Mechanical properties of lithium metasilicate after short-term thermal treatments

Simba, Bruno Galvão; Ribeiro, Marcos Valério; Suzuki, Paulo Atsushi; Alves, Manuel Fellipe Rodrigues Pais; Strecker, Kurt; Santos, Claudinei dos

doi:10.1016/j.jmbbm.2019.06.011

Cited by 27 publications

(13 citation statements)

References 26 publications

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“…Although in the present work, the heat treatment of samples of group 1 was only 90 seconds at 820°C, the flexural strength of Celtra Duo after heat treatment (G1) was higher than that of the same glass-ceramic without heat treatment (167 MPa) (G2). Described that the crystalline fraction can vary according to the temperature and the time of nucleation and crystal growth, it is known that the thermal treatments allow to obtain the desired microstructure and to optimize the glass-ceramic properties, increasing the mechanical resistance of brittle materials [ 16 ]. Details of the effect of thermal treatment parameters on the transformation of lithium metasilicate (Li 2 SiO 3 ) into lithium disilicate (Li 2 Si 2 O 5 ) and the resulting mechanical properties have been shown in the literature [ 16 ].…”

Section: Discussionmentioning

confidence: 99%

Flexural Strength of Vitreous Ceramics Based on Lithium Disilicate and Lithium Silicate Reinforced with Zirconia for CAD/CAM

Corado

Silveira

Ortega

et al. 2022

International Journal of Biomaterials

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The dental prosthesis market is rapidly evolving to meet patient and clinical demands. These new materials must have good flexural strength, toughness, aesthetic properties, and reliability in performance for structural applications. The present work aimed to compare the bending strength of 4 types of chairside lithium disilicate (Li2Si2O5) glass-ceramics used for dental prosthesis and to analyze the influence of heat treatment on the transformation of lithium metasilicate (Li2SiO3) into lithium disilicate. The three-ball test for the biaxial flexion test (B3B) was used. Weibull statistical analysis was used, and it showed that samples with a higher percentage of zirconia have a greater tendency to fail. The flexion tests showed that the addition of more than 10% of zirconia reduced the flexural strength. The heat treatment process improves and provides greater mechanical strength. The XRD results indicated that the samples with the lowest percentage of zirconia exhibited greater crystallinity and corroborated the microstructural analysis. SEM analyses showed a greater amount and elongated crystals of lithium disilicate when comparing samples with a higher percentage of zirconia. Therefore, samples with lower zirconia showed greater flexural strength than samples with higher additions of zirconia.

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Section: Discussionmentioning

confidence: 99%

Flexural Strength of Vitreous Ceramics Based on Lithium Disilicate and Lithium Silicate Reinforced with Zirconia for CAD/CAM

Corado

Silveira

Ortega

et al. 2022

International Journal of Biomaterials

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“…Current products, however, are not designed to be suitable for multi‐unit restorations including molar teeth. To solve this problem, many attempts have been made to develop new dental glass‐ceramics with improved chemical and mechanical properties 9,10 . However, the majority of glass‐ceramics have long‐term limitations when used in posterior restorations that carry a great deal of pressure.…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, many attempts have been made to develop new dental glass-ceramics with improved chemical and mechanical properties. 9,10 However, the majority of glass-ceramics have long-term limitations when used in posterior restorations that carry a great deal of pressure. Among those mentioned crystalline phases, lithium disilicate (LD; Li 2 Si 2 O 5 ) is of particular interest for production of dental glass-ceramics as veneers, inlays, onlays, and anterior crowns.…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatment temperature on the properties of the lithium disilicate‐fluorcanasite glass‐ceramics

