Strength characterization and lifetime prediction of dental ceramic materials

Liu, Chao; Eser, Atılım; Albrecht, Thomas; Stournari, Vasiliki; Felder, Monika; Heintze, Siegward D.; Broeckmann, Christoph

doi:10.1016/j.dental.2020.10.015

Cited by 28 publications

(21 citation statements)

References 28 publications

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“…The results are similar to other studies which indicates more reliability for milled zirconia , 3 . However the values are lower in this study but conform with other studies 47,59 which can be attributed to differences in surface conditions, different test set‐ups, defect orientations, and testing environments 59 …”

Section: Discussionsupporting

confidence: 91%

“…The flexural strength data for brittle materials such as ceramics are not normally distributed, and Weibull analysis is suggested whenever sample size is more than 15 58 . Weibull modulus represents the variation in strength which is the result of internal flaws, chemical composition, the surface conditions, test conditions and more 59 . Lower Weibull means a greater variation in strength and less reliability for the material and the higher Weibull numbers represent lower variability and more reliability of the tested material 59 .…”

Section: Discussionmentioning

confidence: 99%

“…Weibull modulus represents the variation in strength which is the result of internal flaws, chemical composition, the surface conditions, test conditions and more 59 . Lower Weibull means a greater variation in strength and less reliability for the material and the higher Weibull numbers represent lower variability and more reliability of the tested material 59 . In this study, milled group showed the highest number for Weibull (8.1) and AM zirconia with no porosity showed the lowest Weibull (4.4).…”

Section: Discussionmentioning

confidence: 99%

“…59 Lower Weibull means a greater variation in strength and less reliability for the material and the higher Weibull numbers represent lower variability and more reliability of the tested material. 59 In this study, milled group showed the highest number for Weibull (8.1) and AM zirconia with no porosity showed the lowest Weibull (4.4). The results are similar to other studies which indicates more reliability for milled zirconia., 3 However the values are lower in this study but conform with other studies 47,59 which can be attributed to differences in surface conditions, different test setups, defect orientations, and testing environments.…”

Section: Discussionmentioning

confidence: 99%

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The Flexural Strength and Flexural Modulus of Stereolithography Additively Manufactured Zirconia with Different Porosities

Zandinejad

Das

Barmak

et al. 2021

Journal of Prosthodontics

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Purpose: Additive manufacturing (AM) technologies are capable of fabricating complex geometries with different porosities. However, the effect of such porosities on mechanical properties of stereolithography (SLA) AM zirconia with different porosities is unclear. The purpose of this in vitro study was to investigate the mechanical properties namely flexural strength, and flexural modulus of AM zirconia with different porosities. Materials and Methods: A bar (25 × 4 × 3 mm) for flexural strength test (ISO standard 6872/2015) was designed by CAD software program and standard tessellation language (STL) file was obtained. The STL file was used to fabricate a total of 80 bars in four groups. Three experimental groups each containing 20 samples were manufactured using an SLA ceramic printer (CeraMaker 900; 3DCeram Co) and zirconia material (3DMix ZrO 2 paste; 3DCeram Co) with different sintering post processing to achieve different porosities including 0%-porosity (AMZ0), 20%-porosity (AMZ20), and 40%-porosity (AMZ40). The same STL file was used for subtractive manufacturing or milling of 20 zirconia bars as control group (CNCZ) with the same dimensions using a commercial zirconia. Three-point bending tests were performed for all groups following ISO standard 6872/2015 specification using a universal testing machine. Outcomes measured included load at fracture, mean flexural strength, and flexural modulus and they were compared across the experimental groups using a one-way ANOVA. Post hoc pair wise comparison between each pair of the groups were performed using Tukey test. Results: There was a significant difference between the four groups, in terms of fracture load, flexural strength and flexural modulus using one-way ANOVA. AM zirconia with 0% porosity (AMZ0) showed the highest value for fracture load (1132.7 ± 220.6 N), flexural strength (755.1 ± 147.1 MPa) and flexural modulus (41,273 ± 2193 MPa) and AM zirconia with 40% porosity (AMZ40) showed the lowest fracture load (72.13 ± 13.42 N), flexural strength (48.09 ± 8.95 MPa) and flexural modulus (7177 ± 506 MPa). Tukey's pairwise comparisons detected a significant difference between all the possible pairs for all variables except flexural modulus between AMZ0 and CNCZ. The Weibull moduli presented the lowest value for AMZ20 (4.4) followed by AMZ40 (6.1), AMZ0 (6.1), and the highest value was for CNCZ (8.1). Conclusion: AM zirconia with 0% porosity showed significantly higher flexural strength and flexural modulus when compared to milled and AM zirconia with 20% and 40% porosities.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

