Influence of Accelerated Aging on the Color Stability of Dental Zirconia

Volpato, Cláudıa Ângela Mazıero; César, Paulo Francisco; Bottıno, Marco Antônıo

doi:10.1111/jerd.12239

Cited by 39 publications

(24 citation statements)

References 40 publications

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“…The monolithic zirconia, without an overlaying ceramic veneer, is directly exposed to the water and body fluids. The water exposure at 37 °C leads to low-temperature degradation (LTD) by phase transformation from a tetragonal to a monoclinic structure [32,33]. Phase transformation to monoclinic led to a 4% increase in volume; consequently results in structural disintegration, surface roughness and the development of micro-cracks [34].…”

Section: Discussionmentioning

confidence: 99%

Effect of Hydrothermal Aging and Beverages on Color Stability of Lithium Disilicate and Zirconia Based Ceramics

2019

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Background and Objectives: All-ceramic prosthesis is widely used in modern dental practice because of its improved physico-mechanical and optical properties. These restorations are exposed to coloring agents from various nutrition and beverages in the oral cavity. Long-term color stability is critical for the success of these restorative materials. The purpose of this in vitro study was to assess the effect of common beverages and mouthwash on the color stability of lithium disilicate (LD), monolithic zirconia (MZ) and bilayer zirconia (BZ) surfaces. Materials and Method: Thirty disc-shaped specimens from each material were fabricated; each group was subdivided (n = 10) according to coffee, green tea and chlorhexidine immersion solutions. The baseline color of ceramic discs was recorded according to the CIE L*a*b* system with a portable spectrophotometer. The second measurement was recorded after 3000 thermocycling and immersion in coloring agents for 7 days. The mean color difference was calculated and data were compared with Kruskal-Wallis and Mann-Whitney post hoc tests (0.05). Results: ΔE values for LD with the immersion of coffee, tea, and Chlorhexidine gluconate (CHG) were 1.78, 2.241 and 1.58, respectively. Corresponding ΔE values for MZ were 5.60, 5.19, and 4.86; marginally higher than the clinically acceptable level of 3.5. Meanwhile, BZ showed better color stability compared to MZ with ΔE values of 4.22, 2.11 and 1.43. Conclusions: Among the ceramics evaluated, LD ceramic was found to be more color stable, while MZ ceramics displayed a higher susceptibility to discoloration. MZ and BZ ceramic colors were significantly altered with coffee immersion, while LD ceramics were more affected by green tea.

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Section: Discussionmentioning

confidence: 99%

Effect of Hydrothermal Aging and Beverages on Color Stability of Lithium Disilicate and Zirconia Based Ceramics

2019

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“…Maintaining the optical properties of an esthetic restoration for a long‐time of its usage is also essential for its clinical success. It has been reported that after aging, discrete color changes can occur in resin, ceramic, or zirconia, particularly when it is contact with the oral environment …”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have searched the color stability of CAD‐CAM materials and reported that polymer composites undergo clinically perceptible color change in staining solutions. Unlike glass ceramics, ceramic‐polymer materials contain a polymer component, exhibited higher color change in staining solution than lithium disilicate .…”

Section: Discussionmentioning

confidence: 99%

Effect of UV aging on translucency of currently used esthetic CAD‐CAM materials

Turğut

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2019

J Esthet Restor Dent

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Objectives: To evaluate the relative translucency parameter (RTP) values of computer-aided design (CAD)-computer-aided manufacturing (CAM) materials after UV aging.Materials and methods: 70 specimens (n = 10) of Bruxzir Anterior (BA); E.max Cad (EC); Lava Ultimate (LU); Cerasmart (CE); Vita Enamic (VE); Vita Suprinity (VS); Vita Mark II (VM) were prepared (1 mm ± 0.01 mm). Color measurements were performed using a spectrofotometer (VITA Easyshade). RTP values of the specimens before (RTP 1 ) and after UV aging (RTP 2 ) were evaluated. Statistical analyses were done with repeated measurements of two-way-ANOVA with Bonferroni test (P < 0.05).Results: Evaluating RTP 1 and RTP 2 values; significant differences were found (P < 0.05). There were no significant difference between the RTP 1 values of CE and VS (P = 0.779); EC and VM (P = 0.952); VM and LU (P = 0.995); EP and LU (P = 0.653). Evaluating RTP 2 values; VE and BA were found significantly different from the others (P < 0.05). For all evaluated groups TP values decreased after UV aging (P < 0.05). The most RTP reduction was observed for LU; while VM and EC were less affected.Conclusion: Glass ceramic VE showed the highest RTP and zirconia-based BA was the most opaque restorative CAD-CAM material. UV aging caused the CAD-CAM materials get more opaque.Clinical significance: In cases where translucency is needed chosing VE would give better esthetic results; while zirconia-based BA should be used if more opaque restoration is needed.Clinicians should be aware of that restorations get more opaque after usage. K E Y W O R D S

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“…Achieving optimal esthetic outcomes with zirconia‐based restorations is still challenging due to multiple factors that affect the final color, such as fabrication techniques or aging . Recent studies have reported that zirconia submitted to accelerated aging also showed optical differences …”

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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Influence of Accelerated Aging on the Color Stability of Dental Zirconia

Cited by 39 publications

References 40 publications

Effect of Hydrothermal Aging and Beverages on Color Stability of Lithium Disilicate and Zirconia Based Ceramics

Effect of Hydrothermal Aging and Beverages on Color Stability of Lithium Disilicate and Zirconia Based Ceramics

Effect of UV aging on translucency of currently used esthetic CAD‐CAM materials

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

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