Effect of different loading pistons on stress distribution of a CAD/CAM silica-based ceramic: CAD-FEA modeling and fatigue survival analysis

Miranda, Jean Soares; Carvalho, Ronaldo Luís Almeida de; Carvalho, Rodrigo Furtado de; Borges, Alexandre Luiz Souto; Bottino, Marco Antônio; Özcan, Mutlu; Melo, Renata Marques de; Souza, Rodrigo Othávio de Assunção e

doi:10.1016/j.jmbbm.2019.03.011

Cited by 11 publications

(7 citation statements)

References 26 publications

(51 reference statements)

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“…It can be argued that tungsten carbide indenters may overestimate the fracture resistance of the ceramic material, failing to reflect its actual clinical behavior. 16 Unexpectedly, this study showed insignificant difference in the postfatigue fracture load between different indenter groups. These findings may initially suggest that using any of these commonly used indenter materials (stainless steel, steatite ceramic, or tungsten carbide) would not produce significantly different results compared with the other indenters.…”

Section: Discussionmentioning

confidence: 51%

“…This study showed that tungsten carbide indenter insignificantly reduced the fracture load of the fatigued specimens compared with the control group by only 15%, thus reducing the effect of mechanical and thermal cycling compared with other indenter groups. In a recent study, Miranda et al 16 evaluated the effect of using different loading pistons (epoxy resin, stainless steel and tungsten carbide) on fatigue survival (2 million cycles) of computer-aided design (CAD)/ computer-aided manufacturing (CAM) feldspathic porcelains. The group fatigued with tungsten carbide piston showed the highest survival rate (60%), followed by the stainless steel piston group (40%), and, finally, the epoxy resin piston group where only one specimen survived the fatigue test in this group.…”

Section: Discussionmentioning

confidence: 99%

“…14,15 Composite resin indenter is recommended in other studies because they are able to cause a more homogeneous stress distribution in the ceramic structure than other indenter materials such as tungsten carbide or steel indenters. 16 These materials are different in mechanical properties and the effect they can produce when used to load ceramic specimens. 7,11,14,17,18 Therefore, this study investigates the influence of the most commonly used indenter materials (ceramic, stainless steel, or tungsten carbide) on fatigue survival and fracture resistance of zirconia crowns.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

et al. 2020

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Objective This study investigates the influence of the most commonly used indenter materials on fatigue survival and fracture resistance of zirconia crowns. Materials and Methods A total of 40 zirconia crowns were prepared using computer-aided design (CAD)/computer-aided manufacturing (CAM) technology: 30 crowns were divided into three experimental groups of 10 specimens and the last 10 specimens acted as the control group. The experimental groups were subjected to chewing simulation with simultaneous thermocycling. Three indenter materials (steatite ceramic, stainless steel, and tungsten carbide) with identical diameter were used to load the specimens. All crowns were then subjected to single load to fracture test in universal testing machine. Load was applied vertically with a crosshead speed of 1 mm/min until failure, and fracture load was recorded. Statistical Analysis Normal distribution of data was confirmed using the Shapiro–Wilk test. Descriptive statistics including means and standard deviations were determined for all groups. Differences between groups were tested using Dunnett’s test and paired sample t-test. Results Chewing simulation for 1.2 million cycles resulted in 100% survival. The highest mean fracture load was recorded for the control group and the lowest one was for the group fatigued with stainless steel indenter. Chewing simulation statistically significantly (p < 0.05) reduced the mean fracture load of the crowns fatigued with stainless steel and steatite ceramic indenter. However, the mean fracture load for the crowns fatigued with tungsten carbide was not significantly different from that of the control group. Conclusion Steatite ceramic and stainless steel indenters produced close results and significantly reduced fracture load of zirconia crowns. However, tungsten carbide indenter caused nonsignificant reduction in the fracture load of zirconia crowns.

