Composition, processing, and properties of biphasic zirconia bioceramics: Relationship to competing strength and optical properties

Lim, Chek Hai; Vardhaman, Sonaj; Reddy, N. Ramamanohar; Zhang, Y

doi:10.1016/j.ceramint.2022.02.265

Cited by 27 publications

(16 citation statements)

References 77 publications

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“…All specimens showed reasonably high flexural strengths (625.4 ± 75.5 MPa), as shown in Figure 14 A. These values were comparable to those obtained using dental CAD/CAM [ 37 , 59 ]. In addition, all specimens showed flexural strengths higher than 500 MPa.…”

Section: Resultssupporting

confidence: 73%

“…This finding suggests that 5Y-PSZ dental crowns manufactured using our DLP process could offer reasonable translucency when they are highly densified without notable defects. It should be noted that cubic phase content can be further controlled by adjusting sintering temperature if necessary [ 43 , 59 ].…”

Section: Resultsmentioning

confidence: 99%

“…For clinical uses, dental crowns should have reasonable optical translucency [ 35 , 59 , 60 , 61 ]. Thus, light transmittance capabilities of 5Y-PSZ specimens manufactured using our DLP technique was roughly evaluated.…”

Section: Resultsmentioning

confidence: 99%

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Manufacturing and Characterization of Dental Crowns Made of 5-mol% Yttria Stabilized Zirconia by Digital Light Processing

et al. 2023

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We herein report manufacturing of dental crowns made of 5-mol% yttria partially stabilized zirconia (5Y-PSZ) with desired mechanical properties, optical translucency and dimensional accuracy using digital light processing (DLP). To this end, all processing parameters were carefully controlled and optimized. First, 5Y-PSZ particles with a bimodal distribution were prepared via calcination of as-received granules and subsequent ball-milling and then used to formulate 5Y-PSZ suspensions with a high solid loading of 50 vol% required for high densification after sintering. Dispersant content was also optimized. To provide high dimensional accuracy, initial dimensions of dental crowns for 3D printing were precisely determined by considering increase and decrease in dimensions during photopolymerization and sintering, respectively. Photopolymerization time was also optimized for a given layer thickness of 50 μm to ensure good bonding between layers. A multi-step debinding schedule with a slow heating rate was employed to avoid formation of any defects. After sintering at 1500 °C for 2 h, 5Y-PSZ could be almost fully densified without noticeable defects within layers and at interfaces between layers. They had high relative densities (99.03 ± 0.39%) with a high cubic phase content (59.1%). These characteristics allowed for achievement of reasonably high mechanical properties (flexural strength = 625.4 ± 75.5 MPa and Weibull modulus = 7.9) and % transmittance (31.4 ± 0.7%). In addition, 5Y-PSZ dental crowns showed excellent dimensional accuracy (root mean square (RMS) for marginal discrepancy = 44.4 ± 10.8 μm and RMS for internal gap = 22.8 ± 1.6 μm) evaluated by the 3D scanning technique.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

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Manufacturing and Characterization of Dental Crowns Made of 5-mol% Yttria Stabilized Zirconia by Digital Light Processing

et al. 2023

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“…Ordinarily, glass-to-crystal transformation can be accompanied by significant shrinkage (Zanotto and Mauro 2017). However, firing of IPS e.max CAD restorations results in virtually no deformation with very small shrinkage (~0.2% vs. ~20% sintering shrinkage of zirconia; Lim et al 2022). The key to mitigate against shrinkage is to maintain high glass viscosity throughout the crystallization process (Fu et al 2016), typically around 2 orders of magnitude greater than that at the glass-softening temperature.…”

