Threshold intensity factors as lower boundaries for crack propagation in ceramics

Marx, R.; Jungwirth, Franz; Walter, Per-Ole

doi:10.1186/1475-925x-3-41

Cited by 27 publications

(14 citation statements)

References 21 publications

(23 reference statements)

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“…This implies that a threshold intensity factor can exist as a lower boundary for crack propagation. Threshold intensities have been measured for 11 dental ceramics, and they generally are below 1 MPa m 0.5 to around 2 MPa m 0.5 for polycrystalline ceramics [45]. It is interesting that the threshold for alumina and zirconia are nearly identical.…”

Section: Threshold Conceptsmentioning

confidence: 99%

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ADM guidance-ceramics: Fatigue principles and testing

et al. 2017

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Section: Threshold Conceptsmentioning

confidence: 99%

“…Another important concept on the "other end" of the fatigue phenomenon for ceramics is that for some ceramics there can be a stress intensity below which crack growth does not occur [45,46]. This implies that a threshold intensity factor can exist as a lower boundary for crack propagation.…”

Section: Threshold Conceptsmentioning

confidence: 99%

ADM guidance-ceramics: Fatigue principles and testing

et al. 2017

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“…The storage modulus E' of 216 GPa, which could be determined with DMA correlates with the modulus of elasticity of 210 GPa in literature. 13…”

Section: Discussionmentioning

confidence: 99%

“…However flaws on the tensile loaded surface may grow to slow crack growth mechanisms. 13,19 Abrading caused high deviation of the flexural strength and reliability, what might affect clinical use. 9,16,18 No influence of E' after storage in water or acid could be determined, when the sandblasted surface was tested in pressure zone.…”

Section: E'mentioning

confidence: 99%

Influence of Heat Treatment and Veneering on the Storage Modulus and Surface of Zirconia Ceramic

et al. 2011

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Objectives:Glass-ceramic veneered zirconia is used for the application as fixed partial dentures. The aim of this investigation was to evaluate whether the heat treatment during veneering, the application of glass-ceramic for veneering or long term storage has an influence on the storage modulus of zirconia.Methods:Zirconia bars (Cercon, DeguDent, G; 0.5x2x20 mm) were fabricated and treated according to veneering conditions. Besides heating regimes between 680°C and 1000°C (liner bake and annealing), sandblasting (Al2O3) or steam cleaning were used. The bars were investigated after 90 days storage in water and acid. For investigating the influence of veneering, the bars were veneered in press- or layer technique. Dynamic mechanical analysis (DMA) in a three-point-bending design was performed to determine the storage modulus between 25°C and 200°C at a frequency of 1.66 Hz. All specimens were loaded on top and bottom (treatment on pressure or tensile stress side). Scanning electron microscopy (SEM) was used for evaluating the superficial changes of the zirconia surface due to treatment. Statistical analysis was performed using Mann Whitney U-test (α=0.05).Results:Sintered zirconia provided a storage modulus E’ of 215 (203/219) GPa and tan δ of 0.04 at 110°C. A 10%-decrease of E’ was found up to 180°C. The superficial appearance changed due to heating regime. Sandblasting reduced E’ to 213 GPa, heating influenced E’ between 205 GPa (liner bake 1) and 222 GPa (dentin bake 1). Steam cleaning, annealing and storage changed E’ between 4 GPa and 22 GPa, depending on the side of loading. After veneering, strong E’-reduction was found down to 84 GPa and 125 GPa.Conclusions:Veneering of zirconia with glass-ceramic in contrast to heat treating during veneering procedure had a strong influence on the modulus. The application of the glass-ceramic caused a stronger decrease of the storage modulus.

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“…Considering that masticatory forces are cyclic, a fatigue testing should be carried out to predict how long an implant system is going to function properly [20]. In vitro tests should better simulate the clinical situations [21][22][23] and allow clinicians to understand the probability of survival of prosthetic components and implants [13]. Before implant components are launched to the market, they should satisfy the ISO 14801 specifications [24].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fatigue Behavior in Dental Implants from In Vitro Clinical Tests: A Systematic Review

Rojo

Prados-Privado

Reinoso

et al. 2018

Metals

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In the area of dentistry, there is a wide variety of designs of dental implant and materials, especially titanium, which aims to avoid failures and increase their clinical durability. The purpose of this review was to evaluate fatigue behavior in different connections and implant materials, as well as their loading conditions and response to failure. In vitro tests under normal and dynamic loading conditions evaluating fatigue at implant and abutment connection were included. A search was conducted in PubMed, Scopus, and Science Direct. Data extraction was performed independently by two reviewers. The quality of selected studies was assessed using the Cochrane Handbook proposed by the tool for clinical trials. Nineteen studies were included. Fourteen studies had an unclear risk and five had high risk of bias. Due to the heterogeneity of the data and the evaluation of the quality of the studies, meta-analysis could not be performed. Evidence from this study suggests that both internal and morse taper connections presented a better behavior to failure. However, it is necessary to unify criteria in the methodological design of in vitro studies, following methodological guidelines and establishing conditions that allow the homogenization of designs in ISO (International Organization for Standardization) standards.

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Threshold intensity factors as lower boundaries for crack propagation in ceramics

Cited by 27 publications

References 21 publications

ADM guidance-ceramics: Fatigue principles and testing

ADM guidance-ceramics: Fatigue principles and testing

Influence of Heat Treatment and Veneering on the Storage Modulus and Surface of Zirconia Ceramic

Evaluation of Fatigue Behavior in Dental Implants from In Vitro Clinical Tests: A Systematic Review

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