Effects of Aging on the Color and Translucency of Monolithic Translucent Y-TZP Ceramics: A Systematic Review and Meta-Analysis of In Vitro Studies

Abstract

Background. Monolithic restorations made of translucent yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) have become popular over the past few decades. However, whether aging affects the color and translucency of monolithic translucent Y-TZP is unclear. Objective. The aim of this systematic review and meta-analysis of in vitro studies was to evaluate the effects of aging on the color and translucency of monolithic translucent Y-TZP ceramics. Materials and Methods. This systematic review/meta-analysis was reported according to the PRISMA statement and registered in the OSF registries (https://osf.io/5qjmu). Four databases including Medline via the PubMed, Embase, and Web of Science databases and the Cochrane Library were searched using no publication year and language limits. The last search was executed on November 20, 2020. In vitro studies comparing the translucency and/or color of monolithic translucent Y-TZP ceramics before and after simulated aging were selected. Meta-analyses were performed using Review Manager software (version 5.3, Cochrane Collaboration, Oxford, UK) with random-effects models at a significance level of 0.05. A risk-of-bias assessment was also performed for the included studies. Results. Of the 188 potentially relevant studies, 13 were included in the systematic review. The hydrothermal aging duration ranged from 1 to 100 h at relatively similar temperatures (~134°C). In the general meta-analyses, the aged Y-TZP ceramics exhibited similar translucency parameter (TP), L ∗ , and b ∗ values compared with the nonaged controls ( P = .73 , P = .49 , and P = .62 , respectively). Moreover, there was a significant difference between the aged and nonaged Y-TZP ceramics in the a ∗ value ( P = .03 ; MD = − 0.26 ; 95% CI = − 0.51 to − 0.02 ), favoring the nonaged Y-TZP ceramics. The subgroup analyses showed that the duration of aging contributed to changes in the translucency and color of the Y-TZP ceramics. Conclusions. The optical properties of monolithic translucent Y-TZP ceramics were stable after hydrothermal aging at 134°C and 0.2 MPa for ≤20 h. Moreover, clinically unacceptable changes in the translucency and color of monolithic translucent Y-TZP ceramics were found after hydrothermal aging for >20 h.

Color Stability of Nano hybrid Composite and Acrylic Denture Teeth Exposed to Different Coloring Solutions

“…According to our results, acrylic denture teeth exhibited less color stability than composite artificial teeth. This result was in agreement with previous studies reported by Satoh et al (15) Mutlu-Sagesen et al (19) , and Belli et al (21) . This could be related to sorption character of the water by acrylic materials.…”

“…Evaluation of color changes can be performed by visual or instrumental methods. Spectrophotometers are used in preference to visual evaluation as this instrumental assessment remove the subjective reading of visual color comparison (15) . Characterization of color changes was performed by the Commission Internationale d' Eclairage L*a*b* color space (CIE L*a*b*).…”

Effect of Different Shading Techniques on the Color of Zirconia Ceramic Restoration (An In vivo Study)

“…1>E>3.7 was the difference, which is regarded clinically acceptable. Our findings matched those of (hang-yuan Zhang et al, 2021, who investigated the effect of aging on the color and translucency of monolithic zirconia and determined that color change after aging was within the clinically acceptable range [40].…”

Additively Manufactured Zirconia for Dental Applications

“…Moreover, EDS revealed that the subtractively manufactured zirconia (LAVA Plus, 3M Oral Care) had a lower Al 2 O 3 content than the additively manufactured 3Y-TZPs (LithaCon 3Y 230, Lithoz; 3D Mix zirconia, 3DCeram Sinto), which is in line with their overall composition. LAVA Plus (3M Oral Care) is categorized as a highly translucent 3Y-TZP (0.05 wt% Al 2 O 3 ) that contains less Al 2 O 3 than a conventional 3Y-TZP (0.25 wt% Al 2 O 3 ) [32].…”