Effects of fabrication and shading technique on the color and translucency of new-generation translucent zirconia after coffee thermocycling

Subaşı, Meryem Gülce; Alp, Gülce; Johnston, William M.; Yılmaz, Burak

doi:10.1016/j.prosdent.2018.01.018

Cited by 32 publications

(28 citation statements)

References 26 publications

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“…It helps the researcher save time by detecting the amount of material degradation in the thermal cycle within a shorter period of time, while the researcher gains information about the material. [27][28][29][30] In this in vitro study, three different CAD/CAM material samples were compared in terms of color stability. The last stage, i.e.…”

Section: Discussionmentioning

confidence: 99%

Effect of surface finishing treatments on the color stability of CAD/CAM materials

2020

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The aim of this study was to evaluate the effect of different surface finishing processes on the color stabilities of lithium disilicate glass-ceramics, zirconia-reinforced lithium silicate ceramics, and resin nanoceramics after artificial ageing. MATERIALS AND METHODS. 216 samples were prepared from 3 different CAD/CAM materials (LAVA Ultimate, IPS e.max CAD, VITA Suprinity) with A1 HT color at a size of 14 × 12 mm and a thickness of 0.5 ± 0.05 mm. Color measurements of the samples were performed with a spectrophotometer using color parameters and CIE Lab color system on a gray backing between baseline color and after 5000 cycles of artificial ageing in 4 stages (i.e. the first measurement before the treatment, the second measurement after polishing, the third measurement after cement application, and the fourth measurement after artificial ageing). The results were evaluated using the Variance analysis and Fisher's LSD test. RESULTS. Resin nanoceramics (LU) exhibited higher color change values than zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) ceramics after artificial ageing. Manual polishing and glazing resulted in similar color change for LU and VS (P>.05). In the EC group, glazing provided statistically different results as compared to the manual polishing and control groups (P<.05). Among the ceramic groups, color change values of the subgroup, which was treated by glazing, of the zirconia-reinforced lithium silicate (VS) and lithium disilicate (EC) samples were below the clinically acceptable level (ΔE < 3.5). CONCLUSION. The lowest color change for all stages was observed in Vita Suprinity.

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Section: Discussionmentioning

confidence: 99%

Effect of surface finishing treatments on the color stability of CAD/CAM materials

2020

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“…After baseline measurements for optical and roughness parameters, the samples were aged for 10,000 thermocycles in distilled water. Samples were subjected to 10,000 cycles to estimate ten years of oral conditions [26].…”

Section: Artificial Ageing Of the Samples By Thermocyclingmentioning

confidence: 99%

“…Thermocycling is a popular method of artificial accelerated aging of ceramics because it reproduces the oral environment as an extrinsic factor [24][25][26]. The water aging method includes standardized thermal variations with baths ranging from 5 to 55 • C for several cycles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

2020

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Dental ceramic restorations are widely spread nowadays due to their aesthetics and biocompatibility. In time, the colour and structure of these ceramic materials can be altered by aging processes. How does artificial aging affect the optical and surface roughness of ceramics? This study aims to assess the effect of thermocycling, surface treatments and microstructure upon translucency, opalescence and surface roughness on CAD-CAM and heat-pressed glass-ceramic. Forty-eight samples (1.5 mm thickness) were fabricated from six types of A2 MT ceramic: heat-pressed and milled glass-ceramic (feldspathic, lithium disilicate and zirconia reinforced lithium silicate). The samples were obtained respecting the manufacturer’s instructions. The resulted surfaces (n = 96) were half glazed and half polished. The samples were subjected to thermocycling (10,000 cycles) and roughness values (Ra and Rz), colour coordinates (L*, a*, b*) and microstructural analyses were assessed before and after thermocycling. Translucency (TP) and opalescence (OP) were calculated. Values were statistically analysed using ANOVA test (one way). TP and OP values were significantly different between heat-pressed and milled ceramics before and also after thermocycling (p < 0.001). Surface treatments (glazing and polishing) had a significant effect on TP and OP and surface roughness (p < 0.05). The heat-pressed and milled zirconia reinforced lithium silicate glass-ceramic experienced a loss in TP and OP. Ra and Rz increased for the glazed samples, TP and OP decreased for all the samples after thermocycling. Microstructural analyse revealed that glazed surfaces were more affected by the thermocycling and especially for the zirconia reinforced lithium silicate ceramic. Optical properties and surface roughness of the chosen ceramic materials were affected by thermocycling, surface treatments and microstructural differences. The least affected of the ceramics was the lithium disilicate ceramic heat-pressed polished and glazed.

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“…Two types of zirconia restorations are available, monolithic or full‐contour zirconia and zirconia‐based restorations . Several veneering techniques have been introduced, such as the traditional layering veneering technique (LV), the overpressing technique (OP), the file‐splitting technique, and the cutback (CB) technique . Using LV, the mixed ceramic powder and its liquid are directly applied on the sintered zirconia core.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of currently used zirconia‐based esthetic restorations fabricated with different techniques

Turğut

2019

J Esthet Restor Dent

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Objective: The aim was to evaluate the effects of different types of monolithic zirconia (MZ) and fabrication techniques on the optical properties of newly generated zirconia-based materials after aging.Material and Methods: Sixty specimens (n = 10) were prepared. For the groups layering-veneering (LV), overpressing (OP), porcelain fused to zirconia (PFZ), and cutback (CB), 3Y-TZP, IPS e.max ZirCAD was prepared as the core material (0.5 ± 0.01 mm). For full-contour (FC) technique, 3Y-TZP was used for MZ-LT (low translucency) and 4Y-TZP was used for MZ-MT (medium translucency). L*, a*, b*, chroma (C), and relative translucency (RTP) were measured before () UV aging. Statistical analyses were performed by one-way ANOVA with Tukey's test and paired sample t tests (P = .05).Results: Fabrication techniques significantly affected the L*, a*, b*, C, RTP, and ΔE 00 values (P ˂ .01). The highest L 1 * value was found in MZ-LT; followed, in order, by OP, PFZ, LV, CB, and MZ-MT. The highest b 1 * and C 1 values were found in OP, while MZ-MT had the lowest values (P ˂ .05). FC had the highest RTP values for MZ-MT (13 ± 0.9 RTP 1; 11.2 ± 0.9 RTP 2 ), and the lowest RTP values were found for MZ-LT (8.5 ± 0.9 RTP 1; 8.3 ± 1.2 RTP 2 ) (P ˂ .01). Aging caused significant differences in the L*, a*, b*, C, and RTP values (P < .05). The color changes were between 0.9 and 2.1 ΔE 00 . Conclusions:The fabrication technique significantly affected the optical properties.UV aging caused zirconia-based restorations to become darker and more yellow, red, saturated, and opaque.Clinical Implications: Fabrication techniques with different zirconia structures affected the optical properties of the restoration, even when the same shades were chosen. If more translucent restorations are needed, choosing 4-YTZP with the FC technique is better than veneering with 3-YTZP. Choosing 3-YTZP with the FC technique produces more esthetic results if brighter and more opaque restorations are needed.

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Effects of fabrication and shading technique on the color and translucency of new-generation translucent zirconia after coffee thermocycling

Cited by 32 publications

References 26 publications

Effect of surface finishing treatments on the color stability of CAD/CAM materials

Effect of surface finishing treatments on the color stability of CAD/CAM materials

Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

Optical properties of currently used zirconia‐based esthetic restorations fabricated with different techniques

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