Flexural strength and fracture toughness of dental core ceramics

Yılmaz, Handan; Aydın, Cemal; Gul, Basak E.

doi:10.1016/s0022-3913(07)60045-6

Cited by 215 publications

(201 citation statements)

References 35 publications

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“…Flexural strength of ceramics could be tested either with three-point test (Guazzato et al, 2005;Papanagiotou e al., 2006), four-point test (Giordano et al, 1995;Thompson, 2000), or biaxial flexural strength tests (piston-on-three-ball) (Guazzato et al, 2004b;Curtis et al, 2006a;Itinoche et al, 2006;Yilmaz et al, 2007). Among all these methods, fabrication of specimens for three-point flexural test can introduce defects that may not present the standard clinical conditions (Kelly, 1995).…”

Section: Discussionmentioning

confidence: 99%

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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

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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.

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Section: Discussionmentioning

confidence: 99%

“…Also, the quality of specimens for this type of test is highly dependent on the superficial finish at the edges (Zeng et al, 1996). It was reported to be impossible to remove all flaws in a ceramic during the production of the specimens (Yilmaz et al, 2007). Since fracture begins at the edges, resistance values show great variation.…”

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

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“…The mechanical properties of zirconia are the highest ever reported for any dental ceramic, boasting of high flexural strength and toughness [2][3][4] . In prosthetic dentistry where strength and esthetics are important 5) , zirconia has become the favored material for posterior fixed partial dentures because it permits a prominent reduction in core thickness.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrashort pulsed laser on bond strength of Y-TZP zirconia ceramic to tooth surfaces

et al. 2015

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There is limited knowledge about the effects of ultrashort pulsed laser on zirconia ceramic surfaces. The aim of this study was to evaluate the effects of ytterbium (Yb)-doped fiber laser and other surface treatment methods -namely, sandblasting with 110 µm aluminum oxide or 30 µm silica-coated alumina on shear bond strength (SBS) of zirconia to tooth surface. A total of 128 zirconium oxide disks were made by using CAD-CAM technology. Disk surfaces were sandblasted with Al2O3 particles or silica-coated alumina or irradiated with Yb-doped fiber based nanosecond pulsed laser at 85W output power at 25 kHz. Disks were luted to dentin using two different resin cement. SBS of each specimen was measured. Results were statistically analyzed using two-way analysis of variance (ANOVA) and Bonferroni and Dunnett tests (p<0.005). Highest bond strength was obtained when zirconia surface was pretreated with Yb-doped fiber-based nanosecond pulsed laser regardless of the resin cement used.

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“…Tam seramik restorasyonlar içerisinde ideal alt yapı malzemesi arayıĢında gelinen son nokta yitriyum tetragonal zirkonya polikristal esaslı seramiklerdir. 4,5 Zirkonyanın istenmeyen faz değiĢimini engelleyerek oda sıcaklığında tetragonal fazda kalmasını sağlamak ve genleĢmesini önlemek için yapısına %3 mol yitriyum oksit eklenmektedir. 6 Zirkonyum seramikler biyouyumluluğu, estetik olması ve diğer birçok seramik materyalden yüksek kırılma dayanımı, düĢük plak birikimi gibi özellikleri sayesinde diĢ hekimliği alanında alt yapı materyali olarak sıklıkla tercih edilmektedir.…”

Section: Gġrġġunclassified

Farkli Güdük Materyalleri̇, Saklama Ortami Ve Si̇manin Zi̇rkon Alt Yapilarinin Kirilma Di̇renci̇ Üzeri̇nde Etki̇si̇

Özbayram¹,

Yanıkoğlu²,

Sağsöz³

2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Flexural strength and fracture toughness of dental core ceramics

Cited by 215 publications

References 35 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

Effect of ultrashort pulsed laser on bond strength of Y-TZP zirconia ceramic to tooth surfaces

Farkli Güdük Materyalleri̇, Saklama Ortami Ve Si̇manin Zi̇rkon Alt Yapilarinin Kirilma Di̇renci̇ Üzeri̇nde Etki̇si̇

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