Fabrication of ZrO2-Bearing lithium-silicate glass-ceramics by pressureless sintering and spark plasma sintering

Ghayebloo, M.; Alizadeh, Parvin; Melo, Renata Marques de

doi:10.1016/j.jmbbm.2020.103709

Cited by 9 publications

(10 citation statements)

References 19 publications

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“…The authors concluded that the properties of ZTA ceramic depend on sintering temperature, and the optimal temperature was about 1200-1250 °C. Ghayebloo et al [68] revealed that it is possible to fabricate ZLS glass-ceramics by sintering (Figure 4). The results showed a highest flexural strength of 255.10 ± 15.44 MPa, a fracture toughness of 3.15 ± 0.62 MPam 1/2 , a Vickers microhardness of 7.96 ± 0.13 GPa, and a bulk density of 2.63 ± 0.02 g/cm 3 .…”

Section: Sinteringmentioning

confidence: 99%

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Recent Advances in Ceramic Materials for Dentistry

Mhadhbi¹,

Khlissa²,

Bouzidi³

2021

Advanced Ceramic Materials

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Dental ceramics constitute a heterogeneous group of materials with desirable optical and mechanical proprieties combined with chemical stability. They are inorganic non-metallic materials used in several applications. These materials are biocompatible to tissue, highly esthetic, with satisfying resistance to tensile and shear stress. Over the past years, several developments in new ceramic materials in dental restoration were achieved, including processing techniques and high mechanical properties. Thus, concepts on the structure and strengthening mechanisms of dental ceramic materials are also discussed. The dental practitioner requires best knowledge concerning indications, limitations, and correct use of started materials. The purpose of this book chapter is to overview advances in new ceramic materials and processes, which are used in dentistry. The properties of these materials are also discussed.

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Section: Sinteringmentioning

confidence: 99%

“…The glass infiltration processing is a powerful technique for the fabrication of ceramic/glass composite with exceptional mechanical properties and low shrinkage. The final samples obtained by spark plasma sintering [68].…”

Section: Glass Infiltrationmentioning

confidence: 99%

Recent Advances in Ceramic Materials for Dentistry

Mhadhbi¹,

Khlissa²,

Bouzidi³

2021

Advanced Ceramic Materials

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“…During heat pressing, ZrO2 promotes volume crystallization of glasses and hinders crystal growth (23). Consequently, smaller crystalline phases are present which improve optical properties and decrease surface roughness (24,25). However, the incorporation of ZrO2 and crystal growth hindering affected the flexural strength (26).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Re-Pressing on Biaxial Flexural Strength and Microstructure of Celtra Press (An Invitro Study)

Yehia

Hammad

Azer

2022

Alexandria Dental Journal

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INTRODUCTION:Celtra® Press is a zirconia-reinforced lithium silicate (ZLS) glass-ceramic containing 10 % zirconium oxide (ZrO2). This material is used to fabricate dental restorations by pressing technique. After heat pressing procedures leftover buttons are usually discarded. these leftover buttons are suggested to be re-pressed with concerns regarding changes in microstructure and mechanical properties. OBJECTIVES: To evaluate the effects of re-pressing on the mechanical properties and microstructure of Celtra® Press. METHODOLOGY: A total of 24-disc specimens; 14mm in diameter and 1.5 in thickness were fabricated by the lost wax technique. Specimens were divided into two parallel groups, Group I: Pressed specimens (n=12) and Group II: Re-pressed specimens (n=12). The biaxial flexural strength (BFS) was measured using a piston-on-three-ball test. X-ray diffraction (XRD) was used to identify the crystalline phases. Scanning electron microscope (SEM) photomicrographs (5000x) were used for microstructure analysis. RESULTS:The mean and standard deviation values of BFS for the pressed specimens (Group I) and the re-pressed specimens (Group II) were (136.72 ± 29.41) and (167.24 ± 36.46) MPa respectively. BFS of the repressed group was significantly higher than the pressed group (p=0.001). SEM photomicrographs (5000x) showed an increase in the grains size after repressing. X-ray diffraction revealed lithium silicate as the main crystalline phase and the peak intensities of the re-pressed specimens were lower than the pressed specimens. CONCLUSION: Re-pressing of Celtra® Press improved the BFS values significantly. Lithium silicate was the main crystalline phase in the pressed and re-pressed specimens. Celtra® Press grains were larger after re-pressing under SEM.

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“…Recently, X-ray photoelectron spectroscopy (XPS) was used to survey four highly sintered LDGC materials, and revealed significant chemical alterations on the sample surface [ 12 ]. Besides, Ghayebloo et al investigated ZrO 2 -bearing LDGC materials fabricated by pressure-less sintering and spark plasma sintering, and minor alterations of chemical bonds were identified by Fourier transform infrared (FTIR) spectroscopy [ 13 ]. These studies provided us potential tools to reveal the subtle alteration of the LDGC microstructure.…”

Section: Introductionmentioning

confidence: 99%

The effect of prolonged holding time on the mechanical property and microstructural property of lithium disilicate glass-ceramic

Lin

Wang

Zhang

et al. 2022

J Mater Sci: Mater Med

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Repeat firing produces uncertainty about stabilizing lithium disilicate glass-ceramic (LDGC) material properties, even though prolonged holding time can enhance the mechanical property of LDGC during a single firing cycle. However, the effect of prolonged holding time and repeat firing on the mechanical property and microstructure of LDGC is not fully understood. In the present study, three groups of LDGC material were created: (i) extension of holding time (7 vs. 14 vs. 28 min) at 780–800 °C; (ii) holding time extension (7 vs. 14 min) and dual sintering at 800–820 °C, respectively; (iii) dual sintering with prolonged holding time (7 vs. 14 min) at 820–840 °C. The nano-indenter test revealed that prolonged holding time (14 and 28 min) promoted the enhancement of LDGC hardness and Young’s modulus. X-ray photoelectron spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy confirmed that prolonged holding time increased and stabilized LD phase in LDGC, as well as induced residual compressive stress. Scanning electron microscopy showed that prolonged holding time increased LD crystal grains homogeneously and facilitated LDGC to form dense interlocking structure without enlarging crystal size grains significantly. In contrast, LDGC that dual sintered alone at 820–840 °C possessed inferior mechanical properties, coupled with heterogeneous crystal phases, residual tensile stress, and melted crystals grains in the porous microstructure. Interestingly, these deteriorated properties of LDGC caused by dual sintering alone could be counteracted by prolonging the holding time. Nevertheless, the LDGC materials displayed an excellent biocompatibility throughout the study. This study identified that prolonged holding time during repeated firing cycles stabilized LD phase and crystal grain size of LDGC, thus enhanced the mechanical properties, which provided a new insight to extend the repeat fired restoration longevity of LDGC.

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Fabrication of ZrO2-Bearing lithium-silicate glass-ceramics by pressureless sintering and spark plasma sintering

Cited by 9 publications

References 19 publications

Recent Advances in Ceramic Materials for Dentistry

Recent Advances in Ceramic Materials for Dentistry

The Effects of Re-Pressing on Biaxial Flexural Strength and Microstructure of Celtra Press (An Invitro Study)

The effect of prolonged holding time on the mechanical property and microstructural property of lithium disilicate glass-ceramic

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