Microstructural changes produced by abrading Y-TZP in presintered and sintered conditions

Monaco, Carlo; Tucci, A.; Esposito, L.; Scotti, Roberto

doi:10.1016/j.jdent.2012.06.009

Cited by 72 publications

(87 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This finding is supported by morphological SEM analysis that showed no marked cracks, and EDX analysis that revealed the presence of impacted alumina particles only in group II. Our results were not in agreement with Monaco et al, 33 who found a lattice distortion of the tetragonal phase, as evidenced by the increase in (0 0 2) peak intensity and simultaneous decrease in that of the (2 0 0) peak. Since the ratio of C2 before sintering was not changed after sintering, despite the use of grit paper for polishing, and the ratio of other groups was the same as the control despite the use of air abrasion, therefore, we can state that all the groups abraded before were approximately free of residual stresses, as most of the stress that could be generated as a result of air abrasion was released after sintering.…”

Section: Discussioncontrasting

confidence: 99%

“…This study showed that abrasion before sintering yielded significantly higher surface roughness values than abrasion after sintering. This was in agreement with Monaco et al 33 who reported that the Ra values of the samples treated before sintering were higher than those of samples treated after sintering, and the Ra values of all abraded groups were higher than that of the control group. This may be due to the impact energy of abrasive particles on soft presintered zirconia, which lead to change in surface morphology.…”

Section: Discussionsupporting

confidence: 93%

“…This was in agreement with studies that stated that the samples abraded before sintering have blunt and melted-round surfaces, whereas sandblasting after sintering showed surface with coarse and needle-like rough surfaces. 33,38 The crystalline structures of the presintered samples by XRD showed that the relative monoclinic phase of C1 was 0.15%, after surface polishing with silicon carbide paper; relative monoclinic phase of C2 became 0.17%. After sintering, the relative monoclinic phase of group I was 0.01%.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and Morphological Evaluation of Presintered Zirconia following Different Surface Treatments

Skienhe

Habchi

Ounsi

et al. 2018

The Journal of Contemporary Dental Practice

View full text Add to dashboard Cite

Aim:The aim of this study was to evaluate the effect of different surface treatments on roughness, grain size, and phase transformation of presintered zirconia. Materials and methods:Surface treatments included airborne particle abrasion (APA) before and after sintering with different particles shape, size, and pressure (50 μm Al 2 O 3 , 50 μm glass beads, and ceramic powder). Thirty-five square-shaped presintered yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic slabs (Zenostar ZR bridge, Wieland) were prepared (4 mm height × 10 mm width × 10 mm length) and polished with silicon carbide grit papers #800, 1000, 1200, 1500, and 2000 to ensure identical initial roughness. Specimens were divided into five groups according to surface treatment: group I (control): no surface treatment; group II: APA 50 μm Al 2 O 3 after sintering; group III: APA 50 μm Al 2 O 3 particles before sintering; group IV: APA 50 μm glass bead particles before sintering; and group V: APA ceramic powder before sintering. Specimens were analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) analyses, and tested for shear bond strength (SBS). Data were statistically analyzed using one-way analysis of variance (ANOVA) followed by post hoc tests for multiple comparisons Tukey's test (α ≥ 0.05). Results: Air abrasion before sintering significantly increased the surface roughness when compared with groups I and III. The highest tetragonal to monoclinic (t-m) phase transformation (0.07%) was observed in group III, and a reverse transformation was observed in presintered groups (0.01%). Regarding bond strength, there was a significant difference between APA procedures pre-and postsintering. Structural and Morphological Evaluation of Presintered Conclusion:Air abrasion before sintering is a valuable method for increasing surface roughness and SBS. The abrasive particles' size and type used before sintering had a little effect on phase transformation.Clinical significance: Air abrasion before sintering could be supposed to be an alternative surface treatment method to air abrasion after sintering.

show abstract

Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Structural and Morphological Evaluation of Presintered Zirconia following Different Surface Treatments

Skienhe

Habchi

Ounsi

et al. 2018

The Journal of Contemporary Dental Practice

View full text Add to dashboard Cite

show abstract

“…Although the transformation to monoclinic phase toughens the zirconia surface, it can have a negative impact on the mechanical stability of prostheses, depending on the material's ability to prevent or retard the propagation of cracks, becoming a material with lower reliability 11,14) . A positive or negative effect after grinding depends on the t→m volume percentage transformation and on the conversion's metastability 8,15,16) . Each manufacturer recommends a different surface treatment, including annealing, that would act as a "regenerative" firing for reestablishment of the tetragonal lattice 17,18) .…”

Section: Introductionmentioning

confidence: 99%

“…Each manufacturer recommends a different surface treatment, including annealing, that would act as a "regenerative" firing for reestablishment of the tetragonal lattice 17,18) . Once the adjustment procedures are finished, the regeneration firing might induce reverse transformation (m→t), returning the Y-TZP to a metastable tetragonal phase zirconia that, although less resistant, is more stable 15) . This heat treatment has already been studied, but still deserves attention because of the disagreement between protocols suggested by different authors and due to microstructural characterization after regeneration firing that has not been fully understood yet [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

et al. 2017

View full text Add to dashboard Cite

This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (Lava TM and Ice Zirkon) were divided: Y-TZP pre-sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000°C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD). XRD showed that pre-sintered specimens contained tetragonal and monoclinic phases, while groups C and R showed tetragonal, cubic and monoclinic phases. After grinding, the cubic phase was eliminated in all groups. Annealing (DGR and WGR) resulted in only tetragonal phase. SEM showed semi-circular cracks after grinding and homogenization of particles after annealing. After grinding, surfaces show tetragonal and monoclinic phases and R can be assumed to be necessary prior to porcelain layering when grinding is performed.

show abstract

Effect of micro blasting process parameters on 3D surface topography and surface properties of zirconia (Y‐TZP) ceramics

Yetik

Yavuzyegit

Avcu

et al. 2020

Engineering Reports

View full text Add to dashboard Cite

The present study aims to examine the effects of operational parameters on the surface topography and wear mechanisms of monolithic and conventional yttria‐stabilized zirconia (Y‐TZP) ceramics in the micro blasting process, performed under various acceleration pressures (1.5–3 bar), particle impact angles (30°–90°), and erodent particle sizes (50–460 μm). Three‐dimensional (3D) surface topography, surface roughness, and surface morphology of micro‐blasted specimens were analyzed by using non‐contact optical profilometry and SEM‐EDS. The micro blasting characteristics of both Y‐TZP were similar that increased blasting pressure and erodent particle size increased surface roughness. Erosion rate increased with increasing blasting pressure, whereas it decreased with increasing erodent particle size. Particle size was the most effective parameter on changing surface topography, while the particle impact angle had no distinct effect on the erosion rate, surface roughness, and surface topography of Y‐TZP ceramics. SEM‐EDS analyses showed that the primary wear mechanism during micro blasting was micro‐cutting with a substantial amount of embedded particles on the material's surface.

show abstract

Microstructural changes produced by abrading Y-TZP in presintered and sintered conditions

Cited by 72 publications

References 36 publications

Structural and Morphological Evaluation of Presintered Zirconia following Different Surface Treatments

Structural and Morphological Evaluation of Presintered Zirconia following Different Surface Treatments

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

Effect of micro blasting process parameters on 3D surface topography and surface properties of zirconia (Y‐TZP) ceramics

Contact Info

Product

Resources

About