Section: Formingmentioning

confidence: 99%

A Critical Review of Dental Lithia-Based Glass–Ceramics

et al. 2023

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The purpose of this article is to review current understanding of lithia-based glass–ceramics and to identify future research needs for this class of dental materials in relation to novel compositions and fabrication methods. With rapid advances in material development and digital technology, time efficiency of dental workflow and fit accuracy of ceramic restorations are ever improving. Lithia-based glass–ceramics are at the forefront of this advance—new variants with more efficient fabrication routes are continually being introduced into the marketplace. Base glass composition, crystallization heat treatment, nucleant and coloration additives, and property gradation are some pertinent variables. The trend in fabrication is to move from CAD/CAM grinding of partially crystallized glass–ceramics to fully crystallized materials, thereby circumventing the need for postmachining firing altogether. In these endeavors, a better understanding of mechanical properties and evolving shaping technologies, such as ductile grinding, is paramount. Additive manufacturing and 3-dimensional printing methodologies offer a promising alternative to current CAD/CAM subtractive manufacturing routes. Challenges to the implementation of new technologies in efficient development and production of high-quality dental glass–ceramic prostheses are addressed.

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“…CAD/CAM (Computer-Aided Design/ Computer-Aided Manufacturing) milling of a pre-sintered blank in a full-contour form is often done in monolithic zirconia restorations in clinical practice. Due to their optical, mechanical, and biological properties, the Yttria-stabilized Tetragonal Zirconia Polycrystals (Y-TZP) are increasingly used for highstrength ceramic crown bridges and abutments [1][2][3][4]. This is significant in terms of clinical practice because polished monolithic zirconia has the potential to be a versatile restorative material.…”

Section: Introductionmentioning

confidence: 99%

3-D Surface Morphological Characterization of CAD/CAM Milled Dental Zirconia: An In Vitro Study of the Effect of Post-Fabrication Processes

Patil

Jebaseelan

2022

Materials

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Objective: To investigate the effect on zirconia surface of the post-fabrication surface treatments on the morphological characteristics and mechanical properties of CAD/CAM milled dental zirconia specimens as well as to identify the critical parameters in the measurement of oral retention under in vitro circumstances. Method: The zirconia specimens (N = 20, n = 4) were subjected to CAD/CAM milling and divided into five groups. The specifications were: Group G1—sintered; Group G2—sintered followed by a polishing process; Group G3—sintered followed by polishing and sandblasting with alumina particles Al2O3 (110 µm); Group G4—sintered followed by sandblasting; Group G5—sintered followed by sandblasting with polishing as the end process. All the groups were subjected to Fretting wear tests, 3-D surface roughness measurements, and Vickers’s Micro hardness tests. Investigation of the phase transformation using XRD, and surface feature examination using SEM were also carried out. Additionally, one-way ANOVA, Tukey, and Pearson correlations were statistically analysed. Results: The fabrication processes had a significant effect on the performance of zirconia specimens in all the groups (p > 0.05). Specimens that underwent polishing as the last process exhibited lower surface roughness. The monoclinic phase of zirconia was observed in all the specimens before and after wear except for those in the G2 and G5 groups, where polishing was the end process. In G5, the post-wear surface properties revealed lower surface roughness and hardness. Further, the SEM and 3-D topography show grooves as seen by the dale void volume (Vvv) values; shallow valley depth (Svk); micro craters; and wear track. Conclusion: Specimens in G5 that were subjected to multistep post-fabrication process, namely sandblasting followed by polishing, yielded better results when compared to those in the other groups (G1, G2, G3, and G4). G5 with an interlayer of alumina is recommended for clinical applications due to its enhanced surface properties, mechanical properties, and low wear.

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Composition, processing, and properties of biphasic zirconia bioceramics: Relationship to competing strength and optical properties

Cited by 27 publications

References 77 publications

Manufacturing and Characterization of Dental Crowns Made of 5-mol% Yttria Stabilized Zirconia by Digital Light Processing

Manufacturing and Characterization of Dental Crowns Made of 5-mol% Yttria Stabilized Zirconia by Digital Light Processing

A Critical Review of Dental Lithia-Based Glass–Ceramics

3-D Surface Morphological Characterization of CAD/CAM Milled Dental Zirconia: An In Vitro Study of the Effect of Post-Fabrication Processes

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