The influence of colored zirconia on the optical properties of all-ceramic restorations

Harada, Rino; Takemoto, Shinji; Hattori, Masayuki; Yoshinari, Masao; Oda, Yutaka; Kawada, Eiji

doi:10.4012/dmj.2015-171

Cited by 21 publications

(25 citation statements)

References 31 publications

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“…Initially, a zirconia ceramic with proper translucency and strength should be chosen, and therefore, clinicians and technicians should have the relevant knowledge. Although substructure design for veneered zirconia restorations affects color and translucency, restoration design for monolithic structures is not crucial in this respect. Indeed, the monolithic restoration design is affected by factors such as the amount of tooth reduction and the tooth full‐contour outline …”

Section: Laboratory Proceduresmentioning

confidence: 99%

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Tabatabaian

2018

Journal of Prosthodontics

137

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Monolithic zirconia restoration is an acceptable treatment option in restorative dentistry and a developing trend in esthetic dentistry. Digital dentistry has simplified fabrication of monolithic zirconia restorations. Zirconia ceramic has introduced an opportunity to achieve both esthetic and mechanical requirements for restorations. This is rarely found for a ceramic in dentistry. Monolithic zirconia restorations represent an acceptable durability, comparable to metal-ceramic restorations, while they are superior to metal-ceramic restorations esthetically; however, difficulties to gain an optimal shade reproduction and a color match with monolithic zirconia restorations still remain. The color of these restorations may be influenced by manufacturing processes, laboratory procedures, and clinical factors. Manufacturing processes determine basic optical properties of zirconia ceramics. Different laboratory procedures may create optical changes in zirconia ceramics. Also clinical factors such as dental background, cement, and zirconia restoration features may affect the resulting color. This literature review aimed to discuss potent factors in the color of monolithic zirconia restorations. An electronic search of the PubMed/Google Scholar database was performed to find related English-language articles published between January 1, 2000, and October 31, 2017. The key terms of background, cement, ceramic, color, esthetics, shade, spectrophotometry, thickness, translucency, and zirconia were used both individually and simultaneously. Also, a manual search was conducted, and five classic articles of color science were added. Thus 192 articles were included. In the last decade, shade reproduction of monolithic zirconia restorations has been highly regarded; however, further improvements are required in the manufacturing process to produce tooth-like zirconia ceramics. An esthetic guideline named background-cement-ceramic color harmony was suggested in this study; however, more clinical practice guidelines should be established for monolithic zirconia restorations on esthetics, and therefore, more studies are required.

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Section: Laboratory Proceduresmentioning

confidence: 99%

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Tabatabaian

2018

Journal of Prosthodontics

137

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“…To obtain the desired esthetic appearance of the restoration, it is essential to select, according to clinical situation, the most suitable dental ceramic, its appropriate shade and translucency, considering also its mechanical properties …”

Section: Introductionmentioning

confidence: 99%

“…2,3 To obtain the desired esthetic appearance of the restoration, it is essential to select, according to clinical situation, the most suitable dental ceramic, its appropriate shade and translucency, considering also its mechanical properties. [4][5][6][7] Computer-aided design (CAD) and computer-aided manufacturing (CAM) systems have gained popularity in modern restorative dentistry. 8 Among the most newly introduced materials for CAD-CAM technology, monolithic zirconia, zirconia-containing lithium silicate ceramics, and interpenetrating phase composites are likely to lead to further developments and to enlarge the area of indications for all ceramic restoration.…”

Section: Introductionmentioning

confidence: 99%

Effect of glazing on translucency, color, and surface roughness of monolithic zirconia materials

Manziuc

Gasparik

Burde

et al. 2019

J Esthet Restor Dent

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Objectives To assess the effect of material, thickness and glazing upon the color, translucency, and roughness of monolithic zirconia. Materials and methods Sixty discs (0.8, 1.5, and 2 mm thickness) were fabricated from A1 translucent zirconia (IPS e.max ZirCAD/MT, Katana/HT, Vita YZ/HT, Cercon/HT) and glazed. Roughness (Ra) was assessed with a profilometer and color coordinates were measured with a spectrophotometer on a black, white, and tooth‐shaded background before and after glazing. Relative translucency parameter (RTP), color differences (CIEDE2000) and differences in translucencies between materials, before and after glazing were calculated. RTP, Ra, color differences were statistically analyzed using ANOVA. Any significant interaction between factors was further analyzed using Tukey's HSD. Results RTP values were significantly different between materials (P < .001) and thicknesses (P < .001), with the interaction effect between material type and thickness, also significant (P < .001). However, glazing did not have a significant effect on RTP values (P = .782). Color differences resulted after glazing were significantly different between materials (P < .001), and thicknesses (P < .001) with the interaction effect also significant (P < .001). Glazing influenced roughness, Ra decreasing for all materials (P < .001). Conclusions As a result of glazing, only color changes were statistically significant. Translucency varied among brands of precolored monolithic zirconia; the differences increased for greater thicknesses. Clinical significance Glazing is an important step in the technological process of ceramic restorations; however, it can influence the final optical appearance of the restoration as color changes could be expected after the application of the glaze.

