated Al 2 O 3 particles); 50 (air-abrasion with 50 mm Al 2 O 3 particles) and 150 (air-abrasion with 150 mm Al 2 O 3 particles). After the treatments, the plates were submitted to X-ray diffractometry; 3-D profilometry and SEM/EDS. The AS surfaces were composed of Zr and t phases. All treatments produced t→m phase transformation in the ceramics. The diameter of air-abrasion particles influenced the roughness (150>50>30>AS) and the topography. SEM analysis showed that the three treatments produced groove-shaped microretentions on the ceramic surfaces, which increased with the diameter of air-abrasion particles. EDS showed a decrease in Zr content along with the emergence of O and Al elements after air-abrasion. Presence of Si was also detected on the plates air-abraded with 30 mm Si-coated Al 2 O 3 particles. It was concluded that irrespective of the type and diameter of the particles, air-abrasion produced t→m phase transformation, increased the roughness and changed the elemental composition of the three Y-TZP dental ceramics. Lava Plus also behaved similarly to the conventional Y-TZP ceramics, indicating that this high translucency ceramic could be more suitable to build monolithic ceramic restorations in the aesthetic restorative dentistry field.

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“…The reasons for these contradictory conclusions about sandblasting may to be: (1) different types and sizes of blasting particles or levels of injection pressure could have different effects on the zirconia surface; and (2) sandblasting would change some of the crystals on the zirconia surface from tetragonal to monoclinic 24) . In this study, the zirconia surface was not treated because our purpose was to examine the effect of pores on bond strength.…”

Section: Discussionmentioning

confidence: 99%

Shear bond strength of veneering porcelain to porous zirconia

Nakamura¹,

Sugano²,

Usami³

et al. 2014

Dent. Mater. J.

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In this study, two types of porous zirconia and dense zirconia were used. The flexural strength of non-layered zirconia specimens and those of the layered zirconia specimens with veneering porcelain were examined. Furthermore, the shear bond strength of veneering porcelain to zirconia was examined. The flexural strength of the non-layered specimens was 1,220 MPa for dense zirconia and 220 to 306 MPa for porous zirconia. The flexural strength of the layered specimens was 360 MPa for dense zirconia and 132 to 156 MPa for porous zirconia, when a load was applied to the porcelain side. The shear bond strength of porcelain veneered to dense zirconia was 27.4 MPa and that of porcelain veneered to porous zirconia was 33.6 to 35.1 MPa. This suggests that the veneering porcelain bonded strongly to porous zirconia although porous zirconia has a lower flexural strength than dense zirconia.

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Phase transformation and subsurface damage in 3Y-TZP after sandblasting

Cited by 135 publications

References 27 publications

Surface roughened zirconia: towards hydrothermal stability

Surface roughened zirconia: towards hydrothermal stability

Characterization of Conventional and High-Translucency Y-TZP Dental Ceramics Submitted to Air Abrasion

Shear bond strength of veneering porcelain to porous zirconia

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