Translucency and Biaxial Flexural Strength of Monolithic Zirconia as Affected by Sintering Speeds

Sallam, Hanaa I.; Eldwakhly, Elzahraa

doi:10.21608/edj.2017.75207

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…Translucency parameter is defined by the color difference attained between the light reflected by an object of a known thickness and placed over two different black and white backgrounds [26][27][28] . The CR values is also an estimate for translucency of the material, with a range from (0.0 to 1.0) which resembles a material (transparent to totally opaque) 26 .…”

Section: Introductionmentioning

confidence: 99%

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Sami

2023

Egyptian Dental Journal

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Statement of the Problem: Alterations of pH in the oral cavity can lead to degradation of machinable esthetic materials that mimic the natural tooth appearance resulting in an esthetic failure. Hence, the stability of the optical and mechanical characteristics of these materials is essential for a long-term successful restoration.Aim of the Study: To evaluate the translucency, microhardness, and fracture toughness of two CAD/CAM materials (IPS e.max CAD and Vita Enamic) after immersion in two acidic beverages (Coffee and Coca-Cola).Materials and methods: A total of 36 samples were equally divided into two groups each (n=18) as follows, Group I: IPS e.max CAD and Group II: Vita Enamic. Each group was further subdivided into two subgroups (n=9) according to the acidic beverage used, either Coffee, or Coca-Cola. Samples were immersed in acidic beverage solutions for three weeks, after which all samples were subjected to measure the translucency parameter using a Reflective Spectrophotometer and then using Vickers Micro-Hardness Tester to measure surface microhardness and fracture toughness. Statistical analysis was performed using one-way analysis of variance followed by Tukey's posthoc test if showed significance. Student t-test was done between main groups, while Two-way ANOVA compared the effect of each factor.Results: There was a statistically significant difference between IPS e.max CAD and Vita Enamic regarding translucency. Significant difference in surface microhardness, and fracture toughness after immersion in two acidic beverage solutions was revealed.Conclusions: Acidic beverages can adversely affect the translucency of glass-ceramic and hybrid ceramic materials. Microhardness and fracture toughness of different CAD/CAM esthetic materials was negatively affected secondary to exposure to beverages with low pH values.

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Section: Introductionmentioning

confidence: 99%

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Sami

2023

Egyptian Dental Journal

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Effect of sintering speed, aging processes, and different surface treatments on the optical and surface properties of monolithic zirconia restorations

Hafezeqoran

Sabanik²,

Koodaryan

et al. 2023

The Journal of Prosthetic Dentistry

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The effect of speed sintering on the optical properties and microstructure of multi‐layered cubic zirconia

Hassan Shohdy,

Sabet,

Sherif

et al. 2024

Journal of Prosthodontics

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PurposeSpeed sintering was introduced to fabricate time‐efficient chairside restorations, however, its influence on the microstructure and optical properties of zirconia is still unclear. This study investigated the influence of speed sintering on the microstructure and optical properties of ultra‐translucent multi‐layered cubic zirconia.Materials and methodsUltra‐translucent cubic zirconia (Katana™ UTML; Kuraray Noritake Dental Inc., Aichi, Japan) was cut into a total of 80 specimens, twenty within each layer of the blank. The specimens were divided into 2 groups: speed and conventional sintering. The translucency parameter, opalescence, chromaticity, and color difference were recorded using a spectrophotometer. Scanning electron microscope images were used for crystallographic analysis. One‐way ANOVA and Tukey's post‐hoc test (p < 0.05) were used for data analysis.ResultsSpeed sintering significantly reduced the translucency and opalescence compared to conventional sintering excluding the opalescence of the dentin layer. Chromaticity significantly decreased with speed sintering in less chromatic layers and significantly increased in more chromatic layers. Mean color change ranged between 0.65 and 1.25 across different layers. Mean crystal size decreased with speed sintering.ConclusionsWith speed sintering, translucency, and opalescence decrease while chromaticity increases in the more chromatic layers. Additionally, no clinically perceptible color change was found compared to conventional sintering.

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Translucency and Biaxial Flexural Strength of Monolithic Zirconia as Affected by Sintering Speeds

Cited by 3 publications

References 39 publications

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Translucency, Microhardness and Fracture Toughness of Two Machinable Ceramics as Affected by Two Acidic Beverages

Effect of sintering speed, aging processes, and different surface treatments on the optical and surface properties of monolithic zirconia restorations

The effect of speed sintering on the optical properties and microstructure of multi‐layered cubic zirconia

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