Do thermal treatments affect the mechanical behavior of porcelain-veneered zirconia? A systematic review and meta-analysis

Rodrigues, Camila da Silva; Aurélio, Iana Lamadrid; Kaizer, Marina R.; May, Liliana Gressler

doi:10.1016/j.dental.2019.02.016

Cited by 17 publications

(4 citation statements)

References 58 publications

(96 reference statements)

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“…The minimum thickness suitable for monolithic Y-TZP restorations is 0.5 mm [134]; as regards layered prostheses, the total thickness ranges between 1.0 and 1.5 mm [134,[145][146][147][148][149]. In order to optimize mechanical resistance of layered restorations, it is paramount that veneering ceramics exhibit zirconia-compatible CTE [128,150].…”

Section: Manufacturing Proceduresmentioning

confidence: 99%

Current status on lithium disilicate and zirconia: a narrative review

et al. 2019

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Background: The introduction of the new generation of particle-filled and high strength ceramics, hybrid composites and technopolymers in the last decade has offered an extensive palette of dental materials broadening the clinical indications in fixed prosthodontics, in the light of minimally invasive dentistry dictates. Moreover, last years have seen a dramatic increase in the patients' demand for non-metallic materials, sometimes induced by metal-phobia or alleged allergies. Therefore, the attention of scientific research has been progressively focusing on such materials, particularly on lithium disilicate and zirconia, in order to shed light on properties, indications and limitations of the new protagonists of the prosthetic scene. Methods: This article is aimed at providing a narrative review regarding the state-of-the-art in the field of these popular ceramic materials, as to their physical-chemical, mechanical and optical properties, as well as to the proper dental applications, by means of scientific literature analysis and with reference to the authors' clinical experience. Results: A huge amount of data, sometimes conflicting, is available today. Both in vitro and in vivo studies pointed out the outstanding peculiarities of lithium disilicate and zirconia: unparalleled optical and esthetic properties, together with high biocompatibility, high mechanical resistance, reduced thickness and favorable wear behavior have been increasingly orientating the clinicians' choice toward such ceramics. Conclusions: The noticeable properties and versatility make lithium disilicate and zirconia materials of choice for modern prosthetic dentistry, requiring high esthetic and mechanical performances combined with a minimal invasive approach, so that the utilization of such metal-free ceramics has become more and more widespread over time.

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Section: Manufacturing Proceduresmentioning

confidence: 99%

Current status on lithium disilicate and zirconia: a narrative review

et al. 2019

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“…Previous studies investigated different cooling processes ( 18 , 19 , 20 ). In the present one, four different cooling processes were performed after the application of the veneering ceramics.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the effects of thermal changes on the bond strength between zirconia framework and veneering ceramic during the firing process

Us¹,

Tuncelli²

2023

eor

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Purpose: The aim of this in-vitro study was to evaluate the effect of thermal changes to shear bond strength during the firing process of veneering porcelain on a zirconia framework. Materials and methods: Single yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) framework ceramic (Kavo Dental GmbH) and three different types of veneering ceramics (IPS e.max Ceram, Vita VM9, and GC Initial Zr-FS) were used. One-hundred-twenty standard disc-shaped samples were prepared from zirconia blocks by using a CAD/CAM system (Kavo Everest). Four different cooling processes (maximum, 25°C/min, 50°C/min and 75°C/min) were applied to the veneering ceramics and the shear bond strength (SBS) test was performed. Ceramic surfaces were investigated by using scanning electron microscopeic (SEM). The possible occurrence of a t–m transformation of zirconia was evaluated by X-Ray Diffraction (XRD). Two-way analysis of variance, Bonferroni correction and paired comparisons were used for statistical analysis. Results: The main effects of veneering ceramics on shear bond strength were found to be significant (p=0.042). The mean shear bond strength values differ according to the cooling process (p<0.001). The monoclinic phase ratio increased in groups with fast cooling process. Conclusion: The thermal changes during the firing process of veneering porcelain on a zirconia framework influenced the shear bond strength of the all-ceramic bilayered system. A slow cooling process provided higher strength for bilayer ceramic samples.

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“…It is possible that t-m phase transformation due to moisture of the porcelain slurry may have led to compressive stresses, eventually increasing the load to failure [ 46 ]. Another possible explanation might be an improved hardness, density and surface without irregularities and defects due to the increasing number of firings during the veneering process [ 47 , 48 ]. Moreover, the different restorative designs might have an impact on force absorption and stress distribution, ultimately leading to different failure loads.…”

Section: Discussionmentioning

confidence: 99%

Failure Load and Fatigue Behavior of Monolithic and Bi-Layer Zirconia Fixed Dental Prostheses Bonded to One-Piece Zirconia Implants

et al. 2022

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No evidence-based prosthetic treatment concept for 3-unit fixed-dental-prostheses (FDPs) on ceramic implants is currently available. Therefore, the aim of this in vitro study was to investigate the failure load and fatigue behavior of monolithic and bi-layer zirconia FDPs supported by one-piece ceramic implants. Eighty 3-unit FDPs supported by 160 zirconia-implants (ceramic.implant; vitaclinical) were divided into 4 groups (n = 20 each): Group Z-HT: 3Y-TZP monolithic-zirconia (Vita-YZ-HT); Group Z-ST: 4Y-TZP monolithic-zirconia (Vita-YZ-ST); Group FL: 3Y-TZP zirconia (Vita-YZ-HT) with facial-veneer (Vita-VM9); Group RL (Rapid-layer): PICN “table-top” (Vita-Enamic), 3Y-TZP-framework (Vita-YZ-HT). Half of the test samples (n = 10/group) were fatigued in a mouth-motion chewing-simulator (F = 98 N, 1.2 million-cycles) with simultaneous thermocycling (5–55 °C). All specimens (fatigued and non-fatigued) were afterwards exposed to single-load-to-failure-testing (Z010, Zwick). Statistical analysis was performed using ANOVA, Tukey’s post-hoc tests and two-sample t-tests (p < 0.05, Bonferroni-corrected where appropriate). All specimens withstood fatigue application. While the effect of fatigue was not significant in any group (p = 0.714), the choice of material had a significant effect (p < 0.001). Material FL recorded the highest failure loads, followed by Z-ST, Z-HT and RL, both with and without fatigue application. Taken together, all tested FDP material combinations survived chewing forces that exceeded physiological levels. Bi-Layer FL and monolithic Z-ST showed the highest resilience and might serve as reliable prosthetic reconstruction concepts for 3-unit FDPs on ceramic implants.

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Do thermal treatments affect the mechanical behavior of porcelain-veneered zirconia? A systematic review and meta-analysis

Cited by 17 publications

References 58 publications

Current status on lithium disilicate and zirconia: a narrative review

Current status on lithium disilicate and zirconia: a narrative review

Evaluation of the effects of thermal changes on the bond strength between zirconia framework and veneering ceramic during the firing process

Failure Load and Fatigue Behavior of Monolithic and Bi-Layer Zirconia Fixed Dental Prostheses Bonded to One-Piece Zirconia Implants

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