Mechanical Properties of New Generations of Monolithic, Multi-Layered Zirconia

Bruhnke, Maria; Awwad, Yasmin; Müller, Wolf‐Dieter; Beuer, Florian; Schmidt, Franziska

doi:10.3390/ma16010276

Cited by 8 publications

(10 citation statements)

References 28 publications

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“…Importantly, this phenomenon was not observed in zirconia ceramics of uniform composition. In a study conducted by Bruhnke et al [49], the researchers investigated the possible differences in mechanical properties, specifically in terms of flexural strength, Vickers hardness, and fracture toughness, among the layers in a blank of zirconia ceramic of uniform composition. The study concluded that there were no statistically significant differences in mechanical properties observed among the layers in the blank.…”

Section: Discussionmentioning

confidence: 99%

Microstructure, physical and mechanical properties of dental polychromic multilayer zirconia of uniform composition

Dimitriadis,

Moschovas,

Tulyaganov

et al. 2023

European J Oral Sciences

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The present study aimed to compare the microstructure, physical, and mechanical properties of three commercially available dental polychromatic multilayer zirconia materials of uniform composition: Dima Mill Zirconia ML, VITA YZ/ST Multicolor, and VITA YZ/XT Multicolor (with 3, 4, and 5 mol% Y2O3, respectively); thus, the influence of Y2O3 content on the above properties of the produced materials was experimentally studied. Homogeneous zirconia ceramics with a dense micro‐ and nanostructure, without pores or defects, were produced after milling the blocks and sintering, which resulted in yttrium‐stabilized tetragonal and cubic zirconia. Statistical analysis of the results of measurable magnitudes was performed by the one‐way ANOVA test. The increase of Y2O3 content (from 3 to 5 mol%) favored larger grain and crystallite sizes and a decrease of the values of the mechanical properties; yet, the differences were statistically insignificant. Clinically, these differences are expected to have no impact on their function in the oral cavity, both in terms of their fracture propensity and the damage that can be caused to the opposing teeth. Accordingly, the experimental results qualify the polychromic multilayer zirconia ceramics of uniform composition fabricated by milling technology for use in dental restorations.

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Section: Discussionmentioning

confidence: 99%

Microstructure, physical and mechanical properties of dental polychromic multilayer zirconia of uniform composition

Dimitriadis,

Moschovas,

Tulyaganov

et al. 2023

European J Oral Sciences

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“…Translucent Monolithic, Multi-Layered Zirconia: Matching Esthetics with Strength Amar Bhochhibhoya 1 1 Assistant Professor, Department of Prosthodontics, T.U. Teaching Hospital, Institute of Medicine, Maharajgunj, Kathmandu, Nepal.…”

Section: Editorialmentioning

confidence: 99%

“…Tetragonal stabilized polycrystalline zirconia (TZP: tetragonal zirconia polycrystal) is doped with 3 mol% yttrium oxide (3Y-TZP). 1 The opaque appearance of zirconia is a key challenge in obtaining optimum esthetics. These restorations are typically veneered with a weak glassy phase ceramic to mask the opaque appearance.…”

Section: Editorialmentioning

confidence: 99%

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Translucent Monolithic, Multi-Layered Zirconia: Matching Esthetics with Strength

Bhochhibhoya

2022

J. Nep. Prosthodon. Soc.

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High esthetic demand of patients has led to the development of newer tooth-colored restorative materials. Yttria-stabilized Zirconia (3Y-TZP) ceramic is considered an acceptable material for prosthetic rehabilitation due to its high fracture resistance, biocompatibility, biomechanical stability, and better color matching compared to the traditional porcelain fused to metal restorations. Tetragonal stabilized polycrystalline zirconia (TZP: tetragonal zirconia polycrystal) is doped with 3 mol% yttrium oxide (3Y-TZP).The opaque appearance of zirconia is a key challenge in obtaining optimum esthetics. These restorations are typically veneered with a weak glassy phase ceramic to mask the opaque appearance. The risk of delamination and chipping of ceramic veneer from such layered prostheses is a major concern. High masticatory load in posterior teeth, poor framework design, inadequate thickness of ceramic veneer, contamination of zirconia substructure, low elastic modulus and thermal conductive of zirconia compared to veneer porcelain could be some of the factors leading to such catastrophic failures.Various methods have been developed to increase the translucency of zirconia such as increasing the percentage of the cubic phase, increasing sintering temperature, reducing impurities, altering yttria content, and reducing the grain size. With higher yttrium doping, the proportion of cubic phase zirconia is increased by 25 % for 4Y-TZP and 53 % for 5Y-TZP, which allows for improved translucency. However, with the increase in the cubic phase proportion, there is a risk of reduced strength, due to a reduction in the extent of transformation toughening.More recently, new monolithic multi-layer zirconia has been developed with a color gradient from the incisal to the cervical third, miming natural tooth color. Different grades of the translucent blank are available such as High Translucent Multi-layered (HTML), Super Translucent Multi-layered (STML), and Ultra Translucent Multi-layer zirconia (UHTML). Multi-layer zirconia discs consist of different layers with varying degrees of transparency: the outer enamel layer, transitions layers, and an inner body layer. This new innovative multilayer polychromatic zirconia blank allows technicians to work with a nearly universal zirconia blank. However, more researches ensuring the optimum mechanical properties of newer products are necessary before they can be safely used in all clinical scenarios.

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“…5 The improvement of zirconia materials has continued, and it has showed promise in terms of enhanced properties. 6 A common problem of ceramics layered upon a coping is the high rate of chipping. Monolithic zirconia is a more recently offered option to PFM and zirconia-ceramic prosthesis.…”

Section: Introductionmentioning

confidence: 99%

Prototype importance for implant supported zirconia bridges: a case report

Qamheya,

Ghanem,

Wahbeh

et al. 2024

JDHODT

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Biocompatible esthetic restorations are necessary in order to obtain successful results with implant therapy. Monolithic zirconia is a more recently offered option to PFM and zirconia-ceramic prosthesis. The optical properties of zirconia have been greatly enhanced, approaching those of ceramics, while the monolithic nature of the prosthesis reduces the chance of fracture or chipping and improves its structural properties. The major drawback of theses zirconia is mechanical and thermal problems that encountered when zirconia is exposed to hydrothermal aging due to the transformation of the metastable tetragonal zirconia into the monoclinic form. This case report describes 45 aged adult female patient with anterior maxillary mobile teeth, after clinical and radiographical examination, extraction and socket preservation were done at periodontal department, 6 months later implant installed and after 3 months of healing, the patient referred to prosthodontic department. Screw retained temporary prosthesis were fabricated, composite build up were done intraorally for the temporary prosthesis to achieve the esthetic and functional occlusion. Cement retained implant supported fixed prosthesis using monolithic zirconia were cemented and no occlusal adjustment is needed thanks to the adjusted temporary prosthesis which served as prototype for a zirconia bridge with functional occlusion.

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Mechanical Properties of New Generations of Monolithic, Multi-Layered Zirconia

Cited by 8 publications

References 28 publications

Microstructure, physical and mechanical properties of dental polychromic multilayer zirconia of uniform composition

Microstructure, physical and mechanical properties of dental polychromic multilayer zirconia of uniform composition

Translucent Monolithic, Multi-Layered Zirconia: Matching Esthetics with Strength

Prototype importance for implant supported zirconia bridges: a case report

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