Fracture Load Before and After Veneering Zirconia Posterior Fixed Dental Prostheses

Rodríguez, Verónica; Castillo-Oyagüe, Raquel; López-Suárez, Carlos; Gonzalo, Esther; Peláez, Jesús; Suárez-García, María-Jesús

doi:10.1111/jopr.12357

Cited by 20 publications

(68 citation statements)

References 28 publications

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“…The abutments were positioned on the base to receive posterior 3‐unit FPDs with an intermediate pontic, such that one simulated a first mandibular premolar, and the other simulated a first mandibular molar. The abutments were designed with the following characteristics to simulate clinical conditions: 5 mm in height, 1‐mm wide chamfer, a 6° angle of convergence of the axial walls, and rounded angles . They were air‐abraded with 100 μm alumina particles to eliminate the surface brightness and to create micromechanical retention.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

López-Suárez

Tobar

Solá-Ruíz

et al. 2019

Journal of Prosthodontics

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Purpose To evaluate the influence of static (not preloaded) and thermomechanical loading on the load to fracture of metal‐ceramic, monolithic and veneered zirconia computer‐aided design/computer‐aided manufacturing (CAD/CAM) posterior fixed partial dentures (FPDs). Materials and Methods One hundred standardized specimens with 2 abutments screwed onto a platform were prepared from stainless steel to receive a posterior 3‐unit FPD with an intermediate pontic. Specimens were randomly divided into 5 groups (n = 20): Metal‐ceramic (control group), Lava Zirconia system, Vita In‐Ceram YZ, IPS e.max ZirCAD, and Lava Plus. Half of the specimens of each group (n = 10) underwent no preloading, and the other half were subjected to thermomechanical loading in a masticatory simulator, and then all FPDs were loaded until fracture using a universal testing machine at a 1 mm/min crosshead speed. The load to fracture of the veneering ceramic and the load to fracture of framework (total fracture) were recorded for each specimen. Data were statistically analyzed using 2‐way ANOVA, Tukey's HSD post‐hoc test, Student's t test, and Weibull statistics, α = 0.05. Results Significant differences were recorded between the metal‐ceramic and veneered zirconia groups for the veneering ceramic load (p < 0.001; f = 36.62; f = 57.76) in no preloading and thermomechanical loading subgroups, respectively, but no differences were observed between the static and thermomechanical loading conditions. No differences were observed among the veneered zirconia groups. For the total load to fracture, significant differences were observed according to the material (p < 0.001; f = 500.8), between the metal‐ceramic and Lava Plus group and the other zirconia groups in no preloading subgroup, and between metal‐ceramic and the other groups (p < 0.001; f = 303.33) in thermomechanical loading subgroup. For the type of preloading, significant differences were observed (p = 0.02; f = 5.24) between the Lava Plus group and the other groups. Thermomechanical loading significantly decreased the fracture load of the Lava Plus group (p = 0.005). The Weibull statistics corroborated the results. Conclusions Monolithic zirconia restorations provided the highest load to fracture values among the zirconia groups tested; however, the results indicate that they must be used in the oral environment with caution, because their load to fracture was influenced by the aging simulation.

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Section: Methodsmentioning

confidence: 99%

“…Zirconia possess low translucency, and the opaque white frameworks must be veneered with porcelain to improve esthetics . The core/veneer interface is one of the weakest aspects of these restorations.…”

mentioning

confidence: 99%

Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

López-Suárez

Tobar

Solá-Ruíz

et al. 2019

Journal of Prosthodontics

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“…The sample numbers were small, although power analysis indicated that 10 samples per group were sufficient. Micro-structural variations of natural teeth preparations and other subsequent variables related to impression, pouring techniques and prescriptions 37,38) were avoided by using standardized metallic models 2,6,12,19,39) , although this not reflects the clinical situation. The conditions of thermal cycles meet the requirements of the ISO TR 11450, however and although there is a lack of standardization, several studies recommend that more cycles are needed 16,17,20,29,40) .…”