The Flexural Strength and Flexural Modulus of Stereolithography Additively Manufactured Zirconia with Different Porosities

Zandinejad

Das

Barmak

et al. 2021

Journal of Prosthodontics

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“…In the present laboratory study, three types of ceramic [21][22][23] and three types of resin cements 24) were used. These materials are commonly used for prosthetic rehabilitation of anterior teeth.…”

Section: Discussionmentioning

confidence: 99%

Digital image analysis of fluorescence of ceramic veneers with different ceramic materials and resin cements

Zhang

2022

Dent. Mater. J.

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The objective of this study was to analyze the effect of the type of ceramics and resin cements on the fluorescence of ceramic veneers under the 405 nm UV-light by digital imaging. One hundred and ninety-two veneers were fabricated using three types of ceramics (IPS e.max CAD, IPS Empress CAD, and Zenostar). Eight pieces of substrates were made of resin-nano-ceramic (Lava Ultimate). The level of fluorescence for each sample cemented with the substrate using three kinds of resin cements (RelyX U200, Variolink N, and Choice 2) was analyzed by using histogram data of luminosity from Adobe Photoshop software. Furthermore, the fluorescence values were evaluated by two-way ANOVA and Tukey's test. The highest fluorescence values were observed for the IPS e.max CAD cemented with Choice 2 cement, followed by IPS Empress CAD, and Zenostar the lowest. The final fluorescence intensity of ceramic veneer is affected by ceramic materials and resin cements.

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Recent advances in design and preparation of bioceramic materials for manufacturing dental crowns by vat photopolymerization

Osama,

Fouda,

Eraky

2024

Discov Appl Sci

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The most durable and acceptable tooth-colored crown material should have good physical, and mechanical properties, chemical resistance, biocompatibility, and aesthetic behavior. The most common materials for artificial crowns are metals, polymers, and ceramics. Ceramics have better mechanical properties than polymers and better aesthetic properties than metals. Still, because of the ceramic excessive brittleness, it is not advisable to manufacture dental crowns by conventional manufacturing methods such as formative and subtractive due to some drawbacks in the previous types of manufacturing such as material wastage, and high complexity that conventional manufacturing methods can't achieve. So additive manufacturing methods attract the interest of researchers in dental ceramics. The most common additive manufacturing method is vat photopolymerization in which ceramic slurry is accurately prepared and then introduced into a 3d printing machine under the control of the vat photopolymerization process performance parameters then the printed part is introduced into the heat treatment process then we characterize the manufactured part to conform its performance with the required properties of the product. Then cost analysis is done to estimate the cost of manufactured dental crowns. Overall, the design of dental crowns for manufacturing is helpful for dental manufacturers.

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Strength characterization and lifetime prediction of dental ceramic materials

Cited by 28 publications

References 28 publications

The Flexural Strength and Flexural Modulus of Stereolithography Additively Manufactured Zirconia with Different Porosities

The Flexural Strength and Flexural Modulus of Stereolithography Additively Manufactured Zirconia with Different Porosities

Digital image analysis of fluorescence of ceramic veneers with different ceramic materials and resin cements

Recent advances in design and preparation of bioceramic materials for manufacturing dental crowns by vat photopolymerization

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