Flexural strength of an infused ceramic, glass ceramic, and feldspathic porcelain

Giordano, Russell; Pelletier, Lionel B.; Campbell, Stephen D.; Pober, Richard

doi:10.1016/s0022-3913(05)80067-8

Cited by 101 publications

(67 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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%

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

“…Although In-Ceram ® Zirconia has less glass phase than does Vitadur Alpha, In-Ceram ® Zirconia should have more glass phase boundary area, since it is a 3-3 composite material. Furthermore, the phase boundaries are continuous throughout the microstructure [47].…”

Section: Discussionmentioning

confidence: 99%

Analysis of subcritical crack growth in dental ceramics using fracture mechanics and fractography

Taskonak¹,

Griggs²,

Mecholsky³

et al. 2008

Dental Materials

View full text Add to dashboard Cite

Objectives-The aim of this study was to test the hypothesis that the flexural strengths and critical flaw sizes of dental ceramic specimens will be affected by the testing environment and stressing rate even though their fracture toughness values will remain the same.Methods-Ceramic specimens were prepared from an aluminous porcelain (Vitadur Alpha; VITA Zahnfabrik, Bad Säckingen, Germany) and an alumina-zirconia-glass composite (In-Ceram ® Zirconia; VITA Zahnfabrik). Three hundred uniaxial flexure specimens (150 of each material) were fabricated to dimensions of 25 mm × 4 mm × 1.2 mm according to the ISO 6872 standard. Each group of 30 specimens was fractured in water using one of four different target stressing rates ranging on a logarithmic scale from 0.1 to 100 MPa/s for Vitadur Alpha and from 0.01 to 10 MPa/s for InCeram ® Zirconia. The fifth group was tested in inert environment (oil) with a target stressing rate of 100 MPa/s for Vitadur Alpha and 1000 MPa/s for In-Ceram ® Zirconia. The effects of stressing rate and environment on flexural strength, critical flaw size, and fracture toughness were analyzed statistically by Kruskal-Wallis one-way ANOVA on ranks followed by post-hoc comparisons using Dunn's test (α=0.05). In addition, 20 Vitadur Alpha specimens were fabricated with controlled flaws to simplify fractography. Half of these specimens were fracture tested in water and half in oil at a target stressing rate of 100 MPa/s, and the results were compared using Mann-Whitney rank sum tests (α=0.05). A logarithmic regression model was used to determine the fatigue parameters for each material.Results-For each ceramic composition, specimens tested in oil had significantly higher strength (P≤0.05) and smaller critical flaw size (significant for Vitadur Alpha, P≤0.05) than those tested in water but did not have significantly different fracture toughness (P>0.05). Specimens tested at faster stressing rates had significantly higher strength (P≤0.05) but did not have significantly different fracture toughness (P>0.05). Regarding critical flaw size, stressing rate had a significant effect for In-Ceram ® Zirconia specimens (P≤0.05) but not for Vitadur Alpha specimens (P>0.05). Fatigue parameters, n and ln B, were 38.4 and −12.7 for Vitadur Alpha and were 13.1 and 10.4 for InCeram ® Zirconia.Significance-Moisture assisted subcritical crack growth had a more deleterious effect on InCeram ® Zirconia core ceramic than on Vitadur Alpha porcelain. Fracture surface analysis identified

show abstract

“…Evans & O´Brien (24) en 1999, observaron en microscopia electrónica de barrido una sinterización incompleta de las infra-estructuras no infiltradas, permitiendo la formación de defectos internos que promueven la formación de un material más frágil. Sin embargo cuando se aplica el vidrio, éste ocupa los espacios intersticiales y actúa como liga entre los cristales disminuyendo la cantidad de poros e irregularidades de la superficie que representan sitios de propagación de fracturas, lo cual aumenta significativamente la resistencia del material (24)(25)(26)(27). En nuestro estudio la presencia de esta fase vítrea en los cuerpos de prueba del grupo G1 y del grupo G3 disminuyó los valores de resistencia a la flexión y dureza, cuando comparados a los valores obtenidos para los cuerpos de prueba del grupo G2 y grupo G4 sin fase vítrea.…”

Section: Discussionunclassified

Influence of the Sintering Type in Ceramics Blocks for Cad-Cam

Kreisler

Oliveira

2016

Odovtos - Int J Dent Sc

View full text Add to dashboard Cite

The aim of this study was to characterize the influence of the sintering type in the flexural strength and hardness of ceramic blocks for CAD-CAM. Four type of ceramic blocks were selected and distributed according to the type of sintering to be performed: Group G1 - In-Ceram® Alumina / liquid state; Group G2 - In-Ceram® AL / solid state; Group G3 - In-Ceram® Zircon / liquid state; Group G4 - In-Ceram® YZ / solid state. All blocks were cut in bar shape with dimensions of 25 x 5 x 2 mm. and submitted to the three-point bending test and to the Vickers hardness test method. The results, after statistical analysis, showed that the average flexural strength of group G1 (351.7 MPa) and group G3 (356.3 MPa) were significantly lower than those of group G2 (421.9 MPa) and group G4 (758.4 MPa); as well as all hardness averages were significantly different, being higher for group G2 (1.936,6 HV) and group G4 (1.321,4 HV), when compared to group G1 (1.173,3 HV) and group G3 (1.094,6 HV). It was concluded that the solid state sintering proved to be more efficient to obtain maximum densification of the ceramics blocks, resulting in high values of flexural strength and hardness.

show abstract

Flexural strength of an infused ceramic, glass ceramic, and feldspathic porcelain

Cited by 101 publications

References 8 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

Analysis of subcritical crack growth in dental ceramics using fracture mechanics and fractography

Influence of the Sintering Type in Ceramics Blocks for Cad-Cam

Contact Info

Product

Resources

About