Fracture resistance of all-ceramic zirconia bridges with differing phase stabilizers and quality of sintering

Sundh, Anders; Sjögren, Göran

doi:10.1016/j.dental.2005.11.006

Cited by 115 publications

(112 citation statements)

References 16 publications

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“…The fact that both sandblasting and metal primers influence the bond strength of dental ceramics has been demonstrated in previous studies [1,[27][28][29]. However, airborne particle abrasion has the possibility to create subcritical microcracks and phase transformation within the zirconia surface, consequently causing unfavorable changes of superior mechanical properties of zirconia ceramics [13,30]. Recently, the metal primers have been suggested to act as adhesion promoters.…”

Section: Discussionmentioning

confidence: 92%

Effect of sandblasting and various metal primers on the shear bond strength of resin cement to Y-TZP ceramic

et al. 2010

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Section: Discussionmentioning

confidence: 92%

Effect of sandblasting and various metal primers on the shear bond strength of resin cement to Y-TZP ceramic

et al. 2010

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“…Okutan et al (2006) practiced 1.200.000 cycles, at 50 N and 1.3 Hz to evaluate the fracture strength of ceramic crowns. Sundh and Sjogren (2006) submitted FDPs with zirconia copings to mechanical cycling for 100.000 cycles at 50 N and noticed that the resistance after fracture ranged between 900 and 1900 N among the groups. Larsson et al (2007) subjected FDPs to mechanical cycling for 10.000 cycles at 1 Hz under loads ranging between 30 and 300 N. Since the aim of this study was to evaluate the effect of cyclic loading on zirconia without fracturing the specimens prior to flexural tests, it was decided to perform 20.000 cycles with a 50 N load.…”

Section: Discussionmentioning

confidence: 99%

“…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

101

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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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“…Due to their reinforcing and crystalline additives (leucite, alumina, magnesia, magnesium aluminate, lithium disilicate, zirconia, and sanidine) and required reinforcement procedures, ceramics possess different radiopacities (24,25,33,(55)(56)(57)(58)(59)(60)(61)(62)(63)(64)(65). Yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics have the same high levels of radiopacity as metals such as Cr-Ni alloy and gold (24).…”

Section: Ceramics and Metalsmentioning

confidence: 99%

Radiopacity of Dental Materials: An Overview

Pekkan¹

2016

Avicenna J Dent Res

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Context: This study aimed to provide an overview of the literature on the radiopacity of dental materials in order to emphasize its importance. Evidence Acquisition: English-language literature was investigated using manual and electronic searches for the terms "radiopacity," "dental material," "cement," "composite," "ceramic," "endodontic root canal sealer," "bone graft," and "acrylic resin" in the databases of Medline, google scholar, and Scopus up to April 2016. Seventy-nine selected publications, including review articles, original articles, and books, were evaluated. Results: The radiopacity of different dental materials may be lower or higher than that of the replaced tissue depending on the restorative material used. The research revealed that highly-radiopaque materials should not be used in dental restorations, except as bone graft and endodontic root canal filling materials. For most of the dental restorative materials, moderate radiopacity within the range of the replaced dental tissue is recommended. However, the lower radiopacity of polymer-based restorative or prosthetic dental materials is still a significant clinical problem. Conclusions:The author recommends using highly-radiopaque materials whenever possible for treatment of bone defects and root canals. For dental materials that replace clinical crowns, the radiopacity should be within the range of that of the replaced tooth structure (dentin or enamel). The radiopacity of dental cements should be much higher than that of the enamel in order to facilitate detection of the thin cement remnants.

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Fracture resistance of all-ceramic zirconia bridges with differing phase stabilizers and quality of sintering

Cited by 115 publications

References 16 publications

Effect of sandblasting and various metal primers on the shear bond strength of resin cement to Y-TZP ceramic

Effect of sandblasting and various metal primers on the shear bond strength of resin cement to Y-TZP ceramic

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

Radiopacity of Dental Materials: An Overview

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