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

et al. 2020

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“…V12; Carl Zeiss, Göttingen, Germany), and then one representative disc from each group was chosen for scanning electron microscopy (SEM) analysis (FEI, Phillips, Brno, Czech Republic). The selected specimens were cleaned with 70% alcohol (Alves Santa Cruz Ltda., Guarulhos, SP, Brazil), dried, and coated with a thin layer (12 nm) of gold (EMITECH SC7620, East Sussex, United Kingdom) prior to SEM analysis 27 …”

Section: Methodsmentioning

confidence: 99%

Effect of Consecutive Firings on the Optical and Mechanical Properties of Silicate and Lithium Disilicate Based Glass‐Ceramics

Morais

Abu-Izze

Rossi

et al. 2021

Journal of Prosthodontics

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Purpose To evaluate the effect of multiple firings on the optical and mechanical properties of two dental CAD/CAM glass‐ceramics. Materials and Methods A total of 45 specimens of each lithium disilicate‐LD (IPS E.max CAD, Ivoclar Vivadent) and zirconia lithium silicate‐ZLS (Vita Suprinity, Vita Zahnfabrik) material were prepared in a disk shape. These specimens were divided into three groups according to two factors: “type of ceramic” (LD and ZLS) and “numbers of firings” (Control 2F‐two firings, 5F‐five firings and 7F‐seven firings). The firing cycles were performed according to the manufacturer's recommendations. X‐ray diffraction was additionally performed to determine crystalline phases in each group, spectrophotometry was used to determine color and translucency variation, and biaxial flexural strength (BFS) evaluated the mechanical behavior. The data were analyzed individually using two‐way ANOVA tests and Tukey's test at α = 0.05. Results The crystalline phases did not present any change after multiple firings for either of the analyzed materials. Both commercial materials showed a significant difference regarding translucency at 7F (p = <0.01), and ZLS presented a difference in color higher than one (ΔE > 1) at 5F and 7F. Regardless of the number of firings, LD presented a higher BFS compared to ZLS (p = <0.001), and a significant increase in BFS comparing 2F and 7F (p = <0.024). Conclusion The use of multiple firings can significantly alter the color, translucency, and mechanical strength of CAD/CAM ceramics.

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“…To predict the mechanical behavior of ceramic restorations and prevent clinical failures, data from laboratory studies are frequently used. However, there are several limitations in these studies, mainly related to the high amplitude of the load applied in the restorations, 3 , 6 , 7 the type of piston used to apply the load 8 - 11 , and the type of supporting substrate 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Fatigue-life and stress distribution of a glass-ceramic under different loading conditions

et al. 2023

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This study aimed to evaluate the effect of different loading conditions on the mechanical behavior and stress distribution of a leucite-reinforced glass-ceramic. Plate-shaped ceramic specimens were obtained from leucite-reinforced glass-ceramic (1.5 × 8.4 × 8.3 mm) and adhesively cemented to a dentin analog substrate. Monotonic and cyclic contact fatigue tests were performed to simulate sphere-to-flat contact, using a 6 mm diameter spherical piston; and flat-to-flat contact, using a 3 mm diameter flat piston. For the monotonic test (n=20), a gradual compressive load (0.5 mm/min) was applied to the specimen using a universal testing machine. Failure load data were analyzed with Weibull statistics. The cyclic contact fatigue test was performed using protocols (load and a number of cycles) defined by the boundary technique (n=30). Fatigue data were analyzed using an inverse power law relationship and Weibull-lifetime distribution. The stress distribution was investigated using Finite Element Analysis (FEA). The monotonic and the fatigue Weibull modulus were similar among the two contact conditions. In fatigue, the slow crack growth exponent was greater for sphere-to-flat contact, which indicates that the load level had a greater effect on the specimen’s probability of failure. In conclusion, FEA showed different stress distribution for the tested loading conditions. The stress distribution and probability of fatigue failure of specimens tested in sphere-to-flat contact showed greater dependency to load level.

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Effect of different loading pistons on stress distribution of a CAD/CAM silica-based ceramic: CAD-FEA modeling and fatigue survival analysis

Cited by 11 publications

References 26 publications

Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

Influence of Antagonist Material on Fatigue and Fracture Resistance of Zirconia Crowns

Effect of Consecutive Firings on the Optical and Mechanical Properties of Silicate and Lithium Disilicate Based Glass‐Ceramics

Fatigue-life and stress distribution of a glass-ceramic under different loading conditions

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