Postgraduate student, 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, PR China.
Professor, Division for Globalization Initiative, Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
J Prosthet Dent. 2021 Feb;125(2):222-230. doi: 10.1016/j.prosdent.2020.01.005. Epub 2020 Feb 28.
A wide range of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics have been applied for dental restorations. However, whether hydrothermal aging affects the surface roughness of Y-TZP is unknown.
The purpose of this systematic review and meta-analysis was to evaluate the effects of low-temperature degradation (LTD) on the surface roughness of Y-TZP ceramics.
This report follows the Preferred Reporting Items for Systematic Reviews and Qualitative Analyses statement. The literature search was conducted with Medline through the PubMed, Web of Science, and Cochrane Library with no publication year limits. The screening and quality assessment were performed by 2 independent reviewers. The studies comparing the surface roughness of Y-TZP ceramics after LTD by using steam autoclave aging were included in the meta-analysis. Meta-analyses were conducted with a random-effects model (α=.05) by using Review Manager Software (Cochrane Collaboration).
Of the 203 potentially relevant studies, 32 full texts were assessed for eligibility. A total of 17 articles were included in the systematic review, and 15 were included in the qualitative analyses. The results showed no significant difference in the arithmetic average height (R) values between the nonaged and aged Y-TZP (P=.670; mean difference=0.01; 95% confidence interval=-0.03 to 0.05). Subgroup analyses revealed that the aging duration (P=.003) and specimen preparation (P=.010) contributed significantly to the changes in the surface roughness of the Y-TZP ceramics.
Although LTD was found to have no significant effects on the surface roughness of Y-TZP ceramics, the effects of LTD depended on the duration of the steam autoclave process and the specimen preparation.
广泛使用的氧化钇稳定四方氧化锆多晶（Y-TZP）陶瓷已被应用于牙科修复体。然而，水热老化是否会影响 Y-TZP 的表面粗糙度尚不清楚。
本系统评价和荟萃分析的目的是评估低温降解（LTD）对 Y-TZP 陶瓷表面粗糙度的影响。
本报告遵循系统评价和定性分析的首选报告项目声明。文献检索通过 Medline 在 PubMed、Web of Science 和 Cochrane Library 中进行，无出版年限限制。通过 2 位独立审稿人进行筛选和质量评估。纳入比较经蒸汽高压釜老化 LTD 后 Y-TZP 陶瓷表面粗糙度的研究进行荟萃分析。使用 Review Manager 软件（Cochrane 协作网）采用随机效应模型（α=.05）进行荟萃分析。
在 203 篇潜在相关研究中，有 32 篇全文进行了合格性评估。共有 17 篇文章纳入系统评价，15 篇纳入定性分析。结果显示，未老化和老化的 Y-TZP 的算术平均高度（R）值之间无显著差异（P=.670；平均差值=0.01；95%置信区间=-0.03 至 0.05）。亚组分析表明，老化时间（P=.003）和样本制备（P=.010）对 Y-TZP 陶瓷表面粗糙度的变化有显著影响。
尽管 LTD 被发现对 Y-TZP 陶瓷的表面粗糙度没有显著影响，但 LTD 的影响取决于蒸汽高压釜处理的持续时间和样本制备。