Section: Discussionmentioning

confidence: 99%

“…Axial compressive loads were exerted by sliding a coneshaped stainless-steel bar (length: 12 mm) finished in a rounded tip (diameter: 1 mm) adapted to the UTM. This customized load piston was perpendicularly applied at the central fossa of each pontic until the fracture of the vennering ceramic in the Lava Zirconia group and the total fracture of the restorations in both groups, defined as a sharp decrease in the stress plot 6) . The results were recorded using inbuilt software for the testing machine (PCD2K, SERVOSIS), and force (N)-displacement (mm) curves were automatically created.…”

Section: Fracture Load Testmentioning

confidence: 99%

“…Therefore, research focused interest on computer aided design-computer aided manufacturing (CAD/CAM) zirconia ceramic [1][2][3] . Zirconia ceramic has excellent mechanical properties 4,5) , however is highly opaque due to its completely crystalline microstructure, thus the framework must be covered with veneering porcelain for more acceptable esthetic outcome 6) . But regardless of the high strength of the zirconia ceramic, one of the most important clinical problems is the chipping of the veneering ceramic according to the different clinic studies 3,[7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

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Comparative fracture behavior of monolithic and veneered zirconia posterior fixed dental prostheses

et al. 2017

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The purpose of this study was to evaluate and to compare the fracture load and the fracture pattern of monolithic and veneered zirconia posterior fixed dental prostheses (FDPs). Twenty standardized steel dies were prepared to receive posterior 3-unit FDPs. Specimens were randomly divided into 2 groups (n=10): (1) Lava Zirconia, and (2) Lava Plus. All FDPs were cemented using glass ionomer cement and subjected to thermal and mechanical cycling at 5-55ºC with a 30-s dwell time for 120,000 masticatory cycles. All specimens were subjected to a three-point bending test until fracture. Data were statistically analyzed using Student's t test, paired t-test and Weibull statistics (α=0.05). No differences were observed in fracture load between the groups. Veneering ceramic fractured before than framework in veneered zirconia group. The fracture pattern was different. The tested groups demonstrated clinically acceptable fracture load values. Monolithic zirconia solves the chipping problem.

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Randomized clinical trial comparing monolithic and veneered zirconia three-unit posterior fixed partial dentures in a complete digital flow: three-year follow-up

et al. 2022

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Objectives To evaluate and to compare the clinical performance and survival rate of posterior monolithic and veneered zirconia fixed partial dentures (FPDs). Material and methods Sixty 3-unit posterior FPDs were included in the study. The patients were randomly distributed into two groups (n = 30 each) to receive either a monolithic (Zenostar T, Wieland Dental) or veneered zirconia (IPS e.max ZirCAD, Ivoclar Vivadent) FPD. Each patient received only 1 FPD. Tooth preparations were scanned (Trios 3, 3Shape), designed (Dental System 2016, 3 Shape), milled (Zenotec CAM 3.2, Wieland Dental), and cemented with a resin cement. Technical and biological outcomes and periodontal parameters were assessed. Data analysis was made using the Friedman and the Wilcoxon signed-rank tests with the Bonferroni correction and the Mann-Whitney U test. ResultsThe survival rate at 3 years was 100% for veneered and 90% for monolithic zirconia restorations. Three monolithic zirconia FPDs were lost because of biologic complications. The main complication in the veneered zirconia FPDs was the fracture of the veneering ceramic in 4 of the veneered zirconia FPDs. No fracture of the frameworks was observed in any of the groups. All restorations were assessed as satisfactory after 3 years. No differences in periodontal parameters were observed between the groups. Conclusions The results of this study suggest that monolithic zirconia and complete digital flow could be a viable alternative to veneered zirconia in the posterior regions. Clinical relevance The monolithic zirconia restorations with a digital workflow can be a viable alternative in posterior fixed partial dentures, with good periodontal outcomes. Clinical trial registration number ClinicalTrials.gov (Identifier NCT 04,879,498).

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Fracture Load Before and After Veneering Zirconia Posterior Fixed Dental Prostheses

Cited by 20 publications

References 28 publications

Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

Comparative fracture behavior of monolithic and veneered zirconia posterior fixed dental prostheses

Randomized clinical trial comparing monolithic and veneered zirconia three-unit posterior fixed partial dentures in a complete digital flow: three-year follow-up

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