Influence of aging on flexural strength of translucent zirconia for monolithic restorations

Flinn, Brian D.; Raigrodski, Ariel J.; Mancl, Lloyd; Toivola, Ryan; Kuykendall, Tuesday

doi:10.1016/j.prosdent.2016.06.010

Cited by 111 publications

(97 citation statements)

References 40 publications

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“…In the present study, the depth of transformation varied between different materials and only occurred in a superficial layer of the material. is finding is also supported by a previous study [13]. e finding that the flexural strength of the Y-TZP after aging remained unchanged could be attributed to the relatively small transformation depth of the aged materials.…”

Section: Discussionsupporting

confidence: 87%

“…is laboratory study was therefore designed to evaluate the aging behavior of Y-TZP colored with different coloring approaches using a hydrothermal aging process. Published studies have a wide variability in aging protocols, and up to 200 h hydrothermal aging has been adopted in the literature [13]. Chevalier et al [14,25] proposed that aging in the autoclave at 134°C and 0.2 MPa for 5 h is equivalent to 15-20 years of in vivo use Journal of Spectroscopy 3 based on the amount of t→m transformation.…”

Section: Discussionmentioning

confidence: 99%

“…However, this extent of phase transformation failed to significantly affect the biaxial flexural strength of the Y-TZP tested [12]. Moreover, Flinn et al [13] reported a significant correlation between the decrease in the flexural strength and the increase in V m for certain types of Y-TZP (Prettau and BruxZir). e literature indicates that the resistance to LTD of Y-TZP is materialdependent.…”

Section: Introductionmentioning

confidence: 96%

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Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

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Objective.is study aimed to investigate the effect of different coloring procedures on the aging behavior of dental monolithic zirconia. Methods. Two types of translucent zirconia (SuperfectZir HTS, Aidite; Katana HT, Kuraray) were tested. Bar-shaped specimens with dimensions of 22 × 4 × 2 mm were prepared from uncolored and precolored blocks. Before being sintered, specimens made from uncolored blocks were colored by dipping them into a coloring liquid, whereas the precolored specimens were not treated. e specimens were then divided into 4 subgroups (n � 13) according to the aging conditions (no aging, 134°C/0.2 MPa for 5 h, 134°C/0.2 MPa for 10 h, and 134°C/0.2 MPa for 20 h). e flexural strength of the specimens was tested with the 4-point flexure. e crystalline phase composition of the specimens was analyzed by XRD. e subsurface microstructure of the fractured specimens was examined by using a SEM. e data were statistically analyzed using 3-way ANOVA and Tukey's test (α � 0.05). Results. Significant differences were found in the flexural strength between the two zirconia materials tested (P < 0.001). Aging and coloring procedures showed no significant effect on the flexural strength of the zirconia. Aging and coloring procedures significantly affected the t→m transformation of the zirconia. e monoclinic phase increased with the aging time. After aging, the precolored specimens showed a significantly higher t→m transformation than the specimens that were dipped in the coloring liquids. After aging for 20 h, the depth of the transformed zone with an irregular surface was approximately 6 µm for SuperfectZir HTS, whereas no detectable transformation zone was observed for Katana HT. Conclusion. Aging and coloring procedures had no significant effects on the flexural strength of the zirconia tested. e coloring procedure had a significant effect on the phase transformation of the zirconia subjected to hydrothermal aging.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Agingu

Jiang

Cheng

et al. 2018

Journal of Spectroscopy

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“…As expected for a composite material, the properties are intermediate between those of ceramics and particle-filled resins. 60,61,63 The elastic modulus of these materials is in the range of 30 GPa, which is half of that reported for conventional veneering ceramics but closer to what is usually reported for dentin (15)(16)(17)(18)(19)(20). 58,63 Typical ceramic materials have a higher elastic modulus values than PICN 64 .…”

Section: Polymer Infiltrated Ceramic Network (Picns)mentioning

confidence: 61%

“…Their results indicated that some brands are not susceptible to aging while others are more prone to tretragonal-to-monoclinic (t-m) transformation. 19,20 However, more studies are needed to evaluate this ageing phenomenon, since to date there is no scientific evidence from clinical studies linking the clinical failure of dental Y-TZP with this type of ageing.…”

Section: Monolithic Zirconia Restorationsmentioning

confidence: 99%

Dental ceramics: a review of new materials and processing methods

et al. 2017

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The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.

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Comparative assessment of flexural strength of monolithic zirconia with different thicknesses and two sintering techniques

Karbasian,

Fathi,

Givehchian

et al. 2024

Clinical & Exp Dental Res

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ObjectivesThis study aimed to compare the flexural strength of monolithic zirconia with different thicknesses and two sintering techniques.Materials and MethodsThis in vitro, experimental study was conducted on 28 monolithic zirconia discs with 10 mm diameter and 0.5 (n = 14) and 1.2 mm (n = 14) thickness. Each group was divided into two subgroups (n = 7) for fast (60 min) and conventional (120 min) sintering at 1450°C. After sintering, the specimens were thermocycled and their flexural strength was measured by piston‐on‐3‐balls technique in a universal testing machine (0.5 mm/min, 1.2 mm pin diameter). Data were analyzed by the Weibull test, one‐way analysis of variance, and Tukey's test (α = .05).ResultsThe flexural strength of specimens with 1.2 mm thickness was significantly higher than that of specimens with 0.5 mm thickness (p < .05). The flexural strength of 1.2 mm/120‐min group was slightly, but not significantly, higher than that of 1.2 mm/60‐min group (p > .05). The flexural strength of 0.5 mm/120‐min group was slightly, but not significantly, higher than that of 0.5 mm/60‐min group (p > .05).ConclusionThe increase in thickness of monolithic zirconia increases its flexural strength; however, increasing the sintering time appears to have no significant effect on the flexural strength of monolithic zirconia.

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Influence of aging on flexural strength of translucent zirconia for monolithic restorations

Cited by 111 publications

References 40 publications

Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Effect of Different Coloring Procedures on the Aging Behavior of Dental Monolithic Zirconia

Dental ceramics: a review of new materials and processing methods

Comparative assessment of flexural strength of monolithic zirconia with different thicknesses and two sintering techniques

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