Effect of different treatments on the flexural strength of fully versus partially stabilized monolithic zirconia

Sulaiman, Taiseer A.; Abdulmajeed, Aous A.; Shahramian, Khalil; Lassila, Lippo

doi:10.1016/j.prosdent.2016.10.031

Cited by 87 publications

(56 citation statements)

References 18 publications

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“…The lack of this mechanism is the primary factor in decreased FS and increased FS degradation of these materials. 20 The higher grain size found in the cubic containing zirconia materials may also contribute to the decreased FS and flexural fatigue strength values. Larger grain sizes can contribute to lower mechanical behaviors under static and fatigue assessments as smaller grain sizes require a higher applied stress to induce fracture.…”

Section: Discussionmentioning

confidence: 99%

Assessing Flexural Strength Degradation of New Cubic Containing Zirconia Materials

Holman

Lien

Gallardo

et al. 2020

The Journal of Contemporary Dental Practice

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Aim: Newer zirconia materials may have greater strength degradation under cyclic fatigue with increased yttria and cubic content. The purpose of this study was to evaluate the flexural strength (FS) degradation of newer zirconia materials compared to more traditional tetragonal zirconia materials. Materials and methods: The following materials were tested: two 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) materials (Lava Plus, 3M ESPE; Katana ML, Kuraray), one 4 mol% partially stabilized zirconia (4Y-PSZ) material (Katana STML, Kuraray), two 5 mol% partially stabilized zirconia (5Y-PSZ) materials (Katana STML, Kuraray; Lava Esthetic, 3M ESPE), and one lithium disilicate material (IPS e.max CAD LT, Ivoclar Vivadent). Thirty beams were milled for each ceramic material with final dimensions of 4.0 × 1.3 × 18.0 mm after sintering or crystallization. Each specimen was placed on a 3-point bend test device on a universal testing machine (Instron, Norwood, MA). Flexural strength was determined on 10 beam specimens per group with a central load applied until fracture. Flexural fatigue strength was then measured on the remaining 20 beam specimens per group using the staircase method for 6,000 cycles at 2 Hz. Data were analyzed with one-way ANOVAs/Tukey post hoc tests (α = 0.05). Results: A significant difference was found between groups (p < 0.001) per property. The 3Y-TZP zirconia materials had the greatest flexural and flexural fatigue strength. The cubic containing zirconia materials performed more moderately. The lithium disilicate material had the lowest strength values. The percent degradation in flexural fatigue strength of the 3Y-TZP zirconia materials was less than the 5Y-PSZ, Katana UTML, and the 4Y-PSZ, Katana STML, cubic containing materials, but similar to the 5Y-PSZ cubic containing material, Lava Esthetic. Conclusion: The amount of strength degradation was material dependent, with the 4Y-PSZ or 5Y-PSZ cubic containing zirconia materials demonstrating greater or similar strength degradation compared to the primarily tetragonal 3Y-TZP zirconia materials. Clinical significance: The differences in FS degradation between cubic containing materials and traditional zirconia materials could significantly impact the long-term success of these newer materials. Clinicians should be aware that these cubic containing materials may perform differently long-term than the very strong traditional 3Y-TZP materials and to follow manufacturer instructions on required material thickness and indications for use to prevent premature failure of the restoration.

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Section: Discussionmentioning

confidence: 99%

Assessing Flexural Strength Degradation of New Cubic Containing Zirconia Materials

Holman

Lien

Gallardo

et al. 2020

The Journal of Contemporary Dental Practice

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“…While the strongest and toughest of the dental ceramics, Y-TZP is nevertheless not entirely immune to clinical failure over time [15-19]. This is an important consideration as new-generation zirconia materials with improved translucency (but potentially compromised strength and/or toughness) are developed [9,12,14,20-25]. Elucidation of fracture and deformation mechanisms in these materials thereby holds the key to prolonged lifetimes of next-generation dental prostheses.…”

Section: Introductionmentioning

confidence: 99%

Evaluating dental zirconia

2019

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“…The flexural strength of all samples was measured using three-point bending test. 15,16 Load was applied by a cylindrical rod to the center of bar-shaped samples positioned on two supports until fracture. Due to stress accumulation at the center of rod prior to fracture of the sample, first, a V-shaped deformation occurs at the site of load application.…”

Section: Flexural Strength Testingmentioning

confidence: 99%

Flexural strength of polyether ether ketone high-performance polyether in comparison with base metal alloy and Zirconia ceramic

et al. 2020

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Optimal flexural strength is a critical prerequisite for prosthetic frameworks. This study aimed to assess the flexural strength of polyether ether ketone (PEEK) polymer compared to a base metal alloy and highstrength Zirconia ceramic commonly used in prosthodontic treatments. Materials and Methods: In this in vitro, experimental study, 10 bar-shaped samples measuring 18×5×2mm were fabricated of each the PEEK polymer, nickel-chromium base metal alloy and zirconia ceramic. Half of the samples in each group were subjected to 5000 thermal cycles between 5°C-55°C with 20 seconds of dwell time and 20 seconds of transfer time to simulate oral conditions. All samples then underwent three-point bending test. Two-way ANOVA followed by Tukey's test were applied to compare the mean flexural strength of the groups with and without thermocycling at 0.05 level of significance. Results: The flexural strength of base metal alloy, Zirconia and PEEK was 1387.70±45.50 MPa, 895.13±13.99 MPa and 192.10±5.37 MPa, respectively. The difference was significant among the groups (p<0.001). Thermocycling had no significant effect on the flexural strength of samples in any group (p=0.306). Conclusion: PEEK high-performance polymer had a lower flexural strength than base metal alloy and Zirconia ceramic, and its flexural strength was not affected by thermocycling. PEEK seems to be able to resist masticatory forces in the oral cavity pending further in vitro and clinical studies.

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Effect of different treatments on the flexural strength of fully versus partially stabilized monolithic zirconia

Cited by 87 publications

References 18 publications

Assessing Flexural Strength Degradation of New Cubic Containing Zirconia Materials

Assessing Flexural Strength Degradation of New Cubic Containing Zirconia Materials

Evaluating dental zirconia

Flexural strength of polyether ether ketone high-performance polyether in comparison with base metal alloy and Zirconia ceramic

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