Effect of in vitro aging on the flexural strength and probability to fracture of Y-TZP zirconia ceramics for all-ceramic restorations

Siarampi, Eleni; Kontonasaki, Eleana; Andrikopoulos, Konstantinos S.; Kantiranis, Nikolaos; Voyiatzis, George A.; Zorba, T.; Paraskevopoulos, K. M.; Koidis, Petros

doi:10.1016/j.dental.2014.05.033

Cited by 71 publications

(36 citation statements)

References 44 publications

(51 reference statements)

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“…In the case of non-symmetrical lamina test bending and twisting tests can be complicated by partial detachments of the specimen from the supports, caused by the torsional deformation. In such cases, in order to minimize the effects on the outcome of the test, you must use relatively large specimens (10)(11)(12)15). Using a machine from Test Equipment Instron 5566 ® , three point bending tests were performed on 12 specimens zirconium-ceramic (Figure 8).…”

Section: Figurementioning

confidence: 99%

Sem analysis zirconia-ceramic adhesion interface

Cardelli¹

2015

ORL

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SUMMARYObjectives. Modern dentistry increasingly tends to use materials aesthetically acceptable and biomimetic. Among these are zirconia and ceramics for several years, a combination that now has becoming synonym of aesthetic; however, what could be the real link between these two materials and especially its nature, remains a controversial topic debated in the literature. The aim of our study was to "underline" the type of bonding that could exist between these materials. Materials and methods. To investigate the nature of this bond we used a SEM microscopy (Zeiss SUPRA 25). Different bilaminar specimens: "white" zirconia Zircodent® and ceramic "Noritake®", after being tested with loading test in bending (three-point-bending) and FEM analysis, were analyzed by SEM. Fragments' analysis in closeness of the fracture's point has allowed us to be able to "see" if at large magnifications between these two materials, and without the use of linear, could exist a lasting bond and the possible type of failure that could incur.Results. From our analysis of the specimens' fragments analyzed after test Equipment, it is difficult to highlight a clear margin and no-adhesion zones between the two materials, although the analysis involving fragments adjacent to the fracture that has taken place at the time of Mechanical test Equipment. Conclusions. According to our analysis and with all the clarification of the case, we can assume that you can obtain a long and lasting bond between the zirconia and ceramics. Agree to the data present in the literature, we can say that the type of bond varies according to the type of specimens and of course also the type of failure. In samples where the superstructure envelops the ceramic framework Zirconium we are in the presence of a cohesive failure, otherwise in a presence of adhesive failure.

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Section: Figurementioning

confidence: 99%

Sem analysis zirconia-ceramic adhesion interface

Cardelli¹

2015

ORL

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“…This metastable phase is able to undergo stress-induced transformation thanks to the high stresses arising in front of a crack under external loading. The product is the stable monoclinic phase, which has a specific volume approximately 4.5% higher monotonic and cyclic loading seems to be limited and dependent on the aging time [11,12], this issue is still a matter of concern [13][14][15] and represents an impediment to the development of allceramic dental systems. Better solutions are therefore needed to overcome the problem, which is the subject of this work.…”

Section: Introductionmentioning

confidence: 99%

Enhanced reliability of yttria-stabilized zirconia for dental applications

et al. 2015

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An increasing number of dental applications based on yttria-stabilized zirconia (3Y-TZP) have been developed in recent years as a result of the advances and versatility of dry-processing and soft machining at the pre-sintered state. Nonetheless, the long-term surface stability of these materials in humid environment is still a matter of concern and may limit its application. In this work, a simple method to prevent hydrothermal degradation on zirconia surface is studied in detail. This method involves the infiltration of pre-sintered parts with optimized solutions containing Ce salts, leaving unchanged the other processing steps, allowing the diffusion of Ce during conventional sintering. Several pre-sintering conditions, solution concentrations and sintering temperatures were studied and characterized, obtaining working parameters for the production of zirconia parts with mechanical properties similar to standard 3Y-TZP and high resistance to hydrothermal aging. This optimal combination was obtained with the 1150 ºC pre-sintering temperature, 50 wt% solution and sintering at 1450 ºC, leading to a superficial CeO 2 content of about 3 mol%.

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“…Biaxial flexural strength tests have several advantages to [31][32][33] . Some studies showed a number of factors affecting the mechanical properties of the layered all-ceramic materials, such as temperature and moisture 11,26,28,34) . In the oral environment, all-ceramic materials are prone to aging which can lead all-ceramic materials to change color, to lower bending strength, and to reduce antifracture toughness.…”

Section: Introductionmentioning

confidence: 99%

“…Clinically, an appropriate strength characteristics is an important aspect of dental restoration. According to previous studies, the long-term strength properties of all-ceramic restorations depend upon several factors, such as fabrication type [14][15][16][17] , laboratory procedures [18][19][20][21] , core or veneer thickness 4,7,22) , fatique resistance 23) , luting procedure 24,25) , and aging 11,14,[26][27][28] . Thus, it is important to determine the mechanical behavior of this category of dental materials in vitro.…”

Section: Introductionmentioning

confidence: 99%

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

et al. 2017

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The purpose of this study was to investigate the flexural strength of all-ceramics with varying core thicknesses submitted to aging. In-Ceram Alumina (IC), IPS e.max Press (EM) and Katana (K) (n=40), were selected. Each group contained two core groups based on the core thickness as follows: IC/0.5, IC/0.8, EM/0.5, EM/0.8, K/0.5 and K/0.8 mm in thickness (n=20 each). Ten specimens from each group were subjected to aging and all specimens were tested for strength in a testing machine either with or without being subjected aging. The mean strength of the K were higher (873.05 MPa) than that of the IC (548.28 MPa) and EM (374.32 MPa) regardless of core thickness. Strength values increased with increasing core thickness for all IC, EM and K regardless of aging. Results of this study concluded that strength was not significantly affected by aging. Different core thicknesses affected strength of the all-ceramic materials tested (p<0.05).

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Effect of in vitro aging on the flexural strength and probability to fracture of Y-TZP zirconia ceramics for all-ceramic restorations

Cited by 71 publications

References 44 publications

Sem analysis zirconia-ceramic adhesion interface

Sem analysis zirconia-ceramic adhesion interface

Enhanced reliability of yttria-stabilized zirconia for dental applications

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

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