Kraipok

Intawin

Bintachitt

et al. 2021

Int J Applied Ceramic Tech

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This study aims to investigate the influence of heat treatment temperatures on the mechanical properties and chemical solubility (CS) of lithium disilicate‐fluorcanasite glass‐ceramics and to develop new dental materials. The glasses and glass‐ceramics were prepared using CaF2‐SiO2‐CaO‐K2O‐Na2O‐Li2O‐Al2O3‐P2O5‐based glass system using a conventional melt quenching method followed by a two‐stage crystallization process. This two‐stage method involves two heating temperature steps: first at a constant temperature (TS1) of 600°C and second step at varying temperatures (TS2) of 650, 700, 750, and 800°C. The crystallization behavior, phase formation, microstructure, translucency characteristic, density, hardness, fracture strength, and CS were investigated. It was found that the lithium disilicate crystal acted as the main crystalline phase, and the crystalline phase of fluorcanasite occurred at the heat treatment temperatures of 750 and 800°C. In addition, it was found that density, hardness, fracture strength, and CS increased while the translucency values decreased with increasing heat treatment temperatures. Furthermore, the CS increased dramatically when the fluorcanasite phases occurred in the glass‐ceramic samples. The maximum density values, Vickers hardness, fracture toughness, and flexural strength are 2.56 g/cm3, 6.73 GPa, 3.38 MPa.m1/2, and 259 MPa, respectively. These results may offer a possibility to design a new material for dental applications based on lithium disilicate‐fluorcanasite glass‐ceramics.

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“…Other ceramic materials are also widely used in dentistry [23,24], such as lithium disilicate (Li 2 Si 2 O 5 ) glass ceramic. This material has been used for CAD/CAM manufacture since 2006 under the name IPS e.max CAD ® and has diverse indications (e.g., crowns, inlays, onlays, implant crowns, and veneers) because of its aesthetic properties and mechanical strength [2,6,17,23,24,25,26]. It is commercialised as pre-crystallised blue blocks, which have a metasilicate and lithium disilicate nucleus.…”

Section: Introductionmentioning

confidence: 99%

Biocompatibility of Polymer and Ceramic CAD/CAM Materials with Human Gingival Fibroblasts (HGFs)

et al. 2019

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Four polymer and ceramic computer-aided design/computer-aided manufacturing (CAD/CAM) materials from different manufacturers (VITA CAD-Temp (polymethyl methacrylate, PMMA), Celtra Duo (zirconia-reinforced lithium silicate ceramic, ZLS), IPS e.max CAD (lithium disilicate (LS2)), and VITA YZ (yttrium-tetragonal zirconia polycrystal, Y-TZP)) were tested to evaluate the cytotoxic effects and collagen type I secretions on human gingival fibroblasts (HGFs). A total of 160 disc-shaped samples (Ø: 10 ± 2 mm; h: 2 mm) were milled from commercial blanks and blocks. Direct-contact cytotoxicity assays were evaluated at 24, 48, and 72 h, and collagen type I (COL1) secretions were analysed by cell-based ELISA at 24 and 72 h. Both experiments revealed statistically significant differences (p < 0.05). At 24 and 48 h of contact, cytotoxic potential was observed for all materials. Later, at 72 h, all groups reached biologically acceptable levels. LS2 showed the best results regarding cell viability and collagen secretion in all of the time evaluations, while Y-TZP and ZLS revealed intermediate results, and PMMA exhibited the lowest values in both experiments. At 72 h, all groups showed sharp decreases in COL1 secretion regarding the 24-h values. According to the results obtained and the limitations of the present in vitro study, it may be concluded that the ceramic materials revealed a better cell response than the polymers. Nevertheless, further studies are needed to consolidate these findings and thus extrapolate the results into clinical practice.

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Mechanical properties of lithium metasilicate after short-term thermal treatments

Cited by 27 publications

References 26 publications

Flexural Strength of Vitreous Ceramics Based on Lithium Disilicate and Lithium Silicate Reinforced with Zirconia for CAD/CAM

Flexural Strength of Vitreous Ceramics Based on Lithium Disilicate and Lithium Silicate Reinforced with Zirconia for CAD/CAM

Influence of heat treatment temperature on the properties of the lithium disilicate‐fluorcanasite glass‐ceramics

Biocompatibility of Polymer and Ceramic CAD/CAM Materials with Human Gingival Fibroblasts (HGFs)

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