Microstructure characterization and SCG of newly engineered dental ceramics

Ramos, Nathália de Carvalho; Campos, Tiago Moreira Bastos; Paz, Igor Siqueira de La; Machado, João Paulo Barros; Bottino, Marco Antônio; César, Paulo Francisco; Melo, Renata Marques de

doi:10.1016/j.dental.2016.03.018

Cited by 169 publications

(124 citation statements)

References 10 publications

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“…Margin inaccuracy may be related to the increased brittleness index and chipping factor of ZLS, resulting in greater marginal misfit, probably due to the presence of zirconia in the microstructure 19,27 . The chipping factor (%) is the ratio of the total amount of chipping around the marginal circumference of the restoration multiplied by 100 27 .…”

Section: Discussionmentioning

confidence: 99%

“…The presence of zirconia in the microstructure seems to increase material hardness, making it more prone to chipping during milling 19 . Chipping can worsen the adaptation of the material and indirectly compromise fracture loads 20 .…”

Section: Discussionmentioning

confidence: 99%

“…Its manufacturer claims that it is an outstanding aesthetic material, with more strength and easy milling ability compared with lithium disilicate (LDS), generating optimized edge stability. Nevertheless, few studies supporting these features have been published 6,19,30 .…”

Section: Introductionmentioning

confidence: 99%

“…The use of zirconia seemed to solve the problem of resistance in these systems, but the aesthetic quality of this material is less than desirable 2 . In the effort to obtain an aesthetic and strong material, a ceramic with 10% zirconia added to lithium silicate was recently developed and released 19 . Named zirconia-reinforced lithium silicate (ZLS), this material was designed for exclusive use with computer-aided design/computer-aided manufacturing (CAD/CAM) systems.…”

Section: Introductionmentioning

confidence: 99%

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Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

et al. 2017

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Zirconia-reinforced lithium silicate (ZLS) is a ceramic that promises to have better mechanical properties than other materials with the same indications as well as improved adaptation and fracture strength. Objective In this study, marginal and internal misfit and fracture load with and without thermal-mechanical aging (TMA) of monolithic ZLS and lithium disilicate (LDS) crowns were evaluated.Material and methods Crowns were milled using a computer-aided design/computer-aided manufacturing system. Marginal gaps (MGs), absolute marginal discrepancy (AMD), axial gaps, and occlusal gaps were measured by X-ray microtomography (n=8). For fracture load testing, crowns were cemented in a universal abutment, and divided into four groups: ZLS without TMA, ZLS with TMA, LDS without TMA, and LDS with TMA (n=10). TMA groups were subjected to 10,000 thermal cycles (5-55°C) and 1,000,000 mechanical cycles (200 N, 3.8 Hz). All groups were subjected to compressive strength testing in a universal testing machine at a crosshead speed of 1 mm/min until failure. Student’s t-test was used to examine misfit, two-way analysis of variance was used to analyze fracture load, and Pearson’s correlation coefficients for misfit and fracture load were calculated (α=0.05). The materials were analyzed according to Weibull distribution, with 95% confidence intervals.Results Average MG (p<0.001) and AMD (p=0.003) values were greater in ZLS than in LDS crowns. TMA did not affect the fracture load of either material. However, fracture loads of ZLS crowns were lower than those of LDS crowns (p<0.001). Fracture load was moderately correlated with MG (r=-0.553) and AMD (r=-0.497). ZLS with TMA was least reliable, according to Weibull probability.Conclusion Within the limitations of this study, ZLS crowns had lower fracture load values and greater marginal misfit than did LDS crowns, although these values were within acceptable limits.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

et al. 2017

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“…Water can penetrate in a surface defect resulting in a rupture of the metallic oxides bonds, leading to the formation of hydroxyls 28 . This phenomenon, known as slow crack growth (SCG), can control the time in service of the restoration 29 . However, the short period to perform three-point flexural test may be insufficient to induce SCG, but the test becomes more challenging and the material more susceptible to fast crack growth.…”

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confidence: 99%

Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

et al. 2017

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To solve chipping of veneer porcelain in zirconia dental prosthesis it has been studied different cooling rates in firing schedules to control residual stresses generated by differences in thermal properties between the ceramics. However, cooling rates may affect the porcelain, irrespectively of interaction with zirconia. This study analyzed the effect of cooling rate on the three-point flexural strength (FS), residual stress, Vickers hardness (VH) and V-notch fracture toughness (SEVNB) on a feldspathic porcelain (Vita VM9) indicated for covering zirconia. Bar-shaped specimens were sintered according manufacturer's schedule firing and cooled at different rates (slow, normal or fast). Specimens were tested for FS (n=30), VH (n=15) and SEVNB tests (n=15). Weibull analysis were performed from FS values to measure reliability and probability of failure (PF). One-way ANOVA was significant for VH (p<0.001), and Tukey's test showed that slow cooling led to higher values. There was no significant difference for FS (p=0.654) and SEVNB (p=0.734). Fast cooling led to the lowest PF, but cooling rate factor was not significant for Weibull modulus. All cooling group showed residual tensile stress (MPa): Slow = 34.81; Normal = 27.04; Fast = 18,98. It was concluded that cooling rate produce minor changes in the porcelain properties.

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Impact of erosion and aging simulation on chairside materials

Mourouzis,

Tsiveli,

Tsetseli

et al. 2023

Microscopy Res & Technique

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This study investigates the influence of acid exposure and thermocycling simulating erosion tooth wear, on the optical properties and surface roughness of chairside materials. Resin‐ceramic, lithium disilicate, premium zirconium oxide and resin composite material comprise the materials tested. To simulate the dental erosion and aging, specimens from each material were immersed in hydrochloric acid, while the thermocycling procedure included 10,000 cycles. The translucency, the color differences and the surface roughness were calculated. The materials phase composition was tested using X‐ray diffraction analysis to evaluate T‐M phase transformation. The CIEDE2000 color difference and the translucency parameter were tested different significantly among groups. Data were statistically analyzed via independent samples t‐test, and paired samples t‐test. The thermocycling procedure and the exposure to the acid solution had different effect on the surface roughness of CAD/CAM materials. The present result demonstrated the negative effect the acid exposure has on the zirconia material in terms of color difference. However, no color differences over the threshold of acceptability were recorded after the thermocycling procedure. Both polymer materials exhibit an increase of the surface roughness when they were immersed in acid but they did not display an increase in roughness when they were thermocycled.

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Microstructure characterization and SCG of newly engineered dental ceramics

Cited by 169 publications

References 10 publications

Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

Impact of erosion and aging simulation on chairside materials

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