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“…13,14 Colored zirconia framework has been introduced, developed through staining or infiltrating chloride solution of rare earth elements before sintering, to mask the opaque appearance and whiteness of zirconia frameworks. 15 However, little information is available on optical aspects of colored zirconia, and it appears that using colored frameworks does not offer any direct advantages over the standard natural zirconia frameworks. 15,16 Furthermore, it has been reported that the veneering ceramic is what modifies the final color of ceramic restorations.…”

mentioning

confidence: 99%

“…15,16 Furthermore, it has been reported that the veneering ceramic is what modifies the final color of ceramic restorations. 15 In addition, colored zirconia framework does not solve the chipping of the veneering porcelain, and to overcome this problem monolithic zirconia has been introduced to the market, 10,17 However, due to its recent introduction, studies regarding its behavior are limited. 10 Ceramic restorations are subjected to masticatory forces in a wet environment, and several factors, including masticatory forces, temperature, and moisture, can affect their mechanical properties and load to fracture.…”

mentioning

confidence: 99%

Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

López-Suárez

Tobar

Solá-Ruíz

et al. 2019

Journal of Prosthodontics

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Purpose To evaluate the influence of static (not preloaded) and thermomechanical loading on the load to fracture of metal‐ceramic, monolithic and veneered zirconia computer‐aided design/computer‐aided manufacturing (CAD/CAM) posterior fixed partial dentures (FPDs). Materials and Methods One hundred standardized specimens with 2 abutments screwed onto a platform were prepared from stainless steel to receive a posterior 3‐unit FPD with an intermediate pontic. Specimens were randomly divided into 5 groups (n = 20): Metal‐ceramic (control group), Lava Zirconia system, Vita In‐Ceram YZ, IPS e.max ZirCAD, and Lava Plus. Half of the specimens of each group (n = 10) underwent no preloading, and the other half were subjected to thermomechanical loading in a masticatory simulator, and then all FPDs were loaded until fracture using a universal testing machine at a 1 mm/min crosshead speed. The load to fracture of the veneering ceramic and the load to fracture of framework (total fracture) were recorded for each specimen. Data were statistically analyzed using 2‐way ANOVA, Tukey's HSD post‐hoc test, Student's t test, and Weibull statistics, α = 0.05. Results Significant differences were recorded between the metal‐ceramic and veneered zirconia groups for the veneering ceramic load (p < 0.001; f = 36.62; f = 57.76) in no preloading and thermomechanical loading subgroups, respectively, but no differences were observed between the static and thermomechanical loading conditions. No differences were observed among the veneered zirconia groups. For the total load to fracture, significant differences were observed according to the material (p < 0.001; f = 500.8), between the metal‐ceramic and Lava Plus group and the other zirconia groups in no preloading subgroup, and between metal‐ceramic and the other groups (p < 0.001; f = 303.33) in thermomechanical loading subgroup. For the type of preloading, significant differences were observed (p = 0.02; f = 5.24) between the Lava Plus group and the other groups. Thermomechanical loading significantly decreased the fracture load of the Lava Plus group (p = 0.005). The Weibull statistics corroborated the results. Conclusions Monolithic zirconia restorations provided the highest load to fracture values among the zirconia groups tested; however, the results indicate that they must be used in the oral environment with caution, because their load to fracture was influenced by the aging simulation.

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The influence of colored zirconia on the optical properties of all-ceramic restorations

Cited by 21 publications

References 31 publications

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Color Aspect of Monolithic Zirconia Restorations: A Review of the Literature

Effect of glazing on translucency, color, and surface roughness of monolithic zirconia materials

Effect of Thermomechanical and Static Loading on the Load to Fracture of Metal‐Ceramic, Monolithic, and Veneered Zirconia Posterior Fixed Partial Dentures

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