Effect of Aging on Translucency and Flexural Strength of Different Zirconia Materials (An In-Vitro Study)

Alzebdah, Amr; Hamdy, Ahmed; Naguib, Alaa

doi:10.21608/edj.2021.76742.1641

Cited by 1 publication

(1 citation statement)

References 15 publications

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“…Our results are in agreement with EL Galab et al (2023) [42] who experimentally proved that the conventional cycle had significantly higher translucency values than speed cycle regarding the studied zirconia. Moreover, Lawson et al (2020) [41] confirmed reduction in translucency after speed sintering of both 3Y-TZP and 4YTZP compared to conventional sintering, they explained the lower translucency after speed sintering by the fact that higher temperatures and shorter sintering time resulted in higher particle density which reduced pore spaces during phase transformation and grain growth. Regarding the results of Biaxial flexural strength the null hypothesis was accepted results revealed significant variations between the tested groups in the speed cycle and conventional cycle, with IPS e.max Zircad prime having the greatest value, with significant difference than BruxZir anterior, and Katana having the lowest value.…”

Section: Discussionmentioning

confidence: 98%

Effect of two sintering protocols on translucency and flexural strength of different monolithic zirconia materials: An In vitro study

Zohd,

Taha,

Dakkak

2024

Int. J. Appl. Dent. Sci.

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Background: Dental ceramics and zirconia are increasingly being used with outstanding outcomes for various restorations such as fixed dental prosthesis, resin bonded FDPs, and implant restorations. Zirconia is a polymorphic ceramic that can be found in three various crystalline forms depending on temperature: monoclinic, tetragonal, and cubic. The monoclinic phase is stable at room temperature; unfortunately, its mechanical and optical properties are insufficient for clinical application; nonetheless, the tetragonal and cubic phases can be rendered stable at room temperature by applying stabilizing oxides. The multi-layered technology has shown an improvement in color of zirconia to mimic the natural teeth without affecting its mechanical properties. Aim of the Study:The aim of this In vitro study is to evaluate the effect of two sintering protocols: Conventional firing cycle and Speed firing cycle on translucency and Flexural strength of the novel color gradient zirconia and compare it to different monolithic zirconia material. Materials and Methods: 54 discs were constructed to be divided into 3 different groups each group sub divided to speed cycle group and conventional cycle group for materials: IPS e.max® ZirCAD® Prime, Katana ultra-translucent zirconia and BruxZir anterior, To compensate for sintering shrinkage, the zirconia samples were milled with dimensions bigger than the required final dimension. The discs were then sintered in a sintering furnace group conventional sintering and group speed sintering for each material. Results: Translucency for conventional firing, there was a significant difference between different groups the highest value was found in Katana UTML, followed by Zircad prime, while the lowest value was found at BruxZir and for speed firing there was a significant difference between different groups. The highest value was found in Katana UTML, followed by Zircad prime, while the lowest value was found at BruxZir. Flexural strength for conventional firing, there was a significant difference between different groups. The highest value was found in Zircad prime, followed by BruxZir, while the lowest value was found at Katana UTML; and for speed firing, there was a significant difference between different groups. The highest value was found in Zircad prime, followed by BruxZir, while the lowest value was found at Katana UTML. Conclusion: For all tested zirconia, zirconia samples sintered with the conventional sintering cycle showed a significantly higher translucency value than those sintered with the speed cycle. Katana UTML zirconia showed the highest translucency values while BruxZir zirconia exhibited the lowest values in both firing methods.

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Section: Discussionmentioning

confidence: 98%