Mechanical Properties of Dental Zirconia Ceramics Changed with Sandblasting and Heat Treatment

Sato, Hideo; Yamada, Kiyotaka; Pezzotti, Giuseppe; Nawa, Masahiro; Ban, Seiji

doi:10.4012/dmj.27.408

Cited by 224 publications

(221 citation statements)

References 30 publications

Supporting

Mentioning

198

Contrasting

Unclassified

Order By: Relevance

“…TZD values correspond to the protective layer against residual compressive stresses that is directly linked with an increase in the mechanical resistance of zirconia. The variation in the values among the studies can be explained by the chemical and structural difference, such as concentration, distribution and type of the oxide stabilizer (Sundh and Sjogren, 2006;Sato et al, 2008) and grain size of zirconia materials (Kosmac et al, 1999;Kosmac et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Özcan

Melo

Souza

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

104

View full text Add to dashboard Cite

This study evaluated the effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading. Disc-shaped zirconia specimens (Ø: 15mm, thickness: 1.2mm) (N=32) were submitted to one of the air-particle abrasion protocols (n=8 per group): (a) 50 m Al2O3 particles, (b) 110 m Al2O3 particles coated with silica (Rocatec Plus), (c) 30 m Al2O3 particles coated with silica (CoJet Sand) for 20s at 2.8bar pressure. Control group received no air-abrasion. All specimens were initially cyclic loaded (×20,000, 50N, 1Hz) in water at 37°C and then subjected to biaxial flexural strength testing where the conditioned surface was under tension. Zirconia surfaces were characterized and roughness was measured with 3D surface profilometer. Phase transformation from tetragonal to monoclinic was determined by Raman spectroscopy. The relative amount of transformed monoclinic zirconia (FM) and transformed zone depth (TZD) were measured using XRD. The data (MPa) were analyzed using ANOVA, Tukey's tests and Weibull modulus (m) were calculated for each group (95% CI). The biaxial flexural strength (MPa) of CoJet treated group (1266.3±158(A)) was not significantly different than that of Rocatec Plus group (1179±216.4(A,B)) but was significantly higher than the other groups (Control: 942.3±74.6(C); 50 m Al2O3: 915.2±185.7(B,C)). Weibull modulus was higher for control (m=13.79) than those of other groups (m=4.95, m=5.64, m=9.13 for group a, b and c, respectively). Surface roughness (Ra) was the highest with 50 m Al2O3 (0.261 m) than those of other groups (0.15-0.195 m). After all air-abrasion protocols, FM increased (15.02%-19.25%) compared to control group (11.12%). TZD also showed increase after air-abrasion protocols (0.83-1.07 m) compared to control group (0.59 m). Air-abrasion protocols increased the roughness and monoclinic phase but in turn abrasion with 30 m Al2O3 particles coated with silica has increased the biaxial flexural strength of the tested zirconia. 942.3±74.6 C ; 50 µm Al 2 O 3 : 915.2±185.7 B,C ). Weibull modulus was higher for control (m=13.79) than those of other groups (m=4. 95, m=5.64, m=9.13 for group a, b and c, respectively). Surface roughness (R a ) was the highest with 50 µm Al 2 O 3 (0.261 µm) than those of other groups (0.15-0.195 µm). After all air-abrasion protocols, F M increased (15.02-19.25%) compared to control group (11.12%). TZD also showed increase after air-abrasion protocols (0.83-1.07 µm) compared to control group (0.59 µm). Air-abrasion protocols increased the roughness and monoclinic phase but in turn abrasion with 30 µm Al 2 O 3 particles coated with silica has increased the biaxial flexural strength of the tested zirconia.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Özcan

Melo

Souza

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

104

View full text Add to dashboard Cite

show abstract

“…The roughness mean value of the Y-TZP surface without SiO x film is (380 ± 32) nm. Then, one can conclude that no significant modifications in R a were observed once these values are much smaller than those achieved by sandblasting technique 16 .…”

Section: Profilometrymentioning

confidence: 94%

“…The increase of the bond strength when zirconia surface is sandblasted with alumina or silica particle associated with zirconia primer is reported elsewhere 11,14,16 as achieved by sandblasting 16 , this method presents as efficient way to improve the adhesion properties between Y-TZP and resin cement without damage the Y-TZP surface, i.e. the bond strength is based mainly by chemical bond.…”

Section: Shear Testing Optical Microscopy and Scanning Electron Micrmentioning

confidence: 99%

Deposition of SiOx thin films on Y-TZP by reactive magnetron sputtering: influence of plasma parameters on the adhesion properties between Y-TZP and resin cement for application in dental prosthesis

et al. 2011

View full text Add to dashboard Cite

In this paper SiO x thin films were deposited on Y-TZP ceramics by reactive magnetron sputtering technique in order to improve the adhesion properties between Y-TZP and resin cement for applications in dental prosthesis. For fixed cathode voltage, target current, working pressure and target-to-substrate distance, SiO x thin films were deposited at different oxygen concentrations in the Ar+O 2 plasma forming gas. After deposition processes, SiO x thin films were characterized by profilometry, energy dispersive spectroscopy (EDS), optical microscopy and scanning electron microscopy (SEM). Adhesion properties between Y-TZP and resin cement were evaluated by shear testing. Results indicate that films deposited at 20%O 2 increased the bond strength to (32.8 ± 5.4) MPa. This value has not been achieved by traditional methods.

show abstract

“…After airparticle abrasion, grinding or polishing the heat treatment of the zirconia specimen decreased the flexural strength of the material [28,29]. This was explained by the compressive stresses caused by surface treatment such as sandblasting were released in the heat treatment and the mean flexural strength was influenced by sandblasting-induced defects in the material.…”

Section: Discussionmentioning

confidence: 97%

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

Hjerppe

Fröberg

Lassila

et al. 2010

Silicon

View full text Add to dashboard Cite

Purpose In dental practice, zirconia substructures for crowns and fixed partial dentures are veneered with feldspathic porcelain for better aesthetical properties. The purpose of this study was to evaluate the effect of heat treatment during the veneering process on the mechanical properties of zirconia. Methods 105 zirconia (ICE Zirkon, Zirkonzahn, Italy) disc shaped specimens were divided into seven groups (n=15/ group) and sintered at 1500°C. Control specimens (group 1) were left as such. Specimens in the study groups were: 2) one heat treatment in a porcelain firing furnace; 3) a heat treatment with two firing cycles; 4) one heat treatment with a thin coating of feldspathic glazing on the tension side; 5) two heat treatments with a thin coating of feldspathic wash and glazing on the tension side; 6) one heat treatment with a thin coating of feldspathic glazing on the compression side; 7) two heat treatments with a thin coating of feldspathic wash and glazing on the compression side. Biaxial flexural strength and surface microhardness of the specimens (diameter 19 mm, thickness 1.2 mm) were measured. The effect of heat treatment and feldspathic glazing on the phase transformations of zirconia was determined by XRD-analysis. The data were calculated using ANOVA-analysis.Results Repeated heat treatment did not influence the mechanical properties of zirconia (p>0.05). No difference (p>0.05) was found in terms of the surface microhardness between the groups. Some transformation from the tetragonal to the monoclinic phase was seen on the surface of the specimens after heat treatment and feldspathic glazing coating. Conclusions Repeated heat treatment does not affect the strength of zirconia milled in the green-stage form.

show abstract

Mechanical Properties of Dental Zirconia Ceramics Changed with Sandblasting and Heat Treatment

Cited by 224 publications

References 30 publications

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Deposition of SiOx thin films on Y-TZP by reactive magnetron sputtering: influence of plasma parameters on the adhesion properties between Y-TZP and resin cement for application in dental prosthesis

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

Contact Info

Product

Resources

About