Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China.
Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China.
Biomed Res Int. 2021 Jan 25;2021:8875023. doi: 10.1155/2021/8875023. eCollection 2021.
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.
The aim of this systematic review and meta-analysis of studies was to evaluate the effects of aging on the color and translucency of monolithic translucent Y-TZP ceramics.
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. 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.
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 ( = .73, = .49, and = .62, respectively). Moreover, there was a significant difference between the aged and nonaged Y-TZP ceramics in the a value ( = .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.
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.
由半透明氧化钇稳定四方氧化锆多晶（Y-TZP）制成的整体修复体在过去几十年中变得越来越流行。然而，老化是否会影响整体半透明 Y-TZP 的颜色和半透明度尚不清楚。
本系统评价和荟萃分析研究的目的是评估老化对整体半透明 Y-TZP 陶瓷颜色和半透明度的影响。
本系统评价/荟萃分析根据 PRISMA 声明进行报告，并在 OSF 注册处（https://osf.io/5qjmu）进行了注册。使用无发表年份和语言限制，通过 Medline 下的 PubMed、Embase 和 Web of Science 数据库以及 Cochrane 图书馆对四个数据库进行了搜索。最后一次搜索于 2020 年 11 月 20 日进行。选择了比较模拟老化前后整体半透明 Y-TZP 陶瓷半透明度和/或颜色的研究。使用 Review Manager 软件（版本 5.3，Cochrane 协作，英国牛津）进行荟萃分析，采用随机效应模型，显著性水平为 0.05。还对纳入的研究进行了风险偏倚评估。
在 188 篇潜在相关研究中，有 13 篇被纳入系统评价。水热老化时间从 1 小时到 100 小时不等，温度相对相似（~134°C）。在一般荟萃分析中，与非老化对照相比，老化的 Y-TZP 陶瓷表现出相似的半透明度参数（TP）、L 和 b 值（ =.73， =.49， =.62）。此外，在 a 值方面，老化和非老化 Y-TZP 陶瓷之间存在显著差异（ =.03；MD = -0.26；95%CI = -0.51 至 - 0.02），非老化 Y-TZP 陶瓷更具优势。亚组分析表明，老化时间会导致 Y-TZP 陶瓷的半透明度和颜色发生变化。
在 134°C 和 0.2 MPa 下老化≤20 小时后，整体半透明 Y-TZP 陶瓷的光学性能稳定。此外，在水热老化>20 小时后，发现整体半透明 Y-TZP 陶瓷的半透明度和颜色发生了不可接受的临床